What Is an Accounts Office Reference Number?

An Accounts Office reference number is a 13-character reference issued by HM Revenue & Customs (HMRC) when a business registers as an employer. It identifies the employer's PAYE payment account and helps HMRC allocate payroll tax payments to the correct business. If your UK limited company employs staff or pays a director through a PAYE scheme, you will generally need this reference when paying amounts such as Income Tax and National Insurance contributions deducted or calculated through payroll.

You can usually find your Accounts Office reference on the letter HMRC sends when you register as an employer, in your HMRC online account if you have enrolled for PAYE Online, or in correspondence held by your accountant or payroll provider. The key is not to confuse it with your employer PAYE reference, Company Unique Taxpayer Reference (UTR) or Companies House registration number. These identifiers serve different purposes, and using the wrong one when making a payment can delay its allocation.

What Is an Accounts Office Reference Number?

An Accounts Office reference number is an employer-specific identifier HMRC uses to recognise the account against which PAYE liabilities and payments are recorded. It is associated with an employer's PAYE arrangements and is particularly important when making payments to HMRC outside the online payment process.

For example, if a small business deducts Income Tax and National Insurance from employees' salaries, it must report payroll information to HMRC and pay the amounts due according to the applicable rules. The Accounts Office reference helps HMRC identify the correct employer account when those payments arrive.

The reference is usually 13 characters long. An illustrative example is 123PA00012345, This is a fictional example, not a real employer's reference. The precise characters vary between employers. HMRC's guidance explains that the Accounts Office reference includes an office number, the letter P, a check character and a register number. The exact structure can vary, so use the reference HMRC actually issued rather than attempting to construct one yourself.

What Is an Accounts Office Reference Used For?

The main purpose of an Accounts Office reference is to help HMRC allocate payments to the correct employer's PAYE account. You may need it when:

• Paying PAYE liabilities to HMRC by bank transfer.
• Setting up a Direct Debit to pay an employer PAYE bill.
• Making certain payments by cheque.
• Checking or resolving a payroll payment allocation issue.
• Discussing an employer's PAYE payment record with HMRC.
• Managing payroll through an accountant or payroll bureau.

HMRC requires the 13-character reference, without spaces, when using payment methods such as online or telephone bank transfers and certain other payment routes. If you use the wrong reference, your payment may be delayed or allocated to a different tax bill.

Example: A startup paying its first payroll bill

Imagine a UK limited company has three employees and operates monthly payroll. Each month, it reports their pay and deductions to HMRC and pays the amount due. When the company makes a bank transfer to HMRC, it must use the correct Accounts Office reference. If the director accidentally enters the company's Corporation Tax UTR instead, the payment may not be allocated correctly to the employer's PAYE account.

This is why keeping tax identifiers clearly labelled in the company's records is more than an administrative convenience. It helps prevent payment errors that can take time to investigate and correct.

Where Can You Find Your Accounts Office Reference Number?

If your company already operates PAYE, you can usually retrieve the reference without registering again.

1. Check the HMRC employer registration letter

The first place to look is the letter HMRC sent after your business registered as an employer. The letter normally includes the Accounts Office reference needed to make PAYE payments. If an accountant or tax adviser registered the business on your behalf, HMRC may have sent the letter to them instead.

Search your company's physical files and digital records for correspondence relating to employer registration or PAYE. If the accountant holds the letter, ask them to confirm both the Accounts Office reference and the employer PAYE reference. They are separate numbers, so it is useful to request each one by its full name.

2. Sign in to your HMRC online account

If you have enrolled for PAYE Online, you can find the Accounts Office reference in your HMRC online account. Start here: Sign in using your relevant HMRC account credentials, then look for your employer PAYE service and associated payment information. HMRC confirms that the reference is available online to employers who have enrolled for PAYE Online. If you have more than one PAYE scheme, check that you are looking at the correct employer record. Do not assume every scheme uses the same reference.

