HMRC Registration for Payroll Agents Opens 18 November

If your firm provides payroll services to clients, a new HMRC registration requirement could affect how you manage your PAYE responsibilities. The registration window for businesses that provide payroll services only opens on 18 November 2026, giving affected firms three months to apply. 

HMRC’s new mandatory tax adviser registration rules are being introduced in stages. It is important to establish which stage applies to your business, particularly if you provide payroll alongside other accountancy or tax services.  

What is changing for payroll agents? 

HMRC is introducing mandatory registration for tax advisers who interact with HMRC on behalf of clients as part of their business, unless an exemption applies. 

This requirement is not limited to businesses that describe themselves as tax advisers. It can also apply to payroll bureaux, accountants and other businesses that communicate with HMRC about clients’ tax affairs. 

For payroll-only businesses, relevant activities include submitting Real Time Information (RTI) returns, such as Full Payment Submissions (FPS) and Employer Payment Summaries (EPS), submitting year-end PAYE returns, and making PAYE or National Insurance payments to HMRC on clients’ behalf.  

Simply calculating payroll, preparing payslips or providing payroll software does not, on its own, mean a business falls within this payroll registration requirement. What matters is the service you provide and whether you interact with HMRC on behalf of clients. 

When do payroll agents need to register? 

The registration timetable depends on the services your business provides and whether you already have an Agent Services Account (ASA). 

For businesses that only provide payroll services for third-party clients and do not interact with HMRC in any other way, the registration window opens on 18 November 2026 and runs until 17 February 2027.  

However, if your firm also provides services such as Self Assessment or Corporation Tax and interacts with HMRC on behalf of clients, you may fall within an earlier registration phase. You should not assume the November date applies simply because payroll is one of your main services. 

If you already have an ASA, HMRC says you do not need to register again. It will contact you through your account if it needs further information to check that you meet the new conditions.  

Registration is now open for tax advisers in the second phase of the new Modernising and Mandating Tax Adviser Registration (MMTAR) rollout. The phased rollout timetable is: 

• 18 May to 18 August 2026 (already passed)

Unregistered tax advisers without an ASA who interact with HMRC on behalf of clients. 

• 18 August to 18 November 2026

Advisers with a Self Assessment or Corporation Tax account who do not have an ASA. 

• 18 November 2026 to 18 February 2027

Advisers who solely provide professional payroll services. 

• 31 December 2026 to 31 March 2027

Financial services organisations. A full definition for this group has already been published. 

What should payroll businesses do now? 

Although payroll-only agents do not need to wait until November to begin preparing, checking your position now can help avoid last-minute issues. 

Here are four practical steps to take: 

1. Check whether your business is in scope

Review the services you provide and how your firm interacts with HMRC. Consider whether you submit RTI returns, make PAYE payments or carry out other tax-related activities for clients. 

2. Use HMRC’s online checker

HMRC has published an interactive tool to help businesses establish whether they need to register and when their registration window opens. 

3. Check your registration requirements

Registration is free and completed online. HMRC’s guidance sets out the conditions businesses must meet before applying for an ASA. This includes having the required anti-money laundering supervision arrangements in place where applicable.  

4. Plan around the deadline

If the November window applies to your business, make a note of the opening date and the 17 February 2027 deadline. Allow time to gather any information needed for the application and resolve potential issues. 

What happens if you do not register? 

Businesses that are required to register but fail to do so may eventually find their ability to interact with HMRC on behalf of clients restricted. HMRC may also take enforcement action, including financial penalties, where a business continues to operate without meeting its obligations.  

Taking action early can help protect continuity for your clients and reduce the risk of registration becoming a last-minute administrative burden. 

Prepare your payroll practice for the changes 

The new registration requirement is a useful prompt to review your payroll processes, responsibilities and wider compliance arrangements. Understanding your obligations now gives you more time to prepare and keep client services running smoothly. 

Start by checking your position using HMRC’s online tool and confirming which registration window applies to your business. 

At Capium, we understand the importance of efficient payroll processes for accountancy practices. Using connected accounting and payroll software can help organise routine workflows and reduce manual administration, giving your team more time to focus on clients. 

This article provides general information, not legal or tax advice. Check HMRC’s latest guidance to confirm how the requirements apply to your business. 

For further information on the mandatory tax adviser registration requirements, eligibility criteria and registration timetable, Use HMRC’s checker tool to find out if and when you need to register.