How Does UK Income Tax Work in 2025/26 and 2026/27?

Introduction

Income tax is the single largest source of revenue for the UK Exchequer, raising roughly £300 billion a year and funding everything from the NHS to national defence. Yet despite its scale, it remains one of the most misunderstood taxes in the country. Every year, millions of employees, pensioners, landlords, freelancers and investors pay more than they need to — or panic about owing more than they do — simply because the system is layered, jargon-heavy, and changes at least once a year.

This guide is a plain-English walk-through of how UK income tax works in the 2025/26 and 2026/27 tax years. It explains the tax year, the personal allowance, the income tax bands, the difference between the rest of the UK and Scotland, how PAYE works, what tax codes mean, and how to work out the tax bill on a mix of salary, savings, dividends, pension and rental income. It finishes with case studies, the most common mistakes HMRC sees, and a practical look at what is likely to change in the years ahead.

The rates quoted are those confirmed by HMRC for the 2025/26 tax year (6 April 2025 to 5 April 2026). The UK government has stated that the main income tax thresholds are frozen until April 2028, so most 2026/27 figures should match — but Autumn 2025 Budget changes and any Spring 2026 announcements may alter specific figures, and readers should always verify the live numbers on GOV.UK before filing.

What Is UK Income Tax?

Income tax is a tax on income — the money you receive from working, saving, investing or holding property. It is administered by HM Revenue & Customs (HMRC) and collected in one of two main ways: automatically through Pay As You Earn (PAYE) if you are an employee or pensioner, or through Self-Assessment if you have income that PAYE cannot capture.

It is a progressive tax. That means different slices of your income are taxed at different rates, with higher slices taxed at higher rates. A common myth is that a pay rise can push you into a higher bracket and make you worse off overall. It cannot. Only the portion of your income that falls inside the higher band is taxed at the higher rate, so an extra pound earned always leaves you with more money in your pocket — just slightly less than a pound of it.

Who Pays UK Income Tax?

You are liable to UK income tax if you are a UK tax resident. Residency is determined by the Statutory Residence Test (SRT), which looks at how many days you spend in the UK, whether you have a home here, family ties, work ties and other factors. If you are UK resident, you are generally taxed on your worldwide income. If you are non-resident, you are only taxed on income arising in the UK.

People who are UK resident but not UK domiciled have historically had access to the “remittance basis”, which allowed them to keep foreign income outside UK tax so long as it was not brought to the UK. This regime was substantially reformed by the 2024 Budget and replaced with a new four-year residence-based regime from 6 April 2025. New arrivals to the UK who have been non-resident for the previous ten years can claim exemption on foreign income and gains for their first four years of UK residence. The old “non-dom” concept is being phased out.

The UK Tax Year

The UK tax year runs from 6 April in one year to 5 April the next. So the 2025/26 tax year covers 6 April 2025 to 5 April 2026, and the 2026/27 tax year covers 6 April 2026 to 5 April 2027. All the allowances, rates and thresholds reset at the start of each tax year. The quirky April-to-April timing is a historical legacy of the Julian-to-Gregorian calendar switch in 1752 and has never been modernised.

Important filing dates tied to the tax year include:

• 31 October following the tax year: deadline for paper Self-Assessment returns.
• 31 January following the tax year: deadline for online Self-Assessment returns and payment of any balancing tax due.
• 31 July following the tax year: deadline for the second payment on account (if applicable).

Missing these deadlines triggers automatic penalties that start at £100 and escalate quickly.

The Personal Allowance

The Personal Allowance is the slice of income you can earn each year before any income tax is due. For 2025/26 it is £12,570, and it has been frozen at this level since 2021/22. The government has confirmed the freeze will continue to April 2028.

Every UK resident individual is entitled to one Personal Allowance per tax year, regardless of how many sources of income they have. You do not get one for each job. If your total taxable income is below £12,570, you generally owe no income tax at all.

Marriage Allowance

If you are married or in a civil partnership and one of you earns less than the Personal Allowance while the other is a basic-rate taxpayer, the lower-earning partner can transfer up to 10% of their unused allowance — that is £1,260 — to the higher earner. This can save the couple up to £252 a year in tax and can be backdated for up to four previous tax years where eligibility existed. The transfer is made using HMRC’s Marriage Allowance service online.

Tapering of the Personal Allowance

Once your “adjusted net income” exceeds £100,000, your Personal Allowance is reduced by £1 for every £2 of income above that threshold. So by the time adjusted net income reaches £125,140, the Personal Allowance has tapered away to zero. The practical effect is that the slice of income between £100,000 and £125,140 is effectively taxed at 60% — 40% income tax plus the withdrawn allowance — and is sometimes called the “60% tax trap”.

