diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7516d35b41..8507b6b1f2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -77,7 +77,8 @@ if the provided arguments are invalid.
 * (modules) [\#5299](https://github.com/cosmos/cosmos-sdk/pull/5299) `HandleDoubleSign` along with params `MaxEvidenceAge`
   and `DoubleSignJailEndTime` have moved from the `x/slashing` module to the `x/evidence` module.
 * (keys) [\#4941](https://github.com/cosmos/cosmos-sdk/issues/4941) Initializing a new keybase through `NewKeyringFromHomeFlag`, `NewKeyringFromDir`, `NewKeyBaseFromHomeFlag`, `NewKeyBaseFromDir`, or `NewInMemory` functions now accept optional parameters of type `KeybaseOption`. These optional parameters are also added on the keys subcommands functions, which are now public, and allows these options to be set on the commands or ignored to default to previous behavior. 
-  * The option introduced in this PR is `WithKeygenFunc` which allows a custom bytes to key implementation to be defined when keys are created. 
+  * The option introduced in this PR is `WithKeygenFunc` which allows a custom bytes to key implementation to be defined when keys are created.
+* (simapp) [\#5419](https://github.com/cosmos/cosmos-sdk/pull/5419) simapp/helpers.GenTx() now accepts a gas argument.
 
 ### Client Breaking Changes
 
diff --git a/simapp/helpers/test_helpers.go b/simapp/helpers/test_helpers.go
index a9127a6fbd..2341635eee 100644
--- a/simapp/helpers/test_helpers.go
+++ b/simapp/helpers/test_helpers.go
@@ -12,13 +12,16 @@ import (
 )
 
 // SimAppChainID hardcoded chainID for simulation
-const SimAppChainID = "simulation-app"
+const (
+	DefaultGenTxGas = 1000000
+	SimAppChainID   = "simulation-app"
+)
 
 // GenTx generates a signed mock transaction.
-func GenTx(msgs []sdk.Msg, feeAmt sdk.Coins, chainID string, accnums []uint64, seq []uint64, priv ...crypto.PrivKey) auth.StdTx {
+func GenTx(msgs []sdk.Msg, feeAmt sdk.Coins, gas uint64, chainID string, accnums []uint64, seq []uint64, priv ...crypto.PrivKey) auth.StdTx {
 	fee := auth.StdFee{
 		Amount: feeAmt,
-		Gas:    1000000, // TODO: this should be a param
+		Gas:    gas,
 	}
 
