Many UK landlords are exploring the idea of holding their buy-to-let properties in a limited company structure. This trend has accelerated in recent years as tax reforms have made traditional personal ownership less profitable for higher-rate taxpayers. By incorporating a property portfolio, investors can potentially reduce their tax bills, take advantage of business tax treatment, and plan more effectively for the future. Below, we outline the key tax advantages of operating through a limited company – from lower tax rates on rental profits to full mortgage interest relief, inheritance tax planning, and deferring personal taxes. We also highlight some important drawbacks (like added costs and Stamp Duty) that need to be weighed in any decision.

Lower Corporation Tax on Rental Profits

One of the main reasons landlords incorporate is to pay Corporation Tax on rental profits instead of Income Tax. Rental income received by an individual is added to their other income and taxed at their marginal income tax rate (which for higher earners is 40% or even 45%). In contrast, profits in a company are subject to Corporation Tax – currently 19% for small profits, up to 25% for larger profits (as of April 2023). Even at the new 25% rate, this can be significantly lower than personal tax rates for many landlords. For example, a higher-rate taxpayer with £20,000 of annual rental profit would face around £8,000 of Income Tax, whereas a company paying the small profits rate might owe just ~£3,800 in Corporation Tax – leaving much more after-tax profit to reinvest. Put simply, paying 19–25% Corporation Tax instead of 40–45% Income Tax can dramatically lessen a landlord’s tax bill. This is especially beneficial if you’re already in a high tax bracket or if the rental profits push you into one.

It’s important to note that the tax advantage exists at the company level. If you want to draw the profits out for personal use, you’ll then pay personal tax (for example, dividend tax) on those withdrawals. We’ll discuss this more under “retained profits,” but the key idea is that keeping profits inside the company is taxed more lightly up front than taking them personally. In summary, operating via a company converts rental income into corporate profits, taxable at generally lower rates than personal income – a fundamental tax saving for many property investors.

Full Mortgage Interest Deductibility

Another major driver for incorporation is the mortgage interest relief treatment. In recent years, individual landlords have lost the ability to fully deduct mortgage interest from their rental income. Under Section 24 rules (phased in from 2017), individual buy-to-let owners can only claim a basic-rate tax credit (20%) on their finance interest, rather than deducting it as an expense. This means higher-rate taxpayers effectively pay tax on part of their mortgage interest, significantly increasing their tax bills on geared properties. For example, an individual landlord paying £10,000 in mortgage interest annually only gets a £2,000 tax credit now, even if they are in the 40% tax band (whereas prior to Section 24 they would have deducted the £10k and saved £4,000 in tax). This change has turned many geared portfolios barely profitable or even loss-making on a post-tax basis for higher-rate landlords.

Limited companies are not subject to Section 24. When you hold property in a company, the mortgage interest is treated as a business expense – it can be deducted in full against rental income before calculating taxable profit. The company’s tax bill is thus based on net profit after interest, just like any other business. All the interest costs provide tax relief at the Corporation Tax rate. In practice, this restores the old tax treatment: the full mortgage interest offset can result in substantial tax savings for highly leveraged investors. For instance, if your rental property earns £15,000 in rent and has £10,000 in mortgage interest, an individual higher-rate landlord would still be taxed on the full £15,000 (with only a £2k credit), whereas a company landlord is taxed only on the £5,000 net profit – a far smaller taxable base.

This difference is a key reason 69% of landlords plan to buy new rental properties via limited companies. By using a company, landlords can maintain interest as a deductible expense and avoid the punitive effective tax rates that Section 24 created for personally owned properties. In short, incorporation can preserve interest relief and keep your financing costs fully tax-deductible – critical for those with mortgages on their rentals.

Inheritance Tax Planning via Company Structures

Using a company can also open up inheritance tax (IHT) planning opportunities for landlords who want to pass their property wealth to the next generation. If you own properties personally, it can be complicated and costly (in terms of IHT and Capital Gains Tax) to transfer bits of property to your children or other heirs during your lifetime. However, with a company, you have much more flexibility in transferring ownership gradually by way of shares. You can bring family members in as shareholders or directors, and gift or sell shares in the company over time, rather than having to slice up the property titles themselves. Small transfers of shares can potentially be done within annual gift allowances or via trust planning, helping to reduce the taxable value of your estate bit by bit.

More sophisticated planning is also possible. Many advisers use Family Investment Companies with special share classes (sometimes called “freezer shares”) to control how future growth in the company is allocated between generations. For example, parents can retain a class of shares that hold the current value of the portfolio, and issue a new class of shares to their children that will accrue all future growth in value. This effectively “freezes” the parents’ estate at today’s value for IHT purposes, while any appreciation in the property portfolio from this point forward happens in the children’s shares. As a result, if the properties continue to grow in value, that growth can bypass the parents’ estate (and thus avoid inheritance tax) and belong to the next generation. Crucially, when set up correctly, this does not trigger immediate tax – the new shares have only nominal value initially, so parents aren’t making a taxable transfer of substantial value at the time of structuring.

