Rent a Room Scheme Calculator

What the Rent a Room scheme actually is

If you let a furnished room in your own home, the Rent a Room scheme lets you earn up to £7,500 a year completely free of income tax. Our rent a room scheme calculator takes the rent you receive, weighs it against this allowance and against the usual rent-minus-expenses method, and tells you which route leaves you better off and whether you even need to mention it on a tax return at all. For a lot of people the answer is reassuringly simple: you owe nothing and you do not have to file anything.

The scheme has been around since the 1990s and it is genuinely one of the most generous reliefs in the UK tax system. The whole point of it is to encourage people to take in lodgers without drowning them in paperwork. So if you have a spare room and you are thinking about renting it out, this is usually the first thing to understand before you do anything else.

Who the scheme affects and who can use it

The Rent a Room scheme is for people who let furnished accommodation in the home they themselves live in. That is the key test. You can be a homeowner or you can be a tenant yourself (as long as your own tenancy agreement allows you to sublet a room). What matters is that the room is part of your main residence and that it is furnished.

You can use the scheme if you:

• let a furnished room to a lodger in your own home
• run a small bed and breakfast or guest house from your home
• take in a lodger and also provide meals, cleaning or laundry as part of the deal

You cannot use the scheme if:

• the accommodation is not part of your own home, for example a separate flat that has been converted and has its own entrance and is treated as self-contained
• you let the whole property while you live somewhere else
• the room is let unfurnished
• you use the room as an office or for business by your lodger rather than as living accommodation

This is where people often trip up. If you move out and rent your old home to a tenant, that is normal property letting, not the Rent a Room scheme, and you would be looking at the rental income tax calculator instead. The scheme is specifically about sharing the home you live in.

Lodgers versus tenants: why the difference matters

A lodger lives in your home and shares space with you. A tenant usually has exclusive use of a self-contained property. The Rent a Room scheme is built around lodgers, and the distinction also affects your legal rights to ask someone to leave, which is generally far simpler with a lodger than with an assured shorthold tenant. If you are letting to a lodger who shares your kitchen or bathroom, you are almost certainly in Rent a Room territory.

How the scheme works with real 2026/27 figures

For the 2026/27 tax year the tax-free threshold is £7,500. If more than one person receives income from letting rooms in the same property, for example you and your partner or you and a joint owner, the allowance is halved to £3,750 each. It does not matter how many rooms you let or how many lodgers you have. The figure is per property, not per room.

The way it works depends on whether your gross receipts (the total rent before you take off any costs) are above or below the threshold.

If your gross rent is £7,500 or less: the income is automatically exempt. You do not have to do anything. You do not need to tell HMRC, you do not need to file a tax return just for this, and you owe nothing. This is the case for the majority of live-in landlords.

If your gross rent is more than £7,500: you have a choice, and this is where the calculator earns its keep. You can either:

• Method A: pay tax on everything above £7,500, with no deduction for expenses. So you take your total rent, subtract £7,500, and the rest is taxable.
• Method B (the normal method): ignore the scheme entirely and pay tax on your actual profit, which is rent minus allowable expenses such as a share of utilities, insurance, repairs and wear on furniture.

You pick whichever gives the lower tax bill. HMRC genuinely lets you choose, and you can switch year to year depending on what suits you. The Rent a Room scheme calculator on this page runs both methods side by side so you can see the difference in pounds rather than guessing.

Worked example one: Sarah and a single lodger

Sarah owns her home and lets her spare room to a lodger for £550 a month, which is £6,600 a year. Because that is below £7,500, the income is automatically exempt. Sarah pays no tax on it, does not need to register for Self Assessment because of it, and does not need to keep detailed expense records. The relief does the work quietly in the background.

Now imagine Sarah is also employed and already files a tax return for another reason. Even then she simply does not include the lodger income, because it falls under the exempt threshold. If you want to sense-check your overall position alongside your salary, the income tax calculator and the take-home pay calculator are useful companions.

Worked example two: James earns more than the threshold

James lets two rooms in his home and receives £11,000 in rent over the year. His allowable expenses (a share of gas, electricity, water, insurance and some furniture replacement) come to £2,000.

Method A (Rent a Room): £11,000 minus £7,500 = £3,500 taxable. As a basic rate taxpayer at 20 per cent, James would pay £700 in tax.

Method B (normal): £11,000 minus £2,000 expenses = £9,000 taxable profit. At 20 per cent that is £1,800 in tax.

Method A wins comfortably here, saving James £1,100. He would tick the Rent a Room box on his Self Assessment return and pay tax on £3,500. But notice the logic flips if expenses are very high. If James had a major repair year and his costs were £8,500, the normal method would leave only £2,500 taxable and would beat the scheme. That is exactly the comparison the calculator handles for you, and it is why you should not assume the scheme is always best.

If you are a higher rate taxpayer, the same income could be taxed at 40 per cent, so the stakes are larger. It is worth seeing whether the extra income pushes you near a threshold by checking the 60 percent tax trap calculator if your total earnings are near £100,000.

When you must report it on Self Assessment

This is the question that worries people most, so let me be clear and calm about it.

• If your gross rent is £7,500 or less (or £3,750 or less when shared): you do not need to report it at all, and you do not need to file a return just because of the lodger.
• If your gross rent is more than £7,500 and you want to use the scheme: you do need to tell HMRC, file a Self Assessment return, and claim the exemption on the property pages.
• If you choose the normal method: you report the income and expenses on the property section of the return in the usual way.

If you are not sure whether a return is needed for any other reason, our do I need to file a tax return tool walks you through it. And if you do need to register, keep the guide to Self Assessment deadlines handy so you are not caught out: the online filing deadline is 31 January after the end of the tax year, and the self assessment penalty calculator shows what late filing actually costs if you slip.

One reassuring point from real experience: HMRC is not waiting to pounce on the typical lodger arrangement. The scheme exists precisely so that ordinary live-in landlords stay outside the Self Assessment net. The penalties people fear almost always come from missing a return you were already required to file, not from a modest lodger sitting below the threshold.

Common mistakes people make

After years of seeing these arrangements, the same errors come up again and again.

• Confusing gross with net. The £7,500 test is on gross rent received, not your profit after expenses. If you collect £8,000 and spend £1,000 on bills, you are still over the threshold and need to make a choice, even though your profit is only £7,000.
• Forgetting the £3,750 split. Couples often assume they each get £7,500. If you both receive the income from the same property, you share one allowance, so it is £3,750 each.
• Using the scheme for a property you do not live in. This is the big one. Renting out a whole flat you own elsewhere is not Rent a Room. That is ordinary rental income, and if you have a mortgage on it you also need to think about mortgage interest relief restrictions and our buy-to-let profit calculator.
• Letting the room unfurnished. The scheme only applies to furnished lettings. An unfurnished room does not qualify.
• Assuming the scheme is always better. When expenses are high relative to rent, the normal method can win. Always compare both.
• Ignoring other rules. Renting a room can affect things like Council