If I'm considering investing in buy-to-let in 2026, how will the rumoured changes to Capital Gains Tax and Mortgage Interest Relief impact profitability for a higher-rate taxpayer, and are there specific ownership structures (e.g., limited company) that would be more beneficial?
Quick Answer
For higher-rate taxpayers, direct BTL ownership is less tax-efficient due to Section 24 and 24% CGT. A limited company allows full mortgage interest deduction and 19-25% Corporation Tax, potentially increasing profitability for 2026 BTL investments.
## Will Capital Gains Tax Changes Affect My Profitability?
From April 2026/27, higher/additional rate taxpayers will pay Capital Gains Tax (CGT) on residential property at a rate of 24%, a decrease from previous years but still a substantial proportion of profit. The annual exempt amount for CGT has also been reduced significantly to just £3,000. This means that for individual investors, a substantial portion of any capital appreciation will be subject to this tax upon sale.
For example, if an individual higher-rate taxpayer sells a buy-to-let property with a taxable gain of £100,000, after deducting the £3,000 annual exempt amount, £97,000 would be subject to CGT. At a 24% rate, this equates to a tax bill of £23,280. This increased tax liability directly impacts the net return on investment, making long-term capital growth potentially less attractive for individual owners.
## How Does Mortgage Interest Relief Impact Individual Landlords?
Since April 2020, individual landlords have been unable to deduct mortgage interest from their rental income before calculating their tax liability, a rule known as Section 24. Instead, they receive a basic rate tax credit equivalent to 20% of their finance costs. This significantly impacts higher and additional rate taxpayers, as their actual tax rate on rental income could be 42% or 47% from April 2027, but their mortgage interest relief is capped at 20%.
Consider a landlord with £15,000 in annual rental income and £10,000 in mortgage interest. Before Section 24, a higher-rate taxpayer would have paid tax on (£15,000 - £10,000) = £5,000, incurring a £2,100 tax bill at 42%. Now, they pay tax on the full £15,000, equating to £6,300, and then receive a £2,000 tax credit (20% of £10,000), resulting in a net tax bill of £4,300. This disparity means a substantial reduction in net cash flow for individual landlords with leveraged properties.
## Are Limited Company Structures More Beneficial?
Operating a buy-to-let portfolio through a limited company is often more tax-efficient for higher and additional rate taxpayers. Limited companies can still deduct 100% of their mortgage interest and other finance costs before Corporation Tax is applied. Corporation Tax rates are 19% for profits under £50k, 25% for profits over £250k, with marginal relief in between. This structure can significantly improve cash flow and overall profitability.
For instance, the same landlord with £15,000 income and £10,000 interest, if operating through a limited company, would pay Corporation Tax on £5,000. At the small profits rate of 19%, this is a tax bill of £950. This is a considerable saving compared to the £4,300 tax bill for an individual higher-rate taxpayer. Furthermore, profits retained within the company are not immediately subject to personal income tax, allowing for more efficient reinvestment. While extracting profits may incur personal tax, the timing and method of extraction can be managed strategically. It is also important to note that when a limited company sells a property, it pays Corporation Tax on the gain, not CGT, which can be another advantage depending on the company's profit levels and the shareholder's personal tax situation. HMRC guidance clarifies the different tax treatments for corporate vs. individual property ownership.
Steven's Take
The shift in tax policy, especially the 24% CGT for higher-rate taxpayers and the continued impact of Section 24, makes the limited company structure increasingly vital for profitability. I built my portfolio to £1.5M, and navigating these tax changes is not optional; it's a fundamental part of a successful investment strategy. The ability to deduct mortgage interest fully within a company versus only receiving a 20% tax credit as an individual can be the difference between a cash-flowing asset and a cash-draining one, particularly with the Bank of England base rate at 3.75% pushing up mortgage costs. This isn't about avoiding tax, it's about structuring your investments intelligently within the current regulatory framework.
What You Can Do Next
Consult a qualified property tax advisor – Seek professional advice on your specific financial situation and portfolio structure to determine the most tax-efficient ownership model, referring to the HMRC website for official guidance.
Model potential scenarios – Use a spreadsheet to calculate the net income and capital gains under both individual and limited company ownership, factoring in current tax rates and the £3,000 CGT allowance.
Review your current mortgage arrangements – Understand how your current interest rates (influenced by the 3.75% base rate) and terms interact with Section 24 and whether a limited company structure could lead to better financial outcomes.
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