Congratulations on your unpaid promotion to tax adviser.

Let’s be brutally honest for a second. For over a decade, conveyancers and mortgage brokers have operated on a beautifully ironic gentleman’s agreement with HMRC: you do their complex tax maths for absolutely zero fee, and in return, you absorb 100% of the legal liability when it inevitably goes wrong.

As business models go, it’s absolute madness. But it’s a fantastic deal for the government.

Until now, the industry’s primary risk management strategy has been based largely on hope. You run a client’s numbers through a generic online calculator, let a fee-earner physically key the data into the HMRC portal, and bury a "We do not give tax advice" disclaimer on page 14 of your client care letter. Then you cross your fingers and pray it holds up in a negligence tribunal if things go south.

Spoiler alert: the gig is officially up.

Under the impending Finance Bill 2025-26, the regulatory landscape is shifting permanently. By May 2026, the physical act of submitting an SDLT return legally registers you as a tax adviser. That flimsy disclaimer you’ve been relying on? It will be entirely void.

The £16,360 problem.

I hate waffle, so let’s look at the actual data. The stakes here are no longer hypothetical. At Stamp, our platform analytics prove that 53% of all residential property transactions contain hidden tax complexities—annexes, trust structures, mixed-use elements, and accidental 5% surcharges.

When a basic generic calculator misses one of these complexities, it’s a direct hit to your Professional Indemnity insurance. Based on our forensic analysis of non-standard calculations, the average liability value of a missed complexity is £16,360.

That is the un-invoiced liability sitting on your balance sheet right now. You are taking on six-figure aggregated risk, for zero reward.

Putting a plaster on a bullet wound.

The industry's default reaction to this growing PI threat has been to try and build slightly better calculators. But a slicker UI doesn't solve a structural legal problem. If your staff are still manually interpreting client data and your firm is still the entity clicking "submit", you still legally own the advice liability.

I have zero interest in building generic tech or vanity software. We didn’t build Stamp.Expert to be just another calculator. We built it to be a structural escape route.

How Stamp rewires the process.

Stamp engineers a complete transfer of risk away from your desk through three core pillars:

1. Client-Led Input: We take your fee-earners completely out of the firing line. You trigger a secure, smart 3-minute fact-find to the client's phone. They provide the data, meaning they own the input.

2. The Forensic Filter: Our engine instantly processes the data against 40+ statutory reliefs. Standard cases are cleared immediately, generating a defensible, time-stamped PDF audit trail that perfectly satisfies CQS CPMS 1.2a and FCA Consumer Duty.

3. Complete Liability Transfer: When the system flags one of the 53% of cases that are non-standard, the client is seamlessly directed to our independent panel of tax specialists. Every specialist carries a minimum of £1m+ in Professional Indemnity insurance. They take over the complex calculation, and crucially, they take the legal liability off your hands.

Protecting the Broker’s pipeline.

For Mortgage Brokers, this absurdity hits differently. You aren't just battling the FCA’s Consumer Duty; you're battling the 11th-hour affordability shock.

There is nothing quite like the irony of securing a fantastic mortgage for a client, only for a conveyancer to discover a 5% surcharge eight weeks into the transaction. The client's available funds are decimated, the required LTV is instantly breached, and the deal collapses. Stamp provides certified tax clarity on Day 1, ensuring the pipeline remains secure and your commission is protected.

The escape route is live.

The era of hoping a generic calculator gets it right is over. Stamp is officially live.

We are actively onboarding forward-thinking law firms and mortgage brokerages who want to ring-fence their PI insurance, automate their compliance, and officially resign from their unpaid roles as tax collectors.

The calculation has changed. If your risk management hasn't, it's time we talked. Transfer your liability today.

Thank you for reading,

Stu Wood - Founder & CEO

A "Call to Action" for the industry.

"We aren't just sitting around waiting for HMRC to start handing out fines," adds Stu Wood. "A new version of Stamp is already in development to provide even greater protection and clarity for professionals. I encourage everyone to stay informed by keeping an eye on developments at both stamp.expert and stampcheck.co.uk for the latest tools and guidance. The rules have changed; make sure your tech has too."

About Stamp: Stamp is the UK's leading SDLT risk management and compliance platform. Launched in 2019, it was built specifically for property and finance professionals. It replaces basic calculators with an intelligent diagnostic system that identifies risk, creates a defensible audit trail, and provides a compliant pathway to specialist advice—permanently closing the dangerous "advice gap."