The rush by landlords to shelter their portfolios inside corporate structures is running out of steam, with buy-to-let company formations heading for their first annual fall since the financial crisis.
Analysis of corporate filings by the estate agency Hamptons shows 41,483 buy-to-let companies were set up in the first eight months of 2026, down from 44,802 in the same period of 2025. Barring a sharp recovery in the closing months of the year, incorporations are on track for their first annual decline since the property crash of 2008 and 2009.
For investors, that marks the end of a structural shift that has shaped portfolio planning for the best part of a decade, and it has consequences for the Treasury’s tax take as well.
Why buy-to-let company formations are slowing
Aneisha Beveridge, head of research at Hamptons, said company formations by landlords may have peaked last year.
“A large part of the buy-to-let incorporation boom was driven by the one-off structural shift whereby existing landlords transferred properties they already owned into limited company structures in response to tax changes,” she said.
“But we’re now reaching the tail end of that trend. Increasingly, the landlords who stand to benefit financially from incorporating existing properties have already done so.”
The boom was fuelled by tax changes that began in 2016 and made corporate ownership more efficient than holding property personally, among them the phased restriction of mortgage interest relief for individual landlords.
The arithmetic of weighing a limited company against personal ownership has not changed. What has thinned is the pool of landlords for whom the sums clearly stack up and the reducing pool of limited company buy to let mortgages.
New purchases overtake portfolio transfers
Most of the homes moved into company structures in recent years were assets landlords already owned rather than fresh acquisitions. Hamptons estimates that new purchases entering these structures will overtake transfers this year.
That is a material change in the character of the market. After a record run of incorporations last year, the sector is shifting from a one-off restructuring exercise to something closer to ordinary buying activity.
It also means headline formation numbers will increasingly track landlord appetite for new stock rather than accountants’ advice on existing holdings.
The Treasury’s stamp duty windfall starts to fade
Transferring a property from personal to corporate ownership counts as a sale, so each move triggers a tax charge. Stamp duty land tax on those transactions has been bringing in about £1.2 billion a year to the Treasury, the estate agency said.
That levy applies in England and Northern Ireland, with Scotland and Wales operating their own equivalents, so the exposure is not spread evenly across the UK.
Beveridge said growth in company formations “is likely to increasingly depend more on landlords making new purchases than restructuring portfolios. That also means the Treasury’s stamp duty windfall from these transfers is likely to start falling.”
A shrinking revenue line is worth watching. Fiscal events have a habit of finding new ways to tax the same asset class when an old source dries up.
Rents climb as rental supply tightens
The incorporation slowdown arrives as the lettings market turns back in landlords’ favour on price. Figures from the property website Zoopla show UK rents rose 2.6 per cent in the year to July 2026, up from 1.6 per cent growth in February, taking the average monthly rent to £1,340.
Zoopla put the acceleration down to a market that began tightening in May 2026, with 3 per cent fewer properties available to rent than a year earlier. That ended what it described as “a three-year recovery in rental supply which helped reduce the level of rent rises over the last two years”.
The website now expects rents could rise by between 4 per cent and 5 per cent by the end of the year. Landlord exits have been squeezing the supply of rental homes for some time, and the latest figures suggest that pressure is feeding through to rents again.
What this means for investors
The easy tax win from restructuring is largely banked. Landlords who have not incorporated by now are, on Hamptons’ reading, mostly those for whom it was never going to pay, and the decision from here rests on acquisition plans rather than on tidying up what is already owned.
The rent data points the other way. A tighter market and forecast growth of 4 per cent to 5 per cent support yields on stock bought at today’s prices, which strengthens the case for buying inside a company from the outset rather than moving assets later and paying stamp duty twice over.
Expect the Treasury to notice the shortfall. Landlords planning purchases in the next 12 months should assume the tax treatment of corporate buy-to-let will attract more attention, not less, as that £1.2 billion windfall recedes.
