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A simplified sole-trader estimate for the 2026/27 tax year.
Before you start: enter annual trading income before expenses and qualifying allowable business expenses. This estimates rUK Income Tax (England, Wales and Northern Ireland) and Class 4 NI only. Scotland has different Income Tax bands. This page does not apply the £1,000 trading allowance; compare that option separately and do not claim it alongside the same expenses. Other income, tax reliefs and NI circumstances can change your bill.
Editable sample: £40,000 trading income and £5,000 allowable expenses.
Trading profit after modeled Income Tax and Class 4 NI
£29,168
Excludes Class 2 payment/credit decisions, student loans, pension relief, payments on account and other income or deductions. It is not a Self Assessment calculation.
A complete valid URL takes priority over the editable example. Editing updates the URL; copied URLs contain your income and expense figures in unencrypted form. This page does not store them in browser storage. Manage separately saved FinanceTool data at Export my data.
These views recalculate the same simplified model; sensitivity examples change only the named assumption.
Annual estimate from your entered figures for 2026/27.
| Measure | 2026/27 |
|---|---|
| Taxable trading profit | £35,000 |
| Income Tax | £4,486 |
| Class 4 NI | £1,346 |
| After modeled tax and NI | £29,168 |
No expenses or other income; rUK tax bands and Class 4 thresholds held at 2026/27 values.
| Measure | Trading profit | Income Tax + Class 4 NI | After modeled charges |
|---|---|---|---|
| £20,000 | £1,932 | £18,068 | |
| £30,000 | £4,532 | £25,468 | |
| £40,000 | £7,132 | £32,868 | |
| £50,000 | £9,732 | £40,268 | |
| £75,000 | £20,189 | £54,811 | |
| £100,000 | £30,689 | £69,311 |
Holds your £40,000 trading income constant; the current expense input is included and the other expense points are illustrative. None of the points determines deductibility.
| Measure | Expenses | Taxable profit | Income Tax | Class 4 NI | After modeled charges |
|---|---|---|---|---|---|
| £0 | £40,000 | £5,486 | £1,646 | £32,868 | |
| £2,000 | £38,000 | £5,086 | £1,526 | £31,388 | |
| £5,000 | £35,000 | £4,486 | £1,346 | £29,168 | |
| £10,000 | £30,000 | £3,486 | £1,046 | £25,468 |
Website updated 10 October 2026. Income Tax excludes the Scottish bands; Class 4 thresholds/rates are UK-wide. Displayed amounts are rounded to whole pounds and may differ by £1 when separately rounded rows are compared. The result does not determine whether an expense qualifies or your Self Assessment liability.
These GOV.UK sources support the 2026/27 Income Tax, National Insurance and Self Assessment explanations. The calculator is a simplified rUK estimate.