Most UK earners pay basic rate tax on the bulk of their income. Here is exactly how the 20% band works in 2025/26.
Around 28 million people in the UK pay income tax at the basic rate, making it the single most common tax rate in the country. Yet a surprising number of workers have no idea where their basic rate band starts, where it ends, or what happens the moment they cross into the higher rate territory above £50,270.
In 2025/26 the basic rate band runs from £12,571 to £50,270. Below £12,571 sits the Personal Allowance, on which you pay nothing. Above £50,270, the higher rate of 40% kicks in. The basic rate band itself is £37,700 wide, meaning a taxpayer who uses their full Personal Allowance and earns up to the higher rate threshold pays a maximum of £7,540 in basic rate income tax on that slice alone.
Scotland is a notable exception. Scottish taxpayers have their own income tax bands, with a starter rate of 19%, a Scottish basic rate of 20% and intermediate rate of 21%, all at different thresholds. The figures below apply to England, Wales and Northern Ireland.
You can map out exactly how much tax falls in the basic rate band using the salary income tax calculator, which splits your liability by band and shows your effective rate.
The mechanics are simpler than most people expect. Tax is charged on taxable income only, not gross income. Taxable income is your total earnings minus the Personal Allowance and any other allowable deductions such as pension contributions or Gift Aid payments.
Say you are a freelance graphic designer with trading profits of £38,000 in 2025/26.
| Gross trading profit | £38,000 |
| Less Personal Allowance | £12,570 |
| Taxable income | £25,430 |
| Basic rate tax at 20% | £5,086 |
| Effective overall rate | 13.4% |
Every penny of that £25,430 sits inside the basic rate band, so the calculation is straightforward. Nothing spills into higher rate. Notice also that the effective rate, 13.4% of total earnings, is considerably lower than the headline 20% because a large slice of income attracted no tax at all.
You can cross-reference your own figures against the full income tax bands guide, which covers all the rates from the starter rate through to the additional rate above £125,140.
There is an important distinction between paying tax at the basic rate and holding a BR tax code. The BR tax code is applied by HMRC when a second job, pension or other income source should not receive the benefit of the Personal Allowance, because that allowance is already being used against another income stream.
Under a BR code, your employer or pension provider deducts 20% from every pound you receive, from the first penny, with no tax-free portion. If you have a second job and your BR code is applied in error to your main employment, you will overpay tax significantly. HMRC usually corrects this through a tax code adjustment, but checking proactively can recover money faster.
One of the most persistent myths in UK tax is that earning £1 above the £50,270 threshold suddenly triggers 40% on everything. It does not. The UK system uses marginal rates: only the income above the boundary moves into the higher rate band.
If you earn £55,000 in 2025/26, your tax position looks like this:
| Income slice | Rate | Tax |
|---|---|---|
| £0 to £12,570 | 0% | £0 |
| £12,571 to £50,270 | 20% | £7,540 |
| £50,271 to £55,000 | 40% | £1,892 |
| Total income tax | £9,432 |
Your effective rate is 17.1%, not 40%. Understanding this prevents the irrational fear some people have of a pay rise nudging them just above a threshold.
If you are self-employed, you do not receive a tax code in the same way an employee does. Instead, you report your trading profits through Self Assessment, and HMRC calculates the income tax owed. Your trading profit is treated as income and falls through exactly the same bands as employment income.
The key practical difference is timing. Employees have tax deducted in real time through PAYE. Self-employed taxpayers pay income tax on their profits in arrears, typically through the 31 January payment on account deadline and a balancing payment the following July. This means a sole trader can go a year or more before their first basic rate bill arrives, which catches many people out when they first move from employment into freelancing.
Making Tax Digital for Income Tax is changing record-keeping requirements for many sole traders, but the basic rate calculation itself remains unchanged: 20% on taxable trading profits within the band.
Basic rate tax is charged on the slice of income between your Personal Allowance and £50,270. Only that slice. Not everything you earn.
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