http://www.legislation.gov.uk/uksi/1987/1494/contents/made
The Stamp Duty Reserve Tax (Interest on Tax Repaid) (No. 3) Order 1987
Stamp duties
Tax
King's Printer of Acts of Parliament
2011-07-04
TAXES
Section 92 of the Finance Act 1986 provides that, if certain conditions have been fulfilled and a claim for repayment is made within the stipulated period, stamp duty reserve tax shall be repaid. Where the tax paid is not less than £25, it shall be repaid with interest at the appropriate rate. The section defines the “appropriate rate” as 11 per cent. per annum or such rate as the Treasury may from time to time specify by order.