The HMRC project has passed the Digital by Default Service Standard Assessment
A GDS Transformation blog said taxpayers can now access the service through their online tax dashboards, and that it can make self-assessment fully digital for about 10 million people.
The service has been designed to reduce the need for paper tax statements. HMRC has said it could save it sending 2.5 million letters per year and produce annual financial savings of £800,000.
The project has been one of the exemplars in the government's Digital by Default programme. The blog said that since it went to the public beta phase it has encouraged 1.24 million taxpayers to opt in to paperless correspondence and has so far prevented the need for 430,000 pieces of post.
In last week's Budget, Chancellor George Osborne announced more ambitious plans to replace self-assessment tax returns with automatic uploads of information about taxpayers' income.
Pictured: HMRC by Paul Clarke © | paulclarke.com