Stamp Duty on Property Incorporation UK: Do You Pay It Twice?

Landlords asking about stamp duty on property incorporation in the UK are usually asking one specific question: having already paid SDLT when they bought each rental, do they now pay it a second time to move those same properties into their own limited company? The blunt answer is that in economic terms you do. The transfer to your company is a separate land transaction and there is no credit for the stamp duty you paid the first time round.

Whether the second charge actually lands is a different question, and three routes in the legislation answer it differently: genuine partnership incorporation under FA 2003 Schedule 15, the automatic six-dwellings deeming at section 116(7), and group relief at Schedule 7 for later intra-group moves. Each has a three-year rule attached that can pull the saving back after the return has been filed and accepted. Those routes, and the traps, are what follows. The figures used along the way are totals rather than band-by-band workings, and each is calculated on our SDLT cost of transferring property to a company.

Do I pay stamp duty twice on incorporation?

Yes, in substance. Stamp duty land tax is charged on acquisitions of chargeable interests, not on owners. When you bought a rental personally, that purchase was charged. When your company acquires the same property from you, that is a fresh acquisition by a different legal person, and it is charged again. Nothing in FA 2003 nets the two off, gives relief for the earlier tax, or treats the company as a continuation of you.

The reason the question feels unfair is that no economic ownership has changed. You owned the property before and you own the shares in the company that owns it afterwards. SDLT does not look through that. It looks at the legal transfer of the chargeable interest, and it charges it.

Stamp duty when moving property into a company: why the charge arises

Section 53 FA 2003 does the work. Where the buyer is a company connected with the seller, the chargeable consideration is deemed to be not less than the market value of the property. Your wholly owned NewCo is connected with you, so the deeming bites on every incorporation transfer.

Stamp duty on incorporation of a company: the trigger

That deeming has three practical consequences that catch landlords out. First, transferring at original cost, at the outstanding mortgage balance, or for no consideration at all makes no difference: market value is substituted. Second, the company is treated as having no main residence, so the 5% additional dwellings surcharge that has applied since 31 October 2024 attaches to its first acquisition as much as its tenth. Third, the charge falls due within 14 days of the effective date whether or not any cash has moved, so the money has to come from somewhere other than the transaction itself.

That is as far as this page goes on the size of the charge, deliberately. For the rate tables, the treatment of the 17% flat rate on single dwellings above £500,000, and worked band-by-band calculations, use the connected-party transfer cost guide. For the mechanics of executing the transfer itself, see how to transfer property into a limited company.

Is there SDLT relief on incorporation?

There is no relief in the SDLT code called incorporation relief. The phrase belongs to section 162 TCGA 1992, which is a capital gains relief. Landlords search for SDLT incorporation relief and find CGT material, which is the root of a great deal of confusion. What the SDLT code actually offers is set out below.

Route	Statutory hook	SDLT outcome	Core condition	Trap
Standard connected-party transfer	s.53 FA 2003	Full market-value charge plus 5% surcharge	None, this is the default	No credit for SDLT paid on the original purchase
Partnership incorporation	Sch 15 para 18, SLP at para 20	Market value reduced by the sum of the lower proportions, can reach nil	A real, pre-existing letting partnership and matching share proportions	Para 17A bites on the earlier transfer INTO the partnership, for 3 years
Six or more dwellings	s.116(7) FA 2003	Non-residential rates, no additional dwellings surcharge	Six or more separate dwellings in a single transaction	Splitting the portfolio across transactions loses it
Group relief	Sch 7 paras 1 to 5	Transfer free of SDLT	75% group on all three limbs of para 1(3)	Withdrawn if the transferee leaves the group within 3 years
Multiple Dwellings Relief	Sch 6B FA 2003, repealed	Unavailable	None	Abolished for effective dates on or after 1 June 2024

What is no longer available: Multiple Dwellings Relief

MDR was the standard portfolio incorporation answer from 2011 to mid-2024. It calculated SDLT on the average price per dwelling rather than the aggregate, which cut the effective rate sharply on a multi-property transfer. Finance (No.2) Act 2024 section 7 repealed Schedule 6B FA 2003 in full, and the relief is unavailable for any land transaction with an effective date on or after 1 June 2024. Anti-forestalling rules in the same Act block sub-sale and option arrangements designed to crystallise a claim before the cut-off.

