Self Assessment Deadline 2026 Explained
What the 2026 Self Assessment deadlines mean, which tax year they apply to, and the key dates sole traders and landlords usually need to track.
Audience: Sole traders and landlords
Last reviewed: 16 March 2026
Guides
Each guide includes source-backed deadlines, official references, a last reviewed date, internal links and a clear disclaimer so the pages can work as practical starting points rather than vague blog posts.
What the 2026 Self Assessment deadlines mean, which tax year they apply to, and the key dates sole traders and landlords usually need to track.
Audience: Sole traders and landlords
Last reviewed: 16 March 2026
A clear guide to the 5 October registration deadline, who it affects, and how it fits with filing your first return.
Audience: New sole traders and landlords
Last reviewed: 16 March 2026
The core deadlines small UK limited companies usually track, including accounts, Corporation Tax, and confirmation statements.
Audience: Small limited company directors
Last reviewed: 16 March 2026
What a confirmation statement does, when it is due, and why it is different from annual accounts.
Audience: Limited company directors
Last reviewed: 16 March 2026
A plain-English guide to when Corporation Tax is usually due, when the Company Tax Return must be filed, and why those deadlines differ.
Audience: Limited company directors
Last reviewed: 16 March 2026
How UK VAT return deadlines usually work, when payment is due, and the timing rule most VAT-registered businesses need to know.
Audience: VAT-registered businesses
Last reviewed: 16 March 2026
What Making Tax Digital for Income Tax means for sole traders and landlords, including the staged start dates announced by HMRC.
Audience: Sole traders and landlords
Last reviewed: 16 March 2026
A practical guide to the Companies House identity verification rollout and what directors should watch on future filings.
Audience: Directors and people filing for companies
Last reviewed: 16 March 2026
The main dates landlords usually need to watch for Self Assessment, payments on account, and Making Tax Digital for Income Tax.
Audience: Landlords
Last reviewed: 16 March 2026
A practical look at whether a sole trader must use an accountant, when doing it yourself may be realistic, and when extra support can help.
Audience: Sole traders
Last reviewed: 16 March 2026
The practical steps to register for Self Assessment, when to start, and what information HMRC usually asks for.
Audience: New sole traders and first-time filers
Last reviewed: 16 March 2026
What HMRC says about late filing penalties, late payment charges, and why delay becomes more expensive the longer it continues.
Audience: Self Assessment taxpayers
Last reviewed: 16 March 2026