Start Something · Calculator
Side hustle tax
What you keep from side income on top of your job, 2026/27.
Materials, fees, postage
Small print
You can deduct either the £1,000 trading allowance or your actual costs — whichever is bigger, not both. Uses 2026/27 income tax (England, Wales and Northern Ireland) and Class 4 National Insurance at 6% on self-employed profits between £12,570 and £50,270, 2% above. Ignores student loan, which can also apply to side income.
TL;DRUnder £1,000 of side income a year, there’s nothing to declare. Above it, you pay tax on the profit at your normal rate.
Taxable profit—
Extra income tax—
Class 4 National Insurance—
You keep from the side hustle—