UK Self Assessment Tax Calculator 2026
Get a complete picture of your tax position. Estimate income tax, National Insurance (Class 1, 2, and 4), dividend tax, savings interest tax, and student loan repayments all in one place.
How self assessment works
You must file a Self Assessment tax return if you're self-employed, a company director, have untaxed income above £1,000, or need to claim certain reliefs. The tax year runs from 6 April to 5 April. Returns must be filed online by 31 January following the end of the tax year, with any tax due paid by the same date. Payments on account may be required if your tax bill exceeds £1,000.
UK Self Assessment Tax Calculator 2026 — Estimate Your Tax Bill Free
Free UK self assessment tax calculator. Estimate income tax, National Insurance, dividend tax, and student loan repayments for 2026/27. Plan your payments on account.
Tax Breakdown
2026/27 tax rates at a glance
Income tax: 0% on first £12,570, 20% on £12,571-£50,270, 40% on £50,271-£125,140, 45% above £125,140. National Insurance: Employee 8%/2%, self-employed Class 2 £179.40/yr, Class 4 9%/2%. Dividend tax: 8.75% basic, 33.75% higher, 39.35% additional (first £500 tax-free). Personal Savings Allowance: £1,000 (basic), £500 (higher), £0 (additional).