B · Registrations & compliance
HMRC Tax Adviser Registration and the Agent Services Account (2026)
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Quick answer
Under the Finance Act 2026, anyone acting as a paid tax adviser to clients must register with HMRC to continue interacting with HMRC on their behalf. Registration opened on 18 May 2026 in three-month windows, with payroll-only advisers joining from 18 November 2026. Advisers who already hold an Agent Services Account generally do not need to re-register.
Key takeaways
- Finance Act 2026 introduces mandatory registration for paid tax advisers dealing with HMRC on behalf of clients.
- Registration opened 18 May 2026, phased through three-month windows.
- Payroll-only advisers have a later start date of 18 November 2026.
- Existing Agent Services Account (ASA) holders do not need to register again.
- Registration sits alongside, not instead of, your professional body membership and AML supervision.
What is the new tax adviser registration requirement?
It is a legal requirement, introduced by the Finance Act 2026, for anyone providing paid tax advice or acting as an agent for clients with HMRC to register with HMRC, regardless of professional body membership.
The aim is to give HMRC visibility of everyone acting as a paid tax adviser, closing a gap where unregulated or unaffiliated advisers could interact with HMRC on behalf of clients with no registration at all. It builds on, but is distinct from, the existing requirement to register for AML supervision.
Who has to register?
Anyone paid to give tax advice or represent a client's tax affairs to HMRC needs to register, including sole practitioners, employees within firms who deal directly with HMRC, and payroll agents.
This covers accountants, tax advisers, bookkeepers who deal with HMRC on tax matters, and payroll bureaux. Purely internal roles that never interact with HMRC on a client's behalf, and unpaid advice (such as helping a family member with no fee charged), generally fall outside scope, but firms should check their own position rather than assume.
What are the registration windows?
Registration opened on 18 May 2026 and runs through a series of three-month windows, with payroll-only advisers starting from a later date of 18 November 2026.
| Date | What happens |
|---|---|
| 18 May 2026 | Registration opens; first three-month window begins for general tax advisers |
| Ongoing | Further three-month windows follow — check GOV.UK for your specific window based on HMRC's phasing |
| 18 November 2026 | Registration opens for payroll-only advisers |
Exact window dates for specific adviser categories should be confirmed on GOV.UK, as HMRC has phased the rollout rather than opening registration to everyone on a single date.
Do I need to register if I already have an Agent Services Account?
No — advisers who already hold an Agent Services Account are generally treated as already known to HMRC and do not need to complete the new registration separately.
This is a helpful simplification for established firms: if you already interact with HMRC through an ASA for services such as MTD for Income Tax, VAT or PAYE, that existing relationship generally satisfies the new requirement without a duplicate process. New entrants without an ASA, or those newly starting to act as paid tax advisers, are the ones who need to actively register.
What are 'relevant individuals' and do they need separate registration?
Where a firm employs staff who personally give tax advice or deal with HMRC, HMRC's framework identifies these as relevant individuals whose fitness may need to be considered as part of the firm's registration.
This is broadly analogous to the 'fit and proper' checks already familiar from AML supervision — the registration is at firm level, but the competence and standing of the individuals actually giving advice can be relevant to it. Firms should keep a clear internal record of which staff members are client-facing on tax matters.
Are there minimum standards to meet?
Yes — the registration framework is intended to confirm advisers meet baseline standards of competence and conduct, rather than simply being a notification exercise.
Members of a recognised professional body who already meet continuing professional development and ethical standards will generally find this straightforward to evidence. Unaffiliated advisers with no professional body membership will need to demonstrate their standards independently as part of the registration process.
How do I actually register?
Registration is completed through HMRC's online service during your allocated window, requiring firm details, relevant individual information and confirmation of your AML supervision status.
- Confirm whether you already hold an Agent Services Account — if so, check whether you are automatically covered
- Identify your registration window on GOV.UK based on your adviser category
- Gather firm details: business structure, AML supervisor, and relevant individuals who give tax advice
- Complete the online registration during your window
- Keep confirmation of registration on file alongside your AML and practising certificate records
What happens if I don't register?
Once your window has passed, HMRC is expected to restrict the ability of unregistered paid tax advisers to interact with HMRC on behalf of clients, so failing to register risks losing the ability to act for clients at all.
This makes registration a practical priority, not just a compliance nicety — an unregistered adviser could find themselves unable to file, correspond, or represent a client with HMRC once enforcement begins.
How Remindoo helps
The rollout of tax adviser registration is happening in windows over several months, which makes it exactly the kind of one-off but easy-to-miss deadline that gets forgotten in the day-to-day running of a practice. Set an automated reminder in Remindoo for your firm's registration window, and for renewing or reviewing that status alongside your other annual compliance dates, so it sits in the same place as your AML and practising certificate reminders rather than as a separate note somewhere. If you have multiple relevant individuals in the firm who give tax advice, roles and permissions in Remindoo let you keep a clear internal record of who is client-facing on tax matters, which is useful evidence to have ready if HMRC or your professional body ever asks about your registration position.
Frequently asked questions
Do bookkeepers need to register under this scheme?
If a bookkeeper provides paid tax advice or represents a client to HMRC on tax matters, they fall within scope. Bookkeeping work with no tax advice element is less likely to be caught, but firms should check their own activities.
Does having a practising certificate exempt me from registering?
No — practising certificates and this HMRC registration are separate requirements. Holding a practising certificate does not itself remove the need to register as a tax adviser under Finance Act 2026.
What if I miss my registration window?
HMRC's guidance indicates continued windows are available, but leaving it too long risks losing the ability to interact with HMRC on behalf of clients, so registering as soon as your window opens is the safer course.
Is there a fee to register?
Fee details should be checked directly on GOV.UK at the time of registration, as this has been subject to updates during the rollout [VERIFY current fee position].
Does this apply to advisers based outside the UK?
The requirement is aimed at anyone acting as a paid agent with HMRC for UK tax matters, regardless of where the adviser is physically based, so overseas-based advisers with UK clients should check their position.
Is this the same as AML supervision registration?
No, they are separate requirements. AML supervision covers your obligations under the Money Laundering Regulations 2017; tax adviser registration is a new, distinct requirement introduced by Finance Act 2026.
Will my clients notice any difference?
Not directly — this is a registration requirement on the adviser, not a change to how clients interact with their accountant, though it should improve overall standards across the market.
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Sources
Last updated 23 September 2026. General guidance, not legal or regulatory advice. Check with your professional body.
