diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7516d35b4157..8507b6b1f2ec 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 a9127a6fbd45..2341635eeea8 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 306b4259fb2d..0e6d22150255 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 9e89174e9433..71a88386c960 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 2ec483cbc1ba..9a9dea6b8d4b 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 4d33d82bc86c..0e0bcd06f600 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 992513c924d8..3e2a3bc78bad 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 d2b2cab87d04..8ddea88aa7c6 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()},