It should be noted that standard buy-to-let companies are usually considered investment companies for tax purposes, which currently do not qualify for Business Property Relief (BPR) – a relief that can make certain business assets IHT-free after two years. (BPR is generally available for trading businesses, not passive investment portfolios.) However, with careful planning, some landlords restructure activities to become more active property businesses (e.g. development or holiday lets) or use the share structuring techniques mentioned above to mitigate IHT. In any case, holding properties in a company gives greater flexibility to plan for inheritance, allowing strategies like gifting shares, issuing growth shares, or using trusts. This can substantially reduce the inheritance tax eventually due on the portfolio, compared to simply holding properties until death and leaving them in a will with a 40% IHT exposure. Given that property values often far exceed the IHT nil-rate bands, this kind of planning can save heirs a significant tax bill in the long run.

Retaining Profits and Deferring Personal Tax

A less immediate but powerful benefit of a company structure is the ability to retain profits within the company, deferring any personal tax liability. If you own properties personally, any profit (after expenses) is yours – which also means it gets taxed as part of your personal income each year. But within a company, you have a choice: you can pay out profits to yourself (as salary or dividends) or you can simply leave the profits in the company to reinvest or pay down debt. The profits that are retained in the company only suffer Corporation Tax in that year. No further tax is due until you decide to extract the money for personal use. This creates a valuable tax-deferral advantage.

For example, suppose your property company makes £50,000 in profit this year. The company will pay, say, 19% Corporation Tax (if within the small profits limit), leaving about £40,500 after tax. If you don’t need that money personally right away, you can reinvest the £40k into buying another property or improving existing ones. No personal tax is triggered because you haven’t taken a dividend or salary from those profits. In contrast, if you owned the portfolio personally and earned £50,000 net profit, you’d pay income tax on it in the same tax year – possibly £20,000 (40%) if you’re a higher-rate taxpayer – leaving you only £30k to reinvest. Over time, this ability to reinvest a larger portion of your earnings (since only the lower corporate tax is taken out) can accelerate the growth of your portfolio.

Another way to view this is that a company lets you time your personal tax events for when it’s most efficient. You might choose to take dividends in years when your other income is low, or spread dividends over time to stay in lower tax bands. Or you might retain profits until retirement, using them to fund a future income when you stop other work. There is also the possibility of extracting some profit as a modest salary (which can be set to use your personal allowance tax-free) and some as dividends, achieving a tax-efficient mix. The key point is flexibility – a company gives you much more control over when and how you take income, allowing you to defer or minimize personal taxes in a way an individual landlord cannot.

Of course, whenever you do draw the profits out, you’ll pay personal tax at that point (dividend taxes, which are currently 8.5% basic rate, 33.75% upper rate, etc., after a small allowance). This means incorporation isn’t about avoiding personal tax altogether, but about delaying it and potentially reducing it. For many investors, the strategy is to use retained earnings for growth and only take out what they need when they need it – thereby maximising the funds kept in the low-tax company environment. This can be especially useful if your goal is to build a larger portfolio for the long term, or if you already have other income and don’t require the rental profits immediately.

Potential Drawbacks of Incorporating

Incorporating a property portfolio isn’t a one-way ticket to tax savings; it comes with its own costs and complications. It’s crucial to weigh these drawbacks against the benefits discussed above. Here are some key considerations to keep in mind before you rush to set up a property company:

