Everything a person lets in the UK, in the same legal capacity, is one UK property business for tax. All the rents and expenses are pooled, so a loss on one property is absorbed by profits on another. Lettings abroad form a separate overseas property business, and lettings run through a partnership, a trust, an estate or a company each sit in their own separate business.

What does the law actually say?

Section 264 of the Income Tax (Trading and Other Income) Act 2005 (ITTOIA 2005) says a person’s UK property business consists of every business they carry on for generating income from UK property, plus every one off transaction entered into for that purpose. Section 205 of the Corporation Tax Act 2009 (CTA 2009) uses identical wording for companies. The word “every” does the work: it does not create one business per house, flat or tenant.

HMRC’s Property Income Manual at PIM1020 puts it plainly. It makes no difference how many properties the landlord has or how many different types of property income they receive; normally all the receipts and expenses are amalgamated, and expenses on one property can be deducted from receipts of another. Former furnished holiday lettings were always part of the same UK or overseas business rather than a third category, and PIM1020 notes the special furnished holiday letting rules ceased to apply from 6 April 2025 for Income Tax and Capital Gains Tax and 1 April 2025 for Corporation Tax.

What does pooling mean in practice?

HMRC’s case study guidance gives the example of Carol, who has five UK properties. Two of them make losses of £1,500 and £1,000, while the other three make profits. Her total rents are £35,000 and total expenses £24,500, so she is taxed on a single profit of £10,500. She does not claim relief for the two loss making properties; it happens automatically because the properties form one business.

Pooling has other effects that landlords often miss:

  • Start date. PIM2505 says the business starts when the first property is let. Costs of getting a second or later property ready are part of the existing business, provided they are revenue costs, rather than pre letting expenses of a new business. See starting and ending a property business.
  • Selling one property. Disposing of one house does not end the business if others are still let, so brought forward losses survive.
  • Thresholds. The cash basis threshold of £150,000 in PIM1092 is tested on the receipts of the business as a whole, not property by property.

Why are overseas lettings kept apart?

Section 265 ITTOIA 2005 defines an overseas property business in the same terms as a UK one, but for property outside the UK. PIM1025 and PIM4702 confirm that it is a separate business: profits and losses of the two are not combined, and a loss on one cannot be set against profits of the other. A UK resident with a flat in Manchester and a villa in Portugal therefore runs two property businesses and reports each on its own pages of the tax return.

The separation has a sharper edge under the foreign income and gains regime that started on 6 April 2025. PIM4205 explains that a person who claims relief under that regime for a tax year cannot claim relief for overseas property losses in that year, and any losses brought forward on the overseas business are treated as nil. Our guide to overseas rental income covers the rest of the overseas rules.

When does the same person have more than one UK business?

PIM1020 explains that the single business rule works by legal capacity. Activities are parts of one business only where they are carried on by the same person acting in the same capacity. An individual who owns houses personally, is a partner in a firm that lets property and is a trustee of a family trust has three separate property businesses. Executors are in the same position: they act for the estate, not for themselves. A loss in one capacity cannot be set against a profit in another.

Joint owners

Owning a property jointly does not, on its own, create a partnership. PIM1035 says that usually there is no partnership, and an individual’s share of the profit or loss from a jointly owned property simply forms part of their personal property business alongside anything they own alone. Spouses and civil partners living together are treated as entitled in equal shares under section 836 of the Income Tax Act 2007 unless an exception applies, most commonly a joint declaration on form 17 under section 837 where their interests in the property and the income match. See jointly owned rental property.

Partnerships

Where a joint letting genuinely is a partnership, PIM1035 says the partnership property business is separate from any business the partners carry on personally, and a partnership loss cannot be deducted from a personal profit or the other way round. HMRC’s example is Simon, who lets a holiday cottage and a garage in his own name and is also a partner in a haulage firm that lets buildings to other traders. He runs two property businesses and must report each separately. If someone is in more than one partnership, each is a separate business.

How are company lettings kept separate?

A company is a separate person. Section 205 CTA 2009 gives it its own UK property business, and section 206 its own overseas property business, taxed to Corporation Tax. Property you own personally and property your company owns are never pooled, even if you control the company. PIM1005 adds that the restriction on finance costs for residential lettings does not apply to companies, and PIM4236 explains that a company’s unrelieved UK property business loss can be carried forward against its total profits of the next accounting period, provided it continues to carry on the property business. Our guide to buy to let through a limited company looks at the wider comparison.

What happens to losses within one business?

Because the business is a single unit, PIM4210 explains that an overall loss is carried forward automatically under sections 118 and 119 of the Income Tax Act 2007 and set against later profits of the same property business, without a claim. It cannot be carried across to a business in another capacity, and it is lost when the business ceases. If a landlord sells everything and starts letting again after a gap, losses from the old business cannot be used in the new one. Expenses on a property let on uncommercial terms, such as cheaply to a relative, are capped at the rent from that property and cannot create a loss (PIM4205). More detail is in our guide to rental losses.

Do separate businesses count together for Making Tax Digital?

Yes. HMRC’s guidance on qualifying income says it is the total gross income from self employment and property, before expenses. For a UK resident, both UK and foreign property income count, so separate UK and overseas businesses are added together. A share of profit from a partnership as an individual partner does not count. The thresholds are £50,000 of qualifying income in 2024 to 2025 for those starting from 6 April 2026, £30,000 in 2025 to 2026 for 6 April 2027 and £20,000 in 2026 to 2027 for 6 April 2028. See Making Tax Digital for Income Tax.

How does this look for one landlord?

Illustration only. Aisha owns two flats in her own name, which make a profit of £9,000. She also owns half of a house with her brother, with no partnership, and her share is a loss of £2,000. She lets an apartment in Spain at a loss of £1,500, and she is a partner in a property partnership whose results are reported on the partnership return.

Business Contents Result
Personal UK property business Two flats and half share of the house Profit £7,000
Overseas property business Spanish apartment Loss £1,500 carried forward against future overseas profits
Partnership property business Her partnership share Kept separate from both of the above

The Spanish loss does not reduce her UK profit, and a partnership loss could not reduce it either.

What mistakes come up most often?

  • Preparing separate tax computations for each house and carrying each loss forward on its own, rather than one pooled result.
  • Netting a foreign rental loss against UK rental profits.
  • Treating an ordinary joint ownership as a partnership, or a real partnership as joint ownership.
  • Mixing trust or estate lettings into a personal return because the same individual manages them.
  • Assuming a director can use the company’s property losses personally, or the reverse.

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Sources

Reviewed by Christine Anderson, Broker, Solar Protect. Last reviewed 19 October 2026. Part of Accountapedia, the Solar Protect guide to UK tax and accounting. This page is general information, not personalised advice.