Section 24 Survival Guide: How the 20% Tax Credit Really Affects Higher-Rate Landlords

Have you looked at your tax bill since Section 24 was fully implemented and wondered where your rental profit has gone? You’re not alone. Many landlords are seeing their tax liabilities soar, even when their rents and mortgage costs have remained stable. Before these changes, the formula was simple: rental income minus all costs (including mortgage interest) equalled taxable profit. It was a clear and logical system that treated property investment like any other business.

The introduction of Section 24 by HMRC turned this on its head. The ability to deduct finance costs was replaced by a basic rate tax credit of 20%. While this sounds like a straightforward swap, the underlying mechanics are profoundly different and far more punitive, especially for higher-rate taxpayers. The core issue is that your taxable income is now artificially inflated, creating what many call a “phantom profit”—money you never see but are taxed on nonetheless.

But if the core problem is a fundamental rewiring of tax calculations, the solution must go beyond simple cost-cutting. The key is no longer just about what property you own, but how you own it. This guide will deconstruct the Section 24 tax trap in plain English. We will walk through the precise calculation that pushes landlords into higher tax brackets, explore the structural levers you can pull to regain control, and provide the tools to assess the true profitability of your portfolio in this new landscape.

This article provides a detailed breakdown of the challenges and strategic solutions available to landlords under Section 24. Explore the contents below to navigate to the section most relevant to your current situation.

The tax trap calculator: Will your rental profit push you into a higher tax bracket?

The most dangerous aspect of Section 24 is its ability to create “phantom profit.” Because you can no longer deduct your mortgage interest as an expense, it is added back to your rental income to determine your taxable turnover. This inflated figure is then added to your other earnings (like a salary), which can easily push you over the threshold into the 40% or 45% tax band, even if your actual cash-in-hand profit hasn’t changed.

Consider this real-world example. A landlord named Fred, who earns £42,000 from his job, has a property generating £20,000 in rent with £9,000 in mortgage interest. Before Section 24, his taxable rental profit was £11,000 (£20k rent – £9k interest). Now, his taxable rental income is the full £20,000. This pushes his total declared income to £62,000, tipping a significant portion into the 40% tax band. Despite only making a real profit of £6,000 after all costs, he pays £1,800 more in tax annually. He is being taxed on money that went directly to the bank.

This is the tax trap in action. The 20% credit on his £9,000 interest (£1,800) does not compensate for the fact that a large chunk of his income is now being taxed at 40% instead of 20%. The impact can be severe, with some landlords seeing an effective tax rate of over 100% on their real profits. For many, this could mean the difference between a profitable investment and one that loses money each year, with research showing this can lead to an additional annual tax bill of around £2,400 for affected landlords.

Beneficial Interest Company Trust: Can you move properties to a company without refinancing?

For landlords trapped by Section 24, moving properties into a limited company is often touted as the primary solution. However, this typically requires repaying personal mortgages and securing new, often more expensive, corporate financing, triggering both early repayment charges and Capital Gains Tax (CGT). The Beneficial Interest Company Trust (BICT) offers a complex but potential alternative to this problem.

This legal arrangement works by separating the ownership of a property into two parts: the ‘legal title’ (the name on the Land Registry and the mortgage) and the ‘beneficial interest’ (the right to receive the rental income and capital growth). With a BICT, the landlord retains the legal title and the personal mortgage, avoiding refinancing. The beneficial interest, however, is transferred to a limited company.

This means the rental income flows directly into the company, which can then deduct 100% of the finance costs as a business expense before calculating its Corporation Tax liability. This effectively bypasses the Section 24 restrictions that apply to individuals. This structure is best explained by the experts:

A Beneficial Interest Company Trust (BICT) allows the landlord to move the economic value of the property into a company whilst retaining the legal title of the property and, thus, the mortgage in their personal name.

– Mortgages for Business, Beneficial Interest Company Trusts guidance article

However, this is a highly specialist area. It requires expert legal and tax advice, and not all mortgage lenders permit such arrangements. It is a powerful example of the “structural efficiency” required to navigate the modern property tax landscape, but it is not a simple or universally applicable fix.

Form 17:Freehold vs Leasehold: What are the real ownership risks of buying a leasehold house?

