Can I still deduct all my mortgage interest from my rental income for tax purposes, or has Section 24 changed that, and how does it now impact my payable income tax?
Quick Answer
Section 24 has prevented individual landlords from deducting mortgage interest since April 2020, replacing it with a 20% basic rate tax credit, increasing income tax for higher earners.
## Understanding the Impact of Section 24 on Rental Income Tax
No, you cannot deduct all your mortgage interest from your rental income for tax purposes as an individual landlord in the UK. Since April 2020, Section 24 of the Finance (No. 2) Act 2015 fully phased out the ability for individual landlords to deduct finance costs, including mortgage interest, from their rental income before calculating profit. This change has a direct impact on taxable rental income and can significantly alter an investor's payable income tax, particularly for higher and additional rate taxpayers. Instead of a deduction, landlords now receive a basic rate tax reduction of 20% on their finance costs.
### How does Section 24 affect profit calculations?
Section 24 fundamentally changes how a landlord's profit is calculated for tax purposes. Previously, mortgage interest was treated as an allowable expense, reducing the taxable profit. For example, if rental income was £10,000 and mortgage interest was £4,000, taxable profit would be £6,000. Now, the full £10,000 is considered taxable income, with the 20% tax credit applied later. This means paper profits appear higher, pushing some landlords into higher tax brackets, even if their cash flow has not improved. A higher profit figure often leads to increased income tax liability, especially for individuals whose total income crosses the thresholds for higher or additional rate tax. Basic rate taxpayers (18% CGT, 20% income tax if not investing) are less impacted, as their tax liability is offset by the 20% credit.
### Which types of property owners are affected by Section 24?
Section 24 primarily affects individual landlords who own buy-to-let (BTL) properties in their personal name. Landlords holding properties within a limited company structure are exempt from Section 24. A limited company can still deduct all finance costs as a business expense, making it a more tax-efficient structure for some investors, particularly those with higher personal income. Corporation Tax currently sits at 25% for profits over £250k, with a small profits rate of 19% for profits under £50k, which is often more favourable than personal income tax rates for higher-earning landlords. Holiday lets that qualify as Furnished Holiday Lets (FHLs) also have different rules and can still deduct mortgage interest as a business expense, if they meet certain availability and letting conditions (available 140+ days/year AND let 70+ days).
### What are the real cost implications for investors?
The real cost implications for investors are substantial, particularly for higher and additional rate taxpayers. A higher rate taxpayer (paying 40% income tax) who previously saved 40% of their mortgage interest through deductions now only benefits from a 20% tax credit. For example, on £5,000 of annual mortgage interest, a landlord previously saved £2,000 in tax. Now, they receive a £1,000 tax credit. This represents an additional £1,000 in tax payable. This change effectively increases the landlord's overall tax burden and can significantly reduce net rental income and cash flow. For a property with £15,000 annual rent and £10,000 annual mortgage interest, a higher-rate taxpayer would see their taxable profit increase from £5,000 to £15,000, leading to a much higher tax bill than before.
## Section 24 & Landlord Profitability - Navigating Tax Changes
### Investing in Limited Company Structures
Many landlords have opted to operate their property portfolio through a limited company. This structure allows the company to continue deducting 100% of mortgage interest as a business expense, reducing the company's taxable profit. The company then pays Corporation Tax at rates of 19% (for profits below £50k) or 25% (for profits over £250k), which can be more advantageous than personal income tax rates for higher-earning individuals. This strategy also provides greater flexibility for re-investing profits. However, moving existing properties into a limited company can incur significant costs, including Stamp Duty Land Tax (SDLT) at the additional dwelling surcharge rate of 5% and Capital Gains Tax (CGT) on any accrued gains at 18% or 24% (depending on the landlord's tax band), making it less viable for older portfolios.
### Considering Furnished Holiday Lets
Properties meeting the criteria for a Furnished Holiday Let can still claim 100% of their mortgage interest as an allowable expense. To qualify, the property must be available for letting for at least 210 days in the tax year and actually let for at least 105 days in the tax year. This niche offers a potential alternative for some investors, but it comes with increased management responsibilities and market dependency. The tax benefits, including mortgage interest relief and potential for Capital Gains Tax relief, make it an attractive option for properties in suitable locations. However, these properties generally do not benefit from the same Council Tax exemptions as BTLs due to local authority discretionary premiums.
## Investor Rule of Thumb
Always understand your total tax liability, including the implications of Section 24, on your net rental income to avoid negative cash flow surprises. Your paper profit is not your cash profit for tax calculations.
## What This Means For You
The impact of Section 24 is one of the most significant changes to hit individual UK landlords in recent years. Understanding how this tax amendment specifically affects your personal finances and portfolio is crucial for long-term profitability. Most landlords who struggle with Section 24 do so because they haven't adequately modelled its full impact. At Property Legacy Education, we provide the tools and understanding to model such changes and make informed decisions on portfolio structuring.
Steven's Take
Section 24 fundamentally altered the game for individual landlords by removing the full mortgage interest deduction. I've seen too many investors, especially higher rate taxpayers, overlook the full cash flow impact until it's too late. It pushed many to consider limited company structures, but switching isn't free. The CGT and SDLT implications of transferring properties can be huge, particularly with the 5% additional dwelling surcharge for SDLT. For new acquisitions, running the numbers through a company structure is often the better route. For existing portfolios, you need to crunch every number to see if the tax savings outweigh the transfer costs. Furnished Holiday Lets are a niche, but for the right property, they offer an escape from Section 24. Don't assume anything; model everything.
What You Can Do Next
Review your current portfolio's income and mortgage interest figures: Calculate your actual taxable profit under Section 24 rules, applying the 20% basic rate tax credit to your mortgage interest. Use HMRC's website (gov.uk/guidance/income-tax-when-you-let-property-landlord-expenses-thats-deductible) to confirm allowable expenses.
Model your post-Section 24 tax liability: Calculate your income tax bill for your rental income, factoring in your total personal income and the 20% mortgage interest tax credit. This will show your true tax burden and help identify if you've been pushed into a higher tax bracket (e.g., higher rate at 40%, additional rate at 45%).
Consult a property tax specialist: Engage an accountant specialising in property tax (find one via ICAEW.com or ACCA Global) to discuss your specific circumstances, particularly if you are considering transferring properties to a limited company or exploring Furnished Holiday Let status. They can advise on the Stamp Duty Land Tax (SDLT) and Capital Gains Tax (CGT) consequences.
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