PAYE Explained – How Pay As You Earn Works in the UK

If you’ve ever looked at your payslip and wondered why the number you actually receive is smaller than the salary you agreed to, the answer is almost always PAYE.  PAYE Explained Short for Pay As You Earn, this is the system HM Revenue & Customs (HMRC) uses to collect Income Tax and National Insurance directly from your wages, before the money even reaches your bank account.

This guide breaks down exactly how PAYE works, who it applies to, how your tax code affects your pay, and what to do if something looks wrong on your payslip. Whether you’re starting your first job, switching employers, or just want to understand your deductions properly, this article covers everything you need — in plain English.

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What Is PAYE?

PAYE stands for Pay As You Earn.PAYE Explained It’s the method employers use to deduct Income Tax and National Insurance contributions (NICs) from employees’ wages or pensions, then pass that money to HMRC on their behalf.

It’s the method employers use to deduct Income Tax and National Insurance contributions (NICs) from employees’ wages or pensions, then pass that money to HMRC on their behalf.

PAYE Explained It’s the method employers use to deduct Income Tax and National Insurance contributions (NICs) from employees’ wages or pensions, then pass that money to HMRC on their behalf.

Instead of paying a lump sum of tax once a year (like self-employed people do through Self Assessment), PAYE spreads your tax bill across every payday. PAYE Explained PAYE Explained Your employer does the calculation, deducts the right amount, and pays you the remainder — your net pay.

In short:

• Gross pay = what you earn before deductions
• PAYE deductions = Income Tax + National Insurance (and sometimes student loan repayments, pension contributions)
• Net pay = what actually lands in your bank account

Who Needs to Pay Tax Through PAYE?

PAYE applies to almost anyone who works for an employer in the UK, including:

• Full-time and part-time employees
• Temporary and casual workers
• Company directors
• Agency workers
• People receiving a workplace or private pension

If you’re self-employed, PAYE doesn’t apply to you — you’ll handle tax through Self Assessment instead. However, many people are both employed and self-employed at the same time, in which case PAYE covers the employment income while Self Assessment covers the rest.

How Does PAYE Actually Work? (Step-by-Step)

Here’s what happens behind the scenes every time you get paid:

Your employer registers with HMRC
Before hiring anyone, a business must register as an employer with HMRC and set up a PAYE scheme.

You’re assigned a tax code
HMRC issues a tax code based on your personal allowance, benefits, and any other income.PAYE Explained Your employer uses this code to work out how much tax to deduct.

Your employer calculates deductions
Each payday, your employer works out your gross pay, then deducts:

• Income Tax (based on your tax code and tax band)
• National Insurance contributions
• Any student loan repayments due
• Pension contributions (if you’re enrolled)

You receive your net pay
The remaining amount is paid into your bank account, and you get a payslip showing the breakdown.

Your employer reports and pays HMRC
Employers must report pay and deductions to HMRC on or before each payday using Real Time Information (RTI). PAYE Explained They then pay the deducted tax and NI to HMRC, usually monthly.

Understanding Your Tax Code

Your tax code is the key to how PAYE calculates your deductions, yet it’s one of the most misunderstood parts of a payslip.

A typical tax code looks like this: 1257L

• The numbers (1257) represent your tax-free Personal Allowance, multiplied by 10. So 1257 means £12,570 — the standard tax-free allowance for most people.
• The letter (L) tells your employer how to apply that allowancePAYE Explained. L means you’re entitled to the standard tax-free Personal Allowance.

Common Tax Code Letters

Letter	Meaning
L	Standard tax-free Personal Allowance
M	Marriage Allowance – received a transfer from your partner
N	Marriage Allowance – transferred part of your allowance to your partner
T	Tax code includes other calculations to work out your allowance
BR	All income taxed at the Basic Rate (often used for second jobs)
D0	All income taxed at the Higher Rate
K	You have income that isn’t being taxed elsewhere, so extra tax is deducted
0T	No Personal Allowance applied (often temporary, e.g. missing details)

If your tax code is wrong, you could end up overpaying or underpaying tax — so it’s worth checking it against your latest PAYE coding notice from HMRC.

