Two Jobs Tax Calculator
Got a second job or side hustle? See how much you actually keep after tax and NI. Your second income is taxed at your marginal rate — the results might surprise you.
You keep from 2nd job
£7,200/yr
£
£0£200k
£
£0£100k
You keep from your second job
£7,200/yr
72% of £10,000 — taxed at 28%
Combined net
£35,920/yr
£2,993/mo
Primary-only net
£28,720/yr
£2,393/mo
Tax on your second job
Second job gross£10,000/yrIncome tax on it-£2,000/yrNI on it-£800/yrYou keep£7,200/yr
Your second job is taxed at 28% because it sits on top of your primary salary — no personal allowance applies to it.
Full breakdown
| Primary only | Combined | 2nd job cost | |
|---|---|---|---|
| Gross | £35,000 | £45,000 | +£10,000 |
| Income tax | £4,486 | £6,486 | +£2,000 |
| NI | £1,794 | £2,594 | +£800 |
| Net | £28,720 | £35,920 | +£7,200 |
Things to watch out for
- Your side income exceeds £1,000 — you may need to file a self-assessment tax return.
Monthly gain
+£600
Marginal rate
28%
You keep
72%