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UK Tax Assistant

Effortless tax & NI calculations for the self-employed

A friendly web app that helps self-employed individuals across the UK estimate Income Tax and National Insurance contributions in seconds — no spreadsheets, no jargon.

Launch UK Tax Assistant

Opens uktaxassistant.com in a new tab

Built for

Self-employed professionals, freelancers, and sole traders in the UK

Key features

Accurate Income Tax & National Insurance calculations
Built around the latest UK tax bands and thresholds
Clean, mobile-friendly interface
14-day free trial — no payment details needed to start

How it helps

Tax shouldn't be a headache.

UK Tax Assistant takes the guesswork out of self-assessment. Enter your earnings and get an instant, clear breakdown of what you owe — so you can plan ahead with confidence.

Disclaimer: UK Tax Assistant is an independent tool provided by Stani Software. It is not affiliated with, endorsed by, or connected to HMRC or the UK Government. Calculations are estimates for guidance only and should not be relied upon as professional tax advice.

Instant calculations

Enter your income and see Income Tax + NI broken down in real time.

UK-specific bands

Built around the latest HMRC tax thresholds and National Insurance rates.

Save hours

No spreadsheets. No accountant call. Just answers when you need them.

Get in touch

Have feedback or feature requests?

We're always improving our apps based on what real users need. Drop us a line — we read every message.