PAYE UK stands for “Pay As You Earn” and is the system UK employers use to deduct income tax and National Insurance contributions from employees’ pay before wages or salaries are paid, then calculate and report those deductions to HM Revenue & Customs (HMRC). For employers, operating PAYE correctly is a legal requirement that helps avoid errors, missed deadlines and penalties; for employees, it means tax is usually handled automatically instead of through an annual self-assessment return. This guide explains how PAYE works in practice, including tax codes and National Insurance, employer duties and reporting deadlines, penalties for mistakes, payroll software, employee rights, tax code changes, dispute resolution and special cases such as expat employees and company owners.
PAYE (Pay As You Earn) is the system used by HM Revenue & Customs (HMRC) to collect Income Tax from employment income and pensions, as well as National Insurance contributions from employees’ earnings. These deductions are usually taken automatically before you receive your pay.
How PAYE works
- Tax is deducted automatically: Your employer calculates and deducts the Income Tax and National Insurance you owe each time you are paid. Pension providers can also deduct Income Tax from pension payments through PAYE, although National Insurance is not normally deducted from pension income.
- Your tax code determines your allowance: HMRC provides your employer with a tax code, such as 1257L, which helps determine how much of your income can be earned tax-free and how much tax should be deducted.
- Your employer pays HMRC: The money deducted from your wages is sent directly to HMRC on your behalf.
- Most employees do not need a tax return: Because tax is collected through PAYE throughout the year, most employees do not need to complete a Self Assessment tax return unless they have other income or circumstances that require one.
In simple terms, PAYE means your tax is taken from your earnings before you are paid, helping spread your tax payments across the year.
Who Needs To Know About PAYE
Employers taking on staff will normally need to register with HMRC and operate PAYE for employees on their payroll. So if you are running a business and plan to employ staff, it is essential that you understand what PAYE is and how it works. Genuinely self-employed contractors and freelancers generally do not fall under the PAYE system in the same way as employees.
As an employer with staff paid under PAYE, you need to:
- Register with HMRC as an employer where required
- Deduct tax and National Insurance from employees’ pay
- Report details of employees’ pay and deductions to HMRC
- Calculate and make PAYE payments to HMRC on time
Additionally, anyone taking on an employed role where they will be paid directly by an employer needs to be familiar with how PAYE impacts their take-home pay.
PAYE is something UK employers and employees need to understand, as it forms the backbone of how tax and National Insurance contributions are managed when tax is taken from an employee’s salary before it reaches their take-home pay, and getting it right is important for staying legally compliant.
How PAYE Works
When an employer takes on a new member of staff, they will normally need to register with HMRC as an employer and obtain a PAYE reference number before the first payday. They then use payroll software, PAYE tax codes and the relevant HMRC rates and thresholds to calculate Income Tax, National Insurance and other payroll deductions from the employee’s gross pay, including pension contributions and student loan repayments where applicable.
These deductions are made before the net pay figure is calculated, so the money that reaches the employee’s bank account has already had tax and other amounts taken off.
Under Real Time Information (RTI), employers must report employees’ pay and deductions to HMRC using a Full Payment Submission (FPS), normally on or before each payday. The resulting PAYE bill is then usually paid to HMRC monthly, although eligible employers that usually owe less than £1,500 per month may be able to pay quarterly.
At the end of each tax year, employers send their final FPS or Employer Payment Summary (EPS) rather than a separate traditional annual PAYE return. Employees who are still working for the employer on 5 April must receive a P60 by 31 May, while P45s are issued when an employee leaves.
So in short, under PAYE:
- Employers use tax codes, payroll software and HMRC rates to calculate deductions from gross salary payments
- Pay and deductions are reported to HMRC through RTI, normally on or before each payday
- PAYE liabilities are paid to HMRC monthly or, where eligible, quarterly
- Final payroll reporting and P60s help confirm the employee’s pay and deductions for the tax year
This means much of the administrative burden of dealing with employment Income Tax falls on employers rather than individual PAYE employees.
PAYE Tax Codes
A key part of operating PAYE involves using the correct PAYE tax code. Employees are given tax codes which tell employers how their Income Tax should be calculated and how much tax-free allowance may be available.
