diff --git a/src/Makefile.am b/src/Makefile.am
index c7b193daafd..36b91027127 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -137,6 +137,7 @@ BITCOIN_CORE_H = \
   common/bloom.h \
   common/init.h \
   common/run_command.h \
+  common/types.h \
   common/url.h \
   compat/assumptions.h \
   compat/byteswap.h \
diff --git a/src/common/types.h b/src/common/types.h
new file mode 100644
index 00000000000..0d9cb67ce94
--- /dev/null
+++ b/src/common/types.h
@@ -0,0 +1,26 @@
+// Copyright (c) 2010-2021 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+//! @file common/types.h is a home for simple enum and struct type definitions
+//! that can be used internally by functions in the libbitcoin_common library,
+//! but also used externally by node, wallet, and GUI code.
+//!
+//! This file is intended to define only simple types that do not have external
+//! dependencies. More complicated types should be defined in dedicated header
+//! files.
+
+#ifndef BITCOIN_COMMON_TYPES_H
+#define BITCOIN_COMMON_TYPES_H
+
+namespace common {
+enum class PSBTError {
+    MISSING_INPUTS,
+    SIGHASH_MISMATCH,
+    EXTERNAL_SIGNER_NOT_FOUND,
+    EXTERNAL_SIGNER_FAILED,
+    UNSUPPORTED,
+};
+} // namespace common
+
+#endif // BITCOIN_COMMON_TYPES_H
diff --git a/src/interfaces/wallet.h b/src/interfaces/wallet.h
index f1bfffa7d46..1c916aacb0a 100644
--- a/src/interfaces/wallet.h
+++ b/src/interfaces/wallet.h
@@ -30,9 +30,11 @@ class CFeeRate;
 class CKey;
 enum class FeeReason;
 enum class OutputType;
-enum class TransactionError;
 struct PartiallySignedTransaction;
 struct bilingual_str;
+namespace common {
+enum class PSBTError;
+} // namespace common
 namespace wallet {
 class CCoinControl;
 class CWallet;
@@ -202,7 +204,7 @@ public:
         int& num_blocks) = 0;
 
     //! Fill PSBT.
-    virtual TransactionError fillPSBT(int sighash_type,
+    virtual std::optional<common::PSBTError> fillPSBT(int sighash_type,
         bool sign,
         bool bip32derivs,
         size_t* n_signed,
diff --git a/src/node/types.h b/src/node/types.h
index 7febc45a2b4..9dd2edebb53 100644
--- a/src/node/types.h
+++ b/src/node/types.h
@@ -17,16 +17,10 @@ enum class TransactionError {
     OK, //!< No error
     MISSING_INPUTS,
     ALREADY_IN_CHAIN,
-    P2P_DISABLED,
     MEMPOOL_REJECTED,
     MEMPOOL_ERROR,
-    INVALID_PSBT,
-    PSBT_MISMATCH,
-    SIGHASH_MISMATCH,
     MAX_FEE_EXCEEDED,
     MAX_BURN_EXCEEDED,
-    EXTERNAL_SIGNER_NOT_FOUND,
-    EXTERNAL_SIGNER_FAILED,
     INVALID_PACKAGE,
 };
 
diff --git a/src/psbt.cpp b/src/psbt.cpp
index b2ee3ce7a5e..9e59b52b41d 100644
--- a/src/psbt.cpp
+++ b/src/psbt.cpp
@@ -508,17 +508,17 @@ bool FinalizeAndExtractPSBT(PartiallySignedTransaction& psbtx, CMutableTransacti
     return true;
 }
 
-TransactionError CombinePSBTs(PartiallySignedTransaction& out, const std::vector<PartiallySignedTransaction>& psbtxs)
+bool CombinePSBTs(PartiallySignedTransaction& out, const std::vector<PartiallySignedTransaction>& psbtxs)
 {
     out = psbtxs[0]; // Copy the first one
 
     // Merge
     for (auto it = std::next(psbtxs.begin()); it != psbtxs.end(); ++it) {
         if (!out.Merge(*it)) {
-            return TransactionError::PSBT_MISMATCH;
+            return false;
         }
     }
-    return TransactionError::OK;
+    return true;
 }
 
 std::string PSBTRoleName(PSBTRole role) {
diff --git a/src/psbt.h b/src/psbt.h
index 3f740837170..95f6fdf91a7 100644
--- a/src/psbt.h
+++ b/src/psbt.h
@@ -1263,9 +1263,9 @@ bool FinalizeAndExtractPSBT(PartiallySignedTransaction& psbtx, CMutableTransacti
  *
  * @param[out] out   the combined PSBT, if successful
  * @param[in]  psbtxs the PSBTs to combine
- * @return error (OK if we successfully combined the transactions, other error if they were not compatible)
+ * @return True if we successfully combined the transactions, false if they were not compatible
  */
-[[nodiscard]] TransactionError CombinePSBTs(PartiallySignedTransaction& out, const std::vector<PartiallySignedTransaction>& psbtxs);
+[[nodiscard]] bool CombinePSBTs(PartiallySignedTransaction& out, const std::vector<PartiallySignedTransaction>& psbtxs);
 
