How to Register as an Employer with HMRC (PAYE)

Hiring your first employee is a milestone, but it comes with serious legal responsibilities—starting with getting set up as an employer with HMRC. If you miss a step, you risk fines, payroll chaos, and staff frustration. This guide gives you the plain-English, up-to-date, UK-specific roadmap to registering as an employer for PAYE, so you can pay your team correctly, comply with the law, and avoid the common traps that trip up new employers.

You need to register as an employer with HMRC if you’re paying anyone—including yourself, if you’re a director—above the National Insurance (NI) lower earnings limit, or if you’re deducting tax or NI from pay. As of April 2026, the NI lower earnings limit is £123 per week. Even if your employee earns less, registration is mandatory if they have another job, receive a pension, or if you are providing them with expenses and benefits.

HMRC requires you to register before the first payday. The lead time is critical: registration can take up to 15 working days, so you must plan ahead. This applies to all business structures—sole traders, partnerships, and limited companies. Don’t assume you’re exempt if you’re only hiring family or part-time staff; the rules apply universally.

Common triggers that mean you must register include hiring someone for the first time, paying yourself as a director (even if it’s just above the NI threshold), and taking on casual or seasonal workers. If your business uses contractors who fall inside IR35, you may also need to operate PAYE for them. Not registering in time can lead to automatic penalties, backdated tax demands, and problems for your employees with their tax records.

• Register if you pay anyone above £123 per week (2026/27 NI threshold)
• Directors paying themselves above the threshold must register
• Registration needed for staff receiving expenses or benefits
• All business types—sole trader, limited company, partnership—are included
• You must register before your employee’s first payday

PAYE stands for ‘Pay As You Earn’, HMRC’s system for collecting Income Tax and National Insurance directly from employee wages. As an employer, it’s your legal duty to operate PAYE if any employee earns above the thresholds. Through PAYE, you deduct tax and NI before paying your staff, then pay these sums to HMRC—alongside employers’ NI contributions.

PAYE ensures your employees’ tax affairs are kept up to date, and their entitlements—like pensions, benefits, and sick pay—are protected. Failing to operate PAYE exposes you to penalties and could leave your staff with tax debts or gaps in their NI records, affecting their state pension and benefits.

The PAYE system also covers statutory payments, such as Statutory Sick Pay (SSP), Statutory Maternity Pay (SMP), and student loan deductions. You’re legally obliged to calculate and report these through your payroll. If you pay employees cash-in-hand or outside PAYE, you risk severe penalties, criminal charges, and reputational damage.

Before you start the HMRC registration process, get your key information in order. This will save time and reduce the risk of errors or delays. HMRC expects accurate details about your business, employees, and payroll processes.

You’ll need your business’s legal name, trading name (if different), address, and contact details. For companies, you’ll need your Companies House number and the date you started trading. Sole traders and partnerships must have their Unique Taxpayer Reference (UTR). You’ll also need your business’s bank account details, as HMRC may use these for reference.

If you have staff already lined up, gather their full names, addresses, dates of birth, NI numbers, and start dates. Even if you’re not sure of all employees yet, have your own details ready if you are the first employee or director. If you’re planning to use a payroll agent or accountant, get their details too. You’ll also need to know your planned first payday, as HMRC uses this to set up your PAYE scheme.

• Legal business name and registered address
• Companies House registration number (if applicable)
• Unique Taxpayer Reference (UTR)
• Business bank account details
• Employee details (name, NI number, start date)
• Planned first payday
• Payroll agent/accountant details (if using one)

Registering for PAYE is done online, via the HMRC website. The process is fairly straightforward if you’re prepared, but can be confusing if you’re not sure which options to select—especially for limited companies or if you’re both director and employee. Below is a detailed, step-by-step breakdown of the process, tailored for UK small businesses.

You can register yourself, or your accountant can do this for you if you’ve given them the proper authority. Either way, keep records of all reference numbers and confirmation emails. Registration is free, but missing deadlines or providing incorrect information can have costly consequences.

Once you’ve received your PAYE reference numbers from HMRC, you’re legally required to operate payroll in line with UK rules. This means calculating the correct tax, NI, and any other deductions for each employee, issuing payslips, and reporting to HMRC every time you pay staff using Real Time Information (RTI) submissions.

You’ll need payroll software that’s compatible with HMRC’s RTI system. Many small businesses use commercial software like Sage, QuickBooks, Xero, or free options like HMRC’s Basic PAYE Tools (suitable for up to 10 employees). Your payroll system must track all payments, deductions, statutory pay, and generate the required reports for HMRC and your staff.

You must pay your PAYE liabilities—tax, NI and student loan deductions—to HMRC by the 22nd of the following tax month if paying electronically, or by the 19th if paying by post. Late payments incur penalties and interest. You’ll also need to submit annual reports (P60s, P11Ds) and provide employees with these documents by statutory deadlines.

