if you are buying a property to rent the stamp duty is also charged at a higher rate
Property Price. ...........Stamp Duty ..........Buy to Let/ Additional Home Rate*
£0 - £125,000. ................0%. .......................3%
£125,001 - £250,000. .....2%......................... 5%
£250,001 - £925,000. .....5%......................... 8%
£925,001 - £1,500,000. .10%....................... 13%
There are calculators online that you can use if you want