 //! Decode a base64ed PSBT into a PartiallySignedTransaction
 [[nodiscard]] bool DecodeBase64PSBT(PartiallySignedTransaction& decoded_psbt, const std::string& base64_psbt, std::string& error);
diff --git a/src/qt/psbtoperationsdialog.cpp b/src/qt/psbtoperationsdialog.cpp
index 353709c7f5d..7bbebec46c7 100644
--- a/src/qt/psbtoperationsdialog.cpp
+++ b/src/qt/psbtoperationsdialog.cpp
@@ -13,6 +13,7 @@
 #include <qt/forms/ui_psbtoperationsdialog.h>
 #include <qt/guiutil.h>
 #include <qt/optionsmodel.h>
+#include <util/error.h>
 #include <util/fs.h>
 #include <util/strencodings.h>
 
@@ -55,10 +56,10 @@ void PSBTOperationsDialog::openWithPSBT(PartiallySignedTransaction psbtx)
     bool complete = FinalizePSBT(psbtx); // Make sure all existing signatures are fully combined before checking for completeness.
     if (m_wallet_model) {
         size_t n_could_sign;
-        TransactionError err = m_wallet_model->wallet().fillPSBT(SIGHASH_ALL, /*sign=*/false, /*bip32derivs=*/true, &n_could_sign, m_transaction_data, complete);
-        if (err != TransactionError::OK) {
+        const auto err{m_wallet_model->wallet().fillPSBT(SIGHASH_ALL, /*sign=*/false, /*bip32derivs=*/true, &n_could_sign, m_transaction_data, complete)};
+        if (err) {
             showStatus(tr("Failed to load transaction: %1")
-                           .arg(QString::fromStdString(TransactionErrorString(err).translated)),
+                           .arg(QString::fromStdString(PSBTErrorString(*err).translated)),
                        StatusLevel::ERR);
             return;
         }
@@ -79,11 +80,11 @@ void PSBTOperationsDialog::signTransaction()
 
     WalletModel::UnlockContext ctx(m_wallet_model->requestUnlock());
 
-    TransactionError err = m_wallet_model->wallet().fillPSBT(SIGHASH_ALL, /*sign=*/true, /*bip32derivs=*/true, &n_signed, m_transaction_data, complete);
+    const auto err{m_wallet_model->wallet().fillPSBT(SIGHASH_ALL, /*sign=*/true, /*bip32derivs=*/true, &n_signed, m_transaction_data, complete)};
 
-    if (err != TransactionError::OK) {
+    if (err) {
         showStatus(tr("Failed to sign transaction: %1")
-            .arg(QString::fromStdString(TransactionErrorString(err).translated)), StatusLevel::ERR);
+            .arg(QString::fromStdString(PSBTErrorString(*err).translated)), StatusLevel::ERR);
         return;
     }
 
@@ -247,9 +248,9 @@ size_t PSBTOperationsDialog::couldSignInputs(const PartiallySignedTransaction &p
 
     size_t n_signed;
     bool complete;
-    TransactionError err = m_wallet_model->wallet().fillPSBT(SIGHASH_ALL, /*sign=*/false, /*bip32derivs=*/false, &n_signed, m_transaction_data, complete);
+    const auto err{m_wallet_model->wallet().fillPSBT(SIGHASH_ALL, /*sign=*/false, /*bip32derivs=*/false, &n_signed, m_transaction_data, complete)};
 
-    if (err != TransactionError::OK) {
+    if (err) {
         return 0;
     }
     return n_signed;
diff --git a/src/qt/sendcoinsdialog.cpp b/src/qt/sendcoinsdialog.cpp
index 0d8c0f7a636..401c79f007a 100644
--- a/src/qt/sendcoinsdialog.cpp
+++ b/src/qt/sendcoinsdialog.cpp
@@ -37,6 +37,7 @@
 #include <QSettings>
 #include <QTextDocument>
 
+using common::PSBTError;
 using wallet::CCoinControl;
 using wallet::DEFAULT_PAY_TX_FEE;
 
@@ -442,26 +443,26 @@ void SendCoinsDialog::presentPSBT(PartiallySignedTransaction& psbtx)
 }
 
 bool SendCoinsDialog::signWithExternalSigner(PartiallySignedTransaction& psbtx, CMutableTransaction& mtx, bool& complete) {
-    TransactionError err;
+    std::optional<PSBTError> err;
     try {
         err = model->wallet().fillPSBT(SIGHASH_ALL, /*sign=*/true, /*bip32derivs=*/true, /*n_signed=*/nullptr, psbtx, complete);
     } catch (const std::runtime_error& e) {
         QMessageBox::critical(nullptr, tr("Sign failed"), e.what());
         return false;
     }
-    if (err == TransactionError::EXTERNAL_SIGNER_NOT_FOUND) {
+    if (err == PSBTError::EXTERNAL_SIGNER_NOT_FOUND) {
         //: "External signer" means using devices such as hardware wallets.
         const QString msg = tr("External signer not found");
         QMessageBox::critical(nullptr, msg, msg);
         return false;
     }
-    if (err == TransactionError::EXTERNAL_SIGNER_FAILED) {
+    if (err == PSBTError::EXTERNAL_SIGNER_FAILED) {
         //: "External signer" means using devices such as hardware wallets.
         const QString msg = tr("External signer failure");
         QMessageBox::critical(nullptr, msg, msg);
         return false;
     }
-    if (err != TransactionError::OK) {
+    if (err) {
         tfm::format(std::cerr, "Failed to sign PSBT");
         processSendCoinsReturn(WalletModel::TransactionCreationFailed);
         return false;
@@ -501,9 +502,9 @@ void SendCoinsDialog::sendButtonClicked([[maybe_unused]] bool checked)
         PartiallySignedTransaction psbtx(mtx);
         bool complete = false;
         // Fill without signing
-        TransactionError err = model->wallet().fillPSBT(SIGHASH_ALL, /*sign=*/false, /*bip32derivs=*/true, /*n_signed=*/nullptr, psbtx, complete);
+        const auto err{model->wallet().fillPSBT(SIGHASH_ALL, /*sign=*/false, /*bip32derivs=*/true, /*n_signed=*/nullptr, psbtx, complete)};
         assert(!complete);
-        assert(err == TransactionError::OK);
+        assert(!err);
 
