If your income crosses £125,140 in 2025/26, nearly half of every extra pound you earn goes to HMRC. Here is what that means in practice.
Cross the £125,140 threshold and HMRC takes 45 pence from every additional pound of income, with no Personal Allowance left to cushion you. That threshold has been frozen since April 2023, so more people drift into the additional rate band each year through pay rises alone, a process sometimes called fiscal drag.
The additional rate threshold sits at £125,140 for 2025/26. That is not a coincidence: it is precisely the income level at which the Personal Allowance taper, which removes £1 of allowance for every £2 of income above £100,000, has wiped your entire tax-free allowance to zero. Below £125,140 but above £100,000 you face a 60% effective marginal rate on earnings in that band because you are losing allowance at the same time as paying higher rate tax. Once you pass £125,140 the rate drops back to 45%, which is a surreal relief after the 60% trap, but it is still the highest standard income tax rate in the UK system.
For context, the full picture of UK income tax bands in 2025/26 for England, Wales and Northern Ireland looks like this:
| Band | Taxable income | Rate |
|---|---|---|
| Personal Allowance | Up to £12,570 | 0% |
| Basic rate | £12,571 to £50,270 | 20% |
| Higher rate | £50,271 to £125,140 | 40% |
| Additional rate | Over £125,140 | 45% |
Scottish taxpayers have a different structure with a top rate of 48%, but that is governed by the Scottish rate of income tax, not this band.
Imagine a sole trader consultant, Priya, who earns £160,000 in net profit during 2025/26. Here is how her income tax bill breaks down (simplified, ignoring National Insurance and any reliefs):
| Slice of income | Rate | Tax |
|---|---|---|
| £0 to £12,570 (Personal Allowance) | 0% | £0 |
| £12,571 to £50,270 | 20% | £7,540 |
| £50,271 to £125,140 | 40% | £29,948 |
| £125,141 to £160,000 | 45% | £15,687 |
| Total income tax | £53,175 |
That gives Priya an effective overall rate of roughly 33%, which is meaningfully lower than 45%, because the higher rates only apply to slices of income, not the whole amount. Use the income tax calculator for salary and self-employed income to model your own figures rather than guessing.
The collection method depends on how you earn the income.
If you are employed and your employer's payroll identifies you as an additional rate taxpayer, HMRC will issue a D1 tax code against that employment. The D1 code instructs your employer to deduct 45% from all income through that payroll, with no personal allowance applied. If you have multiple jobs or income sources, HMRC may assign D1 to a secondary source while your primary employment carries a different code.
If your profits push you above £125,140, you declare everything through Self Assessment and pay the resulting bill in two payments on account (31 January and 31 July) plus a balancing payment. There is no automatic payroll deduction, which means the cash can feel available right up until the payment deadline. Setting aside at least 45% of every pound earned above £125,140 into a separate account from day one prevents a nasty surprise in January.
Paying 45% is not inevitable even if your gross income clears £125,140.
Pension contributions are the most powerful tool. Contributions to a registered pension scheme attract tax relief at your marginal rate. A sole trader making a £10,000 pension contribution reduces their taxable income by £10,000, saving £4,500 in additional rate tax plus recovering some of the Personal Allowance taper if the contribution pulls income back below £125,140.
Gift Aid donations work similarly. When you donate to charity via Gift Aid, the charity reclaims basic rate relief at 20%, but you can claim the difference between 45% and 20% through Self Assessment, effectively reducing the net cost of a £1,000 donation to £550.
Timing income is a legitimate planning consideration for sole traders. If you are close to the threshold, deferring invoices into the next tax year, where possible, can keep you below the band in a given year. Accelerating allowable business expenses into the current year achieves a similar effect.
None of these approaches involve artificial schemes; they are part of the tax system by design.
It is worth flagging clearly: Scottish residents do not pay 45% additional rate tax. Scotland's top rate is 48% on income above £125,140 (the advanced rate in Scotland's five-band structure). If you live in Scotland and see references to the 45% rate, it does not apply to your earned income, though it may still apply to savings income and dividends, which use UK-wide rates.
The additional rate is not just for bankers and executives; a good year for a freelance consultant or a property investor can push almost anyone above £125,140, and the tax bill that follows is genuinely large.
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