Contracts entered into and substantially performed before 1 June 2024 sit in a narrow transitional cohort. For anything being planned today, MDR is gone, and any guide still recommending it for an incorporation is out of date. The official confirmation is the gov.uk MDR abolition guidance.

The partnership route to avoid SDLT on incorporation (FA 2003 Sch 15)

Stamp duty land tax on incorporating a partnership in the UK works on a different formula from an ordinary sale. The step out of the partnership into a company owned by the partners is charged under FA 2003 Schedule 15 paragraph 18, which sets the chargeable consideration at market value multiplied by one minus the sum of the lower proportions, calculated under paragraph 20. Where the partners take all the shares in the same proportions as they hold the partnership, that sum reaches 100% and the chargeable consideration falls to nil.

Paragraph 10 is the mirror rule for transfers into a partnership, with its own SLP calculation at paragraph 12. It is frequently misquoted as the incorporation rule. The incorporation step is a transfer out, so paragraph 18 is the operative provision. The full five-step SLP arithmetic, the connected-persons definition imported from CTA 2010 section 1122, and the partnership-share definition at paragraph 34 are covered in our Schedule 15 sum of the lower proportions guide. HMRC's manual anchor is SDLTM33500 onwards, not the s.75A pages that are sometimes cited in error.

What HMRC actually look for

The threshold is substance, not paperwork produced at the last minute. A partnership entered into shortly before incorporation, purely to reach the relief, invites attack under the section 75A general anti-avoidance rule. The evidence HMRC expect includes:

• A partnership agreement predating the incorporation by the whole period being claimed as the trading window.
• SA800 partnership returns filed for each of those years, with rental income reported through the partnership and allocated on partnership shares rather than by each owner's beneficial interest in individual properties.
• Partnership accounts and a partnership bank account, kept separately from any individual landlord account.
• Joint borrowing in the partnership name or with joint liability. Mortgages in one spouse's sole name are a strong negative indicator.
• Operational evidence: tenancies granted by the partnership, managing agent and insurance documentation in the partnership name, lender correspondence addressed to the partnership.

Where these are absent, which is the ordinary position for jointly owned portfolios reported on individual SA105 property pages, the route is simply not available and the standard market-value charge applies. Building a genuine partnership first is possible, but it takes years rather than weeks and the transfer in has its own SDLT consequences that need sequencing.

SDLT and business incorporations: the 3-year trap

Landlords who reach a nil SDLT outcome often assume the matter is closed at completion. Two separate three-year rules say otherwise, and both are commonly missed because they bite long after the return has been filed and accepted.

The SDLT incorporation relief 3-year rule

Schedule 15 paragraph 17A is the anti-withdrawal rule, and the point most often got wrong is which transfer it attaches to. It does not bite on the paragraph 18 incorporation transfer out. It bites on the earlier step, the transfer of property into the partnership under paragraph 10 or a transfer of a partnership interest under paragraph 14, which is how the portfolio usually got into the partnership in the first place. For three years after that transfer in, any qualifying event is itself a chargeable transaction: withdrawing capital from the partnership, repaying a partner's loan, reducing a partner's interest, or a return of capital in any form. The charge cannot exceed the market value of the interest originally transferred, less any amount already charged.

That matters on an incorporation timeline because a landlord who moved properties into a partnership and then incorporates within three years is operating inside a live window. The incorporation itself is not a paragraph 17A qualifying event, but the capital movements that commonly accompany it can be, and the rule exists precisely to stop the SLP mechanism being used as a quick route in and straight back out.