         // Copy PSBT to clipboard and offer to save
         presentPSBT(psbtx);
@@ -517,9 +518,9 @@ void SendCoinsDialog::sendButtonClicked([[maybe_unused]] bool checked)
             bool complete = false;
             // Always fill without signing first. This prevents an external signer
             // from being called prematurely and is not expensive.
-            TransactionError err = model->wallet().fillPSBT(SIGHASH_ALL, /*sign=*/false, /*bip32derivs=*/true, /*n_signed=*/nullptr, psbtx, complete);
+            const auto err{model->wallet().fillPSBT(SIGHASH_ALL, /*sign=*/false, /*bip32derivs=*/true, /*n_signed=*/nullptr, psbtx, complete)};
             assert(!complete);
-            assert(err == TransactionError::OK);
+            assert(!err);
             send_failure = !signWithExternalSigner(psbtx, mtx, complete);
             // Don't broadcast when user rejects it on the device or there's a failure:
             broadcast = complete && !send_failure;
diff --git a/src/qt/walletmodel.cpp b/src/qt/walletmodel.cpp
index 87ad98a4cc3..f7843706e07 100644
--- a/src/qt/walletmodel.cpp
+++ b/src/qt/walletmodel.cpp
@@ -534,8 +534,8 @@ bool WalletModel::bumpFee(uint256 hash, uint256& new_hash)
         // "Create Unsigned" clicked
         PartiallySignedTransaction psbtx(mtx);
         bool complete = false;
-        const TransactionError err = wallet().fillPSBT(SIGHASH_ALL, /*sign=*/false, /*bip32derivs=*/true, nullptr, psbtx, complete);
-        if (err != TransactionError::OK || complete) {
+        const auto err{wallet().fillPSBT(SIGHASH_ALL, /*sign=*/false, /*bip32derivs=*/true, nullptr, psbtx, complete)};
+        if (err || complete) {
             QMessageBox::critical(nullptr, tr("Fee bump error"), tr("Can't draft transaction."));
             return false;
         }
diff --git a/src/rpc/rawtransaction.cpp b/src/rpc/rawtransaction.cpp
index 634be2f7fb9..674f9bfe90c 100644
--- a/src/rpc/rawtransaction.cpp
+++ b/src/rpc/rawtransaction.cpp
@@ -1485,9 +1485,8 @@ static RPCHelpMan combinepsbt()
     }
 
     PartiallySignedTransaction merged_psbt;
-    const TransactionError error = CombinePSBTs(merged_psbt, psbtxs);
-    if (error != TransactionError::OK) {
-        throw JSONRPCTransactionError(error);
+    if (!CombinePSBTs(merged_psbt, psbtxs)) {
+        throw JSONRPCError(RPC_INVALID_PARAMETER, "PSBTs not compatible (different transactions)");
     }
 
     DataStream ssTx{};
diff --git a/src/rpc/util.cpp b/src/rpc/util.cpp
index f5a2e9eb639..9ae6dd98e97 100644
--- a/src/rpc/util.cpp
+++ b/src/rpc/util.cpp
@@ -7,6 +7,7 @@
 #include <clientversion.h>
 #include <core_io.h>
 #include <common/args.h>
+#include <common/types.h>
 #include <consensus/amount.h>
 #include <script/interpreter.h>
 #include <key_io.h>
@@ -30,6 +31,8 @@
 #include <tuple>
 #include <utility>
 
+using common::PSBTError;
+
 const std::string UNIX_EPOCH_TIME = "UNIX epoch time";
 const std::string EXAMPLE_ADDRESS[2] = {"bc1q09vm5lfy0j5reeulh4x5752q25uqqvz34hufdl", "bc1q02ad21edsxd23d32dfgqqsz4vv4nmtfzuklhy3"};
 
@@ -364,6 +367,18 @@ unsigned int ParseConfirmTarget(const UniValue& value, unsigned int max_target)
     return unsigned_target;
 }
 
+RPCErrorCode RPCErrorFromPSBTError(PSBTError err)
+{
+    switch (err) {
+        case PSBTError::UNSUPPORTED:
+            return RPC_INVALID_PARAMETER;
+        case PSBTError::SIGHASH_MISMATCH:
+            return RPC_DESERIALIZATION_ERROR;
+        default: break;
+    }
+    return RPC_TRANSACTION_ERROR;
+}
+
 RPCErrorCode RPCErrorFromTransactionError(TransactionError terr)
 {
     switch (terr) {
@@ -371,18 +386,16 @@ RPCErrorCode RPCErrorFromTransactionError(TransactionError terr)
             return RPC_TRANSACTION_REJECTED;
         case TransactionError::ALREADY_IN_CHAIN:
             return RPC_TRANSACTION_ALREADY_IN_CHAIN;
-        case TransactionError::P2P_DISABLED:
-            return RPC_CLIENT_P2P_DISABLED;
-        case TransactionError::INVALID_PSBT:
-        case TransactionError::PSBT_MISMATCH:
-            return RPC_INVALID_PARAMETER;
-        case TransactionError::SIGHASH_MISMATCH:
-            return RPC_DESERIALIZATION_ERROR;
         default: break;
     }
     return RPC_TRANSACTION_ERROR;
 }
 
