HMO Landlord Tax UK 2026/27: Rental Income, Allowable Costs and Capital Gains
Full guide to HMO landlord tax in 2026/27. Covers rental income, allowable expenses, mortgage interest restriction, business rates, and CGT on HMO disposals.
HMO Landlord Tax in 2026/27: A Complete Guide
Houses in Multiple Occupation (HMOs) are one of the most popular strategies for buy-to-let landlords seeking higher rental yields. A well-managed HMO can generate significantly more income than a single-tenancy property of the same size -- but it also comes with more complex tax obligations and management costs.
This guide explains how HMO rental income is taxed in 2026/27, what costs you can deduct, how the mortgage interest restriction affects you, and what happens when you sell.
What Is an HMO?
An HMO (House in Multiple Occupation) is broadly defined as a property where:
- 3 or more tenants live in the property
- Those tenants form 2 or more separate households (i.e., they are not all from the same family)
- The tenants share facilities -- such as a kitchen, bathroom, or living room
The formal legal definition under the Housing Act 2004 is more detailed and has additional tests. For licensing purposes, a mandatory HMO licence is typically required for properties with 5 or more tenants in 2 or more households on 3 or more storeys -- though many councils have adopted additional licensing schemes covering smaller HMOs.
For tax purposes, HMOs are treated as residential property -- and that classification matters significantly.
How HMO Rental Income Is Taxed
HMO income is taxed as UK property income under the standard residential landlord rules. There is no special HMO tax category.
Your net rental profit -- income minus allowable expenses -- is added to your other income and taxed at your marginal rate:
| Income Band (2026/27) | Rate |
|---|---|
| Up to £12,570 | 0% (Personal Allowance) |
| £12,571 to £50,270 | 20% |
| £50,271 to £125,140 | 40% |
| Above £125,140 | 45% |
If you have multiple rental properties, your profits and losses across all of them are pooled together into a single "UK property business."
Allowable Expenses for HMO Landlords
HMO landlords can deduct the same expenses as any other residential landlord, provided the expense is wholly and exclusively incurred for the property business.
Revenue Expenses (Deductible in Full)
- Letting agent fees and management charges -- HMOs typically incur higher management fees due to the increased workload, and these are fully deductible
- Repairs and maintenance -- fixing a broken boiler, repainting rooms between tenancies, repairing damaged flooring
- Insurance -- buildings and contents insurance specifically for the rental property (not general home insurance)
- Utilities (if the landlord pays them) -- gas, electricity, water, broadband
- Council tax (if landlord-paid, for example between tenancies)
- HMO licence fees -- annual licence fees paid to the local authority
- Safety compliance -- annual gas safety certificates, periodic electrical installation condition reports (EICRs), fire alarm servicing
- Accountancy fees related to the property business
- Advertising costs -- SpareRoom listings, local adverts
Capital vs Revenue: A Critical Distinction
You can only deduct revenue expenditure in the year it is incurred. Capital expenditure -- work that improves the property beyond its original state -- cannot be deducted as an expense. Instead, it is added to the property's cost base for CGT purposes when you eventually sell.
Replacing a kitchen with a like-for-like equivalent = revenue (deductible). Installing an en-suite bathroom where there was none before = capital (not deductible, but reduces future CGT).
The Mortgage Interest Restriction
This is the most significant tax change affecting residential landlords in recent years, and it applies fully to HMO owners.
Since April 2020, mortgage interest is not deductible against rental income. Instead, you receive a 20% basic rate tax credit on your finance costs.
How It Affects Higher-Rate Taxpayers
If you pay tax at 40%, the restriction means you effectively lose half the value of your mortgage interest deduction.
Example:
- HMO gross rent: £30,000
- Allowable expenses (excluding mortgage): £8,000
- Mortgage interest: £10,000
- Net rental income before restriction: £12,000 (£30,000 - £8,000 - £10,000)
Under old rules: taxable profit = £12,000; tax at 40% = £4,800
Under current rules:
- Taxable profit = £22,000 (£30,000 - £8,000; mortgage excluded)
- Tax at 40% = £8,800
- Minus 20% credit on £10,000 mortgage = £2,000
- Net tax = £6,800 -- £2,000 more than under the old rules
Replacement of Domestic Items Relief
HMO landlords can claim Replacement of Domestic Items Relief when they replace existing furnishings. This covers:
- Beds, sofas, tables, wardrobes and other furniture
- Washing machines, fridges, and other white goods
- Carpets and flooring
- Curtains, blinds, and soft furnishings
The relief covers the cost of the replacement item (or equivalent modern item if an exact replacement is no longer available), minus any proceeds from disposing of the old item.
