UK Side-Hustle Tax Calculator
Have a job and a side business in United Kingdom? See the extra tax on your side profit, what you keep and how much of each payment to set aside, in GBP.
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Rules year: 2026 to 2027 tax year (6 April 2026 to 5 April 2027, HMRC). Estimate only, not tax, legal or financial advice. Check official guidance or a qualified professional.
Official sources
- GOV.UK: Rates and thresholds for employers 2026 to 2027 (income tax bands, Class 1 NI, mileage)
- GOV.UK: Income Tax rates and Personal Allowances
- GOV.UK: Self-employed National Insurance rates (Class 4: 6% and 2%)
- GOV.UK: VAT registration threshold (£90,000)
Free vs Pro
Free
- Extra tax caused by side income
- What you keep and the set-aside percentage
- Registration check
No account needed. Nothing you type is saved. With a free account (no card): 2 full PDF/CSV exports a month, shared across all tools.
Pro adds
- PDF and CSV export
- JSON API with your licence key
Get Pro: CA$5.00 CAD/month or CA$49.00 CAD/year · one plan for all our tools · cancel any time · secure Stripe checkout
Pro is billed in Canadian dollars: about £2.66 a month or about £26.03 a year at the Bank of Canada rate on 2026-10-21. Your card provider converts at its own rate and may add a fee.
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What would make UK Side-Hustle Tax Calculator (2026/27) more useful? Bugs, missing features, confusing wording: our R&D team reads every suggestion. Nothing is offered in return, and we never publish reviews without permission.