
1 
These Regulations may be cited as the Taxes (Interest Rate) (Amendment No. 3) Regulations 1993 and shall come into force on 1st October 1993.
2 
After regulation 3 of the Taxes (Interest Rate) Regulations 1989 there shall be inserted–“
3A 

(1) For the purposes of section 87A of the Taxes Management Act 1970, the rate applicable under section 178 shall, subject to paragraph (2), be 6.25 per cent. per annum.
(2) Where, on a reference date after 1st October 1993, the reference rate found on that date differs from the established rate, the rate applicable under section 178 for the purposes of the enactment referred to in paragraph (1) shall, on and after the next operative date, be the percentage per annum found by applying the formula specified in paragraph (3) and, if the result is not a multiple of one–quarter, rounding the result down to the nearest amount which is such a multiple.
(3) The formula specified in this paragraph is–(RR+2.5)(100-SCR),100where
 RR is the reference rate referred to in paragraph (2) and SCR is the percentage at which corporation tax at the small companies' rate is charged for the financial year in which the reference date referred to in that paragraph falls.
3B 

(1) For the purposes of section 826 of the Income and Corporation Taxes Act 1988, the rate applicable under section 178 shall, subject to paragraph (2), be 3.25 per cent. per annum.
(2) Where, on a reference date after 1st October 1993, the reference rate found on that date differs from the established rate, the rate applicable under section 178 for the purposes of the enactment referred to in paragraph (1) shall, on and after the next operative date, be the percentage per annum found by applying the formula specified in paragraph (3) and, if the result is not a multiple of one–quarter, rounding the result down to the nearest amount which is such a multiple.
(3) The formula specified in this paragraph is–(RR-1)(100-CTR),100where
 RR is the reference rate referred to in paragraph (2) and CTR is the percentage at which corporation tax is charged for the financial year in which the reference date referred to in that paragraph falls.”
Kenneth Clarke
Irvine Patnick
Two of the Lords Commissioners of Her Majesty’s Treasury
8th September 1993