How to calculate payroll tax: PAYE for employees and the self-employed

Pay As You Earn (PAYE) is an HMRC process for collecting Income Tax through payroll — it means that tax is paid gradually to HMRC and is collected though employed people’s payroll. Self employed individuals typically pay Income Tax through self-assessment, a separate system unrelated to payroll 

Read our article for a clearer idea of any confusing tax terminology and get to grips with the UK tax system, whether you’re an employee or a self-employed individual. By understanding your PAYE deductions, you can teach yourself to budget effectively, identify payslip errors, and understand your tax obligations.

Learn more about how PAYE works as it appears on payslips, tax bands and rates, the relationship between PAYE and Self-Assessment, and how tax works differently for employees versus self-employed people.

PAYE tax rates: In summary

• PAYE is an automatic deduction system for Income Tax and varies based on your earnings and circumstances.

• PAYE automatically takes owed Income Tax and is handled by employers, whereas Self-Assessment is for self-employed individuals to handle themselves. 

• You can check your tax codes to help ensure you’re being accurately taxed and better understand how much you should be being taxed. 

Understanding PAYE as an employee

PAYE for employees is the system employers use to deduct Income Tax and National Insurance contributions from your salary, before it’s paid out. It’s managed by HMRC and is the primary way they collect NI and Income Tax owed.

How does PAYE affect my payslip?

PAYE is taken directly from your gross income — that’s your total wages before any other deductions. As an employee, you don’t need to do anything; your employer will deduct the correct amount on your behalf.

The amount of PAYE owed is based on your tax code and earnings, and each deduction appears on your payslip as a separate line. That way, there’s complete transparency on the amount you pay. Anything left after deductions is your “net pay” or take-home. 

With PAYE, you don’t need to calculate or remember to pay. The tax owed is deducted and paid for you. It also means you’re paying your taxes in manageable instalments, rather than in bulk at the end of the year. 

PAYE tax on your payslip

When you read your payslip, you may notice a line stating “PAYE” or “Income Tax (PAYE)”:

This is your Income Tax deduction for that specific pay period. The amount is based on your earnings and your tax code (e.g., 1257U, 0T, BR). It appears on a separate line from National Insurance contributions, while year-to-date (YTD) figures show accumulated tax deducted over the current tax year.

If you have variable hours, were rewarded a bonus, or had a pay change, you may notice different tax amounts compared to previous months. If you want to query your payslip, there are two steps you can take:

• Speak to your employer and check for incorrect tax codes or pay.

• Contact HMRC to check your current tax records.

How your tax code affects your PAYE

Your tax code has a direct impact on the amount of Income Tax you pay (and therefore how much PAYE is deducted from your payslip). 

A tax code is a designation issued by HMRC to show your tax-free allowance or taxable rate. They usually appear as numbers followed by a letter, and common tax codes include:

• 1257L — this code indicates you have the full standard tax-free personal allowance (£12, 570 as of 2026).

• BR (Basic Rate) — BR is used for secondary jobs or pensions and applies a flat 20% rate to all income (without a personal allowance).

• D0 (Higher Rate) — Any income from a job on D0 is taxed at the higher rate (40% as of 2026).

• D1 (Additional Rate) — Similar to D0 but at the top rate of 45%.

• 0T — This code means that the personal allowance has been fully used.

• NT — Stands for ‘No Tax’ and means tax is not deducted from this income stream.

• M/N — Relates to the marriage allowance.

Tax codes can change throughout the year when HMRC receives updates regarding your income or personal circumstances. Think pay rises, new jobs, receiving taxable benefits, or marriage.

If your benefits change, you should let your employer know so they can update your records as required. 

There are several ways you can receive your tax code, such as from:

• P45 (Issued by an employer when you stop working for them)

• P60 (Issued by your employer by the 31^st May)

• HMRC Letters/Correspondence

If you receive an emergency tax code or believe your tax code is incorrect, you can contact HMRC. 

PAYE tax rates and bands explained

PAYE tax rates (or tax bands) define the amount of tax you’ll pay on your earnings. The Income Tax Personal Allowance in the UK as of 2026 is £12,570, after which you’ll pay income tax.

These tax bands apply differently depending on your region, and tax rates change each year. You don’t need to calculate your tax rate yourself, but understanding it can help you when looking at your payslips (or understanding your current tax position). 

Tax bands help those with lower earnings, granting them a tax-free allowance and gradually increasing tax at higher earnings.

Tax rates can vary between countries in the UK, mainly due to devolution. This means that the Scottish and Welsh Parliaments can set their own income tax rates and bands for their residents, independent of the UK government. Wales generally aligns with England, but Scotland has a more progressive system that leans toward higher taxes for higher earners.

Standard UK Income Tax Bands for Employees

The standard Income Tax bands include Basic Rate, Higher Rate, and Additional Rate as shown above. These bands and rates apply if you have a standard personal allowance:

Note that taxable income over £125,140 is not entitled to a Personal Allowance, and Income Tax bands may vary for residents who live in Scotland. Tax bands change annually, so always check current rates with HMRC.

