Hiring your first employee is an important milestone. It means the business is growing, but it also creates a new set of responsibilities with HM Revenue & Customs (HMRC). Before paying employees, most businesses need to register as an employer with HMRC and set up PAYE (Pay As You Earn). PAYE is the system employers use to report employees' pay and deductions, including Income Tax and National Insurance, to HMRC.

The process is straightforward when handled in the right order. The difficulty usually comes later: running payroll correctly, meeting reporting deadlines, keeping records and dealing with workplace obligations that sit alongside tax compliance. This guide explains how employer registration works, when you need to register, what information you need, what happens after registration and the common mistakes new employers should avoid.

What Does It Mean to Register as an Employer?

Registering as an employer means telling HMRC that your business will employ people and operate PAYE. Once registered, HMRC gives the employer the information needed to operate its PAYE scheme. The business then has to report employees' pay and deductions through payroll. You may need to operate PAYE even if you are not employing a traditional full-time workforce. PAYE can apply to:

• Full-time employees
• Part-time employees
• Temporary employees
• Directors of a limited company
• Some contractors, depending on their employment status
• Workers receiving taxable benefits or other payments

Whether you actually need to register depends on the circumstances of the people you pay and the amounts involved.

When Do You Need to Register as an Employer?

You generally need to register with HMRC if you start employing someone and need to operate PAYE. This can apply where an employee is paid at or above the relevant threshold, receives expenses or benefits, or has another circumstance that requires PAYE reporting.

You should register before the first payday where you will need to operate PAYE. It is better not to wait until the payroll is due. Employer registration, payroll setup and employee onboarding all require information and preparation.

A simple example

Imagine a new UK limited company hires its first employee on 1 October. The employee is paid monthly, with the first payday on 31 October. The company should establish its employer obligations and register for PAYE well before that first payment rather than waiting until the end of October. The registration is only the beginning. The company must then operate payroll and submit the required information to HMRC.

How to Register as an Employer With HMRC

For most employers, the registration process is completed online through GOV.UK. Before starting, gather the information you are likely to need.

Information you may need

This can include:

• The company's legal name
• Company registration number
• Unique Taxpayer Reference (UTR)
• Business address
• Details of the person responsible for payroll
• Expected number of employees
• Expected first payday
• Details about directors where relevant
• Business contact information

The exact questions HMRC asks can depend on the circumstances of the employer.

Allow time for the registration

Do not leave employer registration until payday. HMRC's registration process can involve receiving PAYE scheme information that you will subsequently need when setting up payroll and communicating with employees or payroll providers.

What Is a PAYE Reference?

One of the most important pieces of information you receive after registering as an employer is your PAYE reference. It identifies the employer's PAYE scheme. You may see it written in a format similar to: 123/AB456, The exact format can vary. Do not confuse the PAYE reference with the company's:

• Company registration number
• Corporation Tax UTR
• VAT number
• Accounts Office reference

These are different identifiers used for different purposes. Your PAYE reference is particularly important when dealing with payroll matters and HMRC.

What Is the Accounts Office Reference?

Employers also receive an Accounts Office reference. This is used when making certain PAYE payments to HMRC. The PAYE reference and Accounts Office reference serve different purposes, even though both relate to the employer's PAYE scheme. This distinction matters because using the wrong reference when making a payment can make it harder for HMRC to allocate the payment correctly.

Keep both references securely

Once you receive your PAYE information, store it alongside the company's other tax records. A sensible compliance folder should contain:

• Corporation Tax UTR
• PAYE reference
• Accounts Office reference
• VAT number, if applicable
• Companies House information
• Payroll records
• HMRC correspondence

What Happens After You Register?

Registering as an employer does not mean your PAYE responsibilities are complete. You now need to establish a payroll system. Every payday, you will generally need to calculate and report information such as:

• Employee gross pay
• Income Tax deductions
• National Insurance deductions
• Net pay
• Employer National Insurance where applicable
• Statutory payments
• Other payroll deductions

The employer normally reports payroll information to HMRC through a Full Payment Submission (FPS). The FPS tells HMRC what you paid employees and what deductions were made.

