Is an Undervalued Property Sale to Reduce Stamp Duty Tax Evasion, and Could a Later Buyer Be Liable?

Introduction

People often search for this issue after seeing messages, emails or documents suggesting that an earlier property sale was deliberately recorded at a lower price to reduce Stamp Duty Land Tax (SDLT). The usual concern is whether that amounts to tax evasion and whether someone who later bought the same property, or is now involved in a dispute about it, could be personally at risk.

The answer depends on what actually happened in the earlier transaction. A genuine sale at a low price between individuals is not automatically unlawful for SDLT purposes. The real problem arises if the price declared to HMRC was not the true consideration, or if part of the price was concealed.

The Question

A homeowner is defending a claim under the Trusts of Land and Appointment of Trustees Act 1996 brought by a former partner. During settlement discussions, the former partner says that, in an earlier sale of the same property to a family member, the property was deliberately undervalued so that the transaction fell below the SDLT threshold. The former partner also says that the higher value appeared on a mortgage application.

The homeowner later bought the property in their sole name in a separate transaction some years afterwards. The question is whether the earlier arrangement could amount to tax evasion and whether the later buyer could be liable in any way.

Nick’s Explanation

Nick’s core point is that SDLT is usually charged by reference to the actual chargeable consideration given for the land transaction. In a straightforward sale between individuals, HMRC does not automatically substitute market value just because the property may have been worth more.

In anonymised form, his explanation can be summarised like this:

“For SDLT purposes, HMRC generally looks at what was actually paid. A property can be sold for less than its market value without that, by itself, creating an SDLT problem. The issue is whether the figure reported to HMRC truly reflected the real bargain.”

He also identified the key risk area:

“If the declared price did not match the money or money’s worth actually given, or if there was a side arrangement that was not disclosed, that could amount to deliberate misrepresentation.”

On personal liability, Nick’s reasoning was that a later buyer would not usually become liable for an earlier seller’s SDLT position merely because they later bought the same property. The important questions are whether the later buyer had any involvement in the earlier transaction, knew about any false statement at the time, signed documents connected with it, or participated in concealing the true consideration.

The Law

SDLT is charged under the Finance Act 2003 on land transactions. The starting point is that tax is calculated by reference to the “chargeable consideration” for the transaction. In ordinary language, that usually means what the buyer actually gives for the property, whether in money or something else of value.

For most arm’s length transactions between individuals, there is no general rule that SDLT must be calculated on open market value instead of the actual price paid. A sale at an undervalue is therefore not automatically an SDLT avoidance arrangement.

However, market value rules can apply in some situations, especially where the legislation specifically requires them, including certain transactions involving connected companies or other statutory cases. Separate anti-avoidance rules can also apply where arrangements are artificial or where the reported consideration is not the whole of what was really given.

If a person knowingly submits an SDLT return that understates the true consideration, that may expose them to tax assessments, penalties and, in serious cases, allegations of fraud or cheating the public revenue. The legal issue is not simply that the property was “worth more”, but whether HMRC was given a false figure for the actual transaction.

Capital Gains Tax (CGT) is a different issue. For CGT, market value rules can apply to transactions between connected persons. A sale to a child may therefore raise a market value question for CGT even where SDLT was based on the actual consideration. Whether any gain was taxable would then depend on the facts, including whether any relief such as private residence relief was available.

Analysis

There are three separate questions here.

First, was the earlier sale itself improper for SDLT purposes? If the earlier owner genuinely sold the property to a family member for a lower price, and that lower price was the whole bargain, SDLT would normally be based on that lower amount. In that situation, saying the property was “undervalued” does not by itself prove tax evasion.

Secondly, was the SDLT return false? This is where the wording matters. If the real agreement was that the buyer would pay more than the amount shown in the transfer or SDLT return, or provide some other undisclosed benefit, and only the lower figure was reported to HMRC, that is much more serious. A “paper exercise” designed to bring the price below the SDLT threshold suggests the possibility that the documents may not have reflected the true consideration. If so, the concern is not undervaluation as such, but misdeclaration.

Thirdly, could the later buyer be liable? Usually, no, unless they were involved in the earlier arrangement. A person who bought the property later in a separate transaction is generally responsible only for the tax position on their own purchase. They do not normally inherit liability for someone else’s earlier SDLT underpayment simply because they now own the property or are in litigation about it.

The practical liability question therefore turns on involvement and knowledge. Relevant points include:

• whether the later buyer was a party to, witness to, or signatory on any earlier sale documents;
• whether they knew at the time that the declared consideration was false;
• whether they helped prepare, support or submit any false information;
• whether there is evidence of undisclosed payments, side agreements or mortgage documentation inconsistent with the reported price.

If the later buyer was not involved and only learned of the allegation afterwards, HMRC would usually focus on the parties to the earlier transaction rather than the later purchaser.

The mention of a higher value on a mortgage application is not, by itself, conclusive. Mortgage valuations and lending figures do not necessarily establish the chargeable consideration for SDLT. They may, however, become relevant evidence if they suggest that the parties privately treated the transaction as being worth more than the amount reported.

There may also be a separate CGT issue for the earlier seller if the buyer was a connected person. A transfer to a child can trigger market value treatment for CGT purposes. That does not automatically create SDLT liability for the later buyer, but it may matter to the earlier seller’s tax position.

Outcome

A deliberately false SDLT figure can amount to tax evasion or tax fraud. But a genuine sale at less than market value between individuals is not automatically unlawful for SDLT.

A later buyer who purchased the property in their own separate transaction is unlikely to be liable for any SDLT problem arising from the earlier sale unless they were knowingly involved in the misstatement or concealment.

So the practical conclusion is:

• if the earlier sale price reported to HMRC was the true price actually agreed and paid, there may be no SDLT issue merely because the property was worth more;
• if the reported price was false and part of the consideration was concealed, that is potentially serious for the parties involved in that earlier transaction;
• the later buyer is not usually liable unless they participated in or knew of the false arrangement at the time.

Practical Steps

Anyone assessing their position should work through the facts carefully.

• Obtain the transfer deed, SDLT return information, completion statement and any contemporaneous correspondence for the earlier sale if available.
• Check whether the amount declared to HMRC matches the amount actually paid or otherwise given for the property.
• Look for evidence of side payments, informal agreements, gifted deposits, debt releases or other benefits that may have formed part of the true consideration.
• Compare the mortgage application and lender documents with the sale paperwork, but remember that a higher valuation alone does not prove SDLT fraud.
• Identify whether the later buyer signed, witnessed or took part in any documents or discussions connected with the earlier sale.
• Consider separately whether the earlier sale may have raised a CGT issue because it was between connected persons.
• If the issue is relevant to ongoing TOLATA proceedings, keep the tax question distinct from the beneficial ownership dispute. They may overlap factually, but they are different legal issues.

Conclusion

An undervalued sale is not automatically tax evasion for SDLT. The key question is whether HMRC was told the true consideration. If the earlier transaction involved a false figure or concealed payment, the parties to that transaction may face tax consequences. A later buyer who was not involved will usually not be personally liable for that earlier SDLT position.

Legal References Used

• Finance Act 2003, especially the SDLT provisions on chargeable consideration
• Trusts of Land and Appointment of Trustees Act 1996
• Capital gains connected persons rules under the Taxation of Chargeable Gains Act 1992

This page was last updated on 22 March 2026.

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