Landlord Tax Guide: Tax on Rental Income Explained

Landlord tax is income tax charged on your rental profit, not on the rent you collect. Profit is your total rent minus allowable expenses. That figure is added to your other income and taxed at your normal rate. Reporting to HMRC normally happens through a self assessment tax return.

Two landlords can collect exactly the same rent and end up with very different tax bills. Landlord tax isn’t a separate tax with its own rate, so what you owe depends on everything else you earn, what you’re allowed to deduct, and which part of the UK you live in.

The rules have shifted a fair bit too. Mortgage interest stopped being a straightforward expense, the separate regime for furnished holiday lets was scrapped, and quarterly digital reporting has started phasing in.

If you last read up on this a few years ago, some of what you remember may no longer apply.

What follows covers how rental profit is worked out, which costs genuinely qualify, where repairs stop and improvements start, what happens in a loss-making year, and how to register and file. Every figure quoted is tied to a tax year, because these numbers move each April.

Landlord tax applies to profit, not rent

Rent isn’t profit, and it’s the profit HMRC taxes. Add up all the rent received in the tax year, deduct your allowable expenses, and what’s left is the taxable figure.

GOV.UK’s guidance on working out your rental income confirms that letting several places doesn’t mean several separate calculations. Everything you let in the UK is pooled into one property business carrying a single profit or loss figure. Property abroad is the exception and sits in a calculation of its own.

The tax year runs from 6 April to 5 April, so preparing your rental accounts to 5 April each year keeps the numbers lining up with the return.

Your rental profit then stacks on top of your other income. If you’re employed, it’s added to your salary, which is why tax on rental income while working full time can land at a higher rate than expected.

Depending on your total, one year’s rental profit can be taxed partly at one rate and partly at the next one up.

For England, Wales and Northern Ireland in 2026/27, income above your personal allowance is taxed at 20%, then 40%, then 45%. Scotland runs a different set of bands, covered further down.

So do landlords pay tax on rent or profit? Profit, every time. And do I need to declare rental income at all? Usually yes, though a small allowance sits underneath the reporting requirement.

How much rental income is tax free comes down to the property income allowance. GOV.UK’s guidance on tax-free allowances on property and trading income sets this at £1,000 of gross property income for 2026/27.

Where your rent for the year comes to that or less, the allowance applies on its own and there’s generally nothing to tell HMRC and no return to file for it.

Above £1,000, you can choose to deduct the allowance instead of your actual expenses, whichever leaves you better off.

One trap worth knowing: HMRC’s property income manual states the rental income tax allowance isn’t available in any year where the residential finance cost reduction is applied. Mortgaged landlords generally can’t claim both.

What expenses can landlords claim?

HMRC’s test is that a cost must be incurred wholly and exclusively for the property rental business. Personal spending doesn’t count, and where something serves both purposes you claim only the business proportion.

Day-to-day running costs that normally qualify as landlord allowable expenses include:

• Letting agent and property management fees.
• Gas and electrical safety checks, along with routine maintenance.
• Landlord insurance, covering buildings, contents and liability.
• Professional fees, for example accountancy for the rental accounts and legal work on tenancy agreements.
• Ground rent and service charges on a leasehold property.
• Council tax and utility bills in any period you pay them rather than the tenant.
• Vehicle running costs, restricted to the proportion of travel that relates to the letting business.

Tax deductible expenses for landlords stretch further than the obvious repair bill. Safety certificates, agent renewal fees and the drive out to meet a contractor all count.

Keep the paperwork, because HMRC expects records behind every figure on the return.

Mortgage interest is a credit, not a deduction

This is where the rules changed most, and where returns most often go wrong. Interest on a residential buy to let used to come straight off rental income as an expense.

That relief was phased out between April 2017 and April 2020 and is now given as a basic rate tax reduction instead, as the guide to mortgage interest tax relief sets out in more detail.

The reduction is worth 20% of the lowest of three figures: your finance costs, your property profits, and your adjusted total income.

Because it reduces the tax bill rather than the profit, higher and additional rate taxpayers get less relief than the old system gave them.

On the return, the interest goes in box 44 of the SA105 property pages, labelled residential property finance costs. Anything left over from an earlier year goes in box 45, which the form labels unused residential property finance costs brought forward.

HMRC’s notes to the property pages confirm that a balance you can’t use in one year isn’t lost, and stays available against later years of the same property business.

Repairs are deductible, improvements are not

Every landlord meets this line eventually. Fix something and it’s a repair, deducted from this year’s rental profit.

