Tax deadlines · UK
UK deadline to register for Self Assessment
For anyone who became chargeable in the tax year that ended the previous April and is not already registered.
This is a statutory date, not tax advice. Deadlines move for extensions, agents, weekends and public holidays, and they differ by circumstance. Check with HMRC or a qualified adviser before relying on it.
Cryptominium is not a tax adviser and nothing here is tax advice. Deadlines shift for extensions, agents, weekends and public holidays, and what you owe depends on circumstances this page knows nothing about. Confirm with the authority named below, or with somebody qualified, before you rely on any of it.
Where this came from
Checked against those sources by a person on 23 September 2026. A curated calendar’s only claim to trust is that somebody looked.