Stamp duty is a state tax that is levied on the sale of property.  The rate of stamp duty that you’ll have to pay varies from state to state, so there’s no hard and fast answer about how much you’ll have to pay. Just as the stamp duty rate changes from state to state, so does the timeframe in which you need to pay it. You can use Savvy's stamp duty calculator to work out how much it'll cost you in your state.