Blind Person’s Allowance

People who are registered blind (in England and Wales) or who cannot perform work that requires eyesight (in Scotland and Northern Ireland) are entitled to an extra Blind Person’s Allowance, £3,130 in 2025/26, on top of the Personal Allowance. Unused Blind Person’s Allowance can also be transferred to a spouse or civil partner.

Income Tax Bands and Rates

Income tax bands in England, Wales and Northern Ireland are the same and are set by the UK government. Scottish income tax bands are set by the Scottish Parliament and differ significantly. Both apply only to non-savings, non-dividend income (broadly, wages, self-employment profit, pensions, and rental income). Dividend income and savings income have their own rates layered on top.

England, Wales and Northern Ireland (2025/26)

Note that these are bands of taxable income, not gross salary. Pension contributions and Gift Aid donations can reduce your taxable income and pull you down out of a higher band.

Scottish Income Tax (2025/26)

Scottish residents pay Scottish income tax on their non-savings, non-dividend income. Scotland has had more bands and higher top rates than the rest of the UK for several years.

A Scottish taxpayer on £80,000 of salary pays more income tax than their equivalent in Manchester or Cardiff, because the higher-rate threshold kicks in at £43,662 rather than £50,270 and the top rates are higher. HMRC identifies Scottish taxpayers by where their main residence is.

Welsh Rates of Income Tax

Wales has the power to set its own rates but, to date, the Welsh rates have been aligned with England and Northern Ireland. The Welsh Rate of Income Tax (WRIT) technically lives on — each of the three UK rates (basic, higher, additional) is reduced by 10p in Welsh payslips and the Welsh government adds 10p back — but the net effect for Welsh taxpayers is the same as for English taxpayers.

Savings Income Rates

Bank interest and similar savings income have their own rate ladder. The key figures for 2025/26 are:

• Personal Savings Allowance: £1,000 for basic-rate taxpayers, £500 for higher-rate taxpayers, £0 for additional-rate taxpayers.
• Starting rate for savings: up to £5,000 taxed at 0% — but only if your non-savings income is below the Personal Allowance, with the £5,000 band reducing pound-for-pound as non-savings income rises above the Personal Allowance.

Above those allowances, savings income is taxed at the main rates (20% / 40% / 45%). Cash ISAs pay interest tax-free and don’t count towards any allowance.

Dividend Income Rates

Dividends from shares and equity funds are taxed separately:

• Dividend allowance: £500 (2025/26), down from £1,000 the previous year and £2,000 before that.
• Above the allowance, dividends are taxed at 75% (basic), 33.75% (higher) and 39.35% (additional).

Dividends still use up your basic and higher-rate bands, so earning £50,000 of salary and £10,000 of dividends pushes almost all of the dividends into the higher-rate bracket.

How UK Income Tax Is Calculated Step by Step

The order in which HMRC stacks different types of income matters. The official order is:

1. Non-savings, non-dividend income (salary, self-employment, pension, rent).
2. Savings income (interest).
3. Dividend income.

Allowances are applied in a way that maximises relief. The Personal Allowance is used against the income that would otherwise be taxed at the highest rate first, although in practice for PAYE purposes HMRC applies it against employment income.

Example: Working Out a Simple Tax Bill

Priya, based in Leeds, earns a salary of £45,000 in 2025/26. She has no other income.

1. Gross salary: £45,000.
2. Personal Allowance: £12,570 (taxed at 0%).
3. Remaining £32,430 falls entirely within the basic-rate band.
4. Tax due: £32,430 × 20% = £6,486.
5. Net pay: £45,000 − £6,486 − National Insurance − any pension contributions.

A More Complex Example

Tomasz, based in Birmingham, has the following 2025/26 income:

• Salary of £70,000.
• Bank interest of £1,200.
• Dividends of £3,000 from a share portfolio.

Step by step:

1. Salary of £70,000 minus Personal Allowance £12,570 = £57,430 taxable salary.
2. Basic rate band covers £12,571–£50,270, i.e. £37,700 at 20% = £7,540.
3. Higher rate band starts at £50,270. Tomasz has £19,730 of salary left (£70,000 − £50,270). That is taxed at 40% = £7,892.
4. Personal Savings Allowance: Tomasz is a higher-rate taxpayer, so his allowance is £500. First £500 of interest is tax-free; the remaining £700 is taxed at 40% = £280.
5. Dividend allowance: first £500 of dividends is tax-free. Tomasz has £2,500 of taxable dividends left, all sitting in his higher-rate band, taxed at 33.75% = £843.75.
6. Total income tax = £7,540 + £7,892 + £280 + £843.75 = £16,555.75.

