Hamptons has found that 41,483 buy-to-let companies were formed in Great Britain in the first eight months of 2026, an 8 percent fall on the 44,802 registered in the same period last year.
The slowdown sharpened in August, when formations fell 22 percent year on year. If that pace continues, 2026 would be the first full year since 2008 in which the number of new buy-to-let companies declines.
The change matters because incorporation has been one of the main ways landlords have responded to mortgage-interest tax restrictions. The latest figures suggest future growth in company-owned rental stock will depend more on fresh purchases than on owners transferring homes they already hold.
August formation fall puts 2026 on track for first decline
Hamptons says the total number of active buy-to-let companies still rose to 469,165 by the end of August. New formations continue to exceed closures, and the annual flow remains about eight times higher than it was a decade ago.
But the direction of travel has changed. The 8 percent fall across January to August follows a record 2025, when the structure was still expanding rapidly. A single month does not settle the annual outcome, but August’s drop from 5,363 formations to 4,198 makes the prospect of a full-year decline more credible.
This follows Landlord Knowledge’s April report forecasting 432,000 landlord companies in 2026. Hamptons’ new count is not a measure of all company-owned rental homes, but it shows that the expected growth in new vehicles is losing momentum as the transfer boom runs out of road.
Transfer costs slow the incorporation phase
Hamptons attributes much of the earlier surge to landlords moving personally held properties into limited companies after tax changes made personal ownership less attractive for many higher-rate taxpayers. It estimates that 53 percent of homes put into company structures in 2025 were existing assets transferred from personal ownership, rather than newly acquired buy-to-let homes.
That route can trigger both Capital Gains Tax and Stamp Duty Land Tax. Hamptons puts the average Stamp Duty Land Tax bill on those transfers at about £28,000, based on an average property value of £380,000, and estimates that transfers generated around £1.2bn a year for the Treasury.
Those costs help explain why incorporation should not be treated as an automatic tax saving. Landlords considering a transfer need to compare the current tax and transaction bill with the longer-term position, taking account of mortgages, relief eligibility and their plans for the property. Landlord Knowledge recently covered how company ownership has passed 50 percent among larger portfolios, but the decision is less straightforward for an existing, smaller holding.
New purchases take the lead
For the first time, Hamptons says 51 percent of properties entering limited-company structures this year have been new purchases rather than transfers. That does not mean incorporation is disappearing. It changes what the formation numbers are likely to reveal about landlord behaviour.
Fewer formations may now reflect fewer investors buying, a pause in investment decisions, or simply the completion of the post-2016 restructuring wave. The figures alone cannot distinguish between those explanations. They do, however, remove a source of demand that had been driven by existing owners changing legal structures rather than adding homes to the rental market.
Hamptons’ September analysis also found that new-let rents reached £1,419 a month in August, up 2.4 percent year on year. That combination – softer company formation and rising new-let rents – is a reason to watch investment flows closely rather than assume the next supply response will arrive through incorporation.
What this means for landlords
- If you are weighing incorporation: model Stamp Duty Land Tax, Capital Gains Tax, legal costs and refinancing before moving an existing property.
- If you are buying through a company: the structure remains common for new purchases, but it does not remove the need to test the deal against company mortgage rates and running costs.
- Watch for: the final 2026 formation count. It will show whether August was a sharp monthly interruption or the first annual fall since 2008.
- Bottom line: the incorporation boom is slowing because fewer portfolios are left to restructure, not because company ownership has stopped being important to new buy-to-let investment.
Editor’s view
Company structures have become normal in buy-to-let, but they are not a free reset button for an existing portfolio. A slowing formation count is a useful warning against assuming that incorporation will keep adding rental stock at the pace seen in recent years.
Author: Editorial Team – UK landlord & buy-to-let news, policy, and finance
Published: 14 September 2026
Sources: Hamptons September 2026 analysis
Related reading: Landlord company formations forecast to hit 432,000 in 2026
