How to complete your Self Assessment (step by step)
A no-jargon walkthrough of registering, gathering your numbers, and filing your return online with HMRC.
No legal-speak. Field-tested guides, a jargon buster, hidden income routes and the UK HMRC calendar — built for trainers and community coaches going self-employed.
Brand build
From idea to first sale — manufacturing, branding, online sales + AI business plan generator.
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Build a YouTube, podcast or social presence around your lived experience — and get paid for it.
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Coach with credibility — peer-support, community work and storytelling pathways for trainers with lived experience.
Read the guideTax year 2026/27 · live countdown to your next filings & payments.
Corporation Tax and Confirmation Statement deadlines recalculate from your selected dates.
9 deadlines shown
Annual filing with Companies House — due within 14 days of your incorporation anniversary (12 May).
Tue, 12 May 2026
Quarterly VAT return — due the 7th of the second month after the quarter end.
Fri, 7 August 2026
Due 9 months + 1 day after your company year end (31 March 2026).
Fri, 1 January 2027
Register with HMRC by 5 October 2027 if you became self-employed in tax year 2026/27.
Tue, 5 October 2027
Deadline for filing a paper Self Assessment return for tax year 2026/27.
Sun, 31 October 2027
Deadline for filing your Self Assessment online for tax year 2026/27.
Mon, 31 January 2028
Pay any tax owed for tax year 2026/27.
Mon, 31 January 2028
First payment on account toward next year's tax bill.
Mon, 31 January 2028
Second payment on account toward next year's tax bill.
Mon, 31 July 2028
General guidance only — confirm exact dates with HMRC and Companies House.
Plain-English answers to the questions self-employed PTs ask most.
6 guides
A no-jargon walkthrough of registering, gathering your numbers, and filing your return online with HMRC.
Why HMRC asks for advance payments and how to plan for the shock of your first one.
Setting up a Community Interest Company if your coaching has a clear social purpose.
The classic 'low salary, top up with dividends' approach most one-person LTDs use to keep tax efficient.
The everyday costs personal trainers can deduct — and the common ones that aren't allowable.
How to decide between staying a sole trader and incorporating, with the rough income point most PTs benefit from switching.
The tax and business words you'll hear as a self-employed coach, explained in plain English.