Many employees will fall into the Basic Rate band, but if you don’t use your Personal Allowance to its capacity, you can:

• Transfer up to £1,260 of your allowance to a spouse who earns more.

• Put unused Personal Allowance toward savings interest or dividend income.

• Ask HMRC to split the Personal Allowance between employers so as not to overpay on tax.

If you earn very high amounts, you may lose your Personal Allowance to ensure you pay a higher proportion of tax. This slowly reduces for every £2 above £100,000 in net earnings. 

How your PAYE deduction is calculated from tax rate bands

PAYE calculations are simple and transparent, making them easy to follow if you understand the process:

• Your employer applies your tax code to determine your tax-free allowance — they’ll receive this through a P45 or P60 in most circumstances.

• Income above the allowance is taxed at the appropriate rate according to the PAYE tax bands based on your earnings.

• The resulting Income Tax is then deducted as PAYE from each payslip, based on your earnings.

• Throughout the year, your cumulative PAYE should be on track to match your total tax liability.

Payroll software like QuickBooks handles these calculations automatically, so that employees don’t need to spend time calculating it all themselves.

Employee National Insurance and PAYE income tax for employees

Employee National Insurance (NI) and PAYE income tax appear as two separate deductions on payslips. Each of these deductions funds different things:

• Income Tax (based on tax bands) funds any general government investment or public services spending, including the NHS, education, infrastructure or welfare.

• National Insurance Contributions (based on earnings thresholds) primarily go to social security benefits like Maternity Allowance or Jobseeker’s Allowance, as well as the state pension. 

National Insurance contributions are a core part of payroll taxes and are based on an employee’s earnings (and their employment status). NI is like general taxation, but contributions should typically be lower than PAYE deductions in most cases. 

When your PAYE deduction might vary

PAYE deductions can vary from payslip to payslip, and the most common reasons for this are:

• Variable earnings. Hourly workers and commission-based workers are most likely to notice PAYE deductions/Income Tax variations as their earnings can vary each payday. 

• Changes in tax code. If your tax code changes due to a promotion (or if your tax code is being corrected), this can lead to a significant change in your PAYE tax deductions.

• Bonuses. If you receive a bonus or additional payments, then you’ll pay more Income Tax for that pay period based on the amount earned.

• Emergency tax. When you start employment, you may be put on emergency tax. This is a temporary tax code put in place when there are not enough tax details to determine your correct band. You can get a reimbursement for any overpaid tax.

• Common emergency tax codes include 1257L W1 for weekly pay, 1257L M1 for monthly pay, BR, 0T or X.

• Pay frequency changes. If your pay frequency alters — from monthly to weekly, for example — your tax will change in proportion to the change in pay date.

• Tax year transitions. The tax year runs from April 6^th to April 5^th the following year. When entering a new tax year, your payslip will reflect any changes in tax codes, new payroll legislation, and your cumulative total will reset.

Most of these changes to your PAYE deductions are standard, but you should pay attention to and resolve any issues with emergency tax to get the correct tax code and reimburse any money you’re owed.

Spotting PAYE Errors on Your Payslip

To ensure you’re paying the correct amount of tax in your PAYE deductions, it’s important to be able to spot any abnormalities or errors on your payslip. Here are some things to look out for:

• PAYE amounts increasing or decreasing without explanation.

• PAYE tax codes on your payslip do not match with HMRC correspondence.

• The gross pay amount doesn’t seem correct based on your salary/wage.

• Deductions not aligning with expectations (tax, student finance, NI, pension, etc).

• YTD figures do not add up based on tax rates.

Don’t hesitate to query your payslip if you don’t understand it. If you want to challenge any potential errors, contact your employer or HR department first, then escalate your query to HMRC if it’s unresolved. 

Starter checklist for PAYE employees 

It’s important to check your payslip when you first get paid. To ensure everything seems okay, just follow these steps:

• Wait for your first payslip

• Check your name, employee number, and tax code

• Verify gross pay matches your offer letter

• Check PAYE deduction (Income Tax)

• Check National Insurance deduction

• Note any other deductions (pension, student loan, etc.)

• Calculate and verify your net (take-home) pay

• Save payslips for your records

• Flag any errors or discrepancies with payroll immediately

• Access your HMRC Personal Tax Account to confirm tax code

If anything seems wrong, contact your employer or HR department and they should help you resolve any issues.

Understanding the relationship between Self-Assessment and PAYE

PAYE works differently for self-employed people who instead do their own Self-Assessment — you still owe tax, but it’s not processed in the same way as an employee.

While employers use HMRC’s PAYE system, self-employed individuals use Self-Assessment to report their earnings instead. Think of PAYE as a system for collecting Income Tax — Self-Assessment is just another way to achieve the same but for self-employed individuals.

Let’s look at that in a bit more detail:

• Employees under PAYE: Income Tax and National Insurance are deducted by employers on each payday. An employee does not have to declare their income or earnings, as it’s generally done for them through PAYE. That means there’s generally  no year-end Self-Assessment required unless you have other non-employment income.