+UniValue JSONRPCPSBTError(PSBTError err)
+{
+    return JSONRPCError(RPCErrorFromPSBTError(err), PSBTErrorString(err).original);
+}
+
 UniValue JSONRPCTransactionError(TransactionError terr, const std::string& err_string)
 {
     if (err_string.length() > 0) {
diff --git a/src/rpc/util.h b/src/rpc/util.h
index 0e4dcc27b5e..5522e346d2d 100644
--- a/src/rpc/util.h
+++ b/src/rpc/util.h
@@ -37,6 +37,9 @@ enum class OutputType;
 enum class TransactionError;
 struct FlatSigningProvider;
 struct bilingual_str;
+namespace common {
+enum class PSBTError;
+} // namespace common
 
 static constexpr bool DEFAULT_RPC_DOC_CHECK{
 #ifdef RPC_DOC_CHECK
@@ -128,6 +131,7 @@ int ParseSighashString(const UniValue& sighash);
 unsigned int ParseConfirmTarget(const UniValue& value, unsigned int max_target);
 
 RPCErrorCode RPCErrorFromTransactionError(TransactionError terr);
+UniValue JSONRPCPSBTError(common::PSBTError err);
 UniValue JSONRPCTransactionError(TransactionError terr, const std::string& err_string = "");
 
 //! Parse a JSON range specified as int64, or [int64, int64]
diff --git a/src/test/fuzz/kitchen_sink.cpp b/src/test/fuzz/kitchen_sink.cpp
index 82f3a306c58..42a6b316c32 100644
--- a/src/test/fuzz/kitchen_sink.cpp
+++ b/src/test/fuzz/kitchen_sink.cpp
@@ -18,15 +18,10 @@
 
 namespace {
 constexpr TransactionError ALL_TRANSACTION_ERROR[] = {
-    TransactionError::OK,
     TransactionError::MISSING_INPUTS,
     TransactionError::ALREADY_IN_CHAIN,
-    TransactionError::P2P_DISABLED,
     TransactionError::MEMPOOL_REJECTED,
     TransactionError::MEMPOOL_ERROR,
-    TransactionError::INVALID_PSBT,
-    TransactionError::PSBT_MISMATCH,
-    TransactionError::SIGHASH_MISMATCH,
     TransactionError::MAX_FEE_EXCEEDED,
 };
 }; // namespace
diff --git a/src/util/error.cpp b/src/util/error.cpp
index 309877d0675..9d506ee25cf 100644
--- a/src/util/error.cpp
+++ b/src/util/error.cpp
@@ -4,12 +4,33 @@
 
 #include <util/error.h>
 
+#include <common/types.h>
 #include <tinyformat.h>
 #include <util/translation.h>
 
 #include <cassert>
 #include <string>
 
+using common::PSBTError;
+
+bilingual_str PSBTErrorString(PSBTError err)
+{
+    switch (err) {
+        case PSBTError::MISSING_INPUTS:
+            return Untranslated("Inputs missing or spent");
+        case PSBTError::SIGHASH_MISMATCH:
+            return Untranslated("Specified sighash value does not match value stored in PSBT");
+        case PSBTError::EXTERNAL_SIGNER_NOT_FOUND:
+            return Untranslated("External signer not found");
+        case PSBTError::EXTERNAL_SIGNER_FAILED:
+            return Untranslated("External signer failed to sign");
+        case PSBTError::UNSUPPORTED:
+            return Untranslated("Signer does not support PSBT");
+        // no default case, so the compiler can warn about missing cases
+    }
+    assert(false);
+}
+
 bilingual_str TransactionErrorString(const TransactionError err)
 {
     switch (err) {
@@ -19,26 +40,14 @@ bilingual_str TransactionErrorString(const TransactionError err)
             return Untranslated("Inputs missing or spent");
         case TransactionError::ALREADY_IN_CHAIN:
             return Untranslated("Transaction already in block chain");
-        case TransactionError::P2P_DISABLED:
-            return Untranslated("Peer-to-peer functionality missing or disabled");
         case TransactionError::MEMPOOL_REJECTED:
             return Untranslated("Transaction rejected by mempool");
         case TransactionError::MEMPOOL_ERROR:
             return Untranslated("Mempool internal error");
-        case TransactionError::INVALID_PSBT:
-            return Untranslated("PSBT is not well-formed");
-        case TransactionError::PSBT_MISMATCH:
-            return Untranslated("PSBTs not compatible (different transactions)");
-        case TransactionError::SIGHASH_MISMATCH:
-            return Untranslated("Specified sighash value does not match value stored in PSBT");
         case TransactionError::MAX_FEE_EXCEEDED:
             return Untranslated("Fee exceeds maximum configured by user (e.g. -maxtxfee, maxfeerate)");
         case TransactionError::MAX_BURN_EXCEEDED:
             return Untranslated("Unspendable output exceeds maximum configured by user (maxburnamount)");
-        case TransactionError::EXTERNAL_SIGNER_NOT_FOUND:
-            return Untranslated("External signer not found");
-        case TransactionError::EXTERNAL_SIGNER_FAILED:
-            return Untranslated("External signer failed to sign");
         case TransactionError::INVALID_PACKAGE:
             return Untranslated("Transaction rejected due to invalid package");
         // no default case, so the compiler can warn about missing cases
diff --git a/src/util/error.h b/src/util/error.h
index ee2d8dbf192..5ef833b9ee2 100644
--- a/src/util/error.h
+++ b/src/util/error.h
@@ -19,6 +19,11 @@
 #include <string>
 