You cannot claim the initial purchase of furniture when you first let the property. Only replacements qualify.
Business Rates vs Council Tax on HMOs
This is an area that catches many HMO landlords off guard.
HMOs with Up to 5 Lettable Rooms
Typically assessed for council tax -- and it is the landlord (not tenants) who is liable for council tax in an HMO. This is a significant extra cost that is often overlooked.
Many landlords include council tax in the rent and claim it as a deductible expense. If tenants pay separately, it is their liability -- but this arrangement is unusual for classic HMOs.
HMOs with 6+ Lettable Rooms
Generally assessed for non-domestic rates (business rates) by the Valuation Office Agency (VOA). This can be more expensive than council tax -- but it opens up access to Small Business Rates Relief (SBRR). If the rateable value of the HMO is below £12,000, you may pay no business rates at all under SBRR.
The threshold and assessment method can vary. Contact the VOA if you are unsure how your HMO is assessed.
Capital Gains Tax on HMO Disposals
When you sell an HMO, you pay Capital Gains Tax on any gain:
- 18% if your total income (including the gain) falls within the basic rate band
- 24% if any of the gain falls above the basic rate band
The CGT annual exempt amount for 2026/27 is £3,000.
Your gain is calculated as: Sale proceeds minus original purchase price minus buying/selling costs (solicitor fees, stamp duty, estate agent fees) minus capital improvements (extensions, conversions, structural works)
You must report and pay CGT on residential property disposals within 60 days of completion via HMRC's online portal.
HMOs and Private Residence Relief
If you live in part of the HMO as your main home, you may be able to claim partial Private Residence Relief. This reduces the gain proportionally based on the floor area you occupied and the time you lived there. This can be valuable if you started out living in the property and later converted it fully to an HMO.
HMO Tax Through a Limited Company
Many landlords with larger HMO portfolios operate through a limited company. The key differences:
- Corporation tax applies at 25% on profits (the main rate for companies with profits over £50,000)
- Full mortgage interest deduction is still available inside a company
- Extracting profits incurs further personal tax (dividends or salary)
- Stamp Duty Land Tax on initial transfer from personal to company ownership can be expensive
The company route suits landlords with high mortgage debt and higher-rate tax positions -- but always model the numbers with an accountant before restructuring.
Summary
HMO landlords in 2026/27 face the same mortgage interest restriction as all residential landlords -- plus additional costs from HMO licensing, safety compliance, and potentially business rates on larger properties.
The key tax points to manage:
- Report all rental income via Self Assessment
- Deduct all allowable revenue expenses including management fees and safety certificates
- Claim Replacement of Domestic Items Relief for furnishings
- Plan CGT carefully before any sale
- Consider council tax versus business rates liability based on room count
Use our rental income calculator to estimate your after-tax profit from an HMO under different rental income and mortgage interest scenarios.
Frequently asked questions
What is the definition of an HMO for tax purposes?
HMRC does not have a specific tax definition of an HMO distinct from the Housing Act definition. An HMO is broadly a property occupied by 3 or more people from 2 or more separate households who share facilities. Tax treatment follows general residential property rules.
Do HMO landlords get full mortgage interest relief?
No. HMO properties are residential properties, and the mortgage interest restriction applies. You can only claim a 20% tax credit on mortgage interest, not a full deduction, regardless of your income tax rate.
Are larger HMOs subject to business rates instead of council tax?
Generally yes. An HMO with 6 or more lettable rooms is typically assessed for business rates by the Valuation Office Agency rather than council tax. Smaller HMOs (up to 5 rooms) are usually liable for council tax.
Can HMO income count as a business for Inheritance Tax purposes?
HMRC's view is that residential letting -- including HMOs -- does not qualify for Business Property Relief (BPR) for Inheritance Tax purposes. This position has been upheld in most tax tribunal cases.
In-depth guides
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