Understanding SDLT Higher Rates: Condition B for Additional Dwellings Explained

When a dwelling is treated as subject to a lease for higher SDLT rates

For the higher SDLT rates on additional dwellings to apply, Condition B must be met. This depends on the exact property interest being bought, not just the fact that the asset relates to a dwelling. If the interest acquired is subject to a lease with more than 21 years left to run on the effective date, the higher rates do not apply.

• Condition B is met only if the interest bought is not subject to a lease, or is subject only to a lease with 21 years or less left to run.
• Buying a freehold reversion or a superior lease over a long lease will usually fail Condition B, so the higher SDLT rates will not apply.
• Buying the occupier’s own leasehold interest will often meet Condition B if that leasehold interest is not itself subject to another lease.
• The test must be applied to the specific interest acquired, such as the freehold, head lease or underlease, and different interests in the same dwelling can produce different SDLT results.
• The position is tested on the effective date of the transaction, which may differ from completion if there has been substantial performance.

Scroll down for the full analysis.

When a dwelling is “subject to a lease” for the higher SDLT rates

This page explains one of the gateway conditions for the higher rates of SDLT on additional dwellings. The point is easy to miss: even if you are buying an interest in a dwelling, the higher rates do not apply unless the interest you are buying is sufficiently “close” to the property. If the interest is burdened by a lease with more than 21 years left to run, Condition B is not met.

What this rule is about

The higher rates for additional dwellings in Schedule 4ZA to the Finance Act 2003 only apply if a series of conditions is met. One of those conditions is called Condition B.

Condition B looks at the interest being bought on the effective date of the transaction. It asks whether that interest is:

• not subject to a lease at all, or
• subject only to a lease that has no more than 21 years left before expiry at the date of the transaction.

This matters because some transactions involve buying a freehold or a superior leasehold interest while someone else holds a long lease underneath. In that situation, the buyer may be acquiring a reversionary interest rather than an interest that gives practical control or occupation of the dwelling. Condition B is designed to exclude those cases from the higher rates where the property is still tied up under a long lease.

What the official source says

HMRC’s manual says that Condition B is met only if, on the effective date, the interest in the dwelling being purchased is either:

• not subject to a lease, or
• subject to a lease with no more than 21 years left to run.

If a freehold or leasehold interest is bought and that interest is subject to a lease with more than 21 years remaining, the transaction is not a higher rates transaction.

The manual illustrates this with two examples:

• If a freehold is subject to a lease with 80 years left, buying the freehold does not meet Condition B. But buying the leasehold interest itself does meet Condition B, because that leasehold interest is not itself subject to another lease.
• If a freehold is subject to a 999-year head lease, and that head lease is subject to an underlease with 50 years left, buying either the freehold or the head lease does not meet Condition B because each is subject to a lease with more than 21 years to run. Buying the underlease does meet Condition B.

What this means in practice

The key question is not simply “am I buying a dwelling?” It is “what interest in the dwelling am I buying, and is that interest subject to a lease with more than 21 years left?”

In practice:

• Buying a freehold reversion over a long lease usually fails Condition B.
• Buying a superior lease that still has a long underlease beneath it usually fails Condition B.
• Buying the leasehold interest that is actually held by the occupier will often meet Condition B, provided that leasehold interest is not itself subject to another lease.

This can have a significant SDLT effect. Even if the buyer already owns other dwellings, the higher rates do not apply unless the statutory conditions are met. Condition B can therefore take some reversionary or superior interests outside the higher rates.

How to analyse it

A sensible way to analyse the point is:

• Identify exactly what interest is being acquired: freehold, head lease, underlease, or another leasehold interest.
• Ask whether that acquired interest is itself subject to a lease.
• If it is, work out how long that lease has left to run at the date of the transaction.
• If more than 21 years remain, Condition B is not met.
• If 21 years or less remain, Condition B may be met.
• Check the position on the effective date, because that is the date the legislation uses.

The focus is on the interest being bought, not just on the building in the abstract. Different interests in the same dwelling can produce different results.

Example

Illustration: A flat is held on a lease with 90 years left. The landlord sells the freehold to an investor who already owns several other residential properties.

Although the asset relates to a dwelling, the freehold being bought is subject to a lease with more than 21 years left. On HMRC’s approach, Condition B is not met. That means the transaction is not within the higher rates as a higher rates transaction.

By contrast, if the tenant assigned the 90-year lease to that investor, the leasehold interest acquired would not, on these facts, itself be subject to another lease. Condition B would be met, so the higher rates rules could then be in point if the other conditions were also satisfied.

Why this can be difficult in practice

The difficulty is often conceptual rather than mathematical. Property transactions can involve several layers of title, and it is easy to look only at the dwelling and miss the legal estate actually being transferred.

Points that may need careful checking include:

• whether the acquired interest is burdened by another lease at all;
• which lease in the title structure matters for this test;
• how many years were unexpired at the transaction date; and
• whether the effective date differs from completion, for example because of substantial performance.

The HMRC manual gives the department’s interpretation of the legislation, but the legal test comes from paragraph 3(3) of Schedule 4ZA to the Finance Act 2003. In most straightforward cases the result will be clear, but layered lease structures can make the analysis less obvious.

Key takeaways

• Condition B looks at the interest being acquired, not just at the dwelling itself.
• If that interest is subject to a lease with more than 21 years left, the higher rates do not apply.
• Different interests in the same property can be treated differently: a freehold reversion may fail Condition B even where the leasehold interest would satisfy it.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Understanding SDLT Higher Rates: Condition B for Additional Dwellings Explained

View all HMRC SDLT Guidance Pages Here