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.
Set aside each month
£507.65
so the January bill never bites
Net profit
Total taxable income
Personal allowance
Income Tax
Class 4 National Insurance
Student loan repayment
Total tax & NI
Less tax already paid via PAYE
Self Assessment bill
Effective tax rate
Take-home after tax
Payment on account (each, Jan & Jul)
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
Not on sale yet — we're building it in the open. One email when it launches, nothing else.
Want the dates too? See your MTD quarterly deadlines and add them to your calendar →
This is an estimate, not tax advice. It covers a sole trader or landlord on the standard UK-wide rates for 2026/27; Scottish Income Tax bands differ. It does not handle every situation — capital gains, dividends, marriage allowance or the high-income child benefit charge, for example. For anything complex, check gov.uk or speak to an accountant.