What’s Changing in May 2026?
From 18 May 2026, the UK is introducing a major regulatory shift that will affect every property transaction involving Stamp Duty (SDLT).
Under new rules brought in through the Finance Bill 2025–26:
Conveyancers submitting SDLT returns will now be classed as “tax advisers”
They must register with HMRC and meet minimum standards
This applies even if they don’t consider themselves tax specialists
This is a significant change because historically, filing Stamp Duty has been seen as a routine part of conveyancing, not regulated tax advice.
Why Has This Change Been Introduced?
HMRC’s aim is to:
- Raise standards in the tax advice market
- Improve accountability
- Reduce errors and fraudulent submissions
Anyone interacting with HMRC on behalf of clients (including submitting tax returns like SDLT) must now be formally registered
What Does This Mean for Conveyancers?
From May 2026:
✔️ They must register as a tax adviser with HMRC
✔️ They must meet defined compliance and AML standards
✔️ They must identify “relevant individuals” within their firm responsible for tax activities
Even simply filing a Stamp Duty return brings them into scope — whether or not they give advice
What Happens If a Conveyancer Doesn’t Comply?
This is where it becomes really important for clients
If a conveyancer:
❌ Fails to register
❌ Doesn’t meet HMRC standards
❌ Is removed or restricted
They may:
- Be blocked from submitting SDLT returns
- Receive formal notices to stop acting
- Face penalties or sanctions
And crucially…
They may not be able to complete your transaction properly
The Real Impact on You as a Client
This isn’t just a “behind the scenes” regulatory change — it can directly affect buyers and homeowners.
1. Delays in Your Purchase or Remortgage
If your conveyancer isn’t registered in time, they may not be able to file your Stamp Duty return.
No SDLT submission = delays in completion or registration of ownership
2. Risk of Errors or Non-Compliance
With SDLT now treated as a form of tax advice:
- Mistakes could carry greater regulatory consequences
- Complex cases (e.g. additional properties, mixed-use, companies) need even more care
3. Potential Financial Consequences
If something goes wrong:
- You could face penalties or interest from HMRC
- You may need to instruct a new adviser mid-transaction
- Worst case, transactions could fall through
4. Confusion Around “Tax Advice”
There’s also concern within the industry that:
- Conveyancers are being labelled as tax advisers
- But many are not trained tax specialists
This could create grey areas around responsibility and advice quality
Why This Matters More in Today’s Market
With:
- Increasing Stamp Duty complexity
- More investors and limited companies
- Tighter affordability and timelines
The margin for error is already small
This change adds another layer of compliance risk and dependency on your conveyancer
What Should You Do as a Buyer or Homeowner?
Here’s the key takeaway
Ask the right questions:
- Are you registered with HMRC as a tax adviser?
- Who handles SDLT submissions in your firm?
- How do you deal with complex Stamp Duty cases?
Work with experienced professionals
Not all conveyancers will adapt at the same speed.
Get your mortgage broker involved early
At Oak, we often help coordinate the full process, not just the mortgage — because one weak link can delay everything.
Final Thoughts
This change might sound technical, but the impact is very real:
It could affect how quickly you move
It could affect whether your transaction completes smoothly
And in some cases, it could affect your financial outcome
Need Help Navigating It All?
At Oak Mortgages, we don’t just arrange mortgages we help make sure your entire property journey runs smoothly. All the conveyancing partners we deal with are ensuring full adherance to the new regulation.
If you’re buying, remortgaging or investing:
Get in touch and we’ll make sure you’ve got the right team around you from day one