 	sigs := make([]auth.StdSignature, len(priv))
diff --git a/simapp/test_helpers.go b/simapp/test_helpers.go
index 306b4259fb..0e6d221502 100644
--- a/simapp/test_helpers.go
+++ b/simapp/test_helpers.go
@@ -120,6 +120,7 @@ func SignCheckDeliver(
 	tx := helpers.GenTx(
 		msgs,
 		sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 0)},
+		helpers.DefaultGenTxGas,
 		"",
 		accNums,
 		seq,
@@ -163,6 +164,7 @@ func GenSequenceOfTxs(msgs []sdk.Msg, accNums []uint64, initSeqNums []uint64, nu
 		txs[i] = helpers.GenTx(
 			msgs,
 			sdk.Coins{sdk.NewInt64Coin(sdk.DefaultBondDenom, 0)},
+			helpers.DefaultGenTxGas,
 			"",
 			accNums,
 			initSeqNums,
diff --git a/x/bank/simulation/operations.go b/x/bank/simulation/operations.go
index 9e89174e94..71a88386c9 100644
--- a/x/bank/simulation/operations.go
+++ b/x/bank/simulation/operations.go
@@ -108,6 +108,7 @@ func sendMsgSend(
 	tx := helpers.GenTx(
 		[]sdk.Msg{msg},
 		fees,
+		helpers.DefaultGenTxGas,
 		chainID,
 		[]uint64{account.GetAccountNumber()},
 		[]uint64{account.GetSequence()},
@@ -251,6 +252,7 @@ func sendMsgMultiSend(
 	tx := helpers.GenTx(
 		[]sdk.Msg{msg},
 		fees,
+		helpers.DefaultGenTxGas,
 		chainID,
 		accountNumbers,
 		sequenceNumbers,
diff --git a/x/distribution/simulation/operations.go b/x/distribution/simulation/operations.go
index 2ec483cbc1..9a9dea6b8d 100644
--- a/x/distribution/simulation/operations.go
+++ b/x/distribution/simulation/operations.go
@@ -102,6 +102,7 @@ func SimulateMsgSetWithdrawAddress(ak types.AccountKeeper, k keeper.Keeper) simu
 		tx := helpers.GenTx(
 			[]sdk.Msg{msg},
 			fees,
+			helpers.DefaultGenTxGas,
 			chainID,
 			[]uint64{account.GetAccountNumber()},
 			[]uint64{account.GetSequence()},
@@ -147,6 +148,7 @@ func SimulateMsgWithdrawDelegatorReward(ak types.AccountKeeper, k keeper.Keeper,
 		tx := helpers.GenTx(
 			[]sdk.Msg{msg},
 			fees,
+			helpers.DefaultGenTxGas,
 			chainID,
 			[]uint64{account.GetAccountNumber()},
 			[]uint64{account.GetSequence()},
@@ -195,6 +197,7 @@ func SimulateMsgWithdrawValidatorCommission(ak types.AccountKeeper, k keeper.Kee
 		tx := helpers.GenTx(
 			[]sdk.Msg{msg},
 			fees,
+			helpers.DefaultGenTxGas,
 			chainID,
 			[]uint64{account.GetAccountNumber()},
 			[]uint64{account.GetSequence()},
@@ -244,6 +247,7 @@ func SimulateMsgFundCommunityPool(ak types.AccountKeeper, k keeper.Keeper, sk st
 		tx := helpers.GenTx(
 			[]sdk.Msg{msg},
 			fees,
+			helpers.DefaultGenTxGas,
 			chainID,
 			[]uint64{account.GetAccountNumber()},
 			[]uint64{account.GetSequence()},
diff --git a/x/gov/simulation/operations.go b/x/gov/simulation/operations.go
index 4d33d82bc8..0e0bcd06f6 100644
--- a/x/gov/simulation/operations.go
+++ b/x/gov/simulation/operations.go
@@ -141,6 +141,7 @@ func SimulateSubmitProposal(
 		tx := helpers.GenTx(
 			[]sdk.Msg{msg},
 			fees,
+			helpers.DefaultGenTxGas,
 			chainID,
 			[]uint64{account.GetAccountNumber()},
 			[]uint64{account.GetSequence()},
@@ -223,6 +224,7 @@ func SimulateMsgDeposit(ak types.AccountKeeper, k keeper.Keeper) simulation.Oper
 		tx := helpers.GenTx(
 			[]sdk.Msg{msg},
 			fees,
+			helpers.DefaultGenTxGas,
 			chainID,
 			[]uint64{account.GetAccountNumber()},
 			[]uint64{account.GetSequence()},
@@ -280,6 +282,7 @@ func operationSimulateMsgVote(ak types.AccountKeeper, k keeper.Keeper,
 		tx := helpers.GenTx(
 			[]sdk.Msg{msg},
 			fees,
+			helpers.DefaultGenTxGas,
 			chainID,
 			[]uint64{account.GetAccountNumber()},
 			[]uint64{account.GetSequence()},
diff --git a/x/slashing/simulation/operations.go b/x/slashing/simulation/operations.go
index 992513c924..3e2a3bc78b 100644
--- a/x/slashing/simulation/operations.go
+++ b/x/slashing/simulation/operations.go
@@ -86,6 +86,7 @@ func SimulateMsgUnjail(ak types.AccountKeeper, k keeper.Keeper, sk stakingkeeper
 		tx := helpers.GenTx(
 			[]sdk.Msg{msg},
 			fees,
+			helpers.DefaultGenTxGas,
 			chainID,
 			[]uint64{account.GetAccountNumber()},
 			[]uint64{account.GetSequence()},
diff --git a/x/staking/simulation/operations.go b/x/staking/simulation/operations.go
index d2b2cab87d..8ddea88aa7 100644
--- a/x/staking/simulation/operations.go
+++ b/x/staking/simulation/operations.go
@@ -154,6 +154,7 @@ func SimulateMsgCreateValidator(ak types.AccountKeeper, k keeper.Keeper) simulat
 		tx := helpers.GenTx(
 			[]sdk.Msg{msg},
 			fees,
+			helpers.DefaultGenTxGas,
 			chainID,
 			[]uint64{account.GetAccountNumber()},
 			[]uint64{account.GetSequence()},
@@ -218,6 +219,7 @@ func SimulateMsgEditValidator(ak types.AccountKeeper, k keeper.Keeper) simulatio
 		tx := helpers.GenTx(
 			[]sdk.Msg{msg},
 			fees,
+			helpers.DefaultGenTxGas,
 			chainID,
 			[]uint64{account.GetAccountNumber()},
 			[]uint64{account.GetSequence()},
@@ -284,6 +286,7 @@ func SimulateMsgDelegate(ak types.AccountKeeper, k keeper.Keeper) simulation.Ope
 		tx := helpers.GenTx(
 			[]sdk.Msg{msg},
 			fees,
+			helpers.DefaultGenTxGas,
 			chainID,
 			[]uint64{account.GetAccountNumber()},
 			[]uint64{account.GetSequence()},
@@ -363,6 +366,7 @@ func SimulateMsgUndelegate(ak types.AccountKeeper, k keeper.Keeper) simulation.O
 		tx := helpers.GenTx(
 			[]sdk.Msg{msg},
 			fees,
+			helpers.DefaultGenTxGas,
 			chainID,
 			[]uint64{account.GetAccountNumber()},
 			[]uint64{account.GetSequence()},
@@ -468,6 +472,7 @@ func SimulateMsgBeginRedelegate(ak types.AccountKeeper, k keeper.Keeper) simulat
 		tx := helpers.GenTx(
 			[]sdk.Msg{msg},
 			fees,
+			helpers.DefaultGenTxGas,
 			chainID,
 			[]uint64{account.GetAccountNumber()},
 			[]uint64{account.GetSequence()},