 struct bilingual_str;
+namespace common {
+enum class PSBTError;
+} // namespace common
+
+bilingual_str PSBTErrorString(common::PSBTError err);
 
 bilingual_str TransactionErrorString(const TransactionError error);
 
diff --git a/src/wallet/external_signer_scriptpubkeyman.cpp b/src/wallet/external_signer_scriptpubkeyman.cpp
index b5703fa54ae..f98ecc3f3c7 100644
--- a/src/wallet/external_signer_scriptpubkeyman.cpp
+++ b/src/wallet/external_signer_scriptpubkeyman.cpp
@@ -17,6 +17,8 @@
 #include <utility>
 #include <vector>
 
+using common::PSBTError;
+
 namespace wallet {
 bool ExternalSignerScriptPubKeyMan::SetupDescriptor(WalletBatch& batch, std::unique_ptr<Descriptor> desc)
 {
@@ -76,7 +78,7 @@ util::Result<void> ExternalSignerScriptPubKeyMan::DisplayAddress(const CTxDestin
 }
 
 // If sign is true, transaction must previously have been filled
-TransactionError ExternalSignerScriptPubKeyMan::FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type, bool sign, bool bip32derivs, int* n_signed, bool finalize) const
+std::optional<PSBTError> ExternalSignerScriptPubKeyMan::FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type, bool sign, bool bip32derivs, int* n_signed, bool finalize) const
 {
     if (!sign) {
         return DescriptorScriptPubKeyMan::FillPSBT(psbt, txdata, sighash_type, false, bip32derivs, n_signed, finalize);
@@ -88,14 +90,14 @@ TransactionError ExternalSignerScriptPubKeyMan::FillPSBT(PartiallySignedTransact
         // TODO: for multisig wallets, we should only care if all _our_ inputs are signed
         complete &= PSBTInputSigned(input);
     }
-    if (complete) return TransactionError::OK;
+    if (complete) return {};
 
     std::string strFailReason;
     if(!GetExternalSigner().SignTransaction(psbt, strFailReason)) {
         tfm::format(std::cerr, "Failed to sign: %s\n", strFailReason);
-        return TransactionError::EXTERNAL_SIGNER_FAILED;
+        return PSBTError::EXTERNAL_SIGNER_FAILED;
     }
     if (finalize) FinalizePSBT(psbt); // This won't work in a multisig setup
-    return TransactionError::OK;
+    return {};
 }
 } // namespace wallet
diff --git a/src/wallet/external_signer_scriptpubkeyman.h b/src/wallet/external_signer_scriptpubkeyman.h
index 44286456b61..10d67d2ab47 100644
--- a/src/wallet/external_signer_scriptpubkeyman.h
+++ b/src/wallet/external_signer_scriptpubkeyman.h
@@ -35,7 +35,7 @@ class ExternalSignerScriptPubKeyMan : public DescriptorScriptPubKeyMan
   */
  util::Result<void> DisplayAddress(const CTxDestination& dest, const ExternalSigner& signer) const;
 
-  TransactionError FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type = 1 /* SIGHASH_ALL */, bool sign = true, bool bip32derivs = false, int* n_signed = nullptr, bool finalize = true) const override;
+  std::optional<common::PSBTError> FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type = 1 /* SIGHASH_ALL */, bool sign = true, bool bip32derivs = false, int* n_signed = nullptr, bool finalize = true) const override;
 };
 } // namespace wallet
 #endif // BITCOIN_WALLET_EXTERNAL_SIGNER_SCRIPTPUBKEYMAN_H
diff --git a/src/wallet/feebumper.cpp b/src/wallet/feebumper.cpp
index 6a8453965be..8966fde1b71 100644
--- a/src/wallet/feebumper.cpp
+++ b/src/wallet/feebumper.cpp
@@ -343,8 +343,8 @@ bool SignTransaction(CWallet& wallet, CMutableTransaction& mtx) {
         // so external signers are not asked to sign more than once.
         bool complete;
         wallet.FillPSBT(psbtx, complete, SIGHASH_ALL, false /* sign */, true /* bip32derivs */);
-        const TransactionError err = wallet.FillPSBT(psbtx, complete, SIGHASH_ALL, true /* sign */, false  /* bip32derivs */);
-        if (err != TransactionError::OK) return false;
+        auto err{wallet.FillPSBT(psbtx, complete, SIGHASH_ALL, true /* sign */, false  /* bip32derivs */)};
+        if (err) return false;
         complete = FinalizeAndExtractPSBT(psbtx, mtx);
         return complete;
     } else {
diff --git a/src/wallet/interfaces.cpp b/src/wallet/interfaces.cpp
index 0c1cae7253c..4421f0eeae3 100644
--- a/src/wallet/interfaces.cpp
+++ b/src/wallet/interfaces.cpp
@@ -34,6 +34,7 @@
 #include <utility>
 #include <vector>
 
