Land and Buildings Transaction Tax (LBTT) has replaced Stamp Duty in Scotland. If you’re buying a residential property over £145,000, you’ll have to pay LBTT. This calculator works out how much Land and Buildings Transaction Tax you need to pay on your new property. It also works out how much you’ll pay on any additional property purchase over £40,000, like a buy to let or second home, which attracts an extra 4% Additional Dwelling Supplement (ADS).