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UK Self Assessment Spreadsheet 2025/26 | Tax Return Tracker for Side Hustles (Digital Download)

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Highlights

  • Designed by UkMoneySheets
  • Party decor for gatherings and celebrations
  • Digital download
  • Digital file type(s): 1 PDF

Get your 2025/26 Self Assessment figures ready without the January panic. Log your side hustle income, expenses, mileage and home office costs, and this UK Google Sheet gives you the SA103 numbers for your tax return plus an estimate of the tax due. Online filing deadline: 31 January 2027.

Organise your side-business income and expenses for the 2025/26 tax year, covering 6 April 2025 to 5 April 2026. Use the Google Sheets summaries to prepare your records for Self Assessment.



This sheet is for income already earned in the last tax year: 6 April 2025 - 5 April 2026. Online filing deadline: 31 January 2027. If you sold on Etsy, eBay or Vinted, drove, or freelanced last year and have not sat down with the return yet, this is the one.

It is not the sheet for income you are earning this year. Current-year tracking is the 2026/27 edition. Need both? The both-years bundle is cheaper than buying them separately.

WHAT'S INSIDE (10 TABS)
- Income log — every payment, every platform
- Expense tracker — HMRC-allowable categories with dropdowns
- Tax calculator — layered on your PAYE salary at 2025/26 rates
- Trading Allowance (£1,000) vs actual expenses — the sheet picks whichever saves more
- Mileage log — 45p / 25p HMRC rates
- Home office calculator — simplified flat rate or actual costs
- Quarterly summaries, professional P&L, SA100/SA103 box mapping

WHICH EDITION DO I NEED?
- THIS ONE (2025/26) — income 6 Apr 2025 - 5 Apr 2026, file by 31 January 2027
- 2026/27 edition — income you are earning now (see the shop)
- Both-years bundle — file last year and track this year (see the shop)

WHAT YOU RECEIVE
- Instant digital download
- A PDF with your private Google Sheets link — File > Make a copy to your own Drive
- Instructions tab + 2025/26 HMRC rules summary
- Works in any browser with a free Google account

Digital download — nothing is posted. Estimation tool only, not tax advice. Verify with HMRC or a qualified accountant. No refunds once the file has been downloaded.

Free tip: we published two short UK guides that pair with this self-assessment sheet — https://ukmoneysheets-site.vercel.app/guides/uk-self-assessment-side-hustle-sa103/ and https://ukmoneysheets-site.vercel.app/guides/register-self-assessment-5-october/

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