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HMRC internal manual

Stamp Taxes on Shares Manual

From
HM Revenue & Customs
Updated
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Introduction to Stamp Duty on shares and Stamp Duty Reserve Tax (SDRT): SDRT rates: Stamp Duty Reserve Tax - Rounding

Stamp Duty Reserve Tax liability which includes a fraction of a penny is rounded to the nearest penny (FA86/S99(13)). Where the fraction of a penny is exactly ½, the rounding is to the next whole penny above.

So an amount of tax computed to be £13.4547 is rounded to £13.45, but an amount of tax computed to be £13.4550 is rounded to £13.46.