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Published: February 2026 | by Admin
Section 24 remains one of the most significant tax changes affecting UK landlords. Although the rule has been in place for several years, many landlords still underestimate its long-term impact on cash flow, tax liability, and borrowing capacity. In 2026, rising interest rates, higher operating costs, and tighter lending criteria have made Section 24 even more relevant.
This article explains how Section 24 works, who it applies to, and why careful planning is now essential for landlords who want to protect profitability and continue investing in residential property.
Section 24 is a UK tax rule that restricts mortgage interest relief for landlords who own residential property in their personal name. Before its introduction, landlords could deduct mortgage interest and finance costs from rental income before calculating taxable profit. Under Section 24, this deduction is no longer allowed. Instead, landlords receive a basic rate tax credit equal to 20% of the mortgage interest paid. This change increases taxable income without increasing actual profit, which is why many landlords experience higher tax bills despite no improvement in cash flow.
Section 24 applies to individual landlords and jointly owned residential buy-to-let properties held outside a limited company. It affects both small landlords with one property and larger portfolio holders.
The rule does not apply to properties owned through limited companies, commercial properties, or certain qualifying furnished holiday lets under current legislation. This distinction is critical, as ownership structure now directly affects tax efficiency. Many landlords only realise the impact after submitting their tax return, when restructuring options may already be limited.
The key issue with Section 24 is how taxable income is calculated. Mortgage interest is ignored when determining profit, which can push landlords into higher income tax bands. This may result in the loss of personal allowance, higher marginal tax rates, and child benefit clawback. In some cases, landlords are taxed on income that exceeds their actual cash profit.
The effect often extends beyond property tax and can influence personal finances, borrowing capacity, and long-term investment planning.
While Section 24 cannot be avoided, its impact can be managed with careful planning. Common strategies include using limited companies for future purchases, reviewing portfolio performance to improve yields, managing debt levels, and making pension contributions to control taxable income.
Ownership planning between spouses may also reduce overall tax exposure where appropriate. Each option carries tax and legal implications, so decisions should be based on individual circumstances and long-term goals rather than short-term tax savings.
In 2026, property investment remains viable, but tax efficiency is now essential. Landlords who plan structure, finance, and tax together are better positioned to maintain profitability and grow sustainably.
Section 24 has shifted the focus from gross rental income to net returns after tax. Ignoring its impact can significantly erode profits over time. Understanding how the rule works and taking proactive advice allows landlords to make informed decisions and continue investing with clarity and confidence.
Galaxy Financial supports landlords with specialist property tax advice, helping reduce unnecessary tax exposure and plan portfolios effectively. If you’re unsure how Section 24 affects your returns or future investments, speaking to a property-focused accountant can provide the clarity and confidence you need.