Property Company Incorporation: The Complete Guide for UK Landlords

Thinking of moving your buy-to-let portfolio into a limited company? This guide covers SDLT, CGT, and tax savings for UK landlords. Blue Tick explains.

The way rental income is taxed has changed beyond recognition since Section 24 was fully phased in. Individual landlords can no longer deduct mortgage interest as an expense from their rental income. Instead, they receive only a 20% basic-rate tax credit, leaving higher-rate taxpayers facing tax bills that can exceed 40% on rental income that never reached their bank account. Property company incorporation has become one of the most widely discussed responses, and for good reason: a limited company can still deduct mortgage interest in full as a business expense.

But the decision to incorporate is rarely straightforward. Transferring existing properties to a company triggers Stamp Duty Land Tax and potentially Capital Gains Tax, while mortgage lenders impose their own restrictions on limited company lending. The right answer depends on how many properties you own, your long-term goals, your current income tax position, and how long you plan to hold the portfolio.

This guide covers everything UK landlords need to know about property company incorporation: the tax advantages, the upfront costs, the ongoing obligations, and a practical framework for deciding whether incorporation makes sense for your portfolio.

In this guide:

Why Section 24 is pushing landlords to consider incorporation
The tax advantages of a limited company buy-to-let structure
SDLT and CGT: the real costs of transferring existing properties
Mortgage lending and lender restrictions
Annual Tax on Enveloped Dwellings (ATED)
A decision framework by portfolio size

Why Section 24 Is Making Landlords Look Again at Incorporation

The restriction of mortgage interest relief, known as Section 24, means that individual landlords paying higher-rate income tax at 40% are now taxed on their gross rental receipts, not on their net profit after financing costs. Where mortgage interest once reduced taxable income directly, it now produces only a 20% basic-rate tax credit. For a higher-rate taxpayer with a heavily mortgaged portfolio, this can push the effective tax rate on marginal rental income well above 40%.

A limited company is not subject to Section 24. It pays corporation tax on its net profits after deducting mortgage interest and other allowable expenses. At the small profits corporation tax rate of 19% (applicable to profits up to £50,000), the contrast with personal income tax rates is striking.

This structural difference is the engine driving interest in limited company buy-to-let. The question is not whether the tax saving exists, but whether it is large enough to outweigh the costs of getting there.

The Tax Advantages of a Limited Company Buy-to-Let Structure

A property limited company offers several tax advantages over personal ownership, and understanding each one is central to any landlord incorporation guide UK.

Corporation tax on profits. Companies pay corporation tax on net profits. The small profits rate is 19% on profits up to £50,000. The main rate is 25% on profits above £250,000, with marginal relief applying between the two thresholds. Even at the main rate, the headline tax rate compares favourably with higher-rate personal income tax at 40% or the additional rate at 45%.

Full deductibility of mortgage interest. Unlike individual landlords subject to Section 24, a limited company deducts finance costs in full before calculating its taxable profits. This is the single most valuable structural advantage for leveraged landlords.

Profit retention. Profits left inside the company are taxed only at corporation tax rates. You pay personal tax only when you extract money as salary or dividends. This makes a company structure particularly efficient for landlords who intend to reinvest rental profits into further acquisitions rather than drawing income immediately.

Tax-efficient extraction. For 2026/27, dividends are taxed at 10.75% (basic rate), 35.75% (upper rate), and 39.35% (additional rate), with a £500 dividend allowance. A director-shareholder who combines a modest salary with dividends can often extract income more tax-efficiently than a sole trader drawing equivalent sums.

Estate planning. Shares in a property company can be structured to admit family members, transferred by way of gift, or held in trust, offering flexibility that outright property ownership does not.

Worked example. Two buy-to-let properties generate £32,000 in rental income. After deducting allowable expenses other than mortgage interest, the net figure is £28,000. Annual mortgage interest is £10,000. As an individual higher-rate taxpayer, you pay 40% tax on the full £28,000 (£11,200), then claim a 20% tax credit on the interest (£2,000), leaving a personal tax bill of £9,200. Inside a limited company, the company pays corporation tax on £18,000 of net profit (£28,000 minus £10,000), giving a corporation tax charge of £3,420 at 19%. The annual tax saving in this simplified example is £5,780.

SDLT and CGT: The Real Costs of Transferring Existing Properties

This is where the property company incorporation landlord conversation often becomes uncomfortable. Transferring properties you already own into a newly formed limited company is treated for tax purposes as a disposal at full market value, regardless of what consideration you actually receive.

Stamp Duty Land Tax. The company acquiring the properties pays SDLT at the higher rates for additional dwellings, which since October 2024 carry a 5% surcharge on top of standard residential rates. On a £350,000 property transferred in 2026/27, the SDLT calculation would be: 5% on the nil-rate band to £125,000 (£6,250), 7% on the next £125,000 (£8,750), and 10% on the remaining £100,000 (£10,000), producing a total SDLT liability of £25,000.

