Can an SDLT refund or corrective submission be sent to HMRC before the client signs the authority and terms?

Introduction

People often want to know whether a Stamp Duty Land Tax claim, refund request or corrective account can be sent to HMRC straight away, especially where the technical work is already underway. A common practical issue is that the client may have signed electronically, but the adviser is still waiting for a handwritten signature on the authority to act or on the terms of business.

This is mainly an engagement and process question rather than a point of substantive SDLT law. In practice, the key issue is whether the adviser has the authority and documents needed to act for the taxpayer and to submit material to HMRC in a form the adviser is prepared to rely on.

The Question

A taxpayer asked whether an SDLT corrective account submission could now be sent to HMRC after completing most of the onboarding steps. The taxpayer had signed documents online, but there had been some delay in providing a printed and handwritten signed copy of the authority and final signed terms because access to printing and scanning facilities was limited. The taxpayer wanted to know whether the submission was otherwise ready and whether it could proceed immediately.

Nick’s Explanation

Nick’s explanation was practical rather than technical. In anonymised form, his position was that work on the case had already started, research had been carried out, and a draft submission letter was being prepared. However, he explained that the matter would be finalised once he was back at work and that there was no immediate HMRC deadline causing prejudice to the taxpayer.

His key point was essentially this: the case preparation could continue, but the formal submission timetable depended on the file being in order. He also reassured the taxpayer that they were still within time, so a short delay in finalising the authority documents would not in itself cause a problem.

A fair summary of the reasoning is:

• the substantive review can begin before final submission;
• the adviser will usually want the signed authority and signed terms in place before sending the submission to HMRC;
• if there is no imminent filing deadline, a short administrative delay is usually manageable.

The Law

There is no single general rule in the Finance Act 2003 saying that every SDLT amendment, refund request or corrective submission is invalid unless a handwritten authority is held by the adviser. The legal position depends on what is being filed, how it is being filed, and whether the person making the submission is doing so as the taxpayer or as an agent.

In broad terms:

• SDLT is governed by Finance Act 2003.
• Returns, amendments and claims are subject to statutory time limits.
• HMRC may deal with an authorised agent, but the agent must have proper authority to act.
• Separately from tax law, an adviser will usually require signed terms of business and a signed authority as part of their own compliance and risk management procedures.

So there are really two layers:

1. the statutory SDLT rules about whether a claim or amendment is in time and correctly made; and
2. the adviser’s professional and administrative requirement to hold satisfactory authority before corresponding with HMRC on the client’s behalf.

Analysis

Step one is to separate the underlying tax issue from the paperwork issue. If the taxpayer may have overpaid SDLT, the legal merits of the reclaim do not depend on whether a printer was available on a particular day. The tax analysis stands or falls on the legislation, facts and evidence.

Step two is to consider authority. If an adviser is writing to HMRC as agent, the adviser will normally want clear written authority to act. An electronically signed document may sometimes be enough in principle, but many firms still require a wet-ink signature or a clear scanned copy for internal compliance reasons, especially where they are submitting a corrective account or refund claim and want a complete evidential file.

Step three is to consider the terms of business. Even if HMRC would accept correspondence from an agent, the adviser may not be willing to proceed until the contractual engagement documents are properly signed. That is a matter of retainer, risk and professional process.

Step four is timing. If there is no imminent statutory deadline, then the practical answer is usually that the adviser can continue preparing the case but may wait to submit it until the signed documents are fully in place. That appears to have been the position here.

Step five is whether any delay creates a legal problem. If the matter remains within the relevant SDLT time limit, a short delay caused by obtaining signatures is usually inconvenient rather than fatal. The important thing is to identify the deadline correctly and avoid drifting past it.

Where the underlying SDLT issue involves whether a property was uninhabitable or not suitable for use as a dwelling, readers should be aware that the threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. That case does not concern signature formalities, but it is highly relevant to the merits of many refund claims. A submission should not be rushed merely because the paperwork is nearly complete; the legal basis of the claim must still be strong.

Outcome

The practical conclusion is that an adviser may prepare the SDLT submission before all signature formalities are complete, but will often choose not to send it to HMRC until the signed authority and signed terms of business are in place. If there is no immediate HMRC deadline, that is usually a sensible approach.

So the answer is: the case can often be worked on in advance, but the actual submission may properly be held back until the engagement documents are fully signed and returned.

Practical Steps

If you are in this position, the sensible next steps are:

1. ask your adviser exactly which documents are still outstanding;
2. confirm whether they require only an electronic signature or a handwritten signed copy as well;
3. check the statutory deadline for the SDLT amendment, reclaim or corrective submission;
4. make sure the adviser has all factual evidence needed for the substantive argument, not just the authority paperwork;
5. if the claim relates to habitability or suitability for use, review the facts carefully in light of Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, because the threshold is now demanding;
6. once the authority and terms are complete, ask for confirmation of when the submission will actually be sent to HMRC.

Conclusion

A delay in signing the authority or terms does not usually decide the SDLT issue itself, but it can delay the adviser from sending the submission to HMRC. If the matter is still within time, the normal course is to complete the paperwork, finalise the submission and then send it once the file is fully in order.

Legal References Used

• Finance Act 2003
• Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799

This page was last updated on 22 March 2026.

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