The question of whether landlords should transfer their property portfolio into a limited company in 2026 has moved from a niche planning conversation to something almost every multi-property landlord is having with their accountant. The combination of the Section 24 mortgage interest restriction, rising corporation tax rates that are still lower than the higher-rate income tax bands, and a further rental income surcharge landing in April 2027 has made limited company structures genuinely compelling on paper.

The problem is that the maths looks very different once you factor in the cost of actually making the move. Stamp Duty Land Tax and Capital Gains Tax on a transfer of personally held properties can run to tens of thousands of pounds — sometimes more — before you've booked a single pound of tax saving inside the company.

Our take: the limited company structure is the right answer for a lot of landlords in 2026, but the right moment and the right structure depend heavily on your individual position. Here's how we think through it.

Section 24, which took full effect from April 2020, changed the way individual landlords can account for mortgage interest. Rather than deducting finance costs from rental income before calculating your tax bill, you now receive a basic-rate tax credit of 20% on the interest you pay. For basic-rate taxpayers that's roughly revenue-neutral. For anyone paying income tax at 40% or 45%, it's a significant and ongoing cost.

The practical effect is that you can find yourself paying tax on income that has already been absorbed by mortgage payments. A landlord with £50,000 of rental income, £25,000 of mortgage interest, and £5,000 of other allowable expenses is taxed on £50,000 of income with a credit for the interest — not on the £20,000 net profit the numbers would suggest. At higher rate, that creates a materially higher tax bill than the pre-Section 24 position.

A limited company sidesteps this entirely. Companies can deduct mortgage interest in full before calculating taxable profit — the old rules, preserved for corporate landlords. Combined with a corporation tax rate of 19% on profits up to £50,000 (rising to 25% at the full rate above £250,000), the saving for a leveraged landlord generating meaningful rental income can be substantial year on year.

There is also a further change on the horizon: a 2% surcharge on rental income is due from April 2027, and current indications are that this will not apply to limited companies. For landlords planning their structure over a five-to-ten-year horizon, that adds another reason to look carefully at incorporation.

This is where many landlords stop short — and with good reason. Transferring personally held properties into a limited company is not a straightforward restructure. In HMRC's eyes it is a disposal followed by a new acquisition, and both sides of that transaction attract tax.

Stamp Duty Land Tax

The company purchasing the properties pays SDLT at the standard rates plus the higher rates for additional dwellings. This can amount to a substantial upfront cost on a portfolio of any size, and it is payable regardless of whether the transfer is between connected parties at market value or below it. HMRC will apply market value rules to connected-party transactions, so there is no straightforward way to reduce the SDLT exposure by keeping the price low.

Capital Gains Tax

The landlord disposing of the properties crystallises any accumulated capital gain at the point of transfer. For residential property, the current CGT rates for higher-rate taxpayers stand at 24% on the gain above the annual exempt amount. On a portfolio that has seen significant appreciation, this liability can dwarf the annual tax savings the limited company would deliver — and it is payable in the tax year of disposal, not spread forward.

The combined effect of SDLT and CGT means that transferring an established portfolio can cost more in tax on the way in than the structure is likely to save in its first several years of operation. That is not a reason to rule it out — but it is a reason to model it carefully before committing.

Incorporation Relief is a legitimate mechanism that allows Capital Gains Tax to be deferred — not eliminated — when you transfer a business to a company in exchange for shares. If it applies, the gain is rolled into the base cost of the shares rather than triggering an immediate tax charge.

The difficulty is that HMRC's position on whether a property rental portfolio constitutes a business for Incorporation Relief purposes has always been restrictive. The relief was designed with trading businesses in mind. HMRC tends to treat property letting as an investment activity rather than a business unless there is substantial, active involvement in managing the properties — typically interpreted as something closer to a property management or servicing operation rather than a passive rental portfolio.

Case law has tested this boundary over the years and the results have been mixed. For a landlord with a large portfolio who is materially involved in the day-to-day management — not simply collecting rent through an agent — there may be an argument. But for the majority of landlords with a handful of buy-to-let properties managed through a letting agent, Incorporation Relief is unlikely to be available without a robust and defensible case.

It is worth noting that even where the relief does apply, it defers CGT rather than removing it. If you eventually sell your shares, the rolled-over gain becomes chargeable at that point. It is a timing benefit, not a permanent saving, and the value of that deferral depends on what CGT rates look like when you exit.

If you believe Incorporation Relief might apply to your situation, this is emphatically a conversation to have with a qualified adviser before taking any steps — not something to claim retrospectively.

The limited company solves the Section 24 problem. It does not solve everything.

Profits retained inside the company are taxed at the corporation tax rate. So far, so good — that rate is lower than the higher-rate income tax bands. But if you want to take money out of the company and use it personally — for living expenses, for other investments, for anything — you pay again. Dividends drawn from the company are taxed at 8.75% (basic rate), 33.75% (higher rate), or 39.35% (additional rate) depending on your total income in the tax year.

The combination of corporation tax and dividend tax can, depending on the numbers, produce an effective rate that is not dramatically lower than the income tax position you were trying to escape. The limited company structure genuinely benefits landlords who can leave significant profits inside the company — either to reinvest in further properties or to accumulate as a pension-substitute — rather than those who need most of the rental income to fund their lifestyle each year.

This is a point we raise with every landlord considering incorporation. The tax saving at company level is real. The extraction cost is also real. The net benefit depends on how much money actually stays inside the company over time, and that depends on your personal circumstances, not just the structure.

Our honest view is that the limited company structure makes the most sense in two distinct situations.

The first is landlords who are buying new properties and have not yet committed to personal ownership. Buying through a limited company from the outset avoids the SDLT and CGT transfer problem entirely. There is no prior gain to crystallise, no second charge of stamp duty on a connected-party disposal. The company acquires the asset directly and the favourable treatment of mortgage interest and the lower corporation tax rate apply from day one.

The second is landlords with large, highly leveraged portfolios generating significant net rental profit — particularly where a material proportion of that profit can remain inside the company. The annual tax saving in these cases can be large enough to justify paying the transfer costs, provided the break-even timeline is acceptable and the CGT position is manageable. This typically requires proper modelling, not a back-of-envelope calculation.

For a landlord with two or three properties, modest borrowing, and a personal income that sits comfortably within the basic-rate band, incorporation in 2026 is unlikely to be worthwhile. The compliance costs of running a company — annual accounts, corporation tax returns, confirmation statements, director's responsibilities — add friction and cost that can offset the tax benefits at smaller scale.

If you are uncertain where you fall, the most useful thing you can do is model your position properly across a five-year horizon, including the transfer costs, the annual savings, the extraction costs, and the compliance overhead. That exercise tends to give a clear answer fairly quickly.