While the title mentions ownership risks, the core tool discussed here, Form 17, is actually about optimising tax between joint owners, typically a married couple. If you own property with your spouse or civil partner, HMRC’s default assumption is that you split the rental income—and the tax liability—50/50. However, if one partner is a basic-rate taxpayer and the other is a higher-rate taxpayer, this is rarely the most efficient arrangement.

This is where Form 17 comes in. It is a declaration made to HMRC that allows you to be taxed on rental income based on your actual, unequal shares of beneficial ownership in the property. For example, if the lower-earning spouse put in 80% of the deposit and the higher-earning spouse put in 20%, you can declare this split to HMRC. The result? 80% of the rental profit is taxed at the lower earner’s basic rate (20%), and only 20% is taxed at the higher rate (40%).

This is a perfectly legal and effective way to mitigate the impact of Section 24 for partners in different tax bands. However, it cannot be based on a whim. You must have legally sound proof that the beneficial ownership is genuinely unequal. Attempting to do this without the proper legal groundwork is a red flag for HMRC.

Are arrangement fees and broker fees still deductible under the new rules?

A common point of confusion for landlords is the treatment of fees associated with obtaining finance. With mortgage interest being the focus of Section 24, what happens to the upfront costs like mortgage arrangement fees, broker fees, and valuation fees? The answer lies in a critical tax distinction: Capital vs. Revenue expenditure.

Under the new rules for individual landlords, fees incurred to create a new asset or loan (i.e., for a new property purchase) are generally classified as capital costs. This means they are NOT deductible from your rental income as an allowable expense. This includes the mortgage arrangement fee, broker fees for the purchase mortgage, and legal fees associated with the loan. Instead, these costs can be offset against your Capital Gains Tax bill when you eventually sell the property.

Conversely, fees for maintaining or renewing an existing loan, such as an annual mortgage account fee or potentially a broker fee for a straightforward remortgage (without increasing the loan amount), may be treated as revenue costs and remain deductible against rental income. The table below, based on guidance from tax professionals, clarifies this distinction.

This is another area where structural efficiency comes into play. As chartered accountants often point out, the rules can be more favourable within a corporate structure.

The treatment of these fees is often more favourable for a Limited Company, where they are typically treated as a standard cost of doing business and are fully deductible against the company’s profits.

– Jones Robinson Chartered Accountants, Section 24 Guide for Landlords 2026

FHL advantage: Why mortgage interest is still 100% deductible for Furnished Holiday Lets?

For years, one of the most effective strategies to legally bypass Section 24 was to operate properties as Furnished Holiday Lets (FHLs). For tax purposes, HMRC classifies FHLs not as property investments but as trading businesses. This single distinction unlocked a host of tax advantages, the most significant being that FHLs were exempt from the Section 24 mortgage interest restrictions. Owners could continue to deduct 100% of their finance costs against rental income.

This created a two-tier system where a landlord with a standard buy-to-let might be losing money after tax, while a neighbour with an identical property run as an FHL could be highly profitable. To qualify, properties had to meet strict criteria regarding availability and actual letting days, reinforcing their status as an active business rather than a passive investment. The FHL sector, though a small part of the overall rental market, has been a significant one, with HMRC statistics revealing that in 2023-2024 FHLs generated £2.43 billion in income, representing 4% of the UK rental market.

However, this tax advantage is coming to an end. In a major policy shift announced in the Spring Budget 2024, the government is abolishing the FHL regime. As a result, from 6 April 2025, mortgage interest relief for Holiday let owners will face the same Section 24 restrictions as residential landlords. This removes one of the last major structural loopholes available to individual property investors.

How to calculate your real Return on Capital Employed (ROCE) after Section 24 taxes?

In the post-Section 24 world, traditional methods of calculating property profit are not just outdated; they are dangerously misleading. Continuing to think in terms of “rent minus costs” will hide the true tax impact and could lead you to hold onto loss-making assets. The only way to get a true picture of your portfolio’s health is to calculate your real, after-tax Return on Capital Employed (ROCE). While official data shows average income per unincorporated landlord in 2023-24 was £19,400, this gross figure masks the sharply declining net profit for many.

