Lease Transactions & Stamp Duty

Types of Lease Transactions

Stamp duty on lease transactions can be complex because you may pay tax on both. Use our stamp duty calculator to estimate your liability:

• The premium (upfront lump sum payment), and
• The Net Present Value (NPV) of rent over the lease term

Assignment of Existing Lease

When you buy an existing leasehold property (for example, a flat), this is an assignment. You pay SDLT on the purchase price (consideration) using standard residential or additional property rates. See our leasehold stamp duty guide for comprehensive details.

Ground rent payable under the existing lease does not create additional SDLT on an assignment. Only the purchase price matters.

Grant of New Lease

When a landlord grants you a new lease, SDLT can apply to both:

Residential Lease Rates (NPV)

Commercial Lease Rates (NPV)

SDLT on New Leases

New lease grants involve two separate SDLT calculations that are added together: one on any premium (upfront payment) and one on the Net Present Value of rent payments over the lease term.

Premium Element

If you pay an upfront lump sum (premium) to acquire the lease, this is taxed using standard residential or commercial SDLT rates depending on the property type. For example, a £200,000 premium on a residential lease would incur £1,500 SDLT using standard residential rates.

Rent Element

The rent you'll pay over the lease term is converted to a Net Present Value (NPV) using a 3.5% annual discount rate. This NPV is then taxed separately. For residential leases, the first £125,000 of NPV is tax-free, with 1% charged on any NPV above that threshold.

When Tenants Pay SDLT

Most residential tenants on standard shorthold tenancies never pay SDLT because typical rents don't generate sufficient NPV to exceed the £125,000 threshold. However, SDLT can apply in specific circumstances.

High-Rent or Long-Term Leases

If annual rent is very high or the lease term is extremely long, the NPV can exceed £125,000, triggering SDLT on the excess. For example, a 99-year lease at £1,500 annual rent has an NPV of approximately £41,000 (below threshold), but at £5,000 annual rent, NPV reaches roughly £136,000, creating SDLT of £110 (1% of £11,000 excess).

Commercial Tenants

Commercial tenants more commonly face SDLT on rent because the threshold is slightly higher (£150,000 NPV) but commercial rents are typically much higher. A 10-year office lease at £50,000 annual rent has an NPV of approximately £415,000, resulting in SDLT of approximately £5,300.

Lease Extensions and Assignments

The SDLT treatment differs significantly depending on whether you're extending an existing lease or taking an assignment of someone else's lease.

Lease Extensions

Extending a lease counts as the grant of a new lease for SDLT purposes. You pay SDLT on any premium charged by the freeholder, plus SDLT on the NPV of any ongoing rent. Statutory lease extensions under the Leasehold Reform Act typically reduce rent to a peppercorn (zero), so only the premium is taxed.

Lease Assignments

When you buy (assign) an existing leasehold property from the current leaseholder, you pay SDLT only on the purchase price using standard rates. The ground rent under the existing lease is ignored for SDLT purposes. This is why most flat purchases only involve SDLT on the price, not the rent.

Commercial Lease SDLT

Commercial leases follow the same dual calculation structure but with different NPV thresholds and rates:

• NPV threshold: £150,000 (compared to £125,000 for residential)
• First tier rate: 0% up to £150,000 NPV
• Second tier rate: 1% on NPV between £150,001 and £5,000,000
• Third tier rate: 2% on NPV over £5,000,000

These rates apply only to the rent element. Any premium paid on a commercial lease uses the standard non-residential SDLT rates (0% to £150k, 2% from £150k-£250k, 5% over £250k).

Net Present Value (NPV) Calculation

NPV converts future rent payments into today's money using a standard discount rate of 3.5% per year. HMRC provides an official calculator, or your solicitor will compute it.

In practice, if ground rent is low (under a few hundred pounds per year), the NPV often falls below the £125,000 nil-rate threshold, resulting in zero SDLT on rent.

Ground Rent NPV: Formula, Peppercorn, and Worked Example

When a new lease is granted (typically a new-build leasehold flat or house, or a long lease of commercial premises), SDLT is calculated on two components: the premium paid (treated as standard consideration) and the Net Present Value (NPV) of all future rent payments under the lease. Understanding the ground rent NPV formula matters because it can push the rent SDLT bill above the £125,000 nil-rate threshold even when the premium is modest.

The 3.5% temporal discount rate

HMRC uses a 3.5% annual discount rate to convert the full future-rent stream into a single present-value figure. For each lease year t, the present value of that year's rent is:

For a constant (fixed) annual ground rent R over n years, this simplifies to the annuity formula:

Annuity factors at 3.5% (for common lease terms)

The annuity factor depends only on the lease term, not the rent amount. To get the NPV, multiply the annuity factor by the annual rent. A 99-year lease at £500 per year has NPV = 27.099 × £500 = £13,549.50 — well under the £125,000 nil-rate threshold, so no SDLT on rent.

Peppercorn ground rent and the 2022 Act

The Leasehold Reform (Ground Rent) Act 2022 came into force on 30 June 2022 for most new residential leases. It prohibits landlords from charging more than a peppercorn (effectively £0) as ground rent on new regulated leases. For SDLT purposes, the NPV of peppercorn ground rent is £0 × annuity factor = £0. This means that for all new residential leases granted from 30 June 2022 onwards, there is no NPV element to the SDLT calculation — SDLT applies only to any premium paid. This significantly simplifies the SDLT position for buyers of new-build leasehold flats or houses.

