diff --git a/src/consensus/tx_verify.cpp b/src/consensus/tx_verify.cpp
--- a/src/consensus/tx_verify.cpp
+++ b/src/consensus/tx_verify.cpp
@@ -175,7 +175,7 @@
         if (coin.IsCoinBase() &&
             nSpendHeight - coin.GetHeight() < COINBASE_MATURITY) {
             return state.Invalid(
-                ValidationInvalidReason::TX_MISSING_INPUTS, false,
+                ValidationInvalidReason::TX_PREMATURE_SPEND, false,
                 REJECT_INVALID, "bad-txns-premature-spend-of-coinbase",
                 strprintf("tried to spend coinbase at depth %d",
                           nSpendHeight - coin.GetHeight()));
diff --git a/src/consensus/validation.h b/src/consensus/validation.h
--- a/src/consensus/validation.h
+++ b/src/consensus/validation.h
@@ -55,9 +55,11 @@
     // Only loose txn:
     //! didn't meet our local policy rules
     TX_NOT_STANDARD,
-    //! a transaction was missing some of its inputs (or its inputs were spent
-    //! at < coinbase maturity height)
+    //! a transaction was missing some of its inputs
     TX_MISSING_INPUTS,
+    //! transaction spends a coinbase too early, or violates locktime/sequence
+    //! locks
+    TX_PREMATURE_SPEND,
     /**
      * Tx already in mempool or conflicts with a tx in the chain
      * TODO: Currently this is only used if the transaction already exists in
@@ -75,6 +77,7 @@
            r == ValidationInvalidReason::CONSENSUS ||
            r == ValidationInvalidReason::RECENT_CONSENSUS_CHANGE ||
            r == ValidationInvalidReason::TX_NOT_STANDARD ||
+           r == ValidationInvalidReason::TX_PREMATURE_SPEND ||
            r == ValidationInvalidReason::TX_MISSING_INPUTS ||
            r == ValidationInvalidReason::TX_CONFLICT ||
            r == ValidationInvalidReason::TX_MEMPOOL_POLICY;
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -1276,6 +1276,7 @@
         case ValidationInvalidReason::BLOCK_TIME_FUTURE:
         case ValidationInvalidReason::TX_NOT_STANDARD:
         case ValidationInvalidReason::TX_MISSING_INPUTS:
+        case ValidationInvalidReason::TX_PREMATURE_SPEND:
         case ValidationInvalidReason::TX_CONFLICT:
         case ValidationInvalidReason::TX_MEMPOOL_POLICY:
             break;
diff --git a/src/validation.cpp b/src/validation.cpp
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -375,7 +375,7 @@
             consensusParams, tx, ctxState, STANDARD_LOCKTIME_VERIFY_FLAGS)) {
         // We copy the state from a dummy to ensure we don't increase the
         // ban score of peer for transaction that could be valid in the future.
-        return state.Invalid(ValidationInvalidReason::TX_NOT_STANDARD, false,
+        return state.Invalid(ValidationInvalidReason::TX_PREMATURE_SPEND, false,
                              REJECT_NONSTANDARD, ctxState.GetRejectReason(),
                              ctxState.GetDebugMessage());
     }
@@ -456,7 +456,7 @@
         // own.
         if (!CheckSequenceLocks(pool, tx, STANDARD_LOCKTIME_VERIFY_FLAGS,
                                 &lp)) {
-            return state.Invalid(ValidationInvalidReason::TX_NOT_STANDARD,
+            return state.Invalid(ValidationInvalidReason::TX_PREMATURE_SPEND,
                                  false, REJECT_NONSTANDARD, "non-BIP68-final");
         }
 
@@ -1700,17 +1700,15 @@
         Amount txfee = Amount::zero();
         if (!isCoinBase && !Consensus::CheckTxInputs(tx, state, view,
                                                      pindex->nHeight, txfee)) {
-            if (state.GetReason() ==
-                ValidationInvalidReason::TX_MISSING_INPUTS) {
-                // CheckTxInputs may return MISSING_INPUTS but we can't return
-                // that, as it's not defined for a block, so we reset the reason
-                // flag to CONSENSUS here.
+            if (!IsBlockReason(state.GetReason())) {
+                // CheckTxInputs may return MISSING_INPUTS or PREMATURE_SPEND
+                // but we can't return that, as it's not defined for a block, so
+                // we reset the reason flag to CONSENSUS here.
                 state.Invalid(ValidationInvalidReason::CONSENSUS, false,
                               state.GetRejectCode(), state.GetRejectReason(),
                               state.GetDebugMessage());
             }
 
-            assert(IsBlockReason(state.GetReason()));
             return error("%s: Consensus::CheckTxInputs: %s, %s", __func__,
                          tx.GetId().ToString(), FormatStateMessage(state));
         }