Agent Services Accounts, AML Supervision and the 2026 Registration Changes: What You Need to Know

If you act as a tax agent, payroll provider or adviser, the regulatory landscape is tightening. HMRC is strengthening the connection between Agent Services Accounts, anti-money laundering supervision and the new mandatory tax adviser registration regime coming into force in 2026.

These are separate requirements, but they are increasingly interconnected. Getting one wrong can block access to services or expose your practice to compliance risk.

What Is an Agent Services Account?

An Agent Services Account, commonly referred to as an ASA, is the digital gateway that allows agents to access modern HMRC services such as Making Tax Digital and other online client authorisations.

To create an ASA, you must first register with HM Revenue and Customs as a tax agent. During this process, you will be asked to confirm your AML supervisory details.

This is where confusion often arises.

Holding an ASA does not mean you are automatically supervised under anti-money laundering legislation.

Anti-Money Laundering Supervision Is a Legal Requirement

Under the Money Laundering, Terrorist Financing and Transfer of Funds (Information on the Payer) Regulations 2017, many accountancy service providers, tax advisers and payroll businesses must be registered for AML supervision before they begin trading.

Supervision can be provided by:

• HMRC directly, or

• A recognised professional body such as a chartered institute.

Operating without valid AML supervision is a criminal offence. It is not a paperwork formality. It is a statutory obligation.

Importantly, HMRC’s agent registration systems now require confirmation of your AML supervisor as part of the ASA journey. If your supervision is not in place, your agent access may be delayed or refused.

2026: Mandatory Registration for Tax Advisers

From 18 May 2026, HMRC will introduce a mandatory registration regime for tax advisers. A further phase will apply from 18 November 2026 for certain payroll-only service providers.

This regime is separate from AML supervision. However, in practical terms, firms will need to ensure:

• AML supervision is valid and up to date

• Agent Services Accounts are correctly set up

• Mandatory tax adviser registration is completed

• Internal governance and client due diligence processes are robust

The direction of travel is clear. HMRC expects greater transparency, traceability and professional accountability across the tax advice sector.

Practical Implications for Small Practices and Payroll Providers

For small firms and sole practitioners, particularly those offering payroll and tax services alongside bookkeeping, the risk lies in assuming that “being set up with HMRC” covers everything.

It does not.

You should review:

1. Who supervises your practice for AML purposes

2. Whether your supervision is current and renewed

3. Whether your ASA details reflect accurate supervisory information

4. Whether you are within scope of the 2026 tax adviser registration regime

Payroll services alone do not automatically remove AML obligations. The determining factor is the nature of the services provided, not the job title.

Why This Matters

Regulatory frameworks are moving towards stronger professional oversight. That is not accidental. The UK remains committed to international AML standards and tax compliance transparency.

For responsible firms, this is not something to fear. It is an opportunity to demonstrate:

• Professional integrity

• Sound governance

• Client protection

• Credibility in a tightening marketplace

Firms that take compliance seriously are better positioned for growth, partnerships and long-term resilience.

If you would like TCW to review your AML supervision position, Agent Services Account setup or readiness for the 2026 tax adviser registration requirements, we can provide a structured compliance health check tailored to your practice.

Clarity now prevents disruption later.