HMRC tax adviser registration needs more than an assumption that the process has been completed. For a conveyancing firm, uncertainty about registration can become an operational problem when staff need to deal with HMRC on a client’s behalf.
An experience described at the Law Society’s October 2026 property conference illustrates the concern. A conveyancing solicitor said she had applied to register in July, but discovered three months later, when attempting to make a payment on a probate matter, that HMRC did not recognise her as an agent. She reported having to apply again.
The practical question for other firms is straightforward: what evidence confirms your registration position, and who is responsible for following up an unresolved application?
Why HMRC tax adviser registration matters for conveyancers
A firm does not need to offer specialist tax planning to fall within the registration regime. HMRC’s guidance expressly identifies submitting SDLT returns, dealing with HMRC about clients’ SDLT liabilities and making tax payments on their behalf as activities that can bring conveyancers within scope.
The requirement depends on the activities undertaken and the applicable exceptions, rather than the professional title the firm uses.
HMRC also explains that outsourcing the filing does not remove the registration requirement where the conveyancing firm continues to make the SDLT payment on the client’s behalf.
Check the firm’s position against HMRC’s guidance on who must register, including its specific conveyancing examples.
Distinguish an application from a confirmed registration position
The reported experience does not establish that every application is encountering the same problem. It does demonstrate why firms should retain evidence and investigate uncertainty rather than rely on recollection or an informal assumption.
A useful registration record should identify:
- The legal entity to which the application relates.
- Whether the firm already has an Agent Services Account.
- The application date and any reference supplied.
- Outstanding requests for information or action.
- The status shown through HMRC’s application progress service.
- Correspondence confirming the outcome or explaining an unresolved issue.
- The person responsible for follow-up and the next review date.
HMRC’s Agent Services Account application guidance includes a link for checking an existing application’s progress. Use that route and resolve discrepancies through the appropriate HMRC channel.
Do not assume that an existing SDLT online account answers the separate question of whether the firm has the required Agent Services Account and registration position.
Check the registration window applying to your firm
The registration requirements have been introduced in stages. Firms should establish which arrangements apply to their circumstances rather than work from a deadline quoted in an older article or webinar.
HMRC’s current guidance explains the different registration windows, the application period and the position while an application is being considered.
Use HMRC’s registration checker and timetable to establish the relevant position. If the firm already has an Agent Services Account, check the applicable arrangements before starting another application.
Where registration is proving difficult, retain the evidence of the steps taken, outstanding questions and communications with HMRC.
Put responsibility into the SDLT policy
Registration should have a named owner within the firm. A fee earner preparing a return should know whom to contact if the account status, submission route or authority to interact with HMRC is unclear.
The SDLT policy should explain who maintains the registration record, monitors correspondence, coordinates information from relevant individuals and escalates problems that could affect client work.
Lexsure’s Knowledge Hub includes suggested wording on Internal Compliance: HMRC Tax Adviser Registration. This provides a starting point for documenting responsibility and reviewing the accuracy and validity of the firm’s registration arrangements.
There is also wording on Mandatory HMRC Registration and Compliance Standards, addressing registration responsibilities and related compliance considerations.
Adapt any proposed wording to your practice. The allocation of responsibility in a template needs to match the people who actually maintain the account, receive correspondence and make decisions.
Keep registration and AML supervision evidence together
HMRC’s application guidance requires information about the firm’s anti-money laundering supervisory body and proof of supervision. It also states that an application for AML supervision must have been approved before the firm applies for an Agent Services Account.
Check that the supporting information identifies the correct entity and is current. Allocate responsibility for responding if HMRC requests further information.
Registration records, AML supervision evidence and the firm’s internal compliance responsibilities should be easy to locate. Staff should not have to reconstruct the position from several inboxes when a transaction needs attention.
Explain the scope of the firm’s tax work accurately
Registration as a tax adviser does not, by itself, define the scope of the firm’s retainer or establish that it offers every form of tax advice.
Client-facing wording should explain what the firm will do, which matters require specialist advice and how that advice will be arranged. It should accurately reflect the work undertaken and the firm’s competence.
The Hub paragraph on HMRC Registration as Tax Adviser offers terms and conditions wording to consider when explaining registration and the scope of services to clients.
Only state that the firm is registered once its position has been established. A limitation in the engagement letter should also be reviewed against the duties arising from the work the firm actually undertakes.
Review the wider SDLT process
Registration is one part of the firm’s SDLT controls. Calculation reviews, client information, relief decisions, submission, payment and evidence of completion still need attention.
Our main guide, Stamp Duty Land Tax Policy: What CQS Firms Should Update in 2026, brings together registration responsibilities, calculation checks, pre-exchange evidence and escalation procedures.
For the underlying documentation framework, read our earlier article on preparing a CQS Stamp Duty Land Tax policy.
Our updated guide to SDLT risks for conveyancing lawyers also considers client questions, changing circumstances and calculation records.
Review your firm’s SDLT policy
Lexsure’s CQS CPMS Stamp Duty Land Tax Policy template provides a drafting starting point covering calculations, pre-exchange checks, post-completion checks and auditing SDLT calculations and advice.
Use it alongside the relevant registration paragraphs and current HMRC guidance, adapting the procedures to your firm’s work and responsibilities.
Can the firm demonstrate its registration position?
A useful management check is to ask the person responsible to produce the registration record, explain any outstanding issue and identify the next action.
That simple exercise can reveal whether the firm has confirmed its position or merely assumed that someone else completed the process. Where uncertainty remains, investigate it, record the response and consider the implications for affected client work.
Registration guidance checked on 8 October 2026. Use HMRC’s current guidance to establish the arrangements applying to your firm.