Always work out salary tax first, then savings, then dividends. Swap the order and the numbers change.

PAYE: How Tax Is Collected from Employees

Pay As You Earn (PAYE) is the system employers use to deduct income tax and National Insurance from wages and pay them directly to HMRC on your behalf. For most employees, PAYE is designed to collect the right amount of tax over the year so that no Self-Assessment return is needed.

The employer uses your tax code to calculate how much tax to take each pay period. The tax code is issued by HMRC, not the employer, although the employer applies it. A typical code is 1257L, which indicates the standard Personal Allowance of £12,570. The letter at the end tells the employer about your circumstances — for example, K codes mean your allowances have been reduced by benefits in kind or underpaid tax owed from previous years, and emergency codes (M1, W1, X) mean tax is being worked out on a non-cumulative basis.

Common Tax Code Letters

• L – standard Personal Allowance.
• M – you have received 10% of your partner’s allowance via Marriage Allowance.
• N – you have transferred 10% of your allowance to your partner.
• T – HMRC is reviewing your circumstances; often used when income exceeds £100,000.
• K – your deductions exceed your allowances (e.g. company car benefit, state pension).
• BR – all income taxed at basic rate; common for a second job.
• D0 – all income taxed at higher rate.
• D1 – all income taxed at additional rate.
• NT – no tax is being deducted.
• S or C prefix – Scottish or Welsh taxpayer.

If your tax code looks wrong, log in to your Personal Tax Account on GOV.UK and check the underlying figures. Employers are not in a position to correct HMRC estimates of benefits in kind or company car values, so a wrong code often means a wrong estimate in HMRC’s system.

Emergency Tax

When you start a new job and your new employer does not yet have a P45 from your previous employer, they may put you on an emergency code (often 1257L W1/M1 or 0T). This collects tax as though the pay period is a one-off, without reference to your year-to-date earnings. It can cause over- or under-deduction, which usually corrects itself automatically once HMRC sees your PAYE data and issues a normal cumulative code. If it does not, you can ask HMRC to update your code.

Self-Assessment: When PAYE Is Not Enough

You must file a Self-Assessment tax return if any of the following apply in a tax year:

• You are self-employed with turnover above £1,000.
• You are a partner in a partnership.
• You have untaxed income (e.g. rental, foreign, dividends above the allowance where tax is not collected via PAYE).
• Your total income is more than £150,000 — note that before 2023/24 the trigger was £100,000, but HMRC has raised it.
• You are liable to the High Income Child Benefit Charge (from 2024/25, the triggering threshold is £60,000 of adjusted net income, not £50,000).
• You need to pay Capital Gains Tax.
• You receive Gift Aid donations and want to claim higher-rate relief, or made pension contributions that need higher/additional-rate relief.

Returns for 2025/26 must be filed online by 31 January 2027 with any tax due paid by the same date. Paper returns have an earlier deadline of 31 October 2026.

High Earner Traps

The £100,000 Cliff Edge

As mentioned above, the Personal Allowance tapers away between £100,000 and £125,140 of adjusted net income, creating a 60% marginal tax band. It is frequently worth making pension contributions or charitable donations that pull adjusted net income back below £100,000 to avoid the trap.

Loss of Tax-Free Childcare and Free Childcare Hours

Adjusted net income above £100,000 also removes eligibility for Tax-Free Childcare (worth up to £2,000 per child per year, or £4,000 for a disabled child) and for the 15/30 hours of free childcare in England. This is often a more expensive loss than the tax itself.

The High Income Child Benefit Charge

If you or your partner receive Child Benefit and one of you has adjusted net income above £60,000, a charge claws back some or all of the benefit. It is fully clawed back once adjusted net income hits £80,000. The charge is collected through Self-Assessment. Pension contributions can reduce adjusted net income and reinstate the benefit.

Frozen Thresholds and Fiscal Drag

Because the Personal Allowance and higher-rate threshold have been frozen while wages grow with inflation, more and more taxpayers are being dragged into higher bands — a phenomenon nicknamed “fiscal drag.” The OBR has estimated that the frozen thresholds will create around four million new higher-rate taxpayers between 2021 and 2028.

Types of Income and How They Are Taxed

Employment Income

Includes salary, bonuses, tips, benefits in kind (company cars, private medical, interest-free loans above £10,000) and most termination payments above the £30,000 threshold. Tax is collected via PAYE. Benefits in kind are reported on a P11D and taxed by adjusting your tax code.

