HMO Tax Rules: How to Calculate Rental Income and Claim Deductions on Multi-Tenant Properties

Houses in Multiple Occupation (HMOs) sit under the same income tax framework as any other residential let, but the day-to-day mechanics are different enough to trip up even experienced landlords. Multiple rooms, mixed occupancy, inclusive rent, communal running costs and HMO-specific compliance all change how you work out taxable income and what you can deduct.

This guide sets out the HMO tax rules for 2026/27: how to calculate rental income room by room, what counts as an allowable deduction, how Section 24, council tax, Replacement of Domestic Items Relief and Making Tax Digital apply, and what happens on disposal. It is the hub for our wider HMO content, so where a topic has its own detailed guide we link to it rather than repeat it.

One health warning first. A lot of HMO tax content online is out of date. Two errors are especially common: the 10% wear and tear allowance (abolished in 2016) and a stale or misleading VAT-registration claim. Both are corrected below, with the current statutory position.

HMO Tax at a Glance: Key Facts for 2026/27

The table below summarises the positions that most often get HMO landlords confused. Each is explained in full further down.

Tax point	Position for 2026/27
How HMO income is taxed	As part of your ordinary UK property business (profits taxed at your marginal income tax rate)
Income recognition	Cash basis by default; accruals (receivable) basis where gross cash receipts exceed 150,000 pounds
Mortgage interest (Section 24)	Not deductible from profit; given as a 20% basic-rate tax reduction
10% wear and tear allowance	Abolished from April 2016. No longer available
Replacing furniture and white goods	Replacement of Domestic Items Relief (ITTOIA 2005 s.311A), like-for-like, no relief on first purchase
Capital allowances on plant	Barred inside the dwelling by CAA 2001 s.35; communal common-parts plant can qualify
VAT on residential rent	Exempt (VATA 1994 Sch 9 Group 1); rent does not count toward the 90,000 pound threshold
Council tax	Usually one band for a shared-facilities HMO, landlord normally liable
Making Tax Digital for Income Tax	From 6 Apr 2026 above 50,000 pounds; 6 Apr 2027 above 30,000 pounds; 6 Apr 2028 above 20,000 pounds
CGT on disposal	18% (basic-rate band) / 24% (higher); annual exempt amount 3,000 pounds; no BADR for residential investment

How Is HMO Rental Income Calculated for Tax Purposes?

All income generated from the property is rental income, regardless of how it is described or split. The label "service charge" does not change its character if it is really part of what tenants pay to occupy a room. For an HMO this typically includes:

• Room rents: individual bedroom rental payments.
• All-inclusive rent: a single payment covering the room plus utilities, internet and other services.
• Separate service or utility charges: amounts billed on top of rent for utilities, internet, cleaning or maintenance.
• Retained deposits: only the part of a deposit you keep to cover unpaid rent or damage. A protected deposit you hold and later return is not income.
• Other tenant charges: administrative charges and any late-payment fees actually received.

Recognising Income Room by Room and Period by Period

Most HMO landlords account room by room, treating each let bedroom as its own income stream so void periods and rent changes are easy to track. The key discipline is recognising income for the period it is earned, only for the time a room was genuinely let.

By default a property business uses the cash basis: you count rent when you receive it. If your gross property cash receipts exceed 150,000 pounds in the tax year, you must instead use the accruals (receivable) basis, recognising rent as it falls due. Either way, you should not inflate the figure by assuming every room was full all year.

For example, a five-room HMO with rooms let at varying rents, where one room sat empty for two months between tenancies, is taxed on the rent actually due across the periods each room was occupied, not on a theoretical fully let figure. Tracking occupancy by room and by month makes this straightforward and gives you a defensible audit trail if HMRC ever asks.

What Expenses Can HMO Landlords Deduct?

HMO deductions follow the ordinary property-business rules in ITTOIA 2005: a cost is allowable if it is a revenue (not capital) expense incurred wholly and exclusively for the letting. HMOs simply tend to incur more of these costs, and more communal ones, than a single-let property.

Common Allowable Revenue Costs

• Communal running costs: cleaning of shared areas, communal repairs and redecoration, gardening, waste and recycling, communal lighting and security systems.
• Landlord-paid utilities and council tax: gas, electricity, water and broadband where you provide them inclusively, and council tax where you are the liable person.
• Compliance and safety: HMO licence fees and renewals, annual gas safety certificates, the five-yearly electrical (EICR) inspection, fire risk assessments, fire alarm and emergency lighting servicing, and PAT testing.
• Professional and management costs: letting and management agent fees, accountancy, and legal fees on routine tenancy and compliance matters.
• Insurance: specialist HMO buildings, contents and landlord liability cover.
• Finance costs other than interest: for example, mortgage arrangement and broker fees on a residential let are subject to the Section 24 restriction rather than a straight deduction (see below).

