Guidance on SDLT Higher Rates for Purchasing Multiple Dwellings in One Transaction

SDLT higher rates for buying two or more dwellings in one transaction

When an individual buys two or more dwellings in a single transaction, the SDLT higher rates for additional dwellings can apply to the whole purchase, not just the extra dwelling. This happens only if at least two dwellings each meet three legal conditions: at least £40,000 of the price is fairly attributable to each, the interest bought is not subject to a long lease with more than 21 years left, and the dwelling is not treated as subsidiary to another dwelling in the same purchase.

• The transaction is tested as a whole, so it is either entirely within the higher rates or not within them under this rule.
• At least two dwellings must each pass all three conditions in paragraph 5 of Schedule 4ZA Finance Act 2003.
• A dwelling is subsidiary if it is in the same building or grounds as another purchased dwelling and that other dwelling accounts for at least two-thirds of the total price.
• The price must be split between the dwellings on a just and reasonable basis, based on the real facts rather than an artificial allocation.
• Annexes, cottages, coach houses and basement flats often raise the main difficulty, especially where one main dwelling dominates the value.
• Even if this specific rule does not apply, other higher-rate tests or related special rules may still need to be considered.

Scroll down for the full analysis.

When buying two or more dwellings in one transaction, when do the SDLT higher rates apply?

This page explains a specific SDLT rule for an individual who buys two or more dwellings in a single transaction. The main point is that the higher rates for additional dwellings are tested across the transaction as a whole, but only if the statutory conditions are met for at least two of the dwellings. The rule can matter where a purchase includes a main house and another self-contained dwelling, such as an annexe, coach house or basement flat.

What this rule is about

Schedule 4ZA to Finance Act 2003 contains the higher rates of SDLT for additional dwellings. Paragraph 5 deals with a particular problem: how to apply those higher rates where one transaction includes more than one dwelling.

The rule is aimed at purchases by an individual where several dwellings are acquired together. In that situation, the law does not split the transaction into part higher-rate and part normal-rate. Instead, the transaction either falls within the higher rates or it does not.

This matters because a buyer may assume that only the “extra” dwelling is taxed at the higher rates. That is not how this rule works. If the statutory test is met, the whole residential transaction is treated as a higher rates transaction.

What the official source says

HMRC says there are two different tests for a purchase of two or more dwellings in the same transaction. This page deals with the first test in paragraph 5 of Schedule 4ZA.

Under that test, the higher rates apply if at least two of the dwellings acquired meet all three conditions below:

• Condition A: the chargeable consideration attributable to that dwelling, on a just and reasonable basis, is at least £40,000.
• Condition B: the major interest acquired in that dwelling is not subject to a lease with more than 21 years left to run at the date of purchase.
• Condition C: the dwelling is not subsidiary to another purchased dwelling.

The source explains that a dwelling is subsidiary to another purchased dwelling if both of these points are true:

• it is in the same building or grounds as the other dwelling, and
• the consideration attributable to that other dwelling, on a just and reasonable basis, is at least two-thirds of the total consideration for the purchase.

If at least two dwellings satisfy Conditions A, B and C, the whole transaction is a higher rates transaction.

The source also notes a related point. Where one dwelling is worth at least two-thirds of the total transaction value, special rules may apply. That is a separate rule and needs to be considered alongside this one.

What this means in practice

The practical question is not simply whether the property contains more than one dwelling. It is whether at least two of those dwellings count for paragraph 5.

In practice, that means looking at each dwelling and asking:

• Is at least £40,000 of the price fairly attributable to it?
• Is the interest acquired free of a long lease with more than 21 years left?
• Is it a stand-alone dwelling for this rule, or is it merely subsidiary to another dwelling in the same building or grounds?

If only one dwelling passes all three conditions, paragraph 5 does not make the transaction a higher rates transaction.

If two or more dwellings pass all three conditions, the higher rates apply to the entire residential transaction, not just to the second dwelling.

The “subsidiary dwelling” point is often the deciding issue. A smaller annexe or basement flat may still be a separate dwelling in ordinary property terms, but for this rule it may be ignored if it is in the same building or grounds and the other dwelling accounts for at least two-thirds of the total price.

How to analyse it

A sensible way to work through the rule is:

1. Identify whether the transaction includes two or more dwellings.
2. For each dwelling, apportion the total consideration on a just and reasonable basis.
3. Check whether at least £40,000 is attributable to that dwelling.
4. Check whether the major interest acquired is subject to a lease with more than 21 years unexpired.
5. Check whether the dwelling is subsidiary to another purchased dwelling.
6. Count how many dwellings satisfy all three conditions.
7. If the answer is two or more, treat the whole transaction as a higher rates transaction under paragraph 5.

The phrase “just and reasonable basis” is important. The legislation does not say that the contract must allocate the price in a particular way. The real issue is whether the attribution of value to each dwelling is fair and supportable on the facts.

You should also ask whether one dwelling represents at least two-thirds of the total transaction value, because that can affect whether another dwelling is treated as subsidiary and may also engage the related special rule mentioned by HMRC.

Example

Illustration: an individual buys a house and a separate self-contained cottage in the grounds for £1 million. On a just and reasonable apportionment, £650,000 is attributable to the house and £350,000 to the cottage.

Both dwellings are above £40,000. Assume the buyer acquires major interests that are not subject to long leases with more than 21 years to run. The cottage is in the grounds of the house, so the subsidiary test must be checked. The house is worth £650,000, which is less than two-thirds of £1 million. That means the cottage is not subsidiary to the house on this test. If the same is true the other way round, both dwellings meet Conditions A to C. The result is that the whole transaction is a higher rates transaction.

By contrast, if the cottage were attributed only £250,000 and the house £750,000, the house would represent at least two-thirds of the total price. In that case, the cottage could be treated as subsidiary to the house if it is in the same building or grounds. Then Condition C would fail for the cottage, and paragraph 5 would not apply on the basis that two dwellings satisfy all three conditions.

Why this can be difficult in practice

The source material is short, but applying it can be fact-sensitive.

First, value attribution can be disputed. The test uses a “just and reasonable” apportionment, so the figures must reflect the real economics of the property rather than an artificial split.

Second, whether something is in the same building or grounds may be straightforward in some cases and less so in others, especially where land is extensive or the layout is unusual.

Third, the rule assumes that there are multiple dwellings in the first place. That can itself be contentious where a property has an annexe, converted outbuilding or accommodation with some but not all features of independent occupation.

Fourth, HMRC notes that there are two tests for purchases of multiple dwellings, and this page covers only one of them. So even if paragraph 5 does not apply, that does not automatically end the higher-rates analysis.

Finally, the source also flags a separate special rule where one dwelling is worth at least two-thirds of the total consideration. That means cases involving a dominant main dwelling and a smaller secondary unit need particular care.

Key takeaways

• A single transaction involving multiple dwellings is either wholly within the higher rates or wholly outside them for this purpose; it is not split between rates.
• Paragraph 5 applies only if at least two dwellings each satisfy the £40,000 test, the lease test and the non-subsidiary test.
• The subsidiary dwelling rule and the just-and-reasonable apportionment of price are often the key practical issues.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Guidance on SDLT Higher Rates for Purchasing Multiple Dwellings in One Transaction

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