What Is the Personal Allowance?

Almost everyone in the UK can earn a certain amount each year completely free of Income Tax. That tax-free slice is the Personal Allowance, and it sits at the heart of how the system decides what you actually owe. Understanding it explains why your first few thousand pounds of pay are not taxed, why your tax code looks the way it does, and why some high earners face a surprisingly steep effective tax rate. This guide covers what the allowance is, how it is applied, when it can shrink or vanish, and how couples can share it. This is general information, not financial advice.

What the Personal Allowance is

The Personal Allowance is the amount of income you can receive in a tax year before Income Tax becomes payable. Income above the allowance is taxed in bands at increasing rates; income below it is not taxed at all. The UK tax year runs from 6 April to 5 April, and the allowance applies across that period.

For most employees and pensioners, the allowance is handled automatically. It is built into your tax code and spread evenly across your pay periods under PAYE, so you receive a portion of it tax-free each payday rather than all at once. That is why the common tax code is 1257L — the digits reflect the standard allowance, and the L confirms you get the standard tax-free amount.

The Personal Allowance is not a rebate you claim at year end. It is woven into your tax code and applied as you earn, which is why getting the code right matters so much.

How the allowance is applied

Because the allowance is spread across the year, each pay period gives you roughly one twelfth (for monthly pay) of your tax-free amount before Income Tax is calculated on the rest. This is what keeps deductions smooth and avoids a large bill later.

Several things can change how much allowance shows up in your code:

• Taxable benefits in kind, such as a company car or medical insurance, can reduce your tax-free amount, often reported on a P11D.
• Owing tax from an earlier year can be recovered by lowering this year's allowance.
• Untaxed income that HMRC collects through your code can also reduce it.

If your code gives you too little allowance, you pay too much tax and may be due a refund. If it gives you too much, you can underpay and owe tax later. Either way, the allowance is only as accurate as the code carrying it.

When the allowance is reduced or lost

A crucial point that catches people out: the Personal Allowance is not the same for everyone. For higher earners it is tapered away.

Once your income passes a set threshold, the allowance is reduced by one pound for every two pounds of income above that level. Keep earning and the allowance can disappear entirely at a higher income point. The practical effect is a band of income where your effective tax rate is unusually high, because you are both paying tax on the extra income and losing tax-free allowance at the same time.

The exact thresholds are set by the government and can change, so the authoritative figures are always on GOV.UK. The key takeaway is structural rather than numerical: very high earners cannot assume they receive the full allowance, and those near the threshold sometimes use pension contributions or other steps to manage their position. For decisions like that, weighing up pensions more broadly is part of the picture, and professional advice may be worthwhile.

Sharing the allowance: Marriage Allowance

Not everyone uses their full Personal Allowance — for example, if one partner earns little or nothing. Marriage Allowance lets a lower-earning spouse or civil partner transfer a fixed portion of their unused allowance to a partner who pays tax at the basic rate. The result can be a modest but worthwhile reduction in the couple's overall tax bill.

A few points to note:

• Both partners must meet the eligibility rules, including being married or in a civil partnership.
• The recipient must generally be a basic-rate taxpayer.
• You apply through GOV.UK, and the transfer is reflected in both partners' tax codes — typically shown by the letters M (received) and N (given).

It is not the right move for every couple, and circumstances change, so it is worth reviewing. But for many it is free money left on the table simply because they did not know the option existed.

Beyond Income Tax: related allowances

The Personal Allowance is specifically for Income Tax, but the UK system has other tax-free allowances that are easy to confuse with it. For example, savings interest and dividends have their own separate allowances, which is why dividend tax has its own rules rather than simply using your Personal Allowance. These allowances stack with, rather than replace, the Personal Allowance, and each has its own thresholds.

Keeping the distinction clear helps you plan. Your Personal Allowance covers earnings and pensions; other allowances cover particular kinds of income. Staying on top of how they interact is part of sensible money management and budgeting.

The bottom line

The Personal Allowance is the amount you can earn each tax year before Income Tax applies, and for most people it is delivered automatically through their tax code under PAYE. It is not fixed for everyone: high earners see it tapered away and can lose it entirely, while couples may be able to share an unused portion through Marriage Allowance. Because the allowance lives inside your tax code, it pays to check that code on your payslip and Personal Tax Account, and to confirm current figures on GOV.UK rather than relying on last year's numbers. For free, impartial help, MoneyHelper explains tax and allowances in plain English.