Overview
- HMRC is urging first-time filers to use its online checker to confirm if they need to submit a return, and the tool does not send personal details to the department.
- People who typically must register include self‑employed workers earning over £1,000, business partners, those liable for Capital Gains Tax, and anyone with untaxed income such as rent, tips or foreign income.
- Missing the registration date can lead to a failure‑to‑notify penalty, though paying any tax due in full by 31 January may reduce that penalty to nil.
- Late-filing fines escalate: £100 initially, then £10 per day after three months (up to £900), plus a further £300 or 5% at six months and again at 12 months.
- Planned Making Tax Digital changes from April 2026 will move to multiple submissions each year with a points‑based penalty regime and quicker late‑payment penalties.