HMRC announces new Stamp Duty Land Tax (SDLT) registration rules for law firms
From May 2026, HMRC is introducing a new registration requirement for law firms and conveyancers submitting Stamp Duty Land Tax (SDLT) returns on behalf of clients.
These changes were set out in the Finance Bill 2025-26 and will classify SDLT submissions as a form of tax advice.
As a result, any professional filing SDLT returns will need to register with HMRC as a tax adviser in order to continue carrying out this work.
This is a big change for legal practices that have traditionally treated SDLT filing as an administrative step within a property transaction.
What are the new SDLT requirements?
Under the new regime, any solicitor or conveyancer submitting SDLT returns must complete a digital registration process with HMRC.
Registered advisers will need to confirm they meet specific eligibility criteria, including having these requirements in place:
- No outstanding tax liabilities
- No relevant criminal convictions
- Appropriate Anti-Money Laundering (AML) supervision
Firms will also be required to make annual declarations confirming their continued compliance with HMRC’s standards.
Financial penalties for non-compliance are expected to be significant, with fines of £5,000 for initial breaches and up to £10,000 for repeated failures.
HMRC has confirmed that firms will have at least a three-month window to complete registration once the system goes live.
What do the new SDLT rules mean for law firms?
The upcoming changes will require firms to assess how they approach SDLT.
Firms will need to consider:
- Who within the organisation will be required to register
- Whether registration applies
- Whether existing AML policies and compliance frameworks meet HMRC standards
- The potential impact on professional indemnity insurance, particularly given that SDLT errors can surface years after completion
What can firms be doing now to prepare for the new SDLT rules?
Although implementation is not until May, firms should begin preparing for the changes now.
This includes:
- Reviewing internal SDLT processes and knowing who is responsible for submissions
- Assessing AML supervision and governance arrangements
- Considering whether complex SDLT matters should be referred to specialist tax advisers
How can we support you with your new SDLT responsibilities?
SDLT is moving further into the financial sector and collaboration between legal and tax professionals will be more important than ever.
We want to help clarify what this new tax adviser role means to you and assess your registration obligations, review AML compliance and support the digital registration process.
Our specialist tax advisers can provide professional advice on complex SDLT issues, such as relief claims or mixed-use transactions, reducing risk and strengthening audit trails.
We can help you manage HMRC enquiries, mitigate professional indemnity risks and review internal systems to ensure they align with the new regulatory standards.
Early planning can help your firm remain compliant with the new rules and continue to support your clients confidently.
For further advice or support, contact our legal accountants today.