As the legal sector marches toward May 2026, a new regulatory hurdle is appearing on the horizon: Mandatory HMRC Registration for Tax Advisers.
While this might sound like a simple administrative update for accountants, there is a hidden dependency that could catch law firms, specifically conveyancing practices, completely off guard.
HMRC has made it clear: if you submit Stamp Duty Land Tax (SDLT) returns or interact with them on behalf of a client for a fee, you are a tax adviser in their eyes. And your right to register depends on, amongst other things: your AML compliance.
The Second Registration Condition: Your AML Passport
Under the new rules introduced via the Finance Bill 2025-26, firms must meet specific Minimum Standards to stay in business. The most critical for law firms is the Second Registration Condition: proof of active Anti-Money Laundering supervision.
For SRA-regulated firms, the SRA currently acts as your supervisor for now. However, HMRC isn’t just looking for a logo on your letterhead; they require firms to confirm that their AML policies, procedures, and procedures are current and complete.
Why Conveyancing is the Primary Target
Many property lawyers argue, “We don’t give tax advice; we just fill in the SDLT forms.” HMRC has officially closed this loophole.
- The Definition: If you are paid to interact with HMRC (filing returns, claiming reliefs, or even calling them about a client’s account), you fall within the scope.
- The Risk: Property transactions are inherently high-risk for money laundering. By linking tax registration to AML, HMRC is ensuring that firms handling large capital flows are properly vetted.
The AML Audit & Sanction Trap
What if your firm is currently being audited by the SRA, or was sanctioned last year? While a past sanction doesn’t automatically disqualify you, it creates a high-stakes environment for your May 2026 application:
- The Accuracy Risk: When you register, you must declare that your AML policies are current. If you hit ‘submit’ while an SRA audit is uncovering systemic failures, for example, in your Firmwide Risk Assessment (FWRA), you are effectively providing false information to HMRC—a criminal offense.
- The Fit and Proper Test: HMRC will vet relevant individuals (partners and senior managers). If a partner was personally sanctioned for a relevant offense or dishonesty, HMRC may refuse to register them, potentially blocking the entire firm from filing SDLT returns.
How to Prepare Your Property Practice Now
Do not wait until the portal opens in May 2026. Use the remaining months to bridge the gap between your AML reality and HMRC’s expectations:
- Update the FWRA: Review your Firmwide Risk Assessment today. If it hasn’t been updated since the last twelve months, it isn’t current.
- Verify Relevant Individuals: Identify which partners will be named in the registration. If your firm has 5 or fewer officers, all will likely be vetted. Ensure their personal tax affairs are spotless.
- Audit Your CDD Records: HMRC may require evidence. Ensure your Client Due Diligence (CDD) and ongoing monitoring records are retrievable and complete.
- Update Engagement Letters: Explicitly state that the firm is registered with HMRC as a tax adviser for SDLT purposes to manage expectation creep and satisfy new transparency requirements.
The Bottom Line
In 2026, your AML policy is your passport to HMRC. Without a robust, up-to-date framework, you won’t just face the SRA, you’ll face a total block on your ability to file returns or complete conveyancing on purchase matters.
Expert Tip: If your firm is currently mid-audit, treat the SRA’s feedback as your roadmap for HMRC registration. Remediating issues now ensures that when you hit Submit in 2026, your declaration is bulletproof.