In addition, where a company acquires a single residential dwelling valued above £500,000, a flat 15% SDLT charge can apply. A letting relief exists for companies that genuinely let the property on a commercial basis to unconnected third parties, but this exception needs to be properly structured and documented.

Capital Gains Tax. You are treated as disposing of each property at its current market value, which crystallises a CGT liability if the properties have risen in value since you acquired them. CGT rates on residential property for 2026/27 are 18% for basic-rate taxpayers and 24% for higher-rate taxpayers.

Incorporation relief under s162 TCGA 1992 can, in principle, defer CGT by rolling the gain into the base cost of the shares you receive in exchange. However, HMRC's position is that most residential letting activities do not qualify as a "business" for these purposes. The relief is more readily available where landlords provide additional services to tenants or manage the portfolio on a clearly commercial footing. Professional advice is essential before relying on this route.

These upfront costs mean that incorporating an existing portfolio only tends to make financial sense when the ongoing annual tax savings are large enough to recover the initial outlay within a reasonable timeframe, typically five to ten years depending on the portfolio.

Mortgage Lending and Lender Restrictions

Existing residential buy-to-let mortgages are issued to individual borrowers in their personal names. When a property transfers to a limited company, the existing mortgage either needs to be redeemed in full or the lender must formally consent to the transfer of the borrowing.

Most residential buy-to-let lenders will not simply permit the transfer of an existing mortgage to a company. In practice, this usually means redeeming the existing loan and taking out a new limited company buy-to-let mortgage. Limited company mortgages tend to attract higher interest rates and arrangement fees than personal mortgages, reflecting the additional complexity for lenders.

If you hold fixed-rate products with early repayment charges, the cost of breaking those agreements can add significantly to the overall cost of incorporation. A specialist buy-to-let mortgage broker should be consulted alongside your accountant before any decision is made. Tax advice in isolation, without understanding the financing picture, can paint an incomplete picture.

Annual Tax on Enveloped Dwellings

Where a company owns residential property in the UK, the Annual Tax on Enveloped Dwellings (ATED) regime may apply. ATED is an annual charge on companies that hold single residential dwellings valued above £500,000.

For 2026/27, ATED charges range from £4,400 per year on properties valued between £500,000 and £1 million, rising through several bands to £269,450 per year for properties above £20 million. The charge is indexed annually in line with CPI.

A property rental relief applies where the property is let to a third party on a commercial, arm's length basis. Most landlords holding property in a company for genuine letting purposes will qualify for this relief and pay no ATED. However, an ATED return must still be filed with HMRC each year even where the relief reduces the charge to nil. Missing returns can attract penalties.

A Decision Framework for Different Portfolio Sizes

There is no universal answer to whether property company incorporation is right for a given landlord. The following framework provides a starting point, but every case requires individual analysis.

One to three properties. For smaller portfolios, the upfront SDLT and CGT costs of transferring existing properties are often difficult to recover through ongoing tax savings within a commercially realistic timeframe. The exception is where properties are bought outright or have minimal unrealised gains. For future acquisitions, buying through a company from the outset avoids transfer costs entirely and may be the more efficient path.

Four to ten properties. At this scale, the Section 24 impact on higher-rate taxpayers is usually significant, and the annual tax savings can justify the upfront investment in a company structure, particularly where the portfolio is heavily mortgaged. A formal break-even analysis comparing total upfront costs against projected annual savings should always be prepared by a qualified adviser before proceeding.

Ten or more properties. For larger portfolios, the ongoing tax advantages are typically decisive. A company structure also offers better protection against personal creditor claims, greater flexibility for succession planning, and the ability to admit partners or family members as shareholders without triggering a disposal.

Alongside portfolio size, your age and timeline matter. If you plan to sell in five years, incorporation costs look very different than if you are building a portfolio to fund a thirty-year retirement.

How Blue Tick Can Help

Property company incorporation is one of the most consequential decisions a landlord will face, and the numbers look very different depending on the size, structure, and financing of each individual portfolio. Blue Tick specialises in property tax planning for UK landlords and provides detailed financial modelling of the SDLT exposure, CGT implications, and projected annual tax savings across five and ten-year horizons, so you can make an informed decision rather than one based on general principles. Head to our website and book a meeting now.

Property company incorporation offers real and significant tax advantages for many landlords, particularly higher-rate taxpayers with growing or leveraged portfolios. The savings arise from full mortgage interest deductibility, lower corporation tax rates, and more flexible income extraction. But those savings must be weighed against the very real costs of SDLT and CGT on transfer, higher mortgage rates in a company name, and ongoing compliance obligations. For new acquisitions, the limited company route is increasingly the default choice for serious landlords. For existing portfolios, the numbers need to be modelled carefully before taking action.

This article is intended for general informational purposes only and does not constitute tax, legal, or financial advice. Tax rules are subject to change and their application will depend on your individual circumstances. You should always seek advice from a qualified professional before taking action. Blue Tick Accountants accepts no liability for decisions made on the basis of this content.