Upgrade it and it’s an improvement, which is capital spending. Capital doesn’t reduce rental profit, though it usually increases the base cost used when calculating capital gains tax on a sale.

HMRC’s property income manual treats the repairs vs improvements landlord tax question as one of fact and degree in each case, so there’s no fixed list to check against. The manual makes one point that helps: using modern materials doesn’t automatically create an improvement.

Where the new material is broadly equivalent to the original, replacing like with like is still a repair, even though the replacement is better made.

Furniture and appliances follow a separate route. Replacement of domestic items relief allows a deduction for replacing beds, sofas, carpets, curtains, white goods and similar items, provided four conditions in HMRC’s guidance are met.

It applies to replacements only and never to the initial purchase, and the claim is capped at the cost of a like-for-like modern equivalent.

Swap a basic fridge for a high-specification one and you claim what the basic model would cost today, not the full invoice.

Losses carry forward against future rental profit

Rental businesses lose money sometimes, particularly in a year with a major repair or a long void. That loss isn’t wasted.

HMRC’s guidance sets the general rule, and it works in your favour: a loss rolls forward on its own and lands against the next year’s profits from the same business. No claim is needed to make that happen, but the loss still needs reporting on your return so it’s on record for later.

What you generally cannot do is set a rental loss against your salary, pension or self employment profits. Property is ring-fenced as its own business, which the FAQ on offsetting rental losses against other income explains.

A narrow exception exists, limited by HMRC’s manual to losses attributable to certain capital allowances or certain agricultural expenses.

Neither route opens on an ordinary residential let unless one of those is in play, which leaves carrying the loss forward as the practical answer.

Where you let more than one property, they’re already pooled into a single property business. A loss on one is netted against profit from another before any carry forward comes into it.

Registering and filing your landlord tax return

First time landlord tax duties start with telling HMRC you exist. Registration for self assessment falls due on the 5 October that follows your first tax year with rental income to report. Miss that date and a failure to notify penalty can follow, even if you go on to file and pay on time.

Knowing how to register as a landlord for self assessment is simple enough.

If you’re not self employed, form SA1 is the one, completed online through a Government Gateway account or printed and posted. HMRC then issues a Unique Taxpayer Reference by post, which takes several working days, so don’t leave it to late January.

Already have a dormant self assessment record from a previous year? That can be reactivated rather than started again.

Declaring rental income to HMRC then happens through the SA100 main return plus the SA105 UK property pages. Where a property is jointly owned you report only your share, and the return has to include your other income too.

Payment falls due by 31 January after the tax year ends. If your bill passed a certain level the year before, HMRC will also ask for payments on account, which are advance instalments towards the following year. Interest runs on anything paid late.

Letting from abroad changes the picture. You’d be classed as a non resident landlord, with additional return pages and the non resident landlord scheme to deal with, set out in the non resident landlord tax guide.

Making Tax Digital for Income Tax has now begun. GOV.UK’s eligibility guidance sets the entry points by qualifying income, meaning gross rent plus any self employment turnover, measured before expenses. Landlords above £50,000 for the 2024/25 tax year came into the regime from 6 April 2026.

The threshold falls to £30,000 based on 2025/26 income, then £20,000 based on 2026/27 income. Once you’re in, you keep digital records and send quarterly updates through compatible software, with a final declaration replacing the single annual return.

The Making Tax Digital for landlords guide covers what that means in practice.

Scottish rates change your landlord tax bill

Rental profit counts as non-savings, non-dividend income, and that’s precisely the category the Scottish Parliament sets rates for. If your main home is in Scotland, landlord tax in Scotland rules apply and your tax code should carry an S prefix.

The Scottish Government’s published rates for 2026/27 use six bands where the rest of the UK uses three: a starter rate of 19%, a basic rate of 20%, an intermediate rate of 21%, a higher rate of 42%, an advanced rate of 45% and a top rate of 48%. The higher rate also begins at a lower income than the equivalent threshold elsewhere in the UK.

For rental income tax Scotland purposes, the practical effect is that identical rental profit can produce a different bill depending on which side of the border the landlord lives.

The personal allowance is the same UK-wide, and so are the property income allowance and the finance cost reduction, since those are reserved rather than devolved. Savings interest and dividends also stay on UK-wide rates.

It’s the rate applied to your rental profit that changes, not the reliefs.

Before you file your landlord tax return

Landlord tax comes down to a short sequence done in the right order: work out the profit, deduct only what genuinely qualifies, keep repairs and improvements in their separate boxes, and file on time.

The mortgage interest treatment deserves particular attention, because a figure entered in the expenses boxes instead of box 44 produces the wrong answer.