+using common::PSBTError;
 using interfaces::Chain;
 using interfaces::FoundBlock;
 using interfaces::Handler;
@@ -389,7 +390,7 @@ public:
         }
         return {};
     }
-    TransactionError fillPSBT(int sighash_type,
+    std::optional<PSBTError> fillPSBT(int sighash_type,
         bool sign,
         bool bip32derivs,
         size_t* n_signed,
diff --git a/src/wallet/rpc/spend.cpp b/src/wallet/rpc/spend.cpp
index 1a364a75edc..12c59acadf8 100644
--- a/src/wallet/rpc/spend.cpp
+++ b/src/wallet/rpc/spend.cpp
@@ -97,9 +97,9 @@ static UniValue FinishTransaction(const std::shared_ptr<CWallet> pwallet, const
     // so external signers are not asked to sign more than once.
     bool complete;
     pwallet->FillPSBT(psbtx, complete, SIGHASH_DEFAULT, /*sign=*/false, /*bip32derivs=*/true);
-    const TransactionError err{pwallet->FillPSBT(psbtx, complete, SIGHASH_DEFAULT, /*sign=*/true, /*bip32derivs=*/false)};
-    if (err != TransactionError::OK) {
-        throw JSONRPCTransactionError(err);
+    const auto err{pwallet->FillPSBT(psbtx, complete, SIGHASH_DEFAULT, /*sign=*/true, /*bip32derivs=*/false)};
+    if (err) {
+        throw JSONRPCPSBTError(*err);
     }
 
     CMutableTransaction mtx;
@@ -1153,8 +1153,8 @@ static RPCHelpMan bumpfee_helper(std::string method_name)
     } else {
         PartiallySignedTransaction psbtx(mtx);
         bool complete = false;
-        const TransactionError err = pwallet->FillPSBT(psbtx, complete, SIGHASH_DEFAULT, /*sign=*/false, /*bip32derivs=*/true);
-        CHECK_NONFATAL(err == TransactionError::OK);
+        const auto err{pwallet->FillPSBT(psbtx, complete, SIGHASH_DEFAULT, /*sign=*/false, /*bip32derivs=*/true)};
+        CHECK_NONFATAL(!err);
         CHECK_NONFATAL(!complete);
         DataStream ssTx{};
         ssTx << psbtx;
@@ -1602,9 +1602,9 @@ RPCHelpMan walletprocesspsbt()
 
     if (sign) EnsureWalletIsUnlocked(*pwallet);
 
-    const TransactionError err{wallet.FillPSBT(psbtx, complete, nHashType, sign, bip32derivs, nullptr, finalize)};
-    if (err != TransactionError::OK) {
-        throw JSONRPCTransactionError(err);
+    const auto err{wallet.FillPSBT(psbtx, complete, nHashType, sign, bip32derivs, nullptr, finalize)};
+    if (err) {
+        throw JSONRPCPSBTError(*err);
     }
 
     UniValue result(UniValue::VOBJ);
@@ -1736,9 +1736,9 @@ RPCHelpMan walletcreatefundedpsbt()
     // Fill transaction with out data but don't sign
     bool bip32derivs = request.params[4].isNull() ? true : request.params[4].get_bool();
     bool complete = true;
-    const TransactionError err{wallet.FillPSBT(psbtx, complete, 1, /*sign=*/false, /*bip32derivs=*/bip32derivs)};
-    if (err != TransactionError::OK) {
-        throw JSONRPCTransactionError(err);
+    const auto err{wallet.FillPSBT(psbtx, complete, 1, /*sign=*/false, /*bip32derivs=*/bip32derivs)};
+    if (err) {
+        throw JSONRPCPSBTError(*err);
     }
 
     // Serialize the PSBT
diff --git a/src/wallet/scriptpubkeyman.cpp b/src/wallet/scriptpubkeyman.cpp
index b42275fe4bd..69f83ae26c6 100644
--- a/src/wallet/scriptpubkeyman.cpp
+++ b/src/wallet/scriptpubkeyman.cpp
@@ -20,6 +20,8 @@
 
 #include <optional>
 
+using common::PSBTError;
+
 namespace wallet {
 //! Value for the first BIP 32 hardened derivation. Can be used as a bit mask and as a value. See BIP 32 for more details.
 const uint32_t BIP32_HARDENED_KEY_LIMIT = 0x80000000;
@@ -627,7 +629,7 @@ SigningResult LegacyScriptPubKeyMan::SignMessage(const std::string& message, con
     return SigningResult::SIGNING_FAILED;
 }
 
-TransactionError LegacyScriptPubKeyMan::FillPSBT(PartiallySignedTransaction& psbtx, const PrecomputedTransactionData& txdata, int sighash_type, bool sign, bool bip32derivs, int* n_signed, bool finalize) const
+std::optional<PSBTError> LegacyScriptPubKeyMan::FillPSBT(PartiallySignedTransaction& psbtx, const PrecomputedTransactionData& txdata, int sighash_type, bool sign, bool bip32derivs, int* n_signed, bool finalize) const
 {
     if (n_signed) {
         *n_signed = 0;
@@ -642,13 +644,13 @@ TransactionError LegacyScriptPubKeyMan::FillPSBT(PartiallySignedTransaction& psb
 
