Self Assessment Tax Estimator

Self-employed or earning outside of PAYE? Estimate your Self Assessment tax bill for 2025/26 — including payments on account — so you’re not caught short when the deadline hits.

How to use this calculator

Enter income from all sources.
See your total tax bill and payments on account.

PAYE employment income (£)

Self-employed profit (£)

Rental income (£)

Dividends (£)

Savings interest (£)

Total Self Assessment bill

£0.00

	Amount
Total taxable income	–
Income tax	–
Class 2 NI	–
Class 4 NI	–
Total tax bill	–
1st payment on account (31 Jan)	–
2nd payment on account (31 Jul)	–
Save per month	–

Estimating Your Self Assessment Tax Bill

If you’re self-employed, a landlord, or have multiple income sources, you’ll likely need to file a Self Assessment tax return. This calculator estimates your total tax bill including income tax, NI and any payments on account.

Multiple Income Sources

Self Assessment combines all your income: PAYE employment, self-employed profits, rental income, dividends and savings interest. The total determines your tax band and overall liability.

Payments on Account

If your tax bill exceeds £1,000 (and less than 80% was collected at source), HMRC requires payments on account — two advance payments towards next year’s bill, each equal to 50% of your previous year’s total. These are due on 31 January and 31 July.