HMO Licensing Rules and HMRC: Keeping Your Compliance Costs Deductible

HMO tax rules in the UK treat a house in multiple occupation as ordinary rental property for tax, meaning the rent is taxed as property income and most licensing and running costs are deductible, but finance costs are restricted and the higher rates of Stamp Duty Land Tax and Capital Gains Tax can apply. A house in multiple occupation, or HMO, is a property let to three or more tenants from more than one household who share facilities such as a kitchen or bathroom. Because HMOs carry extra licensing obligations and higher running costs, knowing which of those costs HMRC lets you deduct is what protects your margin. Blue Tick Accountants, a Guildford-based UK tax advisory and accountancy practice, helps HMO landlords claim everything they are entitled to while staying compliant.

This article covers how HMO income is taxed, which expenses and licensing costs are allowable, the Section 24 finance cost restriction, and the CGT and SDLT position on HMOs.

Key Takeaways

• HMO rental income is taxed as property income at your marginal rate of 20%, 40% or 45% in 2026/27, the same basis as any other let property.
• Mandatory HMO licences are required for properties let to five or more people from more than one household, and the licence fee is a deductible revenue expense spread over the licence period.
• Allowable HMO expenses include letting agent fees, insurance, cleaning of communal areas, utility bills paid by the landlord, repairs, and safety certificates such as gas, electrical and fire alarm checks.
• The Section 24 finance cost restriction means mortgage interest on an HMO is not deducted from profit but instead gives a 20% tax credit, hitting higher-rate HMO landlords hardest.
• Buying an HMO usually attracts the 5% Stamp Duty Land Tax surcharge for additional residential property, on top of standard SDLT rates, unless it qualifies as mixed-use or non-residential.
• Selling an HMO held personally is subject to Capital Gains Tax at 18% for basic-rate and 24% for higher-rate taxpayers in 2026/27, after the £3,000 annual exempt amount.

How Is HMO Rental Income Taxed in 2026/27?

HMO rental income is taxed as property income at your marginal rate, so it is added to your other income and taxed at 20%, 40% or 45% in 2026/27. There is no separate HMO tax regime: for HMRC, a house in multiple occupation is a rental business like any other, and profit is the rent received less allowable expenses. Because HMOs generate higher rents per property than a single let, the profit, and therefore the tax, is often larger, which makes efficient expense claims more valuable. You report HMO profit on the property pages of your self-assessment return, and if you own jointly, for example with a spouse, the profit is split according to your ownership shares.

Worked example: an HMO produces £30,000 of rent a year with £11,000 of allowable running costs, giving a £19,000 profit before finance costs. A higher-rate landlord pays 40% on that £19,000, or £7,600, before applying the separate mortgage interest tax credit described below. Accurate house in multiple occupation tax records are what keep that expense figure, and the bill, correct.

Which HMO Licensing and Running Costs Are Deductible?

Most HMO licensing and running costs are deductible as revenue expenses because they are incurred wholly and exclusively for the rental business. For an HMO, which carries more obligations than a standard let, this list is longer and more valuable.

Deductible HMO costs typically include the HMO licence fee, letting and management agent fees, landlord insurance, gas safety certificates, electrical installation condition reports, fire alarm and emergency lighting servicing, communal cleaning, gardening, and utility bills where the landlord pays them rather than the tenants. Repairs that restore the property, such as fixing a boiler or repainting, are deductible, though improvements that enhance it are treated as capital and set against a future CGT bill instead.

The HMO licence fee is a revenue expense, and because a licence usually runs for five years, HMRC expects the cost to be spread across the period it covers rather than deducted all in the first year. For a complete breakdown of allowable costs, see our guide to HMO tax rules.

How Does the Section 24 Restriction Affect HMO Landlords?

The Section 24 finance cost restriction means an HMO landlord cannot deduct mortgage interest from rental profit and instead receives a basic-rate tax credit worth 20% of the interest. This rule applies to individually owned residential rental property, including HMOs, and it hits higher-rate and additional-rate landlords hardest because they get relief at 20% rather than at their marginal 40% or 45%.

In practice, your full rental profit is taxed first, then a tax reducer equal to 20% of your finance costs is subtracted from the tax due. For an HMO landlord with £10,000 of annual mortgage interest, that means a fixed £2,000 credit regardless of tax band, rather than the £4,000 of relief a higher-rate taxpayer would once have received. This is a common reason HMO landlords consider holding property through a limited company, where mortgage interest remains fully deductible against company profits. Incorporation carries its own costs and tax consequences, so for HMO landlord HMRC planning it should be modelled carefully before any transfer.