The standard Personal Allowance for 2026/27 is £12,570. This means that, for someone entitled to the full allowance, a portion of their income can normally be earned before Income Tax becomes due. HMRC issues tax codes to reflect allowances like this. For example:
- 1257L – A common tax code for someone receiving the standard £12,570 Personal Allowance
- BR – This usually means all income from that particular job or pension is taxed at the basic rate, with no Personal Allowance applied to that income
Scottish taxpayers normally have an S prefix on their tax code, while Welsh taxpayers normally have a C prefix, because different Income Tax rates can apply.
This shows how tax codes help determine how much tax-free income someone can receive before they start paying tax.
As circumstances change, employees may be sent revised codes during a tax year, which employers must then apply to payroll calculations. So regular communication with HMRC and keeping employee information up to date is important.
National Insurance Contributions
As well as deducting Income Tax, employers must usually deduct employee National Insurance contributions from salaries before employees are paid. Income Tax rates depend on earnings and, in Scotland, different Income Tax bands and rates apply, while National Insurance has its own separate rates and thresholds.
National Insurance helps provide entitlement to certain state benefits and contributes towards government spending on services including the State Pension and NHS.
For most employees paying standard Class 1 National Insurance under category A in 2026/27:
- No employee National Insurance is normally payable on earnings up to the primary threshold of £12,570 a year
- 8% is paid on earnings between £12,570 and £50,270
- 2% is paid on earnings above £50,270
Different rates can apply to certain National Insurance categories.
Employers also pay employer National Insurance. For most employees, the standard employer rate in 2026/27 is 15% on earnings above the relevant secondary threshold.
So for higher earners, the portion of salary above the relevant thresholds can be subject to higher-rate Income Tax as well as 2% employee National Insurance. Employers must calculate and deduct the appropriate employee amounts through payroll.
When PAYE Deductions Are Due
Employers must report employees’ pay and deductions to HMRC through Real Time Information. A Full Payment Submission is normally sent on or before each employee’s payday.
The resulting PAYE bill must then usually be paid to HMRC:
- By the 22nd of the following tax month if paying electronically
- By the 19th of the following tax month if paying by post
Employers who usually owe less than £1,500 per month may be able to arrange to pay HMRC quarterly instead.
For quarterly electronic payments, the usual deadlines are:
- 22 July for the period 6 April to 5 July
- 22 October for the period 6 July to 5 October
- 22 January for the period 6 October to 5 January
- 22 April for the period 6 January to 5 April
If paying by post, the corresponding deadline is normally the 19th rather than the 22nd.
Missing reporting or payment deadlines can result in penalties and interest from HMRC, so having payroll software or an accountant to help keep track of PAYE commitments is advisable.
Penalties For Incorrect PAYE Operation
HMRC has the power to impose financial penalties on employers who fail to operate PAYE correctly. Potential infractions include:
- Failing to deduct PAYE and National Insurance correctly from employee wages
- Making errors that lead to deductions being too low
- Not paying PAYE liabilities over to HMRC on time
- Submitting late or inaccurate FPS or EPS payroll reports
- Not keeping adequate PAYE records for each employee
Penalties depend on the type and severity of the failure and can increase where problems are repeated or payments remain outstanding. Interest can also be charged on late PAYE payments. Deliberate tax evasion can potentially result in much more serious enforcement action.
It is therefore vitally important for those running payroll and PAYE to understand and carefully follow HMRC guidance. Keeping detailed records, meeting deadlines and querying issues early are key to avoiding penalties.
Payroll Software To Manage PAYE
Given the level of complexity around operating PAYE and payroll in an HMRC-compliant way, most employers choose to use dedicated software. Options such as Sage Payroll, QuickBooks Payroll, Xero Payroll and Capium Payroll can help with:
- Calculating Income Tax and National Insurance deductions in line with current HMRC guidance
- Generating payslips showing deductions
- Submitting FPS and EPS reports to HMRC through Real Time Information
- Producing P60 and P45 documents
- Keeping payroll records to help employers meet their obligations
This automates much of the PAYE admin burden. The cost of such software is generally modest compared with the potential cost of manual errors or non-compliance penalties. For some growing firms, outsourcing payroll completely can also be worthwhile.
Implications Of PAYE For Employees
While employers have plenty of responsibilities under PAYE, what does being paid under PAYE mean for staff?
The main plus point is simplicity – with deductions made upfront each pay period, employees do not usually need to personally complete annual tax returns or make advance payments of tax during the year. PAYE means the tax due on employment income is generally dealt with through payroll.
The main paperwork most PAYE staff need to worry about is checking their P60 at year end or logging into their HMRC online account to confirm that their pay and tax records are correct. Some employees may also be able to claim tax relief for allowable work expenses.