3. Ask your accountant or payroll provider

If a payroll bureau or accountant manages your PAYE scheme, it may already hold the reference in its payroll records. Ask the provider to supply the Accounts Office reference and label it clearly. If you are changing accountants, request a handover containing the employer PAYE reference, Accounts Office reference, payroll records and relevant HMRC correspondence.

This is particularly important when payroll is outsourced: you remain responsible for ensuring the business's liabilities are paid correctly, even if someone else handles the day-to-day administration.

4. Check your existing employer records

Your business may have stored the reference in payroll setup documents, payment instructions or correspondence prepared when the PAYE scheme was opened. Check the details carefully before using the number to make a payment. A reference copied from an old record may relate to a different employer or PAYE scheme, particularly if the company has changed its payroll arrangements.

5. Contact HMRC if you cannot find it

If you have checked your registration letter, online account and payroll records but still cannot locate the reference, use HMRC's official employer PAYE and National Insurance payment enquiries page.

HMRC's published contact information lists telephone support for payment enquiries and states that you will need your Accounts Office reference when calling about payment issues. Check the official page for the latest contact details and opening hours. Have your company's legal name, Companies House registration number, employer PAYE reference and any relevant HMRC correspondence available. Do not invent or guess the missing reference.

Accounts Office Reference vs PAYE Reference vs Company UTR

These numbers are often mixed up because they can all appear in a company's tax and payroll records. However, each has a different function.

What is the difference between an Accounts Office reference and a PAYE reference?

The employer PAYE reference identifies the employer record used for payroll reporting. The Accounts Office reference is primarily used to identify the account when paying employer PAYE liabilities to HMRC. HMRC's payroll reporting guidance lists these as separate fields in Full Payment Submissions (FPS) and Employer Payment Summaries (EPS).

What is the difference between an Accounts Office reference and a UTR?

A company UTR is associated with the company's Corporation Tax record. The Accounts Office reference relates to its employer PAYE arrangements. A company may have a Corporation Tax UTR without operating a PAYE scheme. Conversely, an employer's payroll records and tax payments may require an Accounts Office reference separate from its Corporation Tax details.

Practical rule: Never substitute one reference for another just because both were issued by HMRC.

How Do You Use the Accounts Office Reference When Paying HMRC?

When paying employer PAYE liabilities by a method that requires a payment reference, HMRC generally instructs employers to use their 13-character Accounts Office reference without spaces. However, some payments require additional digits.

Standard PAYE payments

For many payment methods, you use the 13-character Accounts Office reference as the payment reference. Check the instructions for your chosen payment method before sending money.

Early or late payments

If you make an early or late payment by Direct Debit, online or telephone bank transfer, or cheque, HMRC says you must add four extra digits to the 13-character reference. Those digits identify the tax year and relevant month or quarter. The required digits change depending on the period being paid.

For example, a monthly payment may require the last two digits of the tax year followed by the number of the tax month. Quarterly payments use the relevant quarter-ending month. Do not reuse a period-specific reference for every payment. Check HMRC's guidance on reference numbers for early and late payments and follow the instructions for your circumstances.

Payments through HMRC's online service

When you pay through HMRC's online payment service, it can calculate the required reference details for you. This can reduce the risk of entering an incorrect period-specific reference.

If you are unsure which payment reference to use, confirm the instructions before transferring funds. A payment leaving your bank account does not necessarily mean it has been allocated to the intended PAYE liability.

What Happens If You Use the Wrong Accounts Office Reference?

Using an incorrect reference can delay payment allocation or cause HMRC to apply the payment to another tax bill owed by the business. If you suspect this has happened, do not immediately pay the same amount again without checking the position. You could end up making a duplicate payment while the original remains unallocated or is applied elsewhere. Instead:

1. Check the reference used in your bank transfer or payment instruction.
2. Review the payment and liability information in your HMRC online account.
3. Confirm whether the payment has been credited to the correct PAYE account and period.
4. Contact HMRC's employer payment enquiries service if the payment needs investigating or reallocating.
5. Keep the bank confirmation and any HMRC correspondence until the issue is resolved.

