HMO Tax Rules: The Complete Guide for Houses in Multiple Occupation

Everything landlords need to know about HMO tax rules UK: income, expenses, licensing, SDLT and CGT on disposal. Blue Tick Accountants explains.

HMO Tax Rules: The Complete Guide for Houses in Multiple Occupation

Running a house in multiple occupation can be a genuinely profitable property strategy, but the HMO tax rules UK landlords must navigate are considerably more complex than those for a standard single-let property. Income classification, allowable expenses, mortgage interest restrictions, licensing costs, stamp duty, and capital gains tax all interact in ways that can either significantly increase your tax bill or, with proper planning, keep it under control.

This guide covers the full picture for 2026/27: how rental income from an HMO is taxed, which expenses you can legitimately deduct, how Section 24 affects your position, and what to expect when buying or selling an HMO property.

This guide covers:

  • How HMO rental income is classified and taxed by HMRC
  • Which expenses are allowable, including the replacement of domestic items
  • How the Section 24 mortgage interest restriction applies to HMOs
  • Whether HMO licensing costs attract tax relief
  • SDLT rates when purchasing an HMO in 2026/27
  • Capital gains tax rules when you come to sell

HMO Tax Rules UK: How Rental Income Is Classified and Taxed

A house in multiple occupation is broadly a property let to three or more tenants from at least two separate households who share communal facilities such as a kitchen or bathroom. Mandatory HMO licensing applies in England to properties with five or more occupants; many local councils also operate selective or additional licensing schemes covering smaller HMOs.

For tax purposes, house in multiple occupation tax treatment follows the standard property income rules. Income from an HMO is categorised as UK property income and charged to income tax. It is added to your other income and taxed at your marginal rate: 20% for basic rate taxpayers, 40% for higher rate, and 45% for additional rate taxpayers in 2026/27.

There is no special HMO income tax rate and no separate tax category for HMO landlords. The property income rules that apply to a single buy-to-let apply equally here.

If you own multiple properties, all UK rental income is pooled. Profits and losses from individual properties are combined before you arrive at the taxable figure. A loss from one property can offset profits from another in the same tax year.

Worked example: A landlord lets a six-bed HMO at £750 per room per month. Annual rental income is £54,000. Allowable expenses total £22,000 (repairs, insurance, agent fees, utilities, and licensing costs). Net property income is £32,000. As a higher rate taxpayer, the income tax liability on this profit is £12,800 before any adjustment for the Section 24 finance cost restriction (covered below).

Allowable Expenses for HMO Landlords

HMRC allows a deduction for costs that are incurred wholly and exclusively for the purposes of your property letting business. For HMO landlords, the most commonly claimed allowable expenses include:

Repairs and maintenance to the fabric of the property (including shared kitchens, bathrooms, and communal areas), buildings and contents insurance, letting agent and property management fees, utilities paid directly by the landlord, council tax where the landlord is the liable party, gas safety certificates, electrical installation condition reports (EICRs), fire safety assessments, and professional fees such as accountancy costs.

The key distinction is between repairs (restoring something to its original condition, which is revenue expenditure and fully deductible) and improvements (enhancing beyond the original, which is capital expenditure and not deductible against income). Replacing a like-for-like kitchen in a communal HMO space is a repair; installing a more expensive fitted kitchen where there was previously a basic one is an improvement.

For furnished HMOs, the replacement of domestic items relief allows you to deduct the cost of replacing moveable items such as beds, sofas, dining furniture, and white goods. The deduction covers the cost of a like-for-like replacement only; any uplift in cost for a higher-specification item is not allowable.

Initial costs incurred before the property first came onto the rental market (such as pre-letting refurbishment) are generally not deductible as revenue expenses, though they may be deductible as capital expenditure when calculating a future gain on disposal.

Section 24 and the Mortgage Interest Restriction

Section 24 of the Finance (No. 2) Act 2015 removed the right for individual landlords to deduct mortgage interest and other finance costs directly from rental income. This restriction applies in full in 2026/27 and affects HMO landlords in exactly the same way as any other residential landlord.

Under the current rules, finance costs are not deductible when calculating property income. Instead, you calculate your income tax on the full rental profit and then reduce your tax bill by a basic rate (20%) tax credit equivalent to the finance costs incurred.

For a basic rate taxpayer, this produces roughly the same outcome as the old system. For a higher or additional rate taxpayer, the effect is a significantly higher tax bill.

Worked example: An HMO landlord pays £15,000 per year in mortgage interest. Under the old system, a 40% taxpayer would have saved £6,000 in tax on that interest. Under Section 24, the saving is capped at 20% of £15,000, which equals £3,000. The difference of £3,000 per year is additional tax directly attributable to the restriction.