Setting Up Payroll After Employer Registration

You can operate payroll yourself or use a payroll professional or software provider. There is no single correct choice. The right approach depends on the size and complexity of the business.

Option 1: Run payroll yourself

This can work for a small company with one or two straightforward employees. You need to understand:

• PAYE tax codes
• National Insurance
• Payroll calculations
• FPS submissions
• PAYE payment deadlines
• Statutory payments
• Year-end payroll procedures
• Payroll record keeping

Free or commercial payroll software may help with calculations and submissions.

Option 2: Use payroll software

Payroll software can automate much of the calculation and reporting process. This is often useful as the workforce grows. However, software does not remove the employer's responsibility to enter correct information. A payroll system can accurately process the wrong salary, tax code or employee details just as efficiently as the right ones.

Option 3: Use an accountant or payroll bureau

For businesses with multiple employees, directors, benefits or more complicated payroll arrangements, outsourcing can reduce administrative work. Even then, the employer should understand what is being filed and when.

What Information Do You Need From Employees?

Before putting someone on payroll, you will need appropriate employee information. This commonly includes:

• Full name
• Date of birth
• Address
• National Insurance number
• Starter information
• Tax code information
• Bank details for salary payments
• Employment details

You should also establish whether the person is an employee, worker or genuinely self-employed contractor. That classification is important because calling someone a "contractor" does not automatically make them self-employed for tax purposes.

Registering a Director for PAYE

A limited company director is a special case. Directors are generally treated as employees for PAYE purposes, even though their employment status has specific rules. If a director receives salary or other taxable remuneration, the company may need to operate PAYE. This is particularly relevant for owner-managed companies.

Example

A founder incorporates a UK company and becomes its only director. The founder then decides to pay themselves £1,500 every month from the company. They should not simply transfer £1,500 from the business bank account and describe it as a salary without establishing the appropriate payroll treatment.

If the payment is remuneration, payroll and PAYE obligations may apply. This is one reason it is useful to establish the company's payroll structure before the first director payment.

Do You Need to Register if You Only Have One Employee?

Potentially, yes. The number of employees is not the main test. A company with one employee can still have an employer PAYE obligation. In fact, many small limited companies start their payroll journey with just one person, the director. The important question is whether the company needs to operate PAYE based on what it pays and the circumstances of the person receiving it.

Can You Employ Someone Without Registering for PAYE?

In some limited circumstances, you may not need to register for PAYE. For example, if an employee earns below the relevant thresholds and does not have taxable benefits or expenses that trigger reporting requirements, PAYE registration may not be necessary.

However, the rules depend on the circumstances and thresholds can change. If you are uncertain, check the current HMRC guidance before making the first payment. The mistake to avoid is assuming that "small salary" automatically means "no payroll obligations."

PAYE Deadlines You Need to Understand

Employer compliance does not end with submitting payroll. You also need to pay the amounts owed to HMRC. For most employers, PAYE and National Insurance deductions are normally paid to HMRC by the 22nd of the month when paying electronically, or by the 19th when paying by cheque.

The exact payment arrangements can differ for smaller employers and particular circumstances, so employers should check their applicable HMRC schedule. The important distinction is between:

Payroll reporting deadline — when payroll information must be submitted.

Tax payment deadline — when the money deducted and employer liabilities must reach HMRC. Confusing these two is a common administrative mistake.

What Happens if You Register Late?

Registering late can create unnecessary problems. Depending on the circumstances, you may need to:

• Register retrospectively
• Submit late payroll information
• Correct payroll records
• Pay tax and National Insurance that should already have been accounted for
• Deal with interest or penalties where applicable

If you realise you should have registered earlier, do not simply continue paying employees and hope the issue disappears. Contact HMRC or your payroll adviser and establish exactly what needs to be corrected. The earlier the problem is addressed, the easier it generally is to reconstruct the payroll accurately.

Common Employer Registration Mistakes

Registering after the first payday

Employer registration should be dealt with before you need to operate PAYE.

Using the wrong HMRC reference

The PAYE reference, Accounts Office reference, Corporation Tax UTR and company number are not interchangeable.

Paying directors outside payroll

Calling a payment a "drawing" does not automatically determine its tax treatment.