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Income Tax Bands Under PAYE (2025/26)

PAYE ExplainedYour tax code determines your allowance, but the amount of tax you actually pay depends on which Income Tax band your earnings fall into.

Band	Taxable Income	Tax 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%

Note: these bands apply in England, Wales, and Northern Ireland. PAYE Explained Scotland has its own Income Tax bands and rates, which differ slightly.

A Quick Example

Let’s say you earn £30,000 a year with the standard tax code 1257L.

• First £12,570 is tax-free
• Remaining £17,430 is taxed at 20%
• Tax owed: £3,486 per year, or roughly £290.50 a month

Your employer automatically works this out and deducts it through PAYE, spreading the amount evenly across your pay periods.

National Insurance Under PAYE

Alongside Income Tax, PAYE also collects National Insurance contributions. These go towards your entitlement to certain state benefits and the State Pension.

For most employees (Class 1 NICs), contributions are calculated based on how much you earn above a set threshold each pay period. The more you earn above that threshold, the more NI you pay, up to a certain point — after which the rate drops slightly for very high earners.

Your employer also pays Employer’s National Insurance on top of your wages, but this doesn’t come out of your pay — it’s a separate cost to the business.

What’s on a PAYE Payslip?

Every payslip should clearly show:

• Your gross pay
• Your tax code
• Income Tax deducted
• National Insurance deducted
• Any pension contributions
• Student loan repayments (if applicable)
• Your net (take-home) pay
• Year-to-date totals

If any of these figures look off, don’t ignore it — a small tax code error can mean overpaying tax for months without realising.

Common PAYE Problems and How to Fix Them

Emergency Tax Code

If you start a new job without giving your employer a P45, you might be placed on an emergency tax code temporarily. This can result in higher deductions until HMRC updates your code.

Fix: Give your new employer your P45 as soon as possible, or complete a starter checklist if you don’t have one.

Wrong Tax Code

Sometimes HMRC has outdated information — for example, if you’ve changed jobs, started a second income, or stopped receiving a benefit.

Fix: Check your tax code on your payslip or through your Personal Tax Account on GOV.UK, and contact HMRC if it looks incorrect.

Underpaid or Overpaid Tax

If your tax code was wrong for part of the year, you might owe HMRC money or be due a refund.

Fix: HMRC usually adjusts this automatically through your tax code in the following year, but you can also claim a refund directly if you’ve overpaid.

PAYE vs Self Assessment: What’s the Difference?

Feature	PAYE	Self Assessment
Who it’s for	Employees, pensioners	Self-employed, high earners, landlords
Who calculates tax	Employer	You (or your accountant)
When tax is paid	Every payday	Annually, by 31 January
Reporting	Automatic (RTI)	Tax return required
Risk of errors	Lower, but tax code issues possible	Higher, since it’s self-reported

Some people fall into both systems — for example, someone employed full-time who also earns rental income will pay PAYE on their salary and declare the rental income separately through Self Assessment.

Why Understanding PAYE Matters

Even though your employer handles the calculations, understanding PAYE helps you:

• Spot tax code errors early
• Avoid overpaying tax without realising
• Understand your payslip properly
• Plan your finances with a clear idea of your actual take-home pay
• Know what to check when starting a new job or getting a pay rise

PAYE is designed to make tax collection simple and automatic — but “automatic” doesn’t always mean “accurate.” Keeping an eye on your tax code and payslip is the best way to make sure you’re paying the right amount.

Final Thoughts

PAYE Explained PAYE might seem like a background process you never have to think about, but understanding how it works puts you in a much stronger position.PAYE Explained From knowing what your tax code means to spotting when something’s gone wrong on your payslip, a little knowledge goes a long way in making sure you’re not overpaying — or getting caught out by an unexpected tax bill. PAYE Explained

At the end of the day, PAYE is simply the UK’s way of making tax collection smooth and automatic. PAYE Explained But your payslip is still worth a second look every now and then — because even automatic systems can get things wrong.

FAQ’s