Self-Assessment Tax Tracker 2026/27: UK Sole Trader Income, Expenses, Mileage & Tax Estimate Spreadsheet

**Know what to set aside for tax every month, so January isn't a shock.**

For UK sole traders and side hustlers. Log income and expenses as you go, and the tracker estimates your 2026/27 income tax and Class 4 NI and how much to put aside. It also tells you whether the £1,000 trading allowance beats your actual expenses.

**What you get**

Income and Expenses logs (400 rows each) in HMRC-style expense categories, with business-use % for your phone, broadband and so on

- Mileage at 45p/25p and use-of-home flat rates

- Summary: profit, the trading allowance comparison, and income tax + Class 4 NI estimates (it can take a salary from a job into account)

- Quarterly totals in Making Tax Digital periods, and a deadlines checklist to January 2028

**Works with:** Google Sheets and Excel. England, Wales and NI rates.

**FAQ**

- *Is this MTD software?* No. It's a record-keeping and estimating tool. If MTD for Income Tax applies to you (from April 2026 for income over £50,000), you'll need HMRC-recognised software to file.

- *Is it tax advice?* No. These are estimates to help you plan.

Selling on Vinted or eBay too? See the **Vinted & eBay Seller Tracker (£5)**: https://payhip.com/b/D8alV. Or get **all 9 paid templates for £15**: https://payhip.com/b/D7IUA

**Pairs well with:** the Vinted Seller Tracker (£5) for selling income: payhip.com/b/D8alV · the Bills & Budget Planner (£7) for saving the tax bill monthly: payhip.com/b/JGDzk · or get all 9 templates for £15: payhip.com/b/D7IUA

**Free tool:** self-assessment deadline countdown: tidylife-tools.pages.dev/self-assessment-deadline-countdown/ · do I need to file a tax return?: tidylife-tools.pages.dev/do-i-need-to-file-a-tax-return/

Made with help from your friendly neighbourhood AI.