Getting employee status wrong

A worker cannot necessarily be treated as self-employed simply because they invoice the business.

Forgetting payroll after registration

Registration does not automatically submit payroll information every month.

Missing HMRC correspondence

HMRC may contact employers about PAYE discrepancies, late submissions or other issues. Ignoring correspondence can make a manageable problem considerably harder.

Assuming an accountant has handled everything

If payroll is outsourced, establish exactly what the adviser handles and what remains the company's responsibility.

Employer Registration for Overseas Company Owners

The process can feel more complicated for founders who live outside the UK but operate a UK company. An overseas director can run a UK company, but employing people in the UK can create additional administrative considerations. The company may need to establish:

• Whether it has UK employees
• Whether PAYE applies
• Where employees perform their duties
• Which payroll reporting obligations apply
• Whether National Insurance is due
• Whether other employment taxes or benefits need consideration

This is particularly important where a global founder hires a UK-based employee while managing the business from another country. The company's UK payroll responsibilities should be assessed based on the actual employment arrangement rather than simply where the director lives.

A Practical Employer Registration Checklist

Before hiring your first employee, work through this checklist.

Before the first payday

• Confirm the person's employment status.
• Determine whether PAYE registration is required.
• Register as an employer with HMRC.
• Set up payroll software or appoint a payroll provider.
• Collect employee starter information.
• Establish the employee's pay and benefits.
• Set up a payroll calendar.
• Create a system for storing payroll records.

Every payday

• Calculate gross pay.
• Apply the correct tax code.
• Calculate deductions.
• Submit the required payroll report.
• Pay the employee.
• Record payroll transactions accurately.

Every month

• Check PAYE and National Insurance liabilities.
• Pay HMRC by the applicable deadline.
• Reconcile payroll with the company bank account.
• Review HMRC payroll messages.

Periodically

• Review employee details.
• Check tax codes.
• Review payroll software settings.
• Reconcile payroll records.
• Keep records up to date.

FAQ: Registering as an Employer

How do I register as an employer with HMRC?

You can register online through GOV.UK. You will need information about your business and the people responsible for operating payroll.

How long does it take to register as an employer?

The registration process itself can be completed online, but you should allow sufficient time to receive and organise your PAYE scheme information before your first payday.

Do I need to register for PAYE if I only employ one person?

Possibly. Having only one employee does not automatically remove the need to operate PAYE. The employee's pay and circumstances determine whether registration is required.

Does a company director need to be on PAYE?

Directors are generally treated as employees for PAYE purposes. Whether and how payroll applies depends on what the director receives and the company's circumstances.

What is a PAYE reference?

A PAYE reference identifies an employer's PAYE scheme. It is different from the company's Corporation Tax UTR and Companies House registration number.

What is an Accounts Office reference?

The Accounts Office reference is used when making certain PAYE payments to HMRC. It should not be confused with the PAYE employer reference.

Can I run payroll myself?

Yes. A small business can run its own payroll using suitable payroll software, provided it understands and meets its reporting and payment obligations.

What happens if I register as an employer late?

You may need to register retrospectively and submit any outstanding payroll information. Depending on the circumstances, interest or penalties may also apply. Deal with the issue promptly rather than delaying further.

Do overseas directors need to register as UK employers?

If a UK company employs people and needs to operate PAYE, the company may need to register as an employer regardless of where its director lives. The specific employment arrangement should be assessed carefully.

Conclusion

Registering as an employer is one of the first important compliance steps a growing UK business encounters. The process itself is usually straightforward: establish whether PAYE applies, register with HMRC, set up payroll, collect the right employee information and make the required reports and payments.

The real challenge is consistency. A company that registers on time but then misses payroll submissions, uses incorrect tax codes or pays HMRC late can still face compliance problems. Likewise, a founder who pays themselves informally without considering director payroll rules can create avoidable complications.

The safest approach is to treat employer registration as the beginning of a payroll system, not a one-off formality. Keep your PAYE and Accounts Office references secure, maintain accurate payroll records, monitor deadlines and get professional advice when employment arrangements become more complex. For new companies, good payroll administration is not just about paying people correctly. It is about creating a reliable system that keeps the business, its employees and its HMRC obligations aligned from the first payday onward.