ROCE measures how efficiently your own capital (your deposit and equity) is working for you. A high ROCE indicates a healthy, profitable investment. A low or negative ROCE is a clear signal that your capital could be better deployed elsewhere. Calculating it correctly requires incorporating the full, complex impact of the Section 24 tax credit system.

Here is a step-by-step process to calculate your real ROCE. This is not a simple back-of-the-envelope calculation; it requires a detailed look at your specific numbers, but it is the most important calculation for any landlord today.

1. Calculate Gross Rental Income: The total rent received over the year.
2. Calculate Taxable Rental Profit: Deduct all allowable expenses (e.g., insurance, maintenance, agent fees) but EXCLUDE all mortgage interest.
3. Determine Total Taxable Income: Add this taxable rental profit to all your other income (e.g., salary, pension) to find your total income and which tax band you fall into.
4. Calculate Initial Tax Liability: Apply the correct income tax rates (20%, 40%, 45%) to your total taxable income.
5. Apply the Tax Credit: Calculate your 20% tax credit (Total annual mortgage interest × 0.20) and subtract this from your initial tax liability. This gives you your final tax bill.
6. Calculate Real ROCE: Use the formula: (Annual Rent – All Deductible Costs – Calculated Tax) ÷ (Property Value – Mortgage Balance) × 100. This is your true return.

Why do lenders offer more generous ICR calculations to Limited Companies?

When considering a move to a limited company structure, landlords often focus on the Corporation Tax benefits. However, a powerful secondary advantage lies in mortgage lending: limited companies can often borrow more money on the same property than a personal applicant. This is due to the different way lenders calculate the Interest Coverage Ratio (ICR).

The ICR is a stress test used by lenders to ensure the rental income can comfortably cover the mortgage payments, even if interest rates rise. For personal buy-to-let mortgages, lenders must factor in the landlord’s personal tax situation, including the punitive effects of Section 24. They typically require a higher ICR (e.g., 145%) and stress test it at a notional interest rate, assuming the landlord is a higher-rate taxpayer. This reduces borrowing capacity.

For a limited company, the calculation is much simpler. The company’s tax affairs are separate. Lenders can see that 100% of the mortgage interest is deductible before tax, resulting in a healthier, more predictable cash flow to service the debt. Consequently, they can offer a lower ICR (e.g., 125%) and assess profitability based on the lower Corporation Tax rate. This “ICR discrepancy” directly translates into higher borrowing potential, as the table below illustrates.

Limited Company or Personal Name: How should you structure your buy-to-let capital?

The final, overarching question for any landlord impacted by Section 24 is whether to transition their portfolio into a limited company. The data shows a clear trend: according to Hamptons research, there has been a 332% increase in buy-to-let companies since 2016, with the number expected to top 400,000. This mass migration is driven almost entirely by the tax efficiency of the corporate structure.

Within a limited company, all finance costs are fully deductible against income before tax is calculated. Profits are then subject to Corporation Tax (currently 19-25%), which is significantly lower than the 40% or 45% income tax rates many landlords are being pushed into. This makes profitability far more predictable and manageable. Furthermore, a company structure offers greater flexibility for succession and inheritance tax planning.

However, this is not a one-size-fits-all solution. Running a limited company introduces higher costs and complexity. Accountancy fees are more expensive than a personal self-assessment, and as we’ve seen, mortgage products for companies typically carry higher interest rates. There’s also the issue of extracting profit: you can’t just take the money out. You must pay yourself a salary or dividends, which are subject to further personal taxation. The decision requires a holistic view of the entire property lifecycle.

Ultimately, the “right” choice is deeply personal and depends entirely on your individual circumstances. As the financial experts at Pinpoint Finance wisely conclude:

The right choice depends on a client’s tax position, investment horizon, and estate planning needs. It’s not all one way. Buying in your personal name still makes sense for plenty of landlords.

– Pinpoint Finance, Personal Name or Limited Company Buy to Let Guide

Now that you understand the mechanics, the next logical step is to apply this knowledge. Start by recalculating your portfolio’s real Return on Capital Employed using the method outlined in this guide to make informed, strategic decisions about your future as a landlord.