Self-Employment Income

Sole traders and most partners pay income tax on their profits after allowable expenses and capital allowances. Profits are reported on Self-Assessment and tax is paid in two instalments (payments on account) in January and July, plus a final balancing payment. The Trading Allowance lets you earn £1,000 a year from trading before tax or a return is due.

Pension Income

Both State Pension and private pension income are taxable. The State Pension is paid gross — no tax is taken at source — and any tax owed is collected via PAYE on a private pension if you have one, or via Self-Assessment. The Triple Lock has kept the State Pension rising annually, and in the 2025/26 tax year the new full State Pension sits at around £11,970 — already close to the Personal Allowance. By 2026/27 it is widely expected to exceed it, meaning State Pension alone could push some retirees into paying tax.

Rental Income

UK rental profits (rent minus allowable expenses) are taxable. Landlords get a £1,000 property allowance against gross rent if they prefer that to claiming expenses. Mortgage interest on residential buy-to-let is no longer deductible as an expense; instead, landlords get a 20% tax credit.

Savings Income

Interest from banks, building societies, corporate bonds, gilts, peer-to-peer platforms, and certain NS&I products. Some NS&I products (Premium Bonds, some ISAs) pay tax-free. Gilts interest is taxable but gilts capital gains are not.

Dividend Income

From limited company shares, equity funds, investment trusts, and some REITs. The dividend allowance and separate rates apply.

Foreign Income

UK residents are generally taxed on worldwide income. Double taxation treaties and the Foreign Tax Credit Relief mechanism prevent tax being paid twice. From 6 April 2025, the new four-year residence regime replaces the old remittance basis.

Allowances and Reliefs That Reduce Your Bill

• Pension contributions – get tax relief at your marginal rate, up to the Annual Allowance (£60,000 for most, tapered for high earners down to £10,000).
• Gift Aid donations – basic-rate relief is claimed by the charity; higher and additional-rate donors claim the extra through Self-Assessment.
• Employee expenses – wholly, exclusively and necessarily incurred in the performance of your duties (a strict test).
• Working-from-home allowance – £6 a week, subject to conditions, for employees required to work from home.
• Trading Allowance – £1,000 for casual self-employed or side-hustle income.
• Property Allowance – £1,000 for rental income.
• Savings allowances – PSA, starting rate, ISA wrappers.
• Marriage Allowance – £252 a year.
• Blind Person’s Allowance – £3,130 on top of Personal Allowance.
• EIS, SEIS, VCT income tax relief – 30% up-front relief for qualifying investments (50% for SEIS), subject to holding period and scheme rules.

Case Studies

Case Study 1: The PAYE Employee Who Never Looked at Their Tax Code

Sarah, a marketing manager in Manchester, has earned around £40,000 a year for five years. Her tax code has always been 1257L, which is correct for a straightforward salary. She never looked at it. In 2024, she received a company car — a hybrid SUV with a P11D value of £32,000 and a 15% benefit rate, giving a £4,800 taxable benefit. HMRC did not update her tax code immediately because her employer submitted the P11D late. When they did, they issued a new code of 777L mid-way through the year, which meant her December payslip took an additional £1,000 in tax to catch up. The lesson: always check your tax code when you start receiving a benefit in kind.

Case Study 2: The Accidental 60% Trap

James, a consultant in London, was offered a bonus that took his salary from £98,000 to £108,000. Looking at the marginal rate of 40%, he expected to keep £6,000 of the £10,000 bonus. What he actually kept was closer to £4,000, because the extra £8,000 above £100,000 tapered £4,000 off his Personal Allowance, effectively taxing part of the bonus at 60%. He could have paid £8,000 into his pension to bring adjusted net income back below £100,000, reclaiming both the tax and entitlement to Tax-Free Childcare.

Case Study 3: The Scottish Higher Earner

Iona earns £80,000 as an architect in Edinburgh. Her counterpart David earns £80,000 in Newcastle. Iona pays Scottish income tax; David pays UK income tax. Iona’s tax bill is around £19,800, while David’s is around £17,432 — a difference of over £2,300 a year simply because she lives north of the border. Understanding where the HMRC views your main residence matters if you split your time across the UK.

