See an estimate alongside your business records. TaxSnapper uses the information you enter to help you plan what to set aside.
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Try the free tax calculator →Illustrative tax + Class 4 NI
£5,051.80
Worked example, not an app screenshot or personal result. Full-year sole-trader income only, standard Personal Allowance, Class 4 NI applies. England, Wales and Northern Ireland. No other reliefs, mileage deduction or CIS credit.
Record income, keep expenses and receipts together, and check your estimated tax.
The app is coming soon. Download links will appear at launch.
Your turnover is not your profit, and your profit is not your tax bill. TaxSnapper works through the supported information you enter for the tax year.
For CIS work, record gross income separately from the tax your contractor deducted.
Allowable expenses and eligible business mileage relief reduce the profit used. Do not count the same vehicle costs twice.
The relevant Personal Allowance and Income Tax bands are applied to the supported information entered.
Class 4 NI is calculated on self-employed profit. Recorded CIS deductions are tax already paid, rather than a business expense.
A contractor’s CIS deduction is a payment towards your tax position. It does not reduce your gross business income when calculating profit.
Read HMRC’s CIS guidance →Same assumptions as above. Actual deductions must match your records. Other payments and liabilities can change the balance. A credit is not a guaranteed HMRC refund.
Use the free website calculator for a one-off illustration. For an estimate grounded in your ongoing business records, keep your relevant income and costs up to date in TaxSnapper.
Both provide estimates. A more complete record gives you a more useful basis; neither guarantees your final tax bill.
2026/27 rates for England, Wales and Northern Ireland: standard Personal Allowance £12,570; Income Tax bands at 20%, 40% and 45%. The allowance tapers above £100,000 adjusted net income. Class 4 NI is 6% on profits above £12,570 up to £50,270, then 2% above, where liable. Scottish bands differ. HMRC Income Tax rates · HMRC NI rates. Rates checked 15 October 2026.
No. It is a guide based on your records and the circumstances the app supports. Other income, pensions, student loans, reliefs and tax already paid may affect your actual position. Review your complete position before filing or paying.
No. You decide what to reserve and manage the money yourself. TaxSnapper does not move funds, pay HMRC, submit tax returns or submit MTD updates.
The website calculator gives a one-off illustration. The app keeps your recorded income, expenses and receipt photos together, so you can review an estimate with the information behind it.
