Stamp duty on a block of flats, and what a title split does to it

The short answer

Stamp duty on a block of flats depends on three things: how many dwellings you are buying in one go, whether any part of the building is commercial, and how the purchase is structured. In England, six or more dwellings in a single transaction, or any mixed-use building, is taxed at the non-residential rates rather than the residential ones. At the prices blocks change hands for, that is a much smaller bill. Wales has the same rule under its own tax, Land Transaction Tax, and still offers a relief that England withdrew. A title split itself adds no tax, provided the new leases are granted inside one group of companies. Buy the freehold in one company and grant the leases to an unconnected company and you can be taxed twice.

That is the whole guide in one paragraph. The rest explains each piece, with the worked figures we use when we stack a deal ourselves. One rule before we start: we are investors, not tax advisers. The bands below were checked on 30 October 2026 and the sums come from our own calculator, but your accountant signs off your deal, not this page.

The rule of six

Stamp Duty Land Tax in England has two sets of rates. The residential rates apply to houses and flats, and most investors pay them with the surcharge for additional dwellings on top. The non-residential rates apply to shops, offices, land, and, this is the part that matters, to any purchase of six or more dwellings in one transaction. Buy five flats on one title and you are a residential buyer. Buy six and the whole purchase moves onto the non-residential rates.

Here is what that does to the bill, on the bands checked on 30 October 2026. The residential column is the rate most investors pay, with the additional-dwelling surcharge included.

On a million-pound block the difference is more than £54,000. On two million it is over £164,000. That is not a rounding error in a deal stack; it is the deposit on the next block. It is also why the flat count is the first thing we look at on any listing, and why a block of six is worth more to us than a block of five at the same price per flat.

A warning we give every cohort: the solicitor's stamp duty calculation is usually wrong on these purchases, because most conveyancers see a block of flats and reach for the residential rates. Work the figure out yourself, or have your accountant do it, and check the completion statement line by line before the money goes.

Mixed use: the shop is your friend

The second route onto the non-residential rates needs no flat count at all. A mixed-use purchase, a building with any commercial part, is taxed at the non-residential rates in England and Wales however few flats sit above it. One shop with one flat over it qualifies. A block of four flats with an office on the ground floor qualifies.

Most investors walk past mixed-use blocks because the commercial unit looks like a complication. For a title split it is the opposite: the stamp duty treatment is better, commercial agents tend to price on income rather than on bricks and mortar, and the flats above are valued flat by flat once they have their own titles. A mixed-use block in Wales we bought for £231,000 carried a stamp duty bill of £65, because the non-residential bands there do not start until £225,000. The same money on five residential flats would have been taxed at the residential rates from the first pound.

Two cautions. First, the commercial part has to be genuinely commercial on the day you buy, so look at what the unit is actually being used for and what the lease says. Second, where a seller has opted to tax the building for VAT, the whole purchase price can carry VAT. That is a separate question with its own answers, and it needs an accountant with a proper VAT team rather than a general practitioner. Bring them in before you exchange, not after.

Wales: the same shape, and a relief England lost

Wales replaced stamp duty with Land Transaction Tax, which has its own bands and rates but the same structure: residential rates for five dwellings or fewer, non-residential rates for six or more or for mixed use. On the bands checked on 30 October 2026 the Welsh non-residential bill on a million-pound block is £37,750, against £111,200 at the Welsh residential rates with the higher-rate surcharge.

The difference that matters is multiple dwellings relief. England withdrew it. Wales still has it. Where a Welsh building qualifies both as six or more dwellings and for the relief, our reading of the Welsh guidance is that you can take whichever route gives the lower bill, so we run both and choose. Which one wins depends on the price per flat, which is why we built the calculation into our free title split calculator: give it the price, the flat count and the country, and it works out the lowest legal route. Treat the answer as a working figure for your deal stack, and have your accountant confirm it before completion.

Linked transactions: getting to six by other means

Here is the piece almost nobody outside our cohorts knows. If you buy two properties from the same seller into the same buying company, the tax rules can treat them as one linked transaction. Two blocks of three flats from one vendor, bought together, are six dwellings in one transaction. A block of four flats plus a small commercial unit from the same vendor is a mixed-use purchase. The buildings do not have to be next door to each other.

