SDLT specialist Compass explains why HMRC’s upcoming requirements for conveyancers to register as tax advisers fundamentally shifts the landscape of the service.
For years, SDLT has sat in an uncomfortable space for law firms. It is routinely handled as part of conveyancing, often described as administrative, and frequently excluded from engagement letters as tax advice. Yet in practice it involves calculating tax, applying reliefs, making declarations to HMRC, and submitting a return that asserts a definitive tax position.
That tension has always existed. What is changing now is that it is becoming much harder to ignore.
Why SDLT has never been truly administrative
Completing an SDLT return is not a clerical act. It requires decisions about classification, reliefs, surcharges, and liability. The moment a firm determines the amount of tax due and submits it on behalf of a client, it is making a statement of tax liability that the client relies upon.
Disclaimers help, but they do not override conduct. Courts, insurers, and regulators consistently look at what a firm actually does rather than how it labels the work. If a client suffers loss due to an SDLT error, the argument that no tax advice was given is rarely decisive on its own.
This is why SDLT continues to feature in professional indemnity claims despite best efforts to ring fence it.
Why the new HMRC registration regime changes the risk profile
The upcoming introduction of mandatory tax adviser registration fundamentally shifts the landscape.
Once a firm is registered with HMRC as a tax adviser, it becomes increasingly difficult to argue that SDLT work is not tax advice in substance. Registration is not just an administrative step. It is an acknowledgement of role.
That acknowledgement matters.
It strengthens arguments around duty of care, increases insurer scrutiny, and weakens the already fragile distinction between providing legal services and determining tax liability. Even where a firm believes it is simply facilitating a process, registration signals that HMRC regards the firm as part of the tax advisory ecosystem.
In short, what was previously a grey area becomes much clearer and much riskier.
The limits of engagement letters and disclaimers
Many firms rely on engagement letters to exclude tax advice. This remains sensible, but it is not a complete shield.
If a firm calculates SDLT, submits the return, and interacts with HMRC, the practical reality is that the client is relying on the firm’s determination of their tax position. That reliance exists regardless of the wording used in the retainer.
Insurers understand this. So do claimants.
As SDLT rules have grown more complex, and as reliefs and surcharges have multiplied, the cost of getting it wrong has increased. Errors often surface years later, at precisely the point when memories have faded and staff have moved on.
Why this is ultimately about role clarity
The core issue is not whether law firms are capable of calculating SDLT. Many are. The issue is whether they should be carrying the regulatory and liability burden that comes with doing so.
There is a growing recognition that the cleanest risk structure is one of role separation. Legal work remains with the law firm. Tax determination sits with a specialist provider whose sole focus is tax, whose systems are built for accuracy and auditability, and whose indemnity is aligned to the tax risk itself.
That structure benefits everyone. Clients receive more certainty. Firms reduce exposure. Insurers gain clarity.
A moment for deliberate choice
The introduction of mandatory tax adviser registration forces an uncomfortable but necessary question.
Do law firms want to be tax advisers in substance as well as name, carrying the associated liability and regulatory burden, or do they want to remain firmly within their legal role while relying on specialist, indemnified tax solutions?
Doing nothing is also a decision. But it is increasingly the riskiest one.
About the author
Compass provides specialist Stamp Duty Land Tax services to property professionals, ranging from risk screening to fully outsourced SDLT handling. Its Concierge service includes assessment, expert indemnified calculation, client liaison, and HMRC submission.
One Response
This really is a step too far. Had I wanted to give tax advice then I would have trained as an accountant . How many times have I recommended that clients take specialist tax advice and they do not. I do not want to take on the risk on a complex tax calculation when clearly I do not have the expertise. So my decision is to retire.