HMRC IRmark: generic IRmark specification
Guidance for software developers on the IRmark.
PDF, 123KB, 9 pages
This file may not be suitable for users of assistive technology. Request an accessible format.
If you use assistive technology (such as a screen reader) and need a version of this document in a more accessible format, please email firstname.lastname@example.org. Please tell us what format you need. It will help us if you say what assistive technology you use.
The IRmark is a software program that helps the taxpayer prove whether the online submission held by HMRC is correct.