The group relief 3-year claw-back

Schedule 7 paragraph 3 withdraws group relief where the transferee company leaves the 75% group within three years of the effective date, with tax then charged at market value rates on the original transaction. This is the operational risk in multi-SPV restructuring: a landlord consolidates properties into an SPV under group relief, then sells the SPV two years later, and the sale triggers the claw-back. Paragraph 5 lets HMRC recover unpaid SDLT from the vendor company, the group parent or a controlling director if it is still outstanding six months after assessment. Paragraph 2 separately denies relief at the outset where arrangements already exist for the transferee to leave the group. The claw-back mechanics are covered in depth in our Schedule 7 group relief guide.

The practical response to both is documentary. Do not withdraw partnership capital or restructure partner interests inside the three-year window without modelling the charge first, and lock any group-relief transferee into the group with a covenant in the sale agreement for the balance of the three years.

The six-dwellings rule: automatic, not an election

Section 116(7) FA 2003 provides that where six or more separate dwellings are the subject of a single transaction involving the transfer of a major interest, the dwellings are treated as not being residential property. Non-residential rates then apply, and the 5% additional dwellings surcharge does not.

Two points matter. First, this is a statutory deeming, not an election and not a relief. There is no claim, no relief code and no box to tick: the buyer simply reports the transaction on the non-residential basis. Guides that describe it as an election, or that cite Schedule 6B paragraph 7 as the source, are wrong on both counts, and Schedule 6B was repealed with MDR in any event. Second, the six dwellings must be within a single transaction, or within linked transactions under section 108, so the way the incorporation is documented determines whether the rule applies at all. A portfolio split into separate contracts on separate days can fall out of it.

The rule survived the MDR abolition untouched, which makes it the principal route for portfolio-scale incorporations where no partnership exists. It is an SDLT rule, so it covers England and Northern Ireland. Scotland has an equivalent at section 59(8) LBTT(S)A 2013. Wales runs its own LTT rules on multi-dwelling acquisitions and a Welsh portfolio needs advice on that basis rather than an assumption carried over from SDLT.

Worked example: a £1m six-flat portfolio, three routes

Sophia and her brother Daniel own six flats in Manchester worth £1m in total. They incorporate in a single transaction in May 2026, taking 50/50 shares in the new company. The interesting number here is not the charge itself but the spread between the routes.

Route	Basis	SDLT	Delta vs standard
Standard connected-party transfer, residential basis	Market value plus 5% surcharge on the £1m aggregate	Around £93,750	Baseline
Six dwellings in one transaction, s.116(7)	Non-residential deeming, automatic, no surcharge	Around £39,500	Around £54,250 saved
Genuine partnership incorporation, Sch 15 para 18	Market value less 100% SLP	Nil	Around £93,750 saved

If the partnership has filed SA800 returns since 2022, runs partnership accounts and borrows jointly, the paragraph 18 line is the one that applies and the SDLT is nil. If it does not, the transaction still reaches the section 116(7) line automatically, because six dwellings move together in one transaction. Splitting the portfolio into two tranches of three flats does not automatically forfeit the deeming, because section 108 treats linked transactions as one for this purpose and tranches of the same incorporation are normally linked. The deeming is lost only where the tranches are genuinely not linked, for example separate bargains agreed at different times with different parties.

Both rated figures above are totals; the band-by-band workings behind them are on our connected-party transfer cost guide.

The £93,750 gap is the value of the partnership evidence, and HMRC price it that way too. If the documentation does not hold up under enquiry, they reassess to the standard basis with interest and a tax-geared penalty.

Worked example: a £600,000 two-flat portfolio with no route

Mark and Helen jointly own two London flats worth £300,000 each. They have always filed individual SA105 property pages showing half the rents each. There is no partnership agreement, no SA800 and no partnership bank account, so they are not a partnership. Two dwellings is below the section 116(7) threshold. There is no existing company, so there is no group.

