UK Tax Assistant
Estimate your UK Income Tax & National Insurance in seconds
A simple, mobile-friendly web app that helps self-employed people, freelancers and sole traders across the UK get a clear estimate of their Income Tax and National Insurance — without spreadsheets or jargon.
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Built for
Self-employed professionals, freelancers and sole traders in the UK
Key features
- Estimate Income Tax and National Insurance in seconds
- Built for UK self-employed people, freelancers and sole traders
- Clear breakdowns — no spreadsheets, no jargon
- Mobile-first, works beautifully on any device
- 14-day free trial — no payment details needed to start
How it works
Three simple steps.
No spreadsheets, no jargon — just a clear estimate in seconds.
1. Enter your income
Add your self-employment income (and any other relevant figures). It only takes a moment.
2. Review your estimate
See your estimated Income Tax and National Insurance, broken down clearly by band.
3. Plan ahead with confidence
Use the breakdown to set money aside, plan tax payments, and avoid nasty surprises.
Why use it?
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 might owe — so you can plan ahead with confidence.
Fast
Get an estimate in seconds — no spreadsheets, no setup.
Simple
Plain-English breakdowns of Income Tax and National Insurance.
UK-specific
Built around UK tax bands and National Insurance thresholds.
Mobile-friendly
Works beautifully on your phone, tablet or desktop.
Tax year: Uses UK tax rates and thresholds for the 2026/27 tax year. Last reviewed: April 2026.
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.
FAQ
Common questions.
Is UK Tax Assistant affiliated with HMRC?
No. UK Tax Assistant is an independent tool built by Stani Software. It is not affiliated with, endorsed by, or connected to HMRC or the UK Government in any way.
Is this tax advice?
No. UK Tax Assistant gives estimates for general guidance only. It is not a substitute for professional tax advice. For decisions that affect your tax liability, please speak to a qualified accountant or tax adviser.
Who is this app for?
It's designed for self-employed people, freelancers and sole traders in the UK who want a quick, clear estimate of their Income Tax and National Insurance without wrestling with spreadsheets.
Do I need to enter payment details for the free trial?
No. You can try UK Tax Assistant free for 14 days without entering any payment details. We'll only ask for them if you choose to continue after the trial.
Are my figures stored?
We aim to be privacy-conscious by design and only store what's needed to make the app work for you. For full details, please see our Privacy page.
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.