HMRC specifically advises employers whose payments have been allocated to the wrong tax bill to contact its employer helpline and ask for the payment to be moved.

Do All UK Limited Companies Need an Accounts Office Reference?

No. A company does not automatically need an Accounts Office reference simply because it has been incorporated at Companies House. The reference is associated with employer PAYE arrangements. A company generally needs to register as an employer when its circumstances meet HMRC's PAYE registration requirements, such as when it begins employing staff or paying a director through payroll in circumstances that require PAYE.

If a company has no employees and does not need to operate a PAYE scheme, it may not have an Accounts Office reference. For a new business, it is therefore important to separate incorporation from employer registration. Registering a limited company and obtaining a Corporation Tax UTR do not, by themselves, mean that a PAYE scheme has been opened.

What Should Overseas Founders Know?

Non-UK residents can own UK limited companies, but their companies must still comply with relevant UK tax and payroll obligations. If you manage a UK business from overseas, keep the Accounts Office reference, employer PAYE reference and Corporation Tax UTR in a secure digital record. Make sure your accountant or payroll provider can access the information needed to administer payroll and pay HMRC correctly.

A UK company formation and management platform such as IncorpUK may help international founders organise company administration and registered office arrangements. However, the services provided depend on the relevant package, and directors remain responsible for ensuring that payroll and tax obligations are met.

Frequently Asked Questions

1. How many digits is an Accounts Office reference number?

An Accounts Office reference is generally 13 characters long. It commonly resembles 123PA00012345, although the actual characters depend on the reference HMRC issued to the employer.

2. Is my Accounts Office reference the same as my PAYE reference?

No. The Accounts Office reference is used primarily for PAYE payments, while the employer PAYE reference identifies the employer's PAYE record for payroll reporting. HMRC treats them as separate identifiers.

3. Can I find my Accounts Office reference online?

Yes. If you have enrolled for PAYE Online, HMRC says you can find the reference in your online account. You can also check the employer registration letter or ask your accountant or payroll provider.

4. Where can I find my Accounts Office reference if I have lost the letter?

Check your HMRC online account and any payroll records held by your accountant or payroll provider. If you still cannot find it, contact HMRC through its official employer payment enquiries service.

5. Do I need the Accounts Office reference to pay PAYE?

For payment methods that require a payment reference, HMRC generally instructs employers to use the 13-character Accounts Office reference. Some early or late payments require four additional digits. Follow HMRC's instructions for the particular payment method and period.

6. Can a company have a UTR but no Accounts Office reference?

Yes. A company may have a Corporation Tax UTR without having registered for employer PAYE. The Accounts Office reference is associated with the employer's PAYE arrangements rather than incorporation alone.

7. What should I do if HMRC allocates my payment to the wrong tax bill?

Check your payment records and HMRC account, then contact the employer payment enquiries service to ask HMRC to investigate and reallocate the payment if necessary. Keep evidence of the original transaction.

8. Do I need a different Accounts Office reference for every employee?

The reference relates to the employer's PAYE scheme, not to each individual employee. If your business operates multiple PAYE schemes, make sure you use the reference associated with the correct scheme.

Conclusion

An Accounts Office reference number is an important identifier for employers managing PAYE payments in the UK. It helps HMRC allocate payroll liabilities to the correct employer account and is usually available in your employer registration letter, PAYE Online account or accountant's records.

Keep it separate from your employer PAYE reference, Corporation Tax UTR and Companies House registration number. When paying HMRC, use the correct reference and check whether the payment requires additional digits for an early or late payment. For startups and international founders, maintaining accurate payroll records from the beginning can prevent payment errors and make ongoing tax administration much easier.