• Submit an RTI Full Payment Submission (FPS) every time you pay employees
• Provide payslips showing all deductions
• Pay HMRC by the 22nd of the following tax month (electronic payment)
• Submit annual P60s to employees by 31 May
• File P11Ds for expenses/benefits by 6 July if relevant

Many small business owners fall into traps when registering as an employer or running PAYE for the first time. The most common is missing the registration deadline, which can mean you’re unable to pay staff on time and may face penalties for late or incorrect Real Time Information (RTI) submissions.

Another frequent error is entering incorrect business or employee details during registration—such as the wrong UTR, postcode, or Companies House number. HMRC systems are sensitive to mismatches, which can delay your PAYE setup and even trigger compliance checks.

Not choosing the right payroll software catches many out. Relying on spreadsheets or manual calculations risks errors in tax and NI, missed deadlines, and problems with RTI returns. Using HMRC’s Basic PAYE Tools is fine for micro-businesses, but anything more complex usually requires paid software or professional help. Finally, forgetting to authorise your accountant or payroll agent properly can leave you stuck at the registration stage.

• Registering too late—apply as soon as you decide to hire
• Inputting the wrong company or UTR details
• Not updating HMRC if your payroll agent changes
• Trying to run payroll without compliant software
• Failing to submit RTI on or before each payday
• Not keeping payroll records for the required 3 years

Registering as an employer isn’t just for businesses with lots of staff. If you’re a limited company and pay yourself as a director—even if you’re the only employee—you must register for PAYE if you pay yourself above the NI threshold. Many directors pay themselves a ‘tax-efficient’ low salary, but if it’s above £123/week (2026/27), registration is compulsory.

If you employ family members, the same rules apply as for any other staff. HMRC doesn’t make exceptions for spouses, children, or relatives. You must pay at least the National Minimum Wage (unless they’re genuinely volunteers or shareholding directors), operate PAYE, and report their pay. Employing casual or seasonal staff—such as summer workers or Christmas temps—also triggers the need to register if they exceed the relevant thresholds.

If you only use contractors or freelancers, you generally don’t need to register for PAYE—unless they fall inside IR35, in which case you are responsible for PAYE deductions. HMRC’s rules on employment status are complex, so seek advice if you’re unsure whether someone counts as an employee, worker, or contractor.

Failing to register as an employer on time can have serious consequences. You won’t be able to operate PAYE, which means you can’t legally pay staff. This can lead to staff not receiving payslips, tax and NI not being deducted, and employees being incorrectly taxed or missing out on NI credits for benefits or the State Pension.

HMRC imposes penalties for late or missed RTI returns—even if you haven’t paid anyone yet. These start at £100 per month for small employers and quickly escalate. If you continue to operate without registration, you risk investigation for tax evasion, with potential criminal penalties, backdated tax bills, and reputational harm to your business.

Late registration can also cause practical headaches: you may be unable to pay staff on time, or you could end up needing to run ‘emergency tax codes’ that result in incorrect deductions. Employees may lose trust, and you may find it harder to attract and retain good staff.

• Automatic £100+ penalties per late RTI submission
• Staff not receiving correct tax/NI credits
• Backdated tax and NI demands from HMRC
• Inability to submit payroll or pay staff legally
• Potential criminal investigation for deliberate non-compliance

If your circumstances change—such as stopping employing staff, switching payroll agents, or closing your business—you must inform HMRC and close or amend your PAYE scheme. This avoids continued obligations and potential penalties for missed submissions.

To close your PAYE scheme, submit a final Full Payment Submission (FPS) to HMRC, marking it as your last. You should provide P45s to any employees leaving, submit a final Employer Payment Summary (EPS), and ensure all outstanding PAYE liabilities are paid. If you take on new staff in the future, you’ll need to register again.

If you’re changing payroll agents or software, update your agent authorisation in your HMRC online account and check that new software is RTI-compatible. Failing to update these details can result in missed submissions or data being sent to the wrong place, causing confusion and potential penalties.

• Submit a final FPS and mark as last if closing scheme
• Provide P45s to departing employees
• Settle all PAYE liabilities before deregistering
• Notify HMRC of changes to payroll agent or software
• Re-register if you employ staff again in future

Registering as an employer and running PAYE can feel daunting, but there’s plenty of help available. HMRC offers online guides, webinars, and a dedicated Employer Helpline (0300 200 3200). Their Basic PAYE Tools software can help very small businesses run compliant payroll for up to 10 staff, though it’s limited in features compared to commercial solutions.

If you’re unsure about your obligations, consider joining the Federation of Small Businesses (FSB), which provides members with payroll and tax advice. Many accountants and payroll bureaux offer PAYE setup and ongoing payroll services for a fixed monthly fee—often saving time, stress, and reducing the risk of mistakes.

For complex cases—such as IR35, international staff, or benefits in kind—get professional advice early. Mistakes can be costly and time-consuming to fix. The HMRC website (gov.uk) is the definitive source for up-to-date rules, rates, and deadlines.

• HMRC Employer Helpline: 0300 200 3200
• Online guides and webinars at gov.uk
• HMRC Basic PAYE Tools (free for up to 10 employees)
• Federation of Small Businesses (FSB) payroll support
• Professional accountants and payroll services