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Side Hustle Tax Calculator (UK 2025/26)
See exactly what you'll owe HMRC on top of your day-job salary. Uses the current personal allowance, £1,000 trading allowance, and Class 4 NI rules.
Your numbers
£35,000
£0£150,000
£8,000
£0£100,000
£500
£0£50,000
Heads up: we apply the £1,000 trading allowance automatically. Numbers are estimates for 2025/26 and exclude student loans, dividends, and pension contributions.
You'll owe HMRC
£1,690
On £7,500 of side hustle profit
Income tax
£1,300
Class 4 NI
£390
Marginal rate
20%
Take-home
£5,810
Startup Edit tip
Open a separate business account and auto-pot 23% of every payment so you're never caught short come 31 January.