• Upfront Transfer Costs (Stamp Duty and CGT): If you are moving existing properties from personal ownership into a new company, it isn’t as simple as “re-registering” them – you typically have to “sell” the properties to your company at market value. This can trigger Stamp Duty Land Tax (SDLT) on the transfer, as well as potential Capital Gains Tax (CGT) on any increase in value of the properties. The company will pay SDLT just like any buyer (including the 5% additional rate), and you, as the seller, could face CGT on the gain (18% or 28% for residential property, depending on your tax band). There are some reliefs available – for instance, Incorporation Relief under certain conditions – but many landlords find that incorporating an existing portfolio can come with a hefty upfront tax bill. It’s essential to calculate these costs to see if the long-term tax savings justify the immediate hit.
• Ongoing Compliance and Administration: Running a limited company means more paperwork and expense. You’ll need to file annual accounts and confirmation statements at Companies House, submit Corporation Tax returns to HMRC, keep proper company books, and likely pay an accountant to ensure all this is done correctly. If you pay yourself a salary or take dividends, there are additional reporting requirements (PAYE payroll filings, dividend documentation, etc.). In short, the administrative burden is higher than just declaring rental income on a personal Self-Assessment. These compliance costs will eat into the financial benefits of incorporation. Landlords should factor in accountancy fees and the value of their time. For a single property or small portfolio, the savings may not outweigh these extra costs – incorporation tends to make more sense as the portfolio (and the tax saving) grows larger.
• Double Tax when Extracting Profits: As discussed, while profits inside the company are taxed at a lower rate, when you take money out for personal use you’ll face personal tax. Typically this is via dividends (since most buy-to-let company owners don’t put themselves on a large salary). Dividend tax rates are lower than income tax rates, but they still apply. For example, after the first £500 of dividends (2024–25 allowance), a basic-rate taxpayer pays 8.5% and a higher-rate taxpayer 33.75%. This second layer of tax can reduce the overall advantage, especially if you withdraw most of the profits each year. In a scenario where a landlord wants to live off the rental income fully, the combined Corporation Tax + Dividend Tax might not be much better than simply paying Income Tax personally. The benefit is greatest when you reinvest or hold profits in the company. If you need all the cash out, the benefit shrinks (though you could still gain some advantage up to the basic-rate band, etc.). It’s important to plan distributions carefully. In other words, the “tax deferral” only helps if you actually defer taking the income; otherwise, you end up with two layers of tax. (On the plus side, if you plan to eventually sell the company or its properties, having paid down debt with retained profits, you might take profits via a capital route or at a time when tax rates are different. It adds strategic options, but requires foresight.)
• Mortgage Availability and Costs: Many landlords don’t realize that getting a mortgage through a company can be a bit more involved. Fewer lenders cater to limited company buy-to-lets (often these are considered Special Purpose Vehicles (SPVs)), and interest rates can be slightly higher to account for perceived additional risk. Lenders will almost always require personal guarantees from the directors/shareholders for small property companies, effectively tying your personal liability to the debt anyway. You might also find arrangement fees higher or loan-to-value ratios slightly lower. This isn’t a tax issue per se, but it does affect the overall profitability of the investment. It’s worth checking with mortgage brokers what rates/terms your company could get versus personal mortgages. With interest rates currently higher than they’ve been in recent years, even a small rate difference can outweigh some tax savings. Always factor in financing costs under a company structure.
• Loss of Personal Allowances/Reliefs: Holding property in a company means you personally no longer get certain perks. For instance, individuals each have a Capital Gains Tax annual exemption (£3,000 for 2024–25) that can be used against property sales – companies do not get this; every pound of gain is taxed. Likewise, if you have any personal rental losses carried forward, those can’t be used by the company. A company also doesn’t benefit from your personal tax-free allowance (though you could use that via a salary). These trade-offs are usually minor compared to the big-ticket items above, but they are part of the picture. If you anticipate selling properties, remember a company’s sale profits are taxed at Corporation Tax rates (which could be higher than the 18% basic-rate CGT for individuals, for example).

In summary, incorporation has pros and cons. The tax benefits – lower tax on profits, full interest deductibility, potential IHT advantages, and flexibility of profit withdrawal – need to be balanced against the costs and practicalities – immediate taxes on transferring in, ongoing administrative costs, double taxation on extraction, and financing considerations. For some landlords (especially higher-rate taxpayers with multiple properties they plan to hold long-term), the scales tilt in favor of incorporation. For others (small-scale or basic-rate landlords, or those planning to sell in the short term), staying as an individual may be simpler and more cost-effective.

Conclusion

Choosing whether to hold your property investments through a limited company is a significant decision that should be evaluated case by case. This structured approach can offer substantial tax savings and planning flexibility for the right investor profile – particularly those looking to grow portfolios and pass on wealth efficiently. We’ve seen that lower corporate tax rates, unrestricted mortgage interest relief, and the ability to reinvest profits can make a compelling case for incorporation. Real-world scenarios bear this out: it’s no coincidence that the number of buy-to-let companies has surged fourfold since mortgage interest relief was curtailed for individuals. However, incorporation is not a one-size-fits-all solution. The compliance responsibilities, upfront costs (SDLT/CGT), and the need for careful profit extraction planning mean that professional advice is essential.

Often forming a company for new acquisitions (while leaving existing properties as they are) can be the best option.

Ultimately, operating via a limited company is a powerful tool in the landlord’s tax planning arsenal, but like any tool, it must be used in the right circumstances. By understanding the tax benefits – and the pitfalls – outlined above, property investors can make an informed choice about whether incorporation is the best route for their portfolio. As always, consult us first before making any decisions we can tailor the advice to your specific situation and help navigate the process if you decide to proceed. With the proper planning, incorporating your property business can be a savvy move that pays dividends (quite literally) in the years ahead.