Common Mistakes and Risks

1. Assuming PAYE is always right. PAYE is generally accurate but is only as good as the inputs HMRC has. Benefits-in-kind estimates, state pension payments, and second jobs frequently produce wrong codes.
2. Ignoring the dividend allowance cut. Many small investors still believe the allowance is £1,000 or £2,000. It is now £500.
3. Paying tax on savings unnecessarily. If you have headroom in your Personal Allowance, the starting rate for savings and the Personal Savings Allowance can stack and give you up to £18,570 of tax-free interest — but you need to earn little other income.
4. Missing pension relief. Higher and additional-rate taxpayers must claim the extra relief via Self-Assessment if they pay into a relief-at-source pension. Many don’t.
5. Double-counting the Trading/Property Allowance. You cannot claim both the £1,000 allowance and expenses for the same activity — pick one.
6. Getting the order of income wrong. Stack salary, then savings, then dividends. Putting dividends first can make the sums look better than they are.
7. Ignoring the High Income Child Benefit Charge. Even if you don’t receive the benefit, if your partner does and you have the higher income, you are responsible for the charge.
8. Overlooking the residence test. Anyone who works abroad for part of the year, or who comes to the UK mid-year, needs to check the Statutory Residence Test carefully.

The 2026 Outlook and Future Changes

Income tax thresholds are, on current policy, frozen through the 2027/28 tax year. That means the Personal Allowance stays at £12,570 and the higher-rate threshold at £50,270. With wage inflation running in the low-to-mid single digits, this drags more income into tax and more earnings into higher bands — a silent tax rise the Treasury has relied upon for several years. At some point a government will have to either unfreeze the thresholds or accept the political consequences of fiscal drag.

The 2026/27 tax year also sees continuing roll-out of Making Tax Digital for Income Tax Self Assessment (MTD for ITSA). From April 2026, self-employed individuals and landlords with gross income above £50,000 are due to move to quarterly digital reporting, with those above £30,000 following in April 2027. This is not a new tax, but it radically changes how records are kept and submissions made.

Other changes that taxpayers should have on their radar:

• The new four-year residence regime for new arrivals (from 6 April 2025) replaces the remittance basis for non-doms.
• Adjusted net income thresholds for the High Income Child Benefit Charge were raised to £60,000/£80,000 from 2024/25.
• The Personal Savings Allowance and dividend allowance have been under pressure and could be cut further.
• State Pension is close to the Personal Allowance, which, if thresholds remain frozen, will see rising numbers of pensioners pulled into tax — possibly triggering a political response.
• The Scottish and Welsh governments may diverge further from the rest of the UK.

Conclusion

UK income tax is not as complicated as it first looks once you understand that income is stacked in a specific order and taxed at specific bands, with allowances carving out tax-free slices in each category. Most people can work out their liability in five minutes with a calculator, once they know their salary, savings, dividends, pension and rental position. What makes income tax hard in practice is the tangle of small rules around it: the 60% trap, fiscal drag, tapered allowances, Scottish bands, the Child Benefit charge, and the constant drip of small Budget announcements that change the numbers. Spending an hour a year checking your tax code, reviewing your pension contributions and confirming your adjusted net income is one of the highest-return uses of time in personal finance.

A Brief History of UK Income Tax

Understanding where income tax came from often helps taxpayers grasp the logic of how it is structured today. Income tax was first introduced by William Pitt the Younger in 1799 as a temporary measure to fund the Napoleonic wars. Pitt’s tax applied a graduated rate on annual incomes above £60, and was repealed in 1802, reintroduced, repealed again in 1816, and finally reintroduced by Sir Robert Peel in 1842 — also as a temporary measure. Nearly two centuries later, it remains on the statute book and is re-enacted each year in the annual Finance Act.

The core structure — an allowance plus progressive bands — has been around since the early twentieth century. What has changed is the detail: the number of bands, their width, the top rate (which hit 98% at its peak in the 1970s), and the treatment of specific income types such as dividends and savings. The current three-band structure for England, Wales and Northern Ireland has been broadly stable since 2010, although thresholds have moved, and Scotland has evolved a six-band structure of its own since devolved tax powers were granted to the Scottish Parliament in 2017.

The Income Tax Computation in Practice

If you ever have to prepare a manual income tax computation — perhaps for a Self-Assessment return or to check HMRC’s figures — the standard format follows HMRC’s internal order: total each category of income, subtract allowable deductions, apply allowances, apply band rates, then subtract tax credits and reliefs at the end. The order matters because some reliefs only reduce tax owed at the marginal rate and others reduce the bill pound-for-pound.

A worked skeleton looks like this: employment income, plus self-employment profits, plus rental profits, plus pension income, plus taxable state benefits = non-savings income. Add savings income and dividend income to get total taxable income. Deduct the Personal Allowance (allocated against the income that would otherwise be taxed at the highest rate). Apply rates by slice of income in the order non-savings, savings, dividends. Deduct any reliefs given at source (such as Marriage Allowance received) and finishing tax reducers (EIS/SEIS/VCT relief), and you arrive at the final figure. Most online calculators do this automatically, but understanding the underlying mechanics makes you a much better judge of your own numbers.