It comes as the tax authority already received 950,000 online self assessment returns so far this tax year.
HMRC has said it has seen a “growing trend” in early filers. In the last five tax years, the number of customers choosing to file on the first day of the new tax year has almost trebled from 22,885 in 2017 to 63,521 in 2021.
To help those who have still not submitted, the authority has published information to help customers file early. The information which is available online provides guidance on how to do it, benefits and what customers “need to get started”.
Myrtle Lloyd, director general for customer services at HMRC, said: “There are many advantages to completing your self assessment tax return sooner rather than later, not least that if you’re due tax refund you’ll get the money within a few days.
“Our new online guide helps answer many of the questions customers have about self assessment. Go to GOV.UK and search ‘file your tax return early.”