UK First Year Self Employed Tax Planner 2026/27

Why this one

The first tax bill is the one that hurts, because it is not one bill. If you owe more than £1,000 you pay that year’s tax plus half of next year’s on account in January, then the other half in July. People budget for the first number and get hit by all three. This workbook projects all of it from your actual figures, month by month, so January is a date rather than a shock.

What you get

• One Excel workbook (.xlsx) with 12 tabs: Start Here, Dashboard, Settings, Income, Expenses, Mileage, Home Working, Quarterly Summary, January Bill, Tax Estimate, Rates 2026-27, Lists
• A quick start guide (PDF) with instructions for Excel and for Google Sheets
• Income and expense categories written for your trade, not a generic list
• A dashboard showing profit, tax to set aside and where the money went
• A sourced rates tab listing every figure with the GOV.UK page it came from

Built for the 2026/27 UK tax year

Every figure is for the 2026/27 tax year and sits on its own tab with the GOV.UK page it came from, so you can check our working.

• Mileage at 55p for the first 10,000 miles, then 25p. This rose from 45p and was backdated to 6 April 2026, so older templates under-claim.
• Personal allowance of £12,570, with the taper above £100,000
• Income tax for England, Wales and Northern Ireland, and all six Scottish bands from 19% to 48%
• Class 4 National Insurance at 6% and 2%, and the Class 2 position
• Working from home flat rates of £10, £18 and £26 a month
• Expense categories matching the boxes on the HMRC self-employment pages, so nothing needs re-sorting in January
• Making Tax Digital quarter dates: 7 Aug 2026, 7 Nov 2026, 7 Feb 2027 and 7 May 2027

Need more than one? This is also in the UK New Business Starter Bundle 2026/27 (£23.99) — the same files at a lower price than buying them one by one.

Questions