Overview
- HMRC reports over 6.36 million returns already filed, leaving roughly 5.6 million still due for the 2024/25 tax year covering 6 April 2024 to 5 April 2025.
- Missing the 31 January filing deadline triggers a £100 fixed penalty even if no tax is due or it is paid on time.
- Further sanctions include £10 daily penalties after three months and additional charges of 5% of tax due or £300 at six and 12 months.
- Unpaid balances accrue 7.75% interest from the deadline plus late-payment surcharges of 5% at 30 days, six months and 12 months.
- Those who must file commonly include self‑employed people earning over £1,000, higher‑rate taxpayers and those with significant untaxed income, with HMRC’s online portal and app allowing users to start, save and set reminders.