HM Revenue & Customs has encouraged Self Assessment customers to start their tax returns early rather than waiting until the 31 January 2027 deadline for the 2025 to 2026 tax year. Around 12 million people are expected to file each year, but around 5 million often leave the task until January, HMRC said.

An HMRC-commissioned survey of more than 5,200 people found 35% said they are confident they stay on top of financial admin, while more than 18% said they put it off ahead of a deadline because they lack confidence and nearly a quarter because it feels overwhelming. More than half said GOV.UK is their go-to for tax help. HMRC said customers who file now do not need to pay straight away, giving them time to plan for any tax owed.

The department noted that Winter Fuel Payment recipients in Self Assessment should see the payment pre-populated in their online return where possible and should add it manually if not shown, with those on total income over £35,000 paying it back through their tax bill. Child Benefit details for those paying the High Income Child Benefit Charge will also be pre-populated. UK cryptoasset owners must pay Capital Gains Tax on gains above the £3,000 tax-free allowance and declare it in their return.