If it's 10% Wear and Tear allowance then that is 10% of your rental income. (Not including council tax or water rates or any other utilties which you MAY have included within the rent to your tenant.) Else you can opt for replacements and renewals instead of the wear and tear allowance. Whatever you choose you need to stick with permanently. You can claim essential repairs and maintenance along with the 10% wera and tear as this is to cover things like carpets and furniture. If your house is unfurnighed you may not claim wear and tear.