         // Get the Sighash type
         if (sign && input.sighash_type != std::nullopt && *input.sighash_type != sighash_type) {
-            return TransactionError::SIGHASH_MISMATCH;
+            return PSBTError::SIGHASH_MISMATCH;
         }
 
         // Check non_witness_utxo has specified prevout
         if (input.non_witness_utxo) {
             if (txin.prevout.n >= input.non_witness_utxo->vout.size()) {
-                return TransactionError::MISSING_INPUTS;
+                return PSBTError::MISSING_INPUTS;
             }
         } else if (input.witness_utxo.IsNull()) {
             // There's no UTXO so we can just skip this now
@@ -670,7 +672,7 @@ TransactionError LegacyScriptPubKeyMan::FillPSBT(PartiallySignedTransaction& psb
         UpdatePSBTOutput(HidingSigningProvider(this, true, !bip32derivs), psbtx, i);
     }
 
-    return TransactionError::OK;
+    return {};
 }
 
 std::unique_ptr<CKeyMetadata> LegacyScriptPubKeyMan::GetMetadata(const CTxDestination& dest) const
@@ -2485,7 +2487,7 @@ SigningResult DescriptorScriptPubKeyMan::SignMessage(const std::string& message,
     return SigningResult::OK;
 }
 
-TransactionError DescriptorScriptPubKeyMan::FillPSBT(PartiallySignedTransaction& psbtx, const PrecomputedTransactionData& txdata, int sighash_type, bool sign, bool bip32derivs, int* n_signed, bool finalize) const
+std::optional<PSBTError> DescriptorScriptPubKeyMan::FillPSBT(PartiallySignedTransaction& psbtx, const PrecomputedTransactionData& txdata, int sighash_type, bool sign, bool bip32derivs, int* n_signed, bool finalize) const
 {
     if (n_signed) {
         *n_signed = 0;
@@ -2500,7 +2502,7 @@ TransactionError DescriptorScriptPubKeyMan::FillPSBT(PartiallySignedTransaction&
 
         // Get the Sighash type
         if (sign && input.sighash_type != std::nullopt && *input.sighash_type != sighash_type) {
-            return TransactionError::SIGHASH_MISMATCH;
+            return PSBTError::SIGHASH_MISMATCH;
         }
 
         // Get the scriptPubKey to know which SigningProvider to use
@@ -2509,7 +2511,7 @@ TransactionError DescriptorScriptPubKeyMan::FillPSBT(PartiallySignedTransaction&
             script = input.witness_utxo.scriptPubKey;
         } else if (input.non_witness_utxo) {
             if (txin.prevout.n >= input.non_witness_utxo->vout.size()) {
-                return TransactionError::MISSING_INPUTS;
+                return PSBTError::MISSING_INPUTS;
             }
             script = input.non_witness_utxo->vout[txin.prevout.n].scriptPubKey;
         } else {
@@ -2580,7 +2582,7 @@ TransactionError DescriptorScriptPubKeyMan::FillPSBT(PartiallySignedTransaction&
         UpdatePSBTOutput(HidingSigningProvider(keys.get(), /*hide_secret=*/true, /*hide_origin=*/!bip32derivs), psbtx, i);
     }
 
-    return TransactionError::OK;
+    return {};
 }
 
 std::unique_ptr<CKeyMetadata> DescriptorScriptPubKeyMan::GetMetadata(const CTxDestination& dest) const
diff --git a/src/wallet/scriptpubkeyman.h b/src/wallet/scriptpubkeyman.h
index 5ca7d1ff52e..470a73e6b33 100644
--- a/src/wallet/scriptpubkeyman.h
+++ b/src/wallet/scriptpubkeyman.h
@@ -7,6 +7,7 @@
 
 #include <addresstype.h>
 #include <common/signmessage.h>
+#include <common/types.h>
 #include <logging.h>
 #include <psbt.h>
 #include <script/descriptor.h>
@@ -243,7 +244,7 @@ public:
     /** Sign a message with the given script */
     virtual SigningResult SignMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) const { return SigningResult::SIGNING_FAILED; };
     /** Adds script and derivation path information to a PSBT, and optionally signs it. */
-    virtual TransactionError FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type = SIGHASH_DEFAULT, bool sign = true, bool bip32derivs = false, int* n_signed = nullptr, bool finalize = true) const { return TransactionError::INVALID_PSBT; }
+    virtual std::optional<common::PSBTError> FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type = SIGHASH_DEFAULT, bool sign = true, bool bip32derivs = false, int* n_signed = nullptr, bool finalize = true) const { return common::PSBTError::UNSUPPORTED; }
 
     virtual uint256 GetID() const { return uint256(); }
 
@@ -421,7 +422,7 @@ public:
 
     bool SignTransaction(CMutableTransaction& tx, const std::map<COutPoint, Coin>& coins, int sighash, std::map<int, bilingual_str>& input_errors) const override;
     SigningResult SignMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) const override;
-    TransactionError FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type = SIGHASH_DEFAULT, bool sign = true, bool bip32derivs = false, int* n_signed = nullptr, bool finalize = true) const override;
+    std::optional<common::PSBTError> FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type = SIGHASH_DEFAULT, bool sign = true, bool bip32derivs = false, int* n_signed = nullptr, bool finalize = true) const override;
 
     uint256 GetID() const override;
 
