A rental loss is not a trading loss: five differences that decide what it is worth
A trader who makes a loss can usually set it against other income and get tax back quickly. A landlord who makes a loss usually cannot. A rental loss is carried forward against future profits of the same property business, used automatically whether that suits or not, and lost if the business comes to an end, including when the portfolio moves into a company. Here are the five differences that matter, and what they mean for the timing of a large repair.
Why the two regimes part company
Letting property is not a trade, and the Income Tax Act 2007 gives the two kinds of loss quite different treatment. Trading losses have a menu of reliefs: against other income of the same or the previous year, against income of earlier years in the first four years of a business, against earlier trading profits in its final year, against capital gains, and, on incorporation, against income from the new company. Property losses have almost none of that. Most landlords discover the difference in the year they spend heavily on a property and expect the tax saving to follow, and it is worth understanding before the money is spent rather than after.
Difference one: a rental loss rarely touches your other income
Section 120 allows a property loss to be set against general income, meaning salary, pension, trading profit and the rest, only to the extent the loss has a capital allowances connection or a relevant agricultural connection. The amount that can be used that way is the lower of the loss and the net capital allowances, or the relevant agricultural expenses, that went into it. Anything else in the loss, whether repairs, letting agents' fees or insurance, cannot be set sideways at all. A residential landlord rarely has meaningful capital allowances, because they are not available on furniture and equipment in a dwelling, so for most residential landlords this relief is simply not in play. Two further limits close it off. The structures and buildings allowance is expressly disregarded in deciding whether a capital allowances connection exists. And a landlord whose profits are computed on the cash basis cannot claim relief against general income for a property loss at all. Where the relief is available, the claim can be for the year of the loss or the following year, must be made within a year of the normal self assessment filing date for the year the claim specifies, and counts towards the general cap on income tax reliefs of GBP 50,000 or, if greater, 25 per cent of adjusted total income.
Difference two: carried forward automatically, whether that suits you or not
What cannot be set sideways is carried forward under section 118 and set against the profits of the same property business in later years. HMRC's manual is explicit that this happens automatically and against the first available profits. There is no election to skip a year. A landlord whose rental profit next year would in any case be covered by an unused personal allowance, perhaps in a year of low other income, uses the loss there and gets no tax value from it at all. A trading loss carried forward is also set against the first available profits of the same trade, so this difference is less about the mechanics than about the absence of every alternative.
Difference three: one business, one pot, but not one pot for everything
For income tax, all of a person's UK lettings in the same capacity form a single UK property business. That works in the landlord's favour within the portfolio: a loss on one flat is simply netted against profit on another in the same year, without any claim. Lettings held in a different legal capacity, as a trustee for instance, are a separate business, and HMRC confirms a loss in one cannot be carried across to the other. An overseas property business is separate from a UK one, and losses do not cross between them. A property let on uncommercial terms, such as to a relative at a nominal rent, cannot produce a loss at all, because HMRC limits its expenses to the rent it generates. And furnished holiday let losses, which until 2024/25 could only be used against profits of the holiday letting business, have since the abolition of that regime in April 2025 been carried into the ordinary property business and are available against its profits.
Difference four: no carry-back, no early years relief, no terminal relief, no set-off against gains
A new trader can carry a loss from the first four tax years back against the general income of the three years before. A trader closing down can carry a final-year loss back against the trading profits of the previous three years. A trader can extend a loss relief claim to capital gains. A landlord has none of these. A heavy refurbishment in the first year of a new letting business, or in the last year before a sale, produces a loss that can only go forward.
Difference five: stop letting, or incorporate, and the loss is gone
Because a property loss is relieved only against later profits of the same business, it cannot be carried forward once that business has ceased, and HMRC's manual says so plainly. Selling the last property ends the business. A gap between lettings may or may not, and HMRC treats that as a question of fact in each case. Incorporation is where the rule does the most damage. A sole trader who transfers a trade to a company wholly or mainly for shares can, under section 86, set carried-forward trading losses against income later received from that company, such as salary or dividends. There is no equivalent for a property business. A landlord who moves the whole portfolio into a company ends their own property business on the day of transfer, and any loss carried forward dies with it. The company does not inherit it either. Anyone modelling an incorporation should put that figure in the cost column alongside the stamp duty and the capital gains position.
Where mortgage interest fits
Residential finance costs for individual landlords are not deducted in computing the profit of the property business, so they can never create or increase a rental loss. They are relieved instead as a tax reduction at the basic rate, capped by reference to several figures, one of which is the property profit for the year after deducting any losses brought forward. A brought-forward loss therefore does two things at once: it reduces the taxable rental profit, and it can reduce the profit figure that caps the finance cost reduction, pushing some of that relief into a later year as well. Unrelieved finance costs are carried forward separately from the loss. From 2027/28, when property income gets its own rates under the Finance Act 2026, the reduction is given at the property basic rate of 22 per cent.
Companies are treated more generously
A company's UK property business loss is set first against its total profits of the same accounting period, including profits that have nothing to do with property, and can be surrendered to other group companies as group relief. What is left is carried forward and, by claim, set against total profits of later periods, in whole or in part, provided the company still carries on the property business. The claim must be made within two years after the end of the accounting period in which the loss is used, and relief is available only if the business is carried on on a commercial basis. If the company stops letting but remains a company with investment business, the unused loss becomes a management expense and survives. A company that ceases altogether keeps nothing.
An illustrative year, and the timing question
Illustrative figures, not anyone's affairs. A landlord earns GBP 70,000 from employment and has a small residential portfolio on the accruals basis. In 2026/27 rents are GBP 18,000, routine expenses GBP 4,000, and a like-for-like roof replacement, a repair, costs GBP 22,000. The property business makes a loss of GBP 8,000. There are no capital allowances, so nothing can be set against salary. In 2027/28 the business makes a profit of GBP 14,000. The loss is used automatically, leaving GBP 6,000 taxable. The landlord's salary already takes them past the higher rate threshold, so that rental income falls in the property higher rate band, and the loss is worth GBP 3,360 at 42 per cent, a year after the money was spent. A trader with the same loss would have had GBP 3,200 back against the 2026/27 salary. Now suppose the landlord had sold the portfolio in March 2027. The GBP 8,000 is lost for income tax. And because the roof was a deductible repair, section 39 of the Taxation of Chargeable Gains Act 1992 stops it being added to the base cost for capital gains, even though the deduction produced no relief. The same GBP 22,000 spent on a property being kept, in a business that will make profits, is fully relieved. Spent in the final months before a sale or an incorporation, it may be relieved nowhere.
Questions worth asking before the next large bill
Is there a property loss carried forward, and is the figure tracked separately for each property business, UK, overseas and any held in another capacity? Is anything likely to bring the business to an end, a sale of the last property, a long void, a move into a company, before the loss has been used? If a substantial repair is planned, will there be rental profits to absorb the loss it creates, and does the timing need to fit around that? For a company, have carried-forward losses been claimed within the two-year window? None of these questions is difficult. They simply need asking before the invoice arrives rather than when the return is prepared.
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This article is general information only and does not constitute tax advice. Figures and dates are current as at the date of writing; any worked example is illustrative. Always consult a qualified adviser before acting.