Landlord Tax Guide 2026: Mortgage Interest, MTD, and What You Need to Know
- 1 day ago
- 5 min read
By Jessica
The UK property market is a cornerstone of many investment portfolios, but the tax landscape for landlords has undergone significant shifts in recent years. As we move through 2026, the rules surrounding mortgage interest relief and the way you report your income are changing. For many property owners, the 2026/27 tax year represents a major milestone due to the full rollout of Making Tax Digital (MTD) for Income Tax.
Staying compliant while remaining tax-efficient requires a clear understanding of Section 24 restrictions, digital record-keeping, and the structural differences between personal and corporate ownership. This guide breaks down exactly what you need to know to navigate landlord taxes in 2026 without the headache.
The Reality of Section 24: Mortgage Interest Relief in 2026
For nearly a decade, the "Section 24" rules have been a primary concern for individual landlords. In 2026, these rules remain firmly in place, and their impact is more significant than ever as interest rates and rental yields fluctuate.
How the Relief Works Now
In the past, landlords could deduct 100% of their mortgage interest from their rental income before paying tax. Today, that is no longer the case for individual landlords. Instead of a deduction, you receive a 20% tax credit on your finance costs.
What does this mean in practice? It means you pay tax on your gross profit (revenue minus general expenses like repairs and insurance), and only then do you get a reduction in your final tax bill equal to 20% of your mortgage interest.
Why This Hits Higher-Rate Taxpayers
If you are a basic-rate taxpayer, the 20% credit effectively offsets the 20% tax you would have paid on that portion of your income. However, if you are a higher-rate (40%) or additional-rate (45%) taxpayer, you are essentially paying the difference out of pocket. You are taxed at 40% or 45% on the income used to pay the mortgage, but you only get 20% relief back.
What Counts as a "Finance Cost"?
It isn't just the interest on your primary buy-to-let mortgage that qualifies for this 20% credit. Other eligible costs include:
Interest on loans used to improve or repair the rental property.
Fees for arranging or refinancing loans.
Interest on alternative finance (e.g., Sharia-compliant financing).
It is important to note that you cannot claim relief on the capital repayment portion of your mortgage: only the interest. Keeping clear, separate records of these payments is essential, especially with the new digital reporting requirements coming into play. If you're feeling overwhelmed by these calculations, it might be time to find an accountant who specialises in property tax.
Making Tax Digital (MTD) for Landlords: The 2026 Deadline
The biggest change hitting the sector this year is Making Tax Digital for Income Tax Self Assessment (MTD for ITSA). From 6 April 2026, the way you interact with HMRC changes forever if you meet certain income thresholds.
Are You Affected?
As of April 2026, MTD is mandatory for unincorporated landlords and sole traders with a combined gross income of over £50,000.
"Gross income" is the key phrase here. HMRC looks at your total turnover before any expenses are deducted. If your total rental income (plus any self-employment income) exceeds £50,000 in the 2024/25 tax year, you must comply with MTD from April 2026. If you're unsure where you stand, checking in with a self-assessment accountant can help clarify your obligations.
The New Reporting Schedule
Under MTD, the traditional once-a-year Self Assessment tax return is being replaced by a more frequent reporting cycle:
Digital Records: You must keep all your income and expense records in a digital format. Paper ledgers are no longer compliant.
Quarterly Updates: Every three months, you must send a summary of your income and expenses to HMRC using MTD-compatible software.
Final Declaration: By 31 January following the end of the tax year, you must submit a final declaration to confirm your total figures and claim any relevant reliefs.
The goal of MTD is to reduce errors and provide landlords with a more real-time view of their tax liabilities, but it requires a significant shift in how you manage your day-to-day admin.
Individual Ownership vs. Limited Companies
With Section 24 and MTD placing more pressure on individual landlords, many are asking: Is it time to move my properties into a limited company?
The Limited Company Advantage
The Section 24 mortgage interest restrictions do not apply to limited companies. If you hold your property within a company structure, mortgage interest is treated as a business expense and can be deducted in full from your rental income before you pay Corporation Tax.
Additionally, Corporation Tax rates are often lower than the higher-rate Income Tax brackets, which can lead to significant savings if you intend to reinvest your profits back into the business rather than drawing them out as personal income.
The Trade-offs
Moving properties into a company isn't a simple "quick fix." You may be liable for:
Stamp Duty Land Tax (SDLT): When you "sell" the property to your own company, SDLT is triggered.
Capital Gains Tax (CGT): The transfer is treated as a disposal, potentially triggering a CGT bill on the increase in property value.
Higher Mortgage Rates: Commercial or limited company mortgages often carry higher interest rates and fees than personal ones.
If you are considering this path, consulting a limited company accountant is vital to run a cost-benefit analysis based on your specific portfolio. This is especially important if your portfolio includes jointly owned property, where the rules can become more complex. For a closer look, read Joint Property and MTD: How Landlords Can Navigate the New Rules Together.
Planning for Tax Efficiency in 2026
Preparing for the 2026 tax year requires more than just knowing the rules; it requires proactive planning. Here are three steps every landlord should take:
1. Audit Your Digital Readiness
If you are still using a shoebox for your receipts, it's time to digitise. Look for HMRC-approved software that integrates with your bank accounts. This will automate much of the record-keeping required for MTD and make your quarterly updates a breeze. For more on income thresholds and who needs to comply, see MTD for Landlords: The £20,000 Threshold and What It Means for You.
2. Review Your Finance Structure
With interest rates still a significant factor, review your current mortgage deals. If your fixed term is coming to an end, factor in the Section 24 restrictions when calculating your net yield. Sometimes, paying a slightly higher interest rate for a deal with lower arrangement fees can be more tax-efficient, depending on your tax bracket.
3. Maximise Allowable Expenses
While mortgage interest relief is restricted, other expenses are still fully deductible. Ensure you are claiming for:
Property management and letting agent fees.
Insurance (Buildings, Contents, Rent Guarantee).
Maintenance and repairs (but not improvements/capital works).
Professional fees (Accountants, Surveyors, Solicitors for lease renewals).
Conclusion
The 2026/27 tax year brings a new level of complexity for UK landlords. From the ongoing impact of Section 24 to the rigorous new requirements of Making Tax Digital, the days of "casual" property investing are largely over. Success now depends on professional-grade record keeping and strategic tax planning.
At Accountant Search, we help property investors like you find the perfect tax partner to handle these complexities. Whether you need help setting up MTD-compliant software or want to explore the benefits of incorporation, we can match you with an expert who understands the property sector inside and out.
Don't wait until the April deadline to get your house in order. Explore our blog for more insights, including Accounting Services UK: The Complete Guide to Finding the Right Accountant for Your Business, or find an accountant today to ensure your property business remains profitable and compliant for years to come.
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