Route	Available?	SDLT
Sch 15 para 18 partnership	No, joint ownership is not a partnership	Not available
s.116(7) six dwellings	No, only two dwellings	Not available
Sch 7 group relief	No, no existing group	Not available
Standard connected-party transfer	Default	£50,000 on the £600,000 aggregate

This is the ordinary outcome for small jointly held portfolios, and it is worth stating plainly because a great deal of online material implies a route always exists. For Mark and Helen the incorporation decision is not a relief question at all: it is whether the recurring tax saving recovers £50,000 of SDLT, plus refinancing and professional costs, over their intended hold period. Our guide to phasing an existing portfolio incorporation covers how that decision changes when the transfer is spread over several years.

How to claim incorporation relief on the SDLT return

The filing mechanics differ by route, which is where returns most often go wrong.

1. Partnership relief. Report the transaction on the SDLT1 within 14 days of the effective date, entering the relief code for partnership transactions and showing the chargeable consideration as market value reduced by the sum of the lower proportions, not as market value with a deduction elsewhere. Keep the SLP calculation on file.
2. Six-dwellings treatment. Nothing is claimed. The transaction is simply reported as non-residential. Do not enter a relief code.
3. Group relief. Must be positively claimed on the return. A claim missed within 12 months of the effective date can be pursued as an overpayment claim under FA 2003 Schedule 11A within four years, though a late claim invites enquiry.
4. Land Registry. HM Land Registry will not register the transfer to the company without the SDLT5 certificate, so the return drives the title timetable as well as the tax.
5. ATED relief declaration. Where any single dwelling is worth more than £500,000 at acquisition, file the ATED relief declaration by 30 April following acquisition, and annually thereafter.

Late filing penalties start at £100, rise to £200 after three months and become tax-geared after twelve, with interest running from the due date. The 14-day clock starts at the effective date, which is normally completion but can be earlier if substantial performance happens first.

How the SDLT charge interacts with CGT

The transfer is also a deemed disposal at market value for capital gains tax. Section 162 TCGA 1992 can defer that gain by rolling it into the base cost of the shares received, and for transfers on or after 6 April 2026 the relief must be positively claimed rather than applying automatically.

The point to hold on to is that the two taxes do not talk to each other. Claiming section 162 does nothing for SDLT, and reaching a nil SDLT outcome under Schedule 15 does nothing for CGT. A portfolio can face full stamp duty and a fully deferred gain, or nil stamp duty and an immediate gain, depending on which sets of conditions are met. The statutory CGT test itself is covered in our guide to section 162 incorporation relief and the practical planning in incorporating rental property without a CGT charge. HMRC's reference is CG65700 onwards.

Can you avoid stamp duty on incorporation?

Only by falling inside one of the statutory routes above. No scheme, trust or wrapper lawfully removes the charge on a transfer that does not qualify, and arrangements sold on that promise are exposed to the general anti-avoidance rule at section 75A FA 2003. In practice the honest options are:

• Genuine partnership incorporation, where a real letting partnership already exists and can be evidenced over a sustained period.
• Six or more dwellings in a single transaction, where the deeming applies automatically and the structuring question is simply how the transfer is documented.
• Group relief, for moves between companies already in a 75% group, subject to the three-year claw-back.
• Not incorporating, which is the right answer whenever the recurring saving does not recover the one-off cost across the intended hold period.

Where none of these apply, the SDLT is a cost of the decision rather than a problem to be solved. The step-by-step execution sequence, once the decision is made, is set out in our guide to incorporating a property portfolio in 2026.

Related reading

• SDLT on Transferring Property to a Company: The Cost
• Schedule 15 Partnership SDLT Relief and the Sum of the Lower Proportions
• How to Transfer Property into a Limited Company
• Incorporating a Property Portfolio in 2026
• Incorporating an Existing Portfolio: The Phased Approach
• Stamp Duty on Buy-to-Let: the 5% Surcharge