diff --git a/cardano-api/gen/Test/Gen/Cardano/Api/Typed.hs b/cardano-api/gen/Test/Gen/Cardano/Api/Typed.hs
index 87a6d58230..b8bee0b5dc 100644
--- a/cardano-api/gen/Test/Gen/Cardano/Api/Typed.hs
+++ b/cardano-api/gen/Test/Gen/Cardano/Api/Typed.hs
@@ -583,15 +583,16 @@ genTxAuxScripts era =
                  (genScriptInEra era)
 
 genTxWithdrawals :: CardanoEra era -> Gen (TxWithdrawals BuildTx era)
-genTxWithdrawals era =
-  case withdrawalsSupportedInEra era of
-    Nothing -> pure TxWithdrawalsNone
-    Just supported ->
+genTxWithdrawals =
+  inEonForEra
+    (pure TxWithdrawalsNone)
+    (\w ->
       Gen.choice
         [ pure TxWithdrawalsNone
-        , pure (TxWithdrawals supported mempty)
+        , pure (TxWithdrawals w mempty)
           -- TODO: Generate withdrawals
         ]
+    )
 
 genTxCertificates :: CardanoEra era -> Gen (TxCertificates BuildTx era)
 genTxCertificates =
diff --git a/cardano-api/internal/Cardano/Api/Tx.hs b/cardano-api/internal/Cardano/Api/Tx.hs
index 3619b60a76..442185e737 100644
--- a/cardano-api/internal/Cardano/Api/Tx.hs
+++ b/cardano-api/internal/Cardano/Api/Tx.hs
@@ -50,6 +50,7 @@ module Cardano.Api.Tx (
 
 import           Cardano.Api.Address
 import           Cardano.Api.Certificate
+import           Cardano.Api.Eon.AlonzoEraOnwards
 import           Cardano.Api.Eon.ShelleyBasedEra
 import           Cardano.Api.Eras
 import           Cardano.Api.Eras.Constraints
diff --git a/cardano-api/internal/Cardano/Api/TxBody.hs b/cardano-api/internal/Cardano/Api/TxBody.hs
index 3cebe68ed6..a0a4675de5 100644
--- a/cardano-api/internal/Cardano/Api/TxBody.hs
+++ b/cardano-api/internal/Cardano/Api/TxBody.hs
@@ -120,8 +120,6 @@ module Cardano.Api.TxBody (
     ValidityLowerBoundSupportedInEra(..),
     AuxScriptsSupportedInEra(..),
     TxExtraKeyWitnessesSupportedInEra(..),
-    AlonzoEraOnwards(..),
-    WithdrawalsSupportedInEra(..),
     TxTotalAndReturnCollateralSupportedInEra(..),
 
     -- ** Feature availability functions
@@ -131,7 +129,6 @@ module Cardano.Api.TxBody (
     validityLowerBoundSupportedInEra,
     auxScriptsSupportedInEra,
     extraKeyWitnessesSupportedInEra,
-    withdrawalsSupportedInEra,
     txScriptValiditySupportedInShelleyBasedEra,
     txScriptValiditySupportedInCardanoEra,
     totalAndReturnCollateralSupportedInEra,
@@ -1058,34 +1055,6 @@ extraKeyWitnessesSupportedInEra BabbageEra = Just ExtraKeyWitnessesInBabbageEra
 extraKeyWitnessesSupportedInEra ConwayEra  = Just ExtraKeyWitnessesInConwayEra
 
 
--- | A representation of whether the era supports withdrawals from reward
--- accounts.
---
--- The Shelley and subsequent eras support stake addresses, their associated
--- reward accounts and support for withdrawals from them.
---
-data WithdrawalsSupportedInEra era where
-
-     WithdrawalsInShelleyEra :: WithdrawalsSupportedInEra ShelleyEra
-     WithdrawalsInAllegraEra :: WithdrawalsSupportedInEra AllegraEra
-     WithdrawalsInMaryEra    :: WithdrawalsSupportedInEra MaryEra
-     WithdrawalsInAlonzoEra  :: WithdrawalsSupportedInEra AlonzoEra
-     WithdrawalsInBabbageEra :: WithdrawalsSupportedInEra BabbageEra
-     WithdrawalsInConwayEra :: WithdrawalsSupportedInEra ConwayEra
-
-deriving instance Eq   (WithdrawalsSupportedInEra era)
-deriving instance Show (WithdrawalsSupportedInEra era)
-
-withdrawalsSupportedInEra :: CardanoEra era
-                          -> Maybe (WithdrawalsSupportedInEra era)
-withdrawalsSupportedInEra ByronEra   = Nothing
-withdrawalsSupportedInEra ShelleyEra = Just WithdrawalsInShelleyEra
-withdrawalsSupportedInEra AllegraEra = Just WithdrawalsInAllegraEra
-withdrawalsSupportedInEra MaryEra    = Just WithdrawalsInMaryEra
-withdrawalsSupportedInEra AlonzoEra  = Just WithdrawalsInAlonzoEra
-withdrawalsSupportedInEra BabbageEra = Just WithdrawalsInBabbageEra
-withdrawalsSupportedInEra ConwayEra  = Just WithdrawalsInConwayEra
-
 -- ----------------------------------------------------------------------------
 -- Building vs viewing transactions
 --
@@ -1454,12 +1423,13 @@ deriving instance Show (TxExtraKeyWitnesses era)
 
 data TxWithdrawals build era where
 
-     TxWithdrawalsNone :: TxWithdrawals build era
+  TxWithdrawalsNone
+    :: TxWithdrawals build era
 