• Self-Employed under Self-Assessment: You are responsible for managing your own tax and reporting your annual earnings to HMRC. You can pay your tax either in instalments or as a single lump sum. It is not automatic.

PAYE and Self-Assessment are not competing systems, but rather different approaches based on your employment status. If you:

• receive a payslip that contains NI and Income Tax deductions

• have a tax code listed on your payslip

• work for an employer who manages your tax,

Then it is likely that you are using the PAYE system for that income stream.

On the other hand, if you are any of the below then you’ll likely need to report your income through Self-Assessment:

• self-employed or sole trader

• a partner in a business partnership

• have untaxed income (such as from properties)

• are a contractor

• a director of a limited company,

As of 2026, the UK has introduced Making Tax Digital for Income Tax. Under this system you will need to provide quarterly updates from HMRC-recognised MTD-compliant software every quarter, with a final declaration at the end of the year. Learn more about MTD for IT.

In some cases, if you’re both self-employed and an employee, PAYE and Self-Assessment tax could apply to you. For example, you may be a landlord who works a day job for an employer. In this scenario, you would be subject to PAYE through your employer, while also providing a breakdown of your income from your properties through Self-Assessment. Note that your income from employment will also be included on your Self-Assessment tax return, with a credit for any tax already paid to HMRC via payroll..

PAYE for employees vs. self-assessment for self-employed

PAYE for employees has some differences from Self-Assessment for people who are self-employed. Here’s a quick and easy glance at some of the key differences to help you:

Based on this table, you can see that PAYE is convenient for employees and shoulders a lot of the responsibility. While Self-Assessments are more work for the individual, it can provide more flexibility and oversight.  

If you start self-employment while you are employed, then you’ll need to provide a Self-Assessment. If you stop sole trading and find employment, you’ll need to notify HMRC as you will not be automatically removed, and you’ll have to submit a tax return for that year. 

Tax planning and PAYE considerations for self-employed

As a self-employed individual, your taxes are solely your responsibility — which can sometimes be overwhelming.  If done wrong, you may face penalties, so it’s important to get ahead of your reporting. If you’re coming from an employed background (as most will), then Self-Assessment may be particularly new to you.

Consider the following to ensure your self-reporting is as smooth as possible:

• Estimate your annual earnings to forecast tax liability

• Set aside money for monthly tax payments rather than paying in a lump sum

• Consider three instalments (payments on account) for Self-Assessment, which go toward your next tax bill. These are on 31 January, 31 July and 31 January the following calendar year.

• Keep detailed digital records of income and expenses to help you stay compliant and refer to.

• Plan for Self-Assessment deadlines by noting them in your calendar.

• If moving from employment, consider any potential tax issues that could arise. 

Transitioning between PAYE and self-employment

When someone moves either to or from self-employment, their tax responsibilities change too. Depending on your circumstances, you need to consider the following:

• Leaving employment. When you leave employment, you’ll receive a P45 showing your YTD earnings and tax paid. If you don’t get this, you should try chasing your old employer for it. 

• Starting self-employment. When you start self-employment, you should immediately register for Self-Assessment. Your tax position for the current year depends on your earnings so far (and the date of change).

Depending on your circumstances, you may owe additional tax or receive a refund. For example, you may have paid more tax while self-employed and taken a pay cut to start a new job role. 

When moving from employment to self-employment, it’s important to support yourself as you won’t have the backing of a company:

• Create a cash buffer to support yourself if something stops you from working.

• Open a dedicated business account so you don’t mix up your income, expenses, and so on. This can make it easier to assess your finances. 

• Consider “taxing” your income (setting aside a percentage of your earnings each month) rather than trying to pay bigger sums you hadn’t planned for.

• Log all your business expenses to reduce your taxable profit.

• Give yourself a monthly payment from your business, rather than taking money from the business as and when.

PAYE for employees and self-employed FAQs

Why is my PAYE deduction different each month?

There are many reasons why your PAYE tax deduction might vary on your payslip each month. These could be due to tax code changes, a pay bonus, variable hours worked, a promotion, or revised pay frequency. If none of these things have happened, then you may want to query it with your employer. If your tax code is wrong and you’ve been charged too much tax, you may get a refund (or a request for unpaid tax if the opposite is found to be true). 

How do I know if I'm overpaying PAYE?

You can work out if you’ve paid too much Income Tax through PAYE by calculating your gross income against the relevant tax bracket(s) and checking if your tax code is too low, looking for emergency tax codes, or checking to see if you’re constantly receiving refunds. If you want to request a refund for overpaid Income Tax through PAYE, you can contact HMRC. Tax refunds take roughly 5 to 14 working days to hit your bank account, but it can take longer depending on the method you choose. 

I'm starting self-employment alongside my job — how does PAYE work now?

Being self-employed alongside employment isn’t too complicated. Your employer will continue to deduct your Income Tax through PAYE for your salary or wage, while you handle your Self-Assessment tax. Your total income is combined at the end of the year to correctly assess your final tax owed. This means you may need to pay a small sum just to balance the books.

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