What Are the CGT and SDLT Rules When You Buy or Sell an HMO?

Buying an HMO usually attracts the additional-property Stamp Duty Land Tax surcharge, while selling one held in your own name is subject to Capital Gains Tax on the gain. On purchase as an additional residential property, you pay standard SDLT rates plus the 5% surcharge on the whole price in 2026/27. Some larger or genuinely mixed-use HMOs may fall under non-residential SDLT rates, which can be lower, but this depends on the specific facts and HMRC scrutinises such claims closely.

On sale, Capital Gains Tax applies to the profit after deducting your purchase price, buying and selling costs, and qualifying capital improvements. For 2026/27, residential property gains are taxed at 18% within the basic-rate band and 24% above it, after the £3,000 annual exempt amount.

Worked example: a higher-rate landlord sells an HMO for a £90,000 gain. After the £3,000 exemption, £87,000 is taxable at 24%, producing a CGT bill of £20,880. Reporting and paying this within 60 days of completion is a strict HMRC requirement for UK residential property.

Frequently Asked Questions

Are HMOs taxed differently from normal rental properties?

HMOs are not taxed under a separate regime; HMO rental income is taxed as property income at your marginal rate of 20%, 40% or 45%, exactly like any other let. The practical differences are that HMOs usually have higher rents and more running costs, and they carry extra licensing and safety obligations, many of which are deductible expenses.

Is the HMO licence fee tax deductible?

Yes, the HMO licence fee is a deductible revenue expense because it is incurred wholly and exclusively for the rental business. Because an HMO licence typically lasts five years, HMRC expects the cost to be spread across the period the licence covers rather than claimed in full in the year of payment, so a £1,000 five-year licence is relieved at roughly £200 a year.

Can HMO landlords still deduct mortgage interest?

Individual HMO landlords cannot deduct mortgage interest from profit. Under the Section 24 finance cost restriction, mortgage interest instead gives a basic-rate tax credit worth 20% of the interest paid. Higher-rate and additional-rate landlords therefore get relief at 20% rather than their marginal rate, which is why some hold HMOs through a limited company where interest stays fully deductible.

Do you pay the stamp duty surcharge on an HMO?

Buying an HMO as an additional residential property normally attracts standard Stamp Duty Land Tax plus the 5% additional-property surcharge on the full purchase price in 2026/27. Certain large or genuinely mixed-use HMOs may qualify for non-residential SDLT rates, which can be lower, but HMRC examines these claims carefully and they depend on the property's specific facts.

How much Capital Gains Tax do you pay when selling an HMO?

Selling an HMO held in your own name attracts Capital Gains Tax on the gain at 18% for basic-rate taxpayers and 24% for higher-rate taxpayers in 2026/27, after deducting the £3,000 annual exempt amount and allowable costs. The tax must be reported and paid to HMRC within 60 days of completion for UK residential property.

How Blue Tick Can Help

Blue Tick Accountants helps HMO landlords calculate their property income correctly, claim every allowable licensing, safety and running cost, and plan around the Section 24 restriction, SDLT surcharge and CGT on disposal. The team can model whether personal or company ownership is more efficient for your HMO portfolio and make sure returns and 60-day CGT reports are filed on time. If you own or are buying a house in multiple occupation, Blue Tick can review your position and find the compliant savings. Head to our website and book a meeting now.

Conclusion

An HMO is taxed as a rental business, so the profit that reaches your tax return depends heavily on how thoroughly you claim licensing, safety and running costs, while Section 24, the SDLT surcharge and CGT on disposal shape the bigger picture. Keep detailed records of every deductible cost and take advice before buying, incorporating, or selling. Doing so is the difference between an HMO that quietly leaks tax and one that works efficiently for you.

About the Author

This guide was written by Leon, founder of Blue Tick Accountants, a Guildford-based UK tax advisory and accountancy practice that helps landlords, limited company owners and the self-employed across the UK. Leon is a chartered tax adviser and accountant, and this article was last reviewed for the 2026/27 tax year.

This article is intended for general informational purposes only and does not constitute tax, legal, or financial advice. Tax rules are subject to change and their application will depend on your individual circumstances. You should always seek advice from a qualified professional before taking action. Blue Tick Accountants accepts no liability for decisions made on the basis of this content.