Understanding SDLT: Leases for Indefinite Term and Tax Implications Explained

When a lease is treated as indefinite for SDLT

For Stamp Duty Land Tax, the key issue is whether the lease term can be worked out when the lease is granted from the lease and any relevant supporting documents. If the end date cannot be identified at the start, HMRC treats the lease as being for an indefinite term, even if it may be valid as a tenancy under general property law.

• A lease is treated as indefinite if its term cannot be ascertained at the date of grant from the lease itself or related documents such as an agreement for lease.
• Periodic tenancies, whether expressly stated as weekly or monthly or implied from rent periods, are the main example because they continue until notice is given.
• A fixed-term lease is not indefinite just because it includes a break clause or another right to end early on notice.
• A lease for life is treated as indefinite for SDLT because the actual end date depends on a person’s lifespan and cannot be known at the outset.
• In practice, the main test is whether the maximum term is clear when the lease is granted, not whether the lease might end sooner.

Scroll down for the full analysis.

When a lease is treated as having an indefinite term for SDLT

This page explains when a lease is treated as being for an indefinite term for Stamp Duty Land Tax purposes. This matters because SDLT does not simply follow the everyday label used for a tenancy or lease. The key question is whether the lease term can be worked out at the date the lease is granted.

What this rule is about

SDLT needs a lease term in order to work out how the transaction should be taxed. In many cases that is easy. A lease might say it runs for five years from a stated date, so the term is fixed and known from the outset.

The difficulty arises where the lease does not contain an end date that can be identified when the lease is granted. If the lease could continue until someone gives notice, or until some legal event happens, the term may not be ascertainable at the start. HMRC treats that as a lease for an indefinite term.

This is a classification point. It is about how the lease is characterised for SDLT, not about whether the arrangement is valid as a matter of landlord and tenant law.

What the official source says

HMRC says a lease is for an indefinite term if its term cannot be solely ascertained from the lease wording, or from another relevant document available at the date of grant, such as an agreement for lease or a certificate of practical completion.

In other words, you ask whether the length of the lease can be determined when it is granted by looking at the lease and any ancillary documents that fix the term. If it cannot, HMRC treats it as indefinite.

The manual gives the example of a lease whose end depends on notice being given or on the operation of law. The most common example is a periodic tenancy.

HMRC also explains that periodic tenancies may be:

• explicit, where the tenancy agreement states the period, such as weekly or monthly, or
• implicit, where the period is inferred from how often rent is payable.

Because a periodic tenancy continues from period to period unless notice is given, its end date cannot be known at the date of grant. HMRC therefore treats it as a lease for an indefinite term for SDLT purposes.

The manual also makes an important contrasting point. A lease is not indefinite just because it contains a break right or some other right to terminate on notice. If the overall term can be ascertained when the lease is granted, it remains a fixed-term lease for SDLT, and the right of termination is disregarded for this purpose.

HMRC also says that a lease for life is treated as a lease for an indefinite term for SDLT because the actual end date depends on the duration of a person’s life and cannot be known at the grant date. This is so even though, in England, a lease for life may be treated as a 90-year term for other legal purposes.

What this means in practice

The practical issue is not whether the lease might end early. The issue is whether the lease has a term that can be identified at the outset.

If the lease says, in substance, “this tenancy continues until notice is given”, that points strongly to an indefinite term. There is no fixed end date to identify at grant.

If the lease says, for example, “this lease is for 10 years, but either party may break on six months’ notice after year 5”, that is different. The term is still 10 years for SDLT classification purposes, because the maximum term is ascertainable when the lease is granted. The existence of a break right does not by itself turn it into an indefinite lease.

This distinction matters because SDLT has separate treatment rules for leases for an indefinite term. HMRC’s page points readers to separate guidance on that tax treatment.

How to analyse it

A sensible way to analyse the point is to ask the following questions.

• What documents exist at the date of grant that define the lease term? Start with the lease itself, but also consider any agreement for lease or other ancillary document that fixes the commencement or end of the term.
• Can the end date be worked out from those documents alone? If yes, the lease is likely to be fixed term for SDLT.
• Does the lease continue until notice is served? If so, that points towards an indefinite term.
• Is it a periodic tenancy? If it rolls from week to week, month to month, or other rental period unless notice is given, HMRC treats that as indefinite.
• Is there merely a right to terminate a fixed term lease early? If the fixed term itself is identifiable at grant, the lease is not indefinite just because of that right.
• Is it a lease for life? For SDLT, HMRC treats that as indefinite because the true end date cannot be known at the start.

The key legal idea is ascertainability at the date of grant. That is the point to test.

Example

Illustration 1: A tenancy agreement says the tenant may occupy from 1 May and the tenancy continues monthly until either party gives one month’s notice. The tenancy is monthly, but there is no fixed end date at grant. On HMRC’s approach, this is a lease for an indefinite term.

Illustration 2: A lease says it runs for 15 years from completion, with a tenant’s option to break on not less than six months’ notice after the fifth anniversary. The lease may end earlier in practice, but its term is still ascertainable at grant. For SDLT classification, it is a fixed-term lease, not a lease for an indefinite term.

Illustration 3: A lease is granted for the life of a named occupier. The lease will end on that person’s death, but that date is unknown when the lease is granted. HMRC treats it as a lease for an indefinite term for SDLT.

Why this can be difficult in practice

The difficulty is often not the legal principle but the documents. Some arrangements are poorly drafted, or the key term is spread across several documents. A lease may appear open-ended on its face, but an agreement for lease or another ancillary document may make the term ascertainable. Equally, a document may look like a fixed arrangement in commercial terms while still failing to state an end date clearly enough for SDLT analysis.

Another source of confusion is the difference between landlord and tenant law and SDLT treatment. A lease for life, for example, may be treated in a particular way for other legal purposes, but HMRC’s point here is that SDLT looks at whether the actual end date can be known at grant. If it cannot, HMRC treats it as indefinite.

A further common misunderstanding is to assume that any notice provision makes a lease indefinite. That is not what HMRC says. The notice provision matters only if it means the term itself cannot be ascertained at the start. If the lease already has a fixed term and the notice only allows early termination, the lease remains fixed term for SDLT classification.

Key takeaways

• For SDLT, a lease is for an indefinite term if its term cannot be worked out at the date of grant from the lease and any relevant ancillary documents.
• Periodic tenancies are the usual example because they continue until notice is given, so the end date is not known at the start.
• A fixed-term lease does not become indefinite just because it contains a break clause or other right to terminate early.

This page was last updated on 24 March 2026

Useful article? You may find it helpful to read the original guidance here: Understanding SDLT: Leases for Indefinite Term and Tax Implications Explained

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