Lease variation and stamp duty: the rent-rise trap in 2026
There are 3.71 million leasehold titles in England and Wales, and 117,721 leasehold flats changed hands in England during 2025 (HM Land Registry Price Paid Data, figures fetched 12 July 2026). Most leaseholders treat stamp duty as a one-off — paid once, at purchase, and never again. For the overwhelming majority, that is exactly right.
But Stamp Duty Land Tax (SDLT) on a lease is not always a single event. In one specific situation the tax can return years after completion — not when you sell, but when you and your landlord agree to increase the rent. This guide explains when a lease variation is treated as a fresh stamp duty charge, when it is not, and why an ordinary rent review written into your lease is nothing to worry about.
This is general information, not advice.
The starting point: two charges at grant
When a new lease is granted, SDLT can apply to two things at once: any premium (a lump sum, taxed at the ordinary residential rates) and the rent, taxed on its net present value (NPV). How SDLT works on the grant of a new lease covers that mechanism in full. The rent NPV is worked out under Schedule 5 to the Finance Act 2003: the rent payable over the term is discounted at 3.5% a year, then charged at 0% up to £125,000 of NPV and 1% on the slice above.
The rent figure locked in at grant is meant to capture the whole life of the lease. That is why, when you later resell a leasehold flat, there is no second rent charge at all — the buyer pays only on the price. Why a leasehold-flat resale carries no rent charge explains that assignment rule; 111,521 of 2025's 117,721 leasehold-flat sales were resales of this kind.
So where does a second charge come from?
Paragraph 13: a rent rise in the first five years
Schedule 17A to the Finance Act 2003 holds the answer. Under paragraph 13, if a lease is varied to increase the rent — as from a date before the end of the fifth year of the term, and not under a provision already in the lease — the variation is treated as if it were the grant of a new lease in consideration of the additional rent.
In plain terms: a mid-lease renegotiation that pushes the rent up, in the early years, is a fresh stamp duty event. The deemed new lease runs for the unexpired part of the original term, and the tax is worked out on the extra rent only, using the same NPV method as any grant.
Because there is no premium, the charge is NPV-only. Here is how it lands at a few illustrative levels (residential bands: 0% up to £125,000 of NPV, 1% on the slice above):
| Additional rent agreed | Unexpired term | Rent NPV (3.5% discount) | SDLT on the variation |
|---|---|---|---|
| +£6,000 a year | 12 years | ~£57,980 | £0 (but notifiable) |
| +£12,000 a year | 15 years | ~£138,200 | £132 |
| +£15,000 a year | 15 years | ~£172,800 | £478 |
| +£20,000 a year | 20 years | ~£284,200 | £1,592 |
The pattern mirrors what we see on ordinary lease grants: for typical residential rents the NPV sits below £125,000, so the tax is often nil — but the event can still be notifiable (more on that below).
What is not caught
The most important line in paragraph 13 is the exclusion. An increase is only caught if it is not made under a provision of the lease. Anything the original lease already provided for was priced into the grant-date NPV and is not taxed again:
| Rent change | Caught as a deemed new grant? |
|---|---|
| RPI or index-linked review written into the lease | No — already priced into the grant-date NPV |
| Stepped rent set out in the original lease (e.g. £X for years 1–5, £Y after) | No — already in the original NPV |
| Open-market rent review clause contained in the lease | No — the review mechanism was part of the grant |
| A fresh, negotiated increase the lease did not provide for, in the first five years | Yes — deemed grant over the additional rent |
| Any increase taking effect after the fifth year | No — outside paragraph 13 |
This is the reassurance most leaseholders need. An RPI-linked ground rent, a stepped rent schedule, or a standard open-market rent-review clause is part of a deal that was already taxed at grant. It does not create a new charge when it bites. Only a genuinely new bargain — one the lease did not contemplate — can be a deemed grant.
The notification catch — even at £0 tax
As with any lease grant, the sting is often the paperwork, not the tax. A grant of a lease of seven years or more must be reported to HMRC within 14 days unless both the premium is under £40,000 and the annual rent is under £1,000. A deemed grant under paragraph 13 has no premium, so notification turns on the additional rent: if the unexpired term is seven years or more and the extra rent is £1,000 a year or more, a return is due — even where the tax works out at nil. That £40,000 figure is the same threshold that catches transfer-of-equity filings on the freehold side.
After the fifth year
Paragraph 13 applies only to increases taking effect before the end of the fifth year of the term. An increase agreed later — a genuine renegotiation in year eight, say — falls outside the deemed-grant rule. A separate charge once applied to an "abnormal" rent increase after the fifth year, but those provisions were repealed more than a decade ago as part of a stamp duty simplification and do not catch increases arising now. For a routine leaseholder, the practical exposure sits almost entirely in that first five-year window.
Two related events have their own rules. Extending a lease, or surrendering it and taking a new one, is a fresh grant that can carry its own rent NPV — subject to overlap relief, which strips out rent already taxed on the surrendered lease. And the non-residential and mixed-use rent NPV bands work differently again, with a £150,000 nil-rate band and a 2% top slice. If your interest is a flat-over-shop or a live-work unit rather than a plain residential flat, those bands — not the residential ones above — apply.
Context: why this rarely bites in 2026
Two things keep this charge narrow in practice. First, the Leasehold Reform (Ground Rent) Act 2022 restricted ground rent on most new residential long leases to a peppercorn from 30 June 2022, so the rent NPV on a modern lease is negligible to begin with — and a variation of a near-zero rent has little to increase. Second, the exclusion for built-in reviews means the vast majority of rent changes leaseholders actually experience are already accounted for.
The situation where paragraph 13 genuinely applies is the mid-term, off-schedule renegotiation — more common in commercial and mixed-use settings than in an ordinary flat. If you want to understand where your own lease sits, start with the difference between freehold and leasehold, then see the all-in monthly cost of a comparable flat by entering a Manchester city-centre postcode such as M1 1AE into the Homecost tool.
The bottom line
- Stamp duty on a lease is fixed at grant and is not recharged when you sell.
- A negotiated rent increase in the first five years, outside the lease's own terms, is treated as a new grant and taxed on the extra rent's NPV.
- Built-in reviews — RPI, stepped rent, open-market clauses — are not caught.
- Even at nil tax, a deemed grant of seven years or more with £1,000-plus additional rent must be reported within 14 days.
Rent NPV figures above are illustrative, calculated on the standard 3.5% discount and the residential bands (HMRC, 2026). Your position depends on the exact wording of your lease and the date any increase takes effect. Speak to a qualified adviser before acting.
Based on 3.71 million leasehold titles and 117,721 leasehold-flat transactions recorded in England in 2025 (HM Land Registry). Browse the full library of cost guides.