The Income Tax (Interest on Unpaid Tax and Repayment Supplement) (No. 3) Order 1987
On and after 6th September 1987 this Order increases from 8.25 per cent. per annum to 9 per cent. per annum the rate of interest chargeable on unpaid income tax, surtax, capital gains tax, corporation tax (including advance corporation tax), development land tax, petroleum revenue tax, profits tax, excess profits tax, excess profits levy and on overpaid development land tax. The Order also provides that on and after 6th September 1987 supplement on repayments of income tax, surtax, capital gains tax and corporation tax (including advance corporation tax) will be at the rate of 9 per cent. per annum instead of 8.25 per cent. per annum.