Check the current year’s rates and thresholds before calculating anything, since figures move each April and the Scottish bands move on their own timetable. If a sale is on the horizon rather than a letting year, the capital gains tax guide for landlords covers that side separately.

Key takeaways

The points worth carrying away from this landlord tax guide:

• Landlord tax is income tax on rental profit, so your other income determines the rate applied to it.
• Allowable expenses must be incurred wholly and exclusively for the letting business, and mixed-use costs are claimed only in proportion.
• Mortgage interest on a residential let gives a 20% basic rate tax reduction through box 44, rather than a deduction from profit.
• Repairs reduce this year’s rental profit, while improvements are capital and instead affect capital gains tax on a future sale.
• Rental losses carry forward automatically against future profits of the same property business, and only rarely go against other income.
• Registration is due by 5 October after the tax year in which rent was first received, with payment due the following 31 January.

Common landlord tax questions

The answers below follow HMRC’s published guidance on property income and allowable expenses.

Is a new boiler tax deductible for landlords?

A straight swap of a broken or worn-out boiler for a comparable modern equivalent is normally treated as a repair to the property, which comes off rental profit in the year the cost is incurred. HMRC’s approach accepts that a new boiler will inevitably be more efficient than a decades-old unit, and that improvement on its own doesn’t turn the spending into capital.

Capital treatment needs more than a better boiler. Putting central heating into a property that never had it is an improvement rather than a restoration, because there was nothing there to restore. That cost won’t reduce rental profit, though it does add to the base cost when capital gains tax is worked out on a future sale.

A boiler is a fixture rather than a domestic item, so replacement of domestic items relief doesn’t reach it. The repairs and improvements distinction is the one that decides the answer.

Is a new kitchen tax deductible, and are replacement windows an allowable expense?

Timing changes this answer more than the item does. A kitchen fitted partway through a letting, replacing units that were worn out, normally counts as a repair and reduces that year’s rental profit.

Fit the same kitchen before the first tenant arrives and the treatment can flip. Where a property was bought in poor condition and the purchase price reflected that condition, HMRC generally treats the work needed to bring it up to a lettable standard as capital rather than as a repair. The cost then waits until sale and reduces the capital gain instead. A property that was already lettable and simply got freshened up before marketing doesn’t fall into that.

Windows sit under both tests. Swapping rotten single-glazed frames for modern double glazing during a letting is generally accepted as a repair, on the basis that double glazing is the current equivalent of what was there rather than a functional upgrade. Do the same job as part of bringing a run-down purchase up to standard and it follows the acquisition rule instead. Whether replacement windows are an allowable expense therefore depends on what was done and on when it was done.

Can landlords claim mileage?

Travel between your home and a let property is claimable, within limits. GOV.UK’s guidance on working out rental income lists vehicle running costs among deductible expenses, restricted to the proportion used for the rental business, and refers to mileage rate deductions as one way of calculating them.

The wholly and exclusively test still governs it. Driving to a property to meet a contractor, carry out an inspection or hand over keys is business travel. Folding a personal errand into the same trip, or making the journey largely to look at an investment you enjoy visiting, weakens the claim. A simple log of dates, destinations and purpose is what makes one defensible.

Two methods exist: actual running costs apportioned to business use, or a flat rate for each business mile. Pick one and stay consistent. Check the current approved mileage rate on GOV.UK before calculating anything, since the published figures differ by vehicle and change between tax years.

Is landlord insurance tax deductible?

Premiums for policies taken out for the letting business are allowable expenses, and that covers buildings insurance, contents insurance where furnishings are provided, landlord liability cover, and add-ons such as rent guarantee or legal expenses cover.

The line to watch runs between insuring the business and insuring yourself. Life assurance and other personal policies aren’t deductible against rental income, however sensible holding them might be.

Where a policy covers a property you also occupy for part of the year, or covers several properties of which only some are let, only the proportion relating to the letting is claimable. Apportion it on a basis you could explain to HMRC if asked.

Can I claim council tax on void periods?

Council tax falling in a void is claimable, provided you’re the one paying it and the property remains part of a live rental business. The bill is normally the tenant’s responsibility, but during a void it falls back to the landlord, and at that point it becomes a cost of running the business.

The condition attached is that the property stays genuinely available for letting and the business continues. Costs falling in a temporary gap between tenancies follow the same rules as costs during a tenancy, and utilities paid across the void are treated the same way.

Where this stops working is once the rental business has effectively ended. HMRC’s position is that expenses incurred after the business ceases, for example while an empty property waits to be sold, aren’t wholly and exclusively for the letting business and can’t be set against rental income.