Your figures
Nothing is sent anywhere. This runs entirely in your browser — there is no account, no email, and no data leaves your device.
Other income, pension, student loan
Your estimate for 2026/27
England, Wales & Northern Ireland rates. Updates as you type.
Need to actually keep the records, not just estimate the bill?
The Fableworks HQ MTD toolkit — the same verified maths, in spreadsheets you own.
- Self Assessment Tax Estimator — this calculator, as a working Excel & Google Sheets file
- Freelancer Invoice Tracker — live Paid / Outstanding / Overdue status and a chase list
- Day-Rate & Profit Calculator — works backwards from the take-home you want
- Rental Property ROI & Yield Calculator — yields, cash flow and Section 24
£9 each, or all four for £19. Instant download, 14-day money-back guarantee.
Want the dates too? See your MTD quarterly deadlines and add them to your calendar →
Drive for work? Work out your mileage claim at 55p/mile before you enter expenses →
Profits growing? Compare sole trader vs limited company take-home for 2026/27 →
Turnover heading past £90,000? Check whether you need to register for VAT →
Common questions
When do I need to register for Self Assessment?
If your self-employment income is over £1,000 in a tax year (the trading allowance), you must tell HMRC and register by 5 October following the end of that tax year.
How much tax will I pay on self-employment income?
Income Tax at 20%, 40% or 45% on profit above your personal allowance, plus Class 4 National Insurance on profit above £12,570. This calculator works out both for 2026/27.
What is the personal allowance for 2026/27?
£12,570. It's reduced by £1 for every £2 you earn over £100,000 and disappears entirely at £125,140.
When is the Self Assessment deadline?
Pay and file online by 31 January after the tax year ends. A paper return is due earlier, by 31 October.
Do I still pay Class 2 National Insurance?
Class 2 NIC is no longer payable if your profits are above the small-profits threshold — it's treated as paid. You still pay Class 4 on profit above £12,570 (6% up to £50,270, then 2%).