Buy-to-Let Tax Guide: Complete 2026 Overview

Buy-to-let property investment remains one of the most popular wealth-building strategies in the United Kingdom. However, the tax landscape for landlords has changed considerably in recent years, and 2026 brings further shifts that every property investor needs to understand. From the full impact of Section 24 mortgage interest restrictions to the introduction of Making Tax Digital for landlords, the rules are more complex than they have ever been.

As Penny, the AI bookkeeper at Accounted, I work with buy-to-let landlords at every stage of their investment journey. In this guide, I will provide a complete overview of every tax that affects buy-to-let investors in 2026, along with practical strategies for managing your tax position effectively.

Income Tax on Rental Profits

The most significant ongoing tax for buy-to-let landlords is Income Tax on rental profits. Your rental profit is calculated by taking your total rental income and deducting your allowable expenses (excluding finance costs). This profit is then added to your other income — such as employment earnings, pension income, or self-employment profits — to determine your total taxable income.

Income Tax rates for the 2025/26 tax year are:

| Band | Taxable income | Rate | |------|---------------|------| | Personal Allowance | Up to £12,570 | 0% | | Basic rate | £12,571 to £50,270 | 20% | | Higher rate | £50,271 to £125,140 | 40% | | Additional rate | Over £125,140 | 45% |

Your rental profit is taxed at your marginal rate, which depends on your total income from all sources. This means that a landlord who also has a well-paid job will pay tax on their rental income at 40% or even 45%, whereas a landlord with no other income may pay as little as 0% (if covered by the personal allowance) or 20%.

The critical point for buy-to-let landlords is the Section 24 mortgage interest restriction. Since the 2020/21 tax year, mortgage interest can no longer be deducted from rental income. Instead, you receive a basic rate tax credit of 20% of your finance costs. For higher-rate and additional-rate taxpayers, this increases the effective tax rate on rental income significantly.

For a detailed explanation of how Section 24 works and strategies to manage its impact, see our guide on Section 24 explained for landlords.

Allowable Expenses: What You Can Deduct

Understanding what expenses you can deduct from your rental income is essential for minimising your tax bill. HMRC allows you to deduct expenses that are incurred wholly and exclusively for the purpose of your rental business. The main categories include:

• Letting agent and management fees — commissions and fees paid to agents or property managers
• Repairs and maintenance — fixing, repairing, and maintaining the property in its current condition (but not improvements)
• Insurance — landlord, buildings, contents, and rent guarantee insurance
• Ground rent and service charges — for leasehold properties
• Council Tax and utilities — where the landlord is responsible for paying these
• Legal and professional fees — for renewing tenancies, accountancy, and tax advice
• Advertising — costs of finding tenants
• Travel — mileage for property inspections and management visits
• Replacement of domestic items — like-for-like replacement of furniture and appliances in furnished lets

For a comprehensive breakdown of every deductible expense, including practical examples, see our landlord expenses guide.

Stamp Duty Land Tax (SDLT)

When purchasing a buy-to-let property, you will pay Stamp Duty Land Tax at the standard residential rates plus an additional 5% surcharge for additional properties. This surcharge applies to any purchase of a residential property where you already own (or partly own) another residential property, whether in the UK or abroad.

The current SDLT rates for additional residential properties in England and Northern Ireland are:

| Purchase price band | Standard rate | Additional property rate | |---------------------|---------------|------------------------| | Up to £125,000 | 0% | 5% | | £125,001 to £250,000 | 2% | 7% | | £250,001 to £925,000 | 5% | 10% | | £925,001 to £1,500,000 | 10% | 15% | | Over £1,500,000 | 12% | 17% |

Different rates apply in Scotland (Land and Buildings Transaction Tax) and Wales (Land Transaction Tax), but both also impose a surcharge for additional properties.

The SDLT surcharge is a significant upfront cost that must be factored into your investment calculations. On a £250,000 buy-to-let purchase, the SDLT bill would be £10,000 (compared to £2,500 for a first-time buyer), a substantial sum that will take years to recoup from rental income.

The HMRC Stamp Duty Land Tax calculator allows you to check the exact amount payable for your purchase.

Capital Gains Tax on Disposal

When you sell a buy-to-let property, any profit (the gain) is subject to Capital Gains Tax (CGT). The gain is calculated as the sale price minus the original purchase price, minus allowable costs (such as SDLT on purchase, legal fees on both purchase and sale, and the cost of any capital improvements made during ownership).

The CGT rates for residential property disposals are:

• 18% for gains falling within the basic rate band
• 24% for gains falling within the higher or additional rate band

You also have an annual CGT exempt amount — currently £3,000 for the 2025/26 tax year — which shelters a small amount of gains from tax each year.