The Revenue Versus Capital Line

The single most important judgement in HMO expenses is whether a cost is a repair (revenue, deductible now) or an improvement (capital, added to your CGT base cost). Replacing a worn-out boiler with a modern equivalent is usually a repair. Converting a family home into an HMO, adding ensuites or reconfiguring rooms is improvement, and that initial conversion spend is capital. Getting this line right protects both your income tax position and your future CGT calculation.

Replacing Furniture and White Goods (Not the Old 10% Allowance)

If you have read elsewhere that you can deduct a flat 10% of rent as a wear and tear allowance, that is wrong. The 10% wear and tear allowance was abolished from April 2016 and is not available to any residential landlord, furnished or otherwise. It was replaced by Replacement of Domestic Items Relief (ITTOIA 2005 s.311A), which works very differently.

RDIR gives a deduction when you replace a domestic item provided for tenant use, such as beds, mattresses, sofas, fridges, washing machines, carpets, curtains and crockery. The four statutory conditions are that you carry on a property business including a dwelling, you replace an old item with a new one provided solely for the tenant, the cost is not capital and is wholly and exclusively for the business, and no capital allowance is claimed on it. Key points for HMO landlords:

• The relief is for replacement only. There is no deduction for the first time you buy an item to furnish a room.
• The replacement must be substantially the same. If you upgrade (say a basic fridge to a high-spec one), relief is capped at the cost of a like-for-like replacement.
• You can add the incidental costs of disposing of the old item and acquiring the new one, less any proceeds from selling or part-exchanging the old item.
• Fixtures are excluded. Boilers, fitted kitchens and integral heating are part of the building, not domestic items, so they fall outside RDIR.

Capital Allowances: What Communal Plant Can and Cannot Qualify

Capital allowances are tightly restricted for residential lettings. CAA 2001 s.35 bars plant and machinery allowances for plant provided for use in a dwelling-house. So furniture, appliances and heating inside the let rooms do not qualify (RDIR is the route for replacements instead).

The narrow opening is the communal common parts of a multi-let building. Plant in shared areas that are not part of any single dwelling, for example a communal boiler serving the whole house, communal lighting, a lift or fire-alarm system in the common parts, can qualify for plant and machinery allowances, with the main pool written down at 14% from April 2026 (reduced from 18% by Finance Act 2026 s.28). This is a specialist area with a genuine dwelling-house boundary to police, so we cover the mechanics in the dedicated guide to HMO common-parts capital allowances and the s.35 claim.

Section 24 and HMO Mortgage Interest

HMO mortgages are caught by the same Section 24 restriction as any residential buy-to-let. You can no longer deduct mortgage and other finance costs from rental profit. Instead, you pay tax on the full rental profit and then receive a tax reduction worth 20% of your finance costs.

A Worked Example

Take a higher-rate landlord whose HMO produces 30,000 pounds of rental income with running costs of 6,000 pounds and mortgage interest of 12,000 pounds.

• Taxable rental profit is 30,000 minus 6,000, which is 24,000 pounds. The interest is not deducted here.
• Income tax at 40% on 24,000 pounds is 9,600 pounds.
• The Section 24 reduction is 20% of the 12,000 pounds interest, which is 2,400 pounds.
• Net income tax on the HMO is 9,600 minus 2,400, which is 7,200 pounds.

Under the pre-2017 rules the same landlord would have deducted the interest in full and paid 40% on 12,000 pounds (24,000 minus 12,000), which is 4,800 pounds. The Section 24 restriction therefore costs this landlord an extra 2,400 pounds for the year. The effect grows with borrowing and bites hardest on higher and additional-rate taxpayers, which is why some HMO investors model whether a limited company structure works for them. We weigh that decision in the guide to incorporating an HMO into a limited company, where mortgage interest remains a deductible business cost but other charges (potential CGT and SDLT on transfer, ongoing compliance) come into play.

Council Tax and Business Rates for an HMO

HMO landlords ask two recurring questions here: who pays the council tax on a house of multiple occupancy, and could the property be assessed for business rates instead.

For a traditional shared-facilities HMO, the whole property is normally a single council tax dwelling and, under the Local Government Finance Act 1992, the landlord is the liable person even where tenants hold individual room agreements. Landlords usually recover this through inclusive rent. Where rooms are self-contained with their own kitchen and bathroom, the Valuation Office Agency has at times banded each room separately, which caused disputes and unexpected bills. The government has confirmed it will change the rules so that a typical HMO is treated as one dwelling rather than room-by-room. The detail and timing are covered in our note on the plan to end council tax on individual HMO rooms.

