Stamp Duty Land Tax: generic technical specifications

Guidance for Stamp Tax Online software developers on Government Gateway, HMRCIRmark and stamps taxes.


Transaction Engine: Support for software developers

HMRC(IR)mark: support for software developers


Generic technical specifications for Stamp Tax Online software developers.

Published 1 January 2014
Last updated 22 March 2018 + show all updates
  1. The stamp taxes help chart has been removed as the information is out of date and no longer required.
  2. First published.