Employees with more complex tax affairs may still need to complete a Self Assessment tax return. This can include:
- Employees claiming more than £2,500 of allowable employment expenses
- People with significant untaxed income from sources such as rental property, savings, investments or foreign income
- Someone who is self-employed as a sole trader and earns more than £1,000 before expenses alongside their PAYE salary
- Business partners
- People who need to pay Capital Gains Tax through Self Assessment
- People liable for the High Income Child Benefit Charge where it is not being collected through PAYE
Being a higher-rate or additional-rate taxpayer does not by itself automatically mean an employee has to submit a Self Assessment return.
HMRC may identify that an employee has paid too much tax and issue a P800 tax calculation. In many cases, employees are now required to actively claim a PAYE refund through the HMRC app, Personal Tax Account or HMRC’s online service rather than simply waiting for an automatic cheque.
Allowable employment expenses can still result in tax relief. For example, qualifying travel to a temporary workplace may be eligible, although normal commuting between home and a permanent workplace is not.
So while PAYE handles most Income Tax for typical employees, some additional personal tax administration may still be necessary where an individual has other income, expenses or more complex tax affairs.
Disputes Over PAYE Deductions
Sometimes mistakes happen which result in incorrect PAYE deductions being made. Common examples include:
- An employee believes too much tax has been deducted
- An employer has not yet applied updated personal or tax-code information
- Errors in applying the latest HMRC tax code, rates or thresholds
Employees should normally talk directly with their employer in the first instance if they notice payroll issues, as this is often quicker to resolve. Where further investigation is needed, HMRC can clarify the tax code or tax position.
If deductions were incorrect, the position may be corrected through payroll, through an updated tax code or through an HMRC refund depending on the circumstances and when the error is discovered. Equally, underpayments may need to be collected later. It is therefore best for all parties to identify and resolve discrepancies promptly.
Additional PAYE Reporting Considerations for UK Employers
Beyond basic P60 forms and payroll reporting, there are some further HMRC reporting requirements that apply specifically to employers operating PAYE:
Real Time Information (RTI) – Under RTI, employers must electronically submit details of employees’ pay and deductions every time they are paid, normally through a Full Payment Submission on or before payday. Failing to file RTI reports on schedule can trigger penalties.
Form P11D – During 2026/27, employers may still need to use P11D forms to report taxable benefits and expenses that have not already been dealt with through payroll. Employers may also need to submit a P11D(b) and pay Class 1A National Insurance where applicable.
The system is changing from 6 April 2027. Mandatory payrolling will initially apply to benefits including company cars, car fuel, vans and van fuel, and employer-provided medical benefits. From April 2028, mandatory payrolling is due to extend to most remaining benefits in kind, although separate rules will continue to apply to certain benefits.
PAYE For Expat Employees
For UK employers hiring staff abroad or UK-based staff working overseas temporarily, understanding how PAYE applies can be more complex. Double taxation agreements can affect where Income Tax is due, while separate National Insurance and social security rules or agreements can determine where social security contributions are payable. It is important for employers to get specialist guidance when running international or expat payroll to remain compliant.
PAYE and Company Ownership
PAYE can also apply to company directors and business owners who receive a salary through their company. Owning shares in the business does not itself remove someone from PAYE.
However, PAYE generally deals only with employment income processed through payroll. If a company owner also receives dividends, investment income, self-employment income or other taxable income, this may need to be reported separately to HMRC depending on the amount and the person’s circumstances. A Self Assessment tax return may be required in some cases, but receiving dividends or owning shares does not automatically mean one is necessary.
Final Thoughts
In summary, PAYE stands for Pay As You Earn – the system used by UK employers to deduct and report Income Tax and National Insurance in respect of employees on their payroll.
Being paid under PAYE means Income Tax and National Insurance contributions are normally deducted directly from gross wages, with the employer handling the payroll calculations, reporting and payments to HMRC.
For employers, operating PAYE brings responsibilities around deductions, Real Time Information reporting, payment deadlines and record keeping. Using HMRC-recognised payroll software or outsourcing payroll can make it significantly easier to stay on top of these requirements and avoid mistakes or penalties.
So while the intricacies can seem daunting initially, PAYE is fundamentally designed to collect employment taxes throughout the year rather than leaving employees to settle their entire tax liability themselves. Understanding the key responsibilities is vital for both employers and employees.