A small number of HMOs that operate more like serviced commercial accommodation can fall into business rates rather than council tax. Whichever charge you, as landlord, actually pay is a deductible revenue expense against your rental income.

VAT and HMOs: Why Rent Almost Never Triggers Registration

This is the second area where online advice is frequently wrong. You may have seen a claim that an HMO landlord whose income exceeds the VAT threshold must register for VAT. That is misleading.

Residential letting is an exempt supply under VATA 1994 Schedule 9 Group 1. Exempt income does not count towards the taxable-turnover test for VAT registration. The standard registration threshold is 90,000 pounds of taxable turnover, but because residential rent is exempt rather than taxable, even a large HMO portfolio does not require VAT registration on the rent alone.

VAT only becomes relevant where you make genuinely separate standard-rated supplies, for instance running serviced or short-stay accommodation, or separately charging for cleaning, laundry or meals as distinct services, and those standard-rated supplies exceed the threshold. For an ordinary residential HMO, that is rarely the case. If you do provide additional services, take advice before assuming either that you must register or that you are exempt.

HMO Landlord Tax Planning

Good HMO landlord tax planning is mostly about getting the basics right consistently, then layering structural choices on top. The order matters: claim everything you are entitled to before chasing more complex strategies.

• Claim every allowable revenue cost. HMOs carry more compliance and communal expenditure than single lets, and these are easy to under-claim. A complete expense schedule, room by room where helpful, is the foundation.
• Police the repair-versus-improvement line. Treating a genuine repair as capital loses you relief now; treating an improvement as a repair invites an HMRC challenge. Document the basis for each significant cost.
• Use RDIR properly on furnishings. Keep evidence of like-for-like replacements and the incidental costs you add.
• Review your ownership structure. Section 24 has made the personal-versus-company question central for geared HMO landlords. The answer depends on your marginal rate, borrowing and whether you reinvest or draw profits.
• Time discretionary spend. Where commercially sensible, spreading licence renewals or larger works across tax years can smooth relief and keep you below thresholds that matter to you.
• Get MTD-ready early. Digital records and compatible software reduce risk and make the quarterly cycle painless.

If you compare an HMO with a standard single let, the higher gross yield usually comes with more cost, more compliance and a sharper Section 24 effect from typically higher borrowing. Our HMO versus standard buy-to-let tax comparison sets the two side by side, and the detail on licensing relief is in the guide to whether HMO licensing fees are tax deductible.

Making Tax Digital for HMO Landlords

HMO record-keeping is already more involved than a single let, with multiple tenancies, changing occupancy and inclusive-rent splits to track. Making Tax Digital for Income Tax formalises that discipline.

It becomes mandatory from 6 April 2026 for landlords (and sole traders) whose combined gross income exceeds 50,000 pounds, then from 6 April 2027 above 30,000 pounds, and from 6 April 2028 above 20,000 pounds. The test is on gross income, not profit, so a single HMO can put you over the line. In scope, you must keep digital records, submit quarterly updates of income and expenses, and file a final declaration after the tax year. Building your room-by-room rent roll into MTD-compatible software now removes the year-end scramble later.

Capital Gains Tax When You Sell an HMO

An HMO held as an investment is residential property for capital gains tax. On disposal, the gain above the annual exempt amount (3,000 pounds for 2026/27) is taxed at 18% to the extent it falls within your remaining basic-rate band and 24% above it.

Two HMO-specific points are worth flagging. First, genuine improvement expenditure, such as the original conversion to HMO use or adding ensuites, adds to your base cost and reduces the gain, whereas routine repairs (already relieved against income) do not. Second, Business Asset Disposal Relief is not available for a residential property investment, so do not assume the 10% BADR rate applies. A UK residential property disposal also has to be reported and the tax paid within 60 days of completion, separate from the annual return.

Record-Keeping and Getting It Right

For an HMO, keep tenancy agreements, a monthly rent roll by room, deposit-protection records, all utility and service invoices, council tax and licence documentation, and the safety certificates (gas, electrical, fire) you are required to hold. These records support both your income computation and your evidence base for repairs, RDIR claims and the eventual CGT calculation. Where the property sits in a portfolio, a clear allocation of shared costs between properties keeps each computation defensible.

Where to Get Specialist HMO Tax Advice

HMO taxation rewards attention to detail: the income-recognition basis, the communal-versus-dwelling expense split, RDIR rather than the abolished wear and tear allowance, the s.35 capital-allowances boundary, Section 24 and the structural choices it drives. If you own multiple HMOs, are weighing incorporation, face licensing or banding changes, or are planning a disposal, a specialist review pays for itself in accuracy and peace of mind. Use the form on this page to request a free, no-obligation consultation with a property tax adviser who works with HMO landlords every day.