We have used this ourselves on two blocks of four in the same city, bought together from one vendor at about £650,000 each, which took the whole purchase onto the non-residential rates. It is also the reason we ask a seller what else they own before we make an offer: a lock-up, a shop, a second small block can change the tax on the first one.

This is the point in the conversation where we say "here be dragons". Linked transaction rules cut both ways, they are the kind of detail that changes at a Budget, and getting them wrong is a tax enquiry rather than an inconvenience. Ask a chartered tax adviser or an accountant who does property, and ask them before the offer goes in, because the structure has to be in place at exchange.

The title split itself: one group, one charge

A title split creates new leases, and the grant of a lease is itself a land transaction. So the obvious question is whether splitting the block triggers a second stamp duty bill on top of the purchase. The answer is no, if the structure is right, and potentially yes if it is not.

You cannot grant a lease to yourself, so every split needs two legal entities: a landlord and a tenant. The structure we teach and use is a group. A holding company buys the freehold. A subsidiary sits underneath it. On completion day, in the same sitting, the holding company grants the long leases of each flat to the subsidiary. Because both companies are in the same group, the lease grants qualify for group relief and there is no second charge.

Do the same thing with two unconnected companies, your own company buying the freehold and a friend's company taking the leases, say, and you have two land transactions and two bills. We have seen it proposed. The fix is cheap and the mistake is not.

Two things to ask your adviser about the group. First, the clawback: group relief can be withdrawn if a company leaves the group within a set period, so a plan to sell the leasehold company on its own later needs thinking through now. Second, whether you want a separate management company for the service charge. Both are ten-minute questions for someone who does this regularly, and expensive surprises for someone who does not. The full structure, and why the freehold company ends up holding the titles that are worth little while the subsidiary holds the value, is in the process guide.

Buying the company: 0.5% instead of the building

On a large enough block there is a third way to approach the tax, which is to buy the limited company that owns the building rather than the building itself. Stamp duty on a share purchase is usually 0.5% of what you pay for the shares, so on a million-pound company that is about £5,000 against £39,500 at the non-residential rates, and less again if the company carries a mortgage that reduces the value of its shares.

The saving is real and so is everything that comes with it. You step into the company's whole history: its tax position, its debts, anything it has ever done. The legal bill rises because you are now doing a corporate transaction as well as a property one, and a forensic look at the accounts is not optional. Our rule of thumb is that a share purchase is worth a look from about one million pounds, near certain at two million, and case by case below one, because the stamp duty saving grows with the price while the risk of unknown history does not. The full picture, including how the funding can work in your favour, is in the share purchase guide.

How we use all this when we stack a deal

Stamp duty is the second biggest cash line on most block purchases after the deposit, so it goes into the deal stacker before we talk to anyone. Our order of work is simple. Count the dwellings. Look for a commercial part. Ask what else the seller owns. Work the tax out on each route the building qualifies for, England or Wales, and take the lowest legal figure. Then check that figure against what the solicitor sends through before completion, because they will not always agree, and when they do not it is usually the solicitor who has reached for the wrong rates.

What we never do is let the tax tail wag the dog. A block that only works because of a clever structure does not work. The building has to stack on ordinary tenancies at an ordinary valuation first; the tax is where you keep more of what the deal already makes.

Questions people ask about stamp duty on blocks

Related reading

• The free title split calculator. Five numbers in, and it works out the stamp duty or Welsh LTT on the lowest legal route for your flat count.
• Buying the company instead of the block. The 0.5% share route, what it really costs, and the risks you inherit.
• The title split process, step by step. The two-company structure every split needs, and the eight steps from first look to registered titles.
• How much does a title split cost? Every line of the bill, with the allowances we use in our own deal stacking.
• The title split checklist. The five things we check before we offer, including the flat count that sets the tax.
• Deals and Analysis. Session two covers company structure, stamp duty and lease creation, live with James.