Estimate the Income Tax and National Insurance due on your self-employed profit for the year. This is an estimate for general guidance only, not personalised tax advice — talk to Buzz for advice specific to your situation.
Profit, not turnover.
This works from your taxable profit — turnover minus allowable business expenses — not your total sales income. It assumes this is your only income and doesn't account for pension contributions, other reliefs or other income sources. Talk to Buzz for your actual figures.
Enter your estimated profit
Enter your estimated profit, then click Calculate to see an estimate.
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Rates used in this calculator (2026/27 tax year)
Income Tax band
Rate
Up to £12,570 (personal allowance)
0%
£12,571 – £50,270
20%
£50,271 – £125,140
40%
Over £125,140
45%
Class 4 National Insurance (self-employed)
Rate
Up to £12,570
0%
£12,571 – £50,270
6%
Over £50,270
2%
Class 2 National Insurance is no longer compulsory: if your profit is £7,105 or more it's treated as paid automatically (protecting your State Pension record at no cost), and below that it's only payable if you choose to pay voluntarily (£3.65/week). Not included in the total above. Source: gov.uk Income Tax rates and Self-employed National Insurance rates pages, checked July 2026.
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