Business Tools

Self-Assessment Tax Estimator

Get an instant estimate of your Income Tax and National Insurance before the January self-assessment deadline. Enter your income and expenses below.

Back

2025/26 Tax Year Estimate

Based on HMRC rates: Personal Allowance £12,570 • Basic rate 20% • Higher rate 40% above £50,270

Self-employed income (£) Your total trading income before expenses

Business expenses (£) Allowable expenses (subtract from income)

Other employment income (£) PAYE salary from a job (if any)

Pension contributions (£) Personal pension payments (relief at source)

On account payments: If your Self Assessment bill is over £1,000, HMRC will ask you to make two payments on account (31 Jan and 31 Jul) each equal to half your bill. Factor this into your cash flow.

Estimate only. This tool does not account for all allowances, reliefs, or individual circumstances. Always verify with a qualified accountant before filing your return. HMRC rates used: 2025/26 tax year.