@@ -651,7 +652,7 @@ public:
 
     bool SignTransaction(CMutableTransaction& tx, const std::map<COutPoint, Coin>& coins, int sighash, std::map<int, bilingual_str>& input_errors) const override;
     SigningResult SignMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) const override;
-    TransactionError FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type = SIGHASH_DEFAULT, bool sign = true, bool bip32derivs = false, int* n_signed = nullptr, bool finalize = true) const override;
+    std::optional<common::PSBTError> FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type = SIGHASH_DEFAULT, bool sign = true, bool bip32derivs = false, int* n_signed = nullptr, bool finalize = true) const override;
 
     uint256 GetID() const override;
 
diff --git a/src/wallet/test/psbt_wallet_tests.cpp b/src/wallet/test/psbt_wallet_tests.cpp
index 9f533bf6edc..e924f906307 100644
--- a/src/wallet/test/psbt_wallet_tests.cpp
+++ b/src/wallet/test/psbt_wallet_tests.cpp
@@ -60,7 +60,7 @@ BOOST_AUTO_TEST_CASE(psbt_updater_test)
 
     // Fill transaction with our data
     bool complete = true;
-    BOOST_REQUIRE_EQUAL(TransactionError::OK, m_wallet.FillPSBT(psbtx, complete, SIGHASH_ALL, false, true));
+    BOOST_REQUIRE(!m_wallet.FillPSBT(psbtx, complete, SIGHASH_ALL, false, true));
 
     // Get the final tx
     DataStream ssTx{};
@@ -73,7 +73,7 @@ BOOST_AUTO_TEST_CASE(psbt_updater_test)
 
     // Try to sign the mutated input
     SignatureData sigdata;
-    BOOST_CHECK(m_wallet.FillPSBT(psbtx, complete, SIGHASH_ALL, true, true) != TransactionError::OK);
+    BOOST_CHECK(m_wallet.FillPSBT(psbtx, complete, SIGHASH_ALL, true, true));
 }
 
 BOOST_AUTO_TEST_CASE(parse_hd_keypath)
diff --git a/src/wallet/wallet.cpp b/src/wallet/wallet.cpp
index 0297009a4be..f0c320fcff1 100644
--- a/src/wallet/wallet.cpp
+++ b/src/wallet/wallet.cpp
@@ -81,6 +81,7 @@
 
 struct KeyOriginInfo;
 
+using common::PSBTError;
 using interfaces::FoundBlock;
 
 namespace wallet {
@@ -2167,7 +2168,7 @@ bool CWallet::SignTransaction(CMutableTransaction& tx, const std::map<COutPoint,
     return false;
 }
 
-TransactionError CWallet::FillPSBT(PartiallySignedTransaction& psbtx, bool& complete, int sighash_type, bool sign, bool bip32derivs, size_t * n_signed, bool finalize) const
+std::optional<PSBTError> CWallet::FillPSBT(PartiallySignedTransaction& psbtx, bool& complete, int sighash_type, bool sign, bool bip32derivs, size_t * n_signed, bool finalize) const
 {
     if (n_signed) {
         *n_signed = 0;
@@ -2200,9 +2201,9 @@ TransactionError CWallet::FillPSBT(PartiallySignedTransaction& psbtx, bool& comp
     // Fill in information from ScriptPubKeyMans
     for (ScriptPubKeyMan* spk_man : GetAllScriptPubKeyMans()) {
         int n_signed_this_spkm = 0;
-        TransactionError res = spk_man->FillPSBT(psbtx, txdata, sighash_type, sign, bip32derivs, &n_signed_this_spkm, finalize);
-        if (res != TransactionError::OK) {
-            return res;
+        const auto error{spk_man->FillPSBT(psbtx, txdata, sighash_type, sign, bip32derivs, &n_signed_this_spkm, finalize)};
+        if (error) {
+            return error;
         }
 
         if (n_signed) {
@@ -2218,7 +2219,7 @@ TransactionError CWallet::FillPSBT(PartiallySignedTransaction& psbtx, bool& comp
         complete &= PSBTInputSigned(input);
     }
 
-    return TransactionError::OK;
+    return {};
 }
 
 SigningResult CWallet::SignMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) const
diff --git a/src/wallet/wallet.h b/src/wallet/wallet.h
index 6a998fa3983..5bc888462f3 100644
--- a/src/wallet/wallet.h
+++ b/src/wallet/wallet.h
@@ -58,7 +58,9 @@ class Coin;
 class SigningProvider;
 enum class MemPoolRemovalReason;
 enum class SigningResult;
-enum class TransactionError;
+namespace common {
+enum class PSBTError;
+} // namespace common
 namespace interfaces {
 class Wallet;
 }
@@ -659,7 +661,7 @@ public:
      * @param[in] finalize whether to create the final scriptSig or scriptWitness if possible
      * return error
      */
-    TransactionError FillPSBT(PartiallySignedTransaction& psbtx,
+    std::optional<common::PSBTError> FillPSBT(PartiallySignedTransaction& psbtx,
                   bool& complete,
                   int sighash_type = SIGHASH_DEFAULT,
                   bool sign = true,