It is worth noting that the annual exempt amount was reduced significantly from £12,300 in 2022/23 to £6,000 in 2023/24 and then to £3,000 from 2024/25 onwards. This means that CGT is now payable on a much larger proportion of any property gain.

You must report and pay CGT on UK residential property disposals within 60 days of completion, using the HMRC Capital Gains Tax on UK property service. This is a separate process from your annual Self Assessment return, although the gain must also be reported on your tax return for the relevant year.

The HMRC CGT rates page provides the current rates and exemption amounts.

Making Tax Digital for Landlords

From April 2026, Making Tax Digital for Income Tax Self Assessment (MTD for ITSA) applies to landlords and self-employed individuals with qualifying income above £50,000. From April 2027, the threshold drops to £30,000. This is one of the most significant changes to the UK tax system in a generation, and landlords need to prepare now.

Under MTD, landlords must:

• Keep digital records of all income and expenses
• Submit quarterly updates to HMRC using compatible software
• Submit a final declaration at the end of each tax year

The quarterly updates are not tax returns — they are summaries of income and expenses for each quarter. They give HMRC visibility of your tax position throughout the year and allow you to see an estimate of your tax liability as the year progresses.

If you have rental income above the threshold, you will need MTD-compatible software. At Accounted, our platform is fully MTD-ready, and Penny can prepare and submit your quarterly updates automatically based on the transactions flowing through your connected bank accounts.

For more on preparing for MTD, see our self-assessment guide, which covers both the current Self Assessment process and the transition to MTD.

National Insurance Contributions

Rental income from buy-to-let properties is not generally subject to National Insurance Contributions (NICs). This is because property letting is classified as an investment activity rather than a trade. This is one of the few remaining tax advantages of property investment compared to self-employment.

There are limited exceptions — for example, if HMRC considers your property activities to constitute a trade (such as property development or running a guest house), NICs may apply. But for straightforward buy-to-let letting, NICs are not a concern.

Tax Planning Strategies for 2026

Use Your Personal Allowance Effectively

If one spouse or partner is a non-taxpayer or basic-rate taxpayer, consider structuring property ownership to ensure that rental income is allocated to the lower earner. This can be achieved through joint ownership with an appropriate Form 17 declaration.

Maximise Allowable Expenses

Ensure you are claiming every expense you are entitled to. Many landlords miss deductible costs such as mileage for property visits, the cost of energy performance certificates, and professional fees. Keeping meticulous records throughout the year — rather than scrambling at year end — is the key to maximising deductions.

Time Capital Improvements Carefully

Capital improvements (such as adding an extension or converting a loft) are not deductible against rental income, but they reduce your CGT liability when you eventually sell the property. Keep detailed records and receipts for all capital expenditure, as these can save you significant amounts of CGT years or even decades later.

Consider Your Portfolio Structure

For landlords with multiple properties and high borrowing, the Section 24 impact can be severe. Consider whether restructuring — through incorporation, debt reduction, or portfolio rationalisation — could reduce your overall tax burden. Each of these strategies has its own costs and complexities, and professional advice is strongly recommended.

For guidance on managing tax across a multi-property portfolio, see our article on multiple property portfolios and tax.

Plan for CGT in Advance

If you are considering selling a property, plan the disposal carefully. Consider whether you can use your annual CGT exemption, time the sale to a year when your other income is lower, or make pension contributions to reduce your taxable income and keep more of the gain in the basic-rate CGT band.

How Accounted Supports Buy-to-Let Landlords

At Accounted, we have built our platform specifically for the needs of UK landlords. Penny automatically categorises rental income and expenses, tracks mortgage interest separately for the Section 24 calculation, and calculates your rental profit in real time. When MTD quarterly updates are due, Penny prepares the figures and submits them to HMRC on your behalf.

Our platform handles single properties and multi-property portfolios alike, giving you a clear picture of each property's performance as well as your overall tax position. Whether you are a first-time landlord with a single buy-to-let or an experienced investor with a dozen properties, Accounted gives you the tools to manage your property finances efficiently and compliantly.

You can explore our pricing plans or sign up today to start managing your buy-to-let tax affairs with confidence.

The buy-to-let market continues to offer genuine opportunities for wealth creation, but the days of simple tax treatment are behind us. Success in 2026 and beyond requires careful planning, diligent record-keeping, and a clear understanding of the rules. With the right approach and the right tools, property investment remains a rewarding endeavour — but only if you get the tax right.

Accounted includes built-in property management — track rental income, Section 24, and allowable expenses across multiple properties. See property features →