-     TxWithdrawals     :: WithdrawalsSupportedInEra era
-                       -> [(StakeAddress, Lovelace,
-                            BuildTxWith build (Witness WitCtxStake era))]
-                       -> TxWithdrawals build era
+  TxWithdrawals
+    :: ShelleyBasedEra era
+    -> [(StakeAddress, Lovelace, BuildTxWith build (Witness WitCtxStake era))]
+    -> TxWithdrawals build era
 
 deriving instance Eq   (TxWithdrawals build era)
 deriving instance Show (TxWithdrawals build era)
@@ -2905,50 +2875,11 @@ fromLedgerTxWithdrawals
   -> Ledger.TxBody (ShelleyLedgerEra era)
   -> TxWithdrawals ViewTx era
 fromLedgerTxWithdrawals sbe body =
-  case sbe of
-    ShelleyBasedEraShelley
-      | null (L.unWithdrawals withdrawals) -> TxWithdrawalsNone
-      | otherwise ->
-          TxWithdrawals WithdrawalsInShelleyEra $
-          fromShelleyWithdrawal withdrawals
-      where
-        withdrawals = body ^. L.withdrawalsTxBodyL
-
-    ShelleyBasedEraAllegra
-      | null (L.unWithdrawals withdrawals) -> TxWithdrawalsNone
-      | otherwise ->
-          TxWithdrawals WithdrawalsInAllegraEra $
-          fromShelleyWithdrawal withdrawals
-      where
-        withdrawals = body ^. L.withdrawalsTxBodyL
-
-    ShelleyBasedEraMary
-      | null (L.unWithdrawals withdrawals) -> TxWithdrawalsNone
-      | otherwise ->
-          TxWithdrawals WithdrawalsInMaryEra $ fromShelleyWithdrawal withdrawals
-      where
-        withdrawals = body ^. L.withdrawalsTxBodyL
-
-    ShelleyBasedEraAlonzo
-      | null (L.unWithdrawals withdrawals) -> TxWithdrawalsNone
-      | otherwise ->
-          TxWithdrawals WithdrawalsInAlonzoEra $ fromShelleyWithdrawal withdrawals
-      where
-        withdrawals = body ^. L.withdrawalsTxBodyL
-
-    ShelleyBasedEraBabbage
-      | null (L.unWithdrawals withdrawals) -> TxWithdrawalsNone
-      | otherwise ->
-          TxWithdrawals WithdrawalsInBabbageEra $ fromShelleyWithdrawal withdrawals
-      where
-        withdrawals = body ^. L.withdrawalsTxBodyL
-
-    ShelleyBasedEraConway
-      | null (L.unWithdrawals withdrawals) -> TxWithdrawalsNone
-      | otherwise ->
-          TxWithdrawals WithdrawalsInConwayEra $ fromShelleyWithdrawal withdrawals
-      where
-        withdrawals = body ^. L.withdrawalsTxBodyL
+  shelleyBasedEraConstraints sbe $
+    let withdrawals = body ^. L.withdrawalsTxBodyL in
+    if null (L.unWithdrawals withdrawals)
+      then TxWithdrawalsNone
+      else TxWithdrawals sbe $ fromShelleyWithdrawal withdrawals
 
 fromLedgerTxCertificates
   :: ShelleyBasedEra era
diff --git a/cardano-api/src/Cardano/Api.hs b/cardano-api/src/Cardano/Api.hs
index e7ba5abe2e..829a92a2c2 100644
--- a/cardano-api/src/Cardano/Api.hs
+++ b/cardano-api/src/Cardano/Api.hs
@@ -393,7 +393,6 @@ module Cardano.Api (
     ValidityLowerBoundSupportedInEra(..),
     AuxScriptsSupportedInEra(..),
     TxExtraKeyWitnessesSupportedInEra(..),
-    WithdrawalsSupportedInEra(..),
     TxTotalAndReturnCollateralSupportedInEra(..),
 
     -- ** Feature availability functions
@@ -403,7 +402,6 @@ module Cardano.Api (
     validityLowerBoundSupportedInEra,
     auxScriptsSupportedInEra,
     extraKeyWitnessesSupportedInEra,
-    withdrawalsSupportedInEra,
     totalAndReturnCollateralSupportedInEra,
 
     -- ** Era-dependent protocol features