26/08/2026
Started working for yourself this year? There's a deadline coming most people don't know about.
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5 October β that's when you tell HMRC you'll be filing a tax return, if you've never filed one before.
Is this you?
π· Started as a subbie
π» Went self-employed
π Started renting out a property
π· Took in money HMRC hasn't taxed
Already filed a return before? Then this one isn't for you.
How it works
1οΈβ£ You register online
2οΈβ£ HMRC posts your UTR, and an activation code follows β usually within 7 working days
3οΈβ£ You file by 31 January using those details
The letters come by post. The code letter looks like junk mail and people bin it. Without it you can't file.
The bit nobody mentions: registering as a sole trader also signs you up for Class 2 National Insurance β which builds your State Pension record. Stay unregistered and those years just don't count.
And yes β you register even if you earned very little. Low profits don't excuse you.
Leave it late: Β£100 the day your return is late, then Β£10 a day after 3 months (up to Β£900), then after 6 months 5% of the tax or Β£300. The Β£100 lands even if you owe nothing.
Rather not deal with it? We register you, chase the paperwork, and file on time.
π§ [email protected] π taxboxconsulting.co.uk