Worked Example: 10-Year Residential Lease at £15,000/year

This example shows how to calculate NPV and determine SDLT on a residential lease with significant annual rent.

Lease Extensions and Stamp Duty

Statutory Lease Extension

Under the Leasehold Reform Act, flat owners can extend their lease by 90 years. You pay SDLT on the premium paid to the freeholder, using standard residential rates. After extension, ground rent typically drops to zero (peppercorn rent), so no NPV calculation.

Voluntary Lease Extension

If you negotiate a lease extension outside the statutory route, SDLT applies on both premium and NPV of any ongoing rent. Always check if ground rent remains. Use our leasehold extension calculator for estimates.

Surrender and Regrant

Surrendering your old lease in exchange for a new one counts as a grant of a new lease. SDLT applies on premium and NPV. Often used in lease restructuring or property development.

Worked Example: New Lease Grant

If ground rent were £10,000/year (NPV ~£270,000), you'd pay additional SDLT of 1% × (£270k - £125k) = £1,450 on the rent element.

Surrender and Regrant: Overlap Relief, Deemed Surrenders, Reverse Premiums

A surrender and regrant happens when a tenant gives up the existing lease (the surrender) and the landlord grants a new lease on amended terms (the regrant). Common triggers include extending the term, taking additional space, or restructuring the rent profile in a commercial leasing context. For SDLT, the regrant is treated as the grant of a new lease, with SDLT applying to both the premium and the NPV of rent under the new lease.

Overlap relief: avoiding double taxation

Overlap relief is the SDLT mechanism that prevents the same period from being taxed twice. Where a new lease starts from the same point as the surrendered lease, the NPV of the unexpired term remaining on the surrendered lease (calculated at the old rent, discounted at 3.5% from year 1) is credited against the new lease NPV:

SDLT rates then apply only to this taxable NPV figure. If the surrendered lease had a long unexpired term at a substantial rent, the overlap credit can substantially reduce or even eliminate SDLT on the new lease. Conversely, if the surrendered lease had very little time remaining, the overlap credit is minimal and the new lease's full term is effectively taxed from year 1.

Deemed surrenders: lease variations that trigger SDLT

Some lease variations are treated as deemed surrenders and regrants for SDLT purposes — meaning a fresh SDLT calculation arises even though no formal new lease document was signed. The deemed surrender treatment applies where a variation goes beyond what the original lease allowed and a new lease is required to give effect to the change. In practice the line is fact-sensitive and warrants careful legal advice. The stakes are significant: a simple variation has no SDLT consequences; a deemed surrender triggers a fresh NPV computation.

Reverse premiums

A reverse premium is a payment made by the landlord to the tenant as an inducement to take a lease (or to surrender and regrant). Under FA 2003, reverse premiums are not chargeable consideration for the tenant's SDLT calculation — the tenant's SDLT is calculated on the NPV of rent and any premium paid by them, with reverse premiums received treated as falling outside the SDLT charge entirely. This is a useful planning tool in commercial leasing contexts where the landlord wants to retain a tenant on extended terms.

Commercial vs residential treatment

Surrender and regrant is overwhelmingly a commercial-leasing concept. Residential long leases (99-999 years for flats) are rarely restructured this way — lease extensions are usually achieved via a statutory extension under the Leasehold Reform Act 1993 rather than a surrender and regrant. Commercial leases of 5-25 years are far more likely to see surrender-and-regrant restructuring, and the overlap relief and deemed-surrender rules above are designed primarily with that context in mind.

Commercial Lease Renewals

When a commercial lease expires and a new lease is negotiated, the renewal is a fresh transaction for SDLT. Under the Landlord and Tenant Act 1954, most business tenants in England and Wales have security of tenure and the right to a new tenancy, started by the landlord's Section 25 notice or the tenant's Section 26 request. The taxable event is the grant of the new lease, so SDLT applies to any premium and to the NPV of rent under the renewed terms.

This catches long-standing tenants out. If your previous lease was below the £150,000 commercial NPV threshold, a longer term or a higher rent on renewal can push the NPV over the threshold and create a charge, even where no SDLT was due before.

Work out the SDLT on a renewed commercial lease with the commercial lease SDLT calculator.

Buying a Leasehold Flat

Buying a leasehold flat is taxed much like a freehold purchase. SDLT is charged on the lease premium (the purchase price) at the standard residential rate bands, and first-time buyer relief applies in the same way. When you buy an existing flat on the open market (an assignment of the lease), the premium is normally all you pay SDLT on: the remaining term and the ground rent level do not change the calculation.

The exception is a new lease grant, typical of new-build flats bought from a developer, where SDLT can apply to both the premium and the NPV of the ground rent. In practice this rarely adds tax: the Leasehold Reform (Ground Rent) Act 2022 requires new residential leases to be granted at a peppercorn (zero) ground rent, so the NPV is usually £0. Older leases with escalating ground rents can still produce an NPV charge (1% on any NPV above £250,000).

Frequently Asked Questions About Lease Transactions