The Section 24 restriction does not apply to properties held within a limited company. Corporate landlords deduct finance costs as a business expense before arriving at taxable profits, which are then subject to corporation tax at 25% (for companies with profits above £250,000 in 2026/27). Whether restructuring into a company is worthwhile depends on your individual circumstances, including the cost of incorporation and the potential stamp duty land tax liability on transfer. Professional advice is essential before making this decision.

HMO Licensing Costs and Tax Relief

Most HMOs require a mandatory licence from the local authority, and many councils have extended licensing requirements to smaller HMOs through selective or additional licensing schemes. Licence fees vary considerably by area but can run to several hundred pounds per property per year or several thousand for a multi-year licence.

The good news for HMO landlord HMRC compliance purposes is that licence fees are a deductible business expense. HMRC accepts that costs incurred to comply with legal requirements connected to the letting business are revenue in nature and fully allowable.

Where a licence fee covers a period of more than one tax year, the deduction is spread over the relevant years on an accruals basis. A five-year licence fee paid upfront would be spread across five tax years.

Beyond the licence fee itself, the associated compliance costs are also allowable: fire risk assessments, EICRs, gas safety inspections, smoke and carbon monoxide alarm installations, and other works required to meet the HMO licence conditions. These are revenue costs incurred as a condition of operating the letting business.

It is worth noting that costs incurred to bring a property up to the standard required for an HMO licence before it has ever been let may be treated as pre-trading capital expenditure rather than revenue expenditure. These costs can still be deducted from any future capital gain on disposal, but they cannot be claimed against income.

SDLT When Buying an HMO

Stamp duty land tax applies to residential property purchases in England and Northern Ireland. When buying an HMO, the applicable SDLT rates depend on your personal circumstances and the purchase price.

If you already own at least one other residential property (including your own home), the additional dwellings surcharge applies. The surcharge rate is 5%, applied on top of the standard SDLT rates. This rate was increased from 3% with effect from 31 October 2024.

The standard residential SDLT rates for 2026/27 are: 0% on the first £125,000, 2% from £125,001 to £250,000, 5% from £250,001 to £925,000, 10% from £925,001 to £1.5 million, and 12% above £1.5 million.

Worked example: An experienced landlord purchases a seven-bed HMO for £420,000. As they already own their home and other buy-to-let properties, the 5% additional dwellings surcharge applies throughout. SDLT is calculated as: 5% on the first £125,000 = £6,250; 7% on the next £125,000 = £8,750; 10% on the next £170,000 = £17,000. Total SDLT: £32,000.

Multiple dwellings relief (MDR) was abolished for transactions completing on or after 1 June 2024. It is no longer possible to reduce the SDLT charge on an HMO purchase by treating individual rooms or units as separate dwellings.

Capital Gains Tax When You Sell an HMO

When you sell an HMO, the gain is subject to capital gains tax. House in multiple occupation tax obligations do not end at income tax: you also need to consider the CGT position carefully before any disposal. Residential property gains are charged at 18% for basic rate taxpayers and 24% for higher and additional rate taxpayers in 2026/27. The annual CGT exempt amount is £3,000 per individual.

The taxable gain is calculated as: disposal proceeds less the original acquisition cost, plus purchase-related costs such as SDLT and legal fees, plus any capital expenditure during ownership (improvements, not repairs), less selling costs such as estate agent and legal fees.

Expenditure already claimed as a revenue deduction against rental income cannot also be deducted as a capital cost.

For most professional HMO landlords, private residence relief (PRR) will not apply because they do not live in the property. If you have at any point occupied the HMO as your main home, partial PRR may be available, but the calculation is complex and the rules are fact-specific.

HMRC requires residential property disposals to be reported and any CGT paid within 60 days of completion. This is separate from the self-assessment return. Late reporting attracts penalties and interest, so the 60-day deadline is not one to miss. HMO landlord HMRC obligations in this area are the same as for any residential landlord.

How Blue Tick Can Help

HMO taxation touches income tax, capital gains tax, and stamp duty land tax, often simultaneously, and the interaction between these areas creates real planning opportunities that many landlords overlook. Blue Tick works with HMO landlords throughout Surrey and beyond, helping them structure their portfolios efficiently, manage Section 24 exposure, and stay compliant with HMRC's reporting requirements. Head to our website and book a meeting now.

Understanding HMO tax rules UK is not optional if you want to protect your returns as an HMO landlord. The combination of Section 24, the additional dwellings SDLT surcharge, and the 60-day CGT reporting window means there are three separate points in the lifecycle of an HMO where errors can be costly. Getting your expense records right, reviewing your financing structure, and planning disposals in advance will put you in a far stronger position than reacting to tax bills after the event.

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.