Understanding Section 24: Navigating Mortgage Interest Relief Restrictions for UK Landlords
Introduction to Section 24
For UK landlords, understanding the intricacies of tax legislation is crucial, and one of the most significant changes in recent years is Section 24 of the Finance (No. 2) Act 2015. This legislation has transformed how landlords can claim tax relief on mortgage interest payments, impacting profitability and financial planning.
Before diving into the specifics, it’s essential to grasp the core change: Section 24 restricts the ability of landlords to deduct mortgage interest costs from their rental income before calculating their tax liabilities. Instead, a basic rate tax reduction is applied. This shift has significant implications, especially for higher and additional rate taxpayers.

Historical Context and Implementation
Before the introduction of Section 24, landlords could deduct their entire mortgage interest payments from rental income, significantly reducing taxable income. This arrangement was beneficial, particularly for those in higher tax brackets. However, the government introduced Section 24 to level the playing field between landlords and homeowners, ensuring a fairer tax system.
The implementation was phased over four years, starting in April 2017. By the 2020/21 tax year, landlords were only eligible for a basic rate tax deduction on finance costs. This gradual rollout allowed landlords some time to adjust to the new system, though it still presented challenges for many.

Understanding the Financial Impact
For landlords, the financial impact of Section 24 can be significant. The restriction on mortgage interest relief means that taxable income may appear higher, potentially pushing some individuals into a higher tax bracket. As a result, landlords may face increased tax bills despite no actual increase in rental profits.
To illustrate, consider a landlord with a £10,000 annual mortgage interest payment. Under the previous system, this amount would be deducted entirely from rental income. Now, only a basic rate reduction is allowed, which can markedly increase the tax payable, particularly for those not in the basic rate tax band.

Strategies to Mitigate Effects
Landlords have been exploring various strategies to mitigate the effects of Section 24. Some have considered restructuring their portfolios, such as incorporating as a limited company, where mortgage interest remains fully deductible. However, this route can involve additional costs and complexities.
- Incorporation as a limited company
- Increasing rental income
- Exploring other deductible expenses
Each strategy carries its own set of considerations and potential pitfalls, making it essential for landlords to seek professional advice tailored to their specific circumstances.
Conclusion and Future Considerations
Understanding and navigating Section 24 is crucial for UK landlords aiming to maintain profitability in a changing tax landscape. While the restrictions on mortgage interest relief present challenges, informed planning and strategic decision-making can help mitigate negative impacts.
Landlords should closely monitor any future changes in tax legislation and remain adaptable, ensuring they are prepared for any new developments. Continual engagement with financial advisors and tax professionals will be key to navigating this complex environment successfully.