Stamp duty on a statutory lease extension in the UK (2026)

England and Wales have around 3.71 million leasehold homes (HM Land Registry). When the lease on a flat starts to run down, the leaseholder can extend it — and in law a statutory extension is not a simple top-up of extra years. It is a surrender of the old lease and the grant of a brand-new, longer one. On the face of it, that looks like it should attract the full lease-grant stamp duty: a charge on the premium and a separate charge on the rent.

In practice it usually does not, for one reason. The new lease is granted at a peppercorn rent — a nominal rent that is effectively nil. With no rent to value, the rent charge disappears, and the whole Stamp Duty Land Tax (SDLT) question collapses to a single point: is the premium you pay the freeholder large enough to bite? For most flats, it is not.

Two ways to extend a lease

• Statutory — under the Leasehold Reform, Housing and Urban Development Act 1993 (LRHUDA 1993), a qualifying leaseholder of a flat can require the freeholder to grant a new lease. The new lease adds 90 years to whatever is left of the current term and is at a peppercorn (nil) rent. A premium is payable to the freeholder, fixed by a statutory valuation.
• Informal (voluntary) — the leaseholder and freeholder simply agree terms between themselves. The added term, the premium and — crucially — the rent are whatever the parties negotiate. Some informal extensions keep, or even raise, a ground rent.

That difference in the rent is the entire SDLT story, so it is worth pinning down.

Why a statutory extension is a "surrender and regrant"

A statutory extension does not bolt extra years onto the existing lease. Legally, the old lease is given up (surrendered) and a new, longer lease is granted in its place — a surrender and regrant.

Left unmanaged, that could double-count: the surrender looks like consideration for the new grant, and the grant looks like consideration for the surrender. The Finance Act 2003 heads this off. Under Schedule 17A, where a lease is surrendered in return for the grant of a new lease between the same parties, the surrender is not chargeable consideration for the new lease, and the grant is not chargeable consideration for the surrender (see HMRC's Stamp Duty Land Tax Manual). So the only things left to tax on the new lease are (a) any premium paid, and (b) the rent, measured by its net present value.

For a statutory extension, (b) is nil — the rent is a peppercorn. That leaves the premium.

The premium is charged at ordinary residential rates

The premium you pay the freeholder is chargeable consideration, taxed on the same residential SDLT slabs as any purchase: 0% up to £125,000, 2% on the slice from £125,001 to £250,000, 5% from £250,001 to £925,000, and so on (HMRC, 2026). Because most extension premiums are modest, most fall inside the 0% band.

(SDLT figures modelled on Homecost's calculator, England, standard rates, retrieved 13 July 2026.)

Two things stand out. First, extending the lease on a home you already hold does not add a dwelling to your name, so the 5% additional-property surcharge is not triggered merely by the extension — a conveyancer confirms that on the facts. Second, the £40,000 line matters even where the tax is zero, which is the trap most people miss.

The peppercorn rent, and why "overlap relief" rarely bites here

The reason a lease grant can be expensive is the second charge — SDLT on the rent, measured by the net present value (NPV) of all the rent across the term (Finance Act 2003, Schedule 5). On a long lease at a real ground rent, that NPV can be substantial; it is exactly the mechanic that makes the grant of a brand-new lease a two-part calculation.

A statutory extension sidesteps it entirely because the new lease is at a peppercorn. Nil rent means nil NPV means no rent charge, however long the new term.

Where the old lease did carry a rent — and the new one does too, which is typical of an informal extension that retains a ground rent — Schedule 17A paragraph 9 provides overlap relief: the rent already taken into account on the surrendered lease, for the period that overlaps with the new lease, is deducted from the new lease's rent NPV. It stops the same rent being taxed twice across the surrender and the regrant. On a statutory peppercorn extension there is no new rent to relieve, so overlap relief is moot — it is the mechanism that keeps informal, rent-retaining extensions from being over-taxed, not the statutory route.

The filing trap: a £0 bill can still need a return

Here is the counter-intuitive part. The grant of a lease of seven years or more is notifiable — a land-transaction return is due — unless both the premium is under £40,000 and the annual rent is under £1,000 (Finance Act 2003, section 77A). A statutory extension clears the rent half automatically, because a peppercorn is well under £1,000. So notification turns solely on the premium:

• Premium under £40,000, peppercorn rent → not notifiable; nothing to file.
• Premium £40,000 or more → a return is due within 14 days of the effective date, even though the SDLT is £0 right across the £40,000–£125,000 stretch.

That £40,000 figure is the same line that catches a transfer of equity between owners: a bill of nothing is not the same as nothing to do. A statutory extension whose premium creeps above £40,000 — common on flats with a shorter lease left, or in higher-value areas — needs a return filed even when no tax is payable.

Marriage value, the 2024 reforms, and what is still moving

The size of the premium is a valuation question, not an SDLT one, so it sits outside this article — but two points connect. Where a lease has fewer than 80 years left to run, the statutory premium includes marriage value, which can push the premium above the £40,000 notification line, and occasionally above £125,000 into positive SDLT. And the framework itself is changing: the Leasehold and Freehold Reform Act 2024 legislates for 990-year extensions and the removal of marriage value, but its provisions are being brought into force in stages through secondary legislation. The SDLT mechanics described here — premium at residential rates, peppercorn rent, nil rent NPV — are unaffected by those changes, but which premium rules apply on any given claim depends on the commencement position at the time. A conveyancer confirms the current position.

Check the numbers for your own flat

For a statutory (peppercorn-rent) lease extension, the SDLT question is short: the rent charge is nil, and the premium is taxed on the ordinary residential slabs — usually £0, with a 14-day return needed only once the premium reaches £40,000. It is the mirror image of buying the flat itself, where the resale of an existing lease is charged on the price alone. It helps to understand the difference between freehold and leasehold before running any figures.

You can model the SDLT on a given premium with the stamp duty calculator, or look up what leasehold flats have actually sold for on a given street — for example in Manchester's M1 postcode, one of England's busiest flat markets. More breakdowns are in the cost intelligence guides.

This article is general information about how Stamp Duty Land Tax works, not tax or legal advice. Individual circumstances vary, and lease-extension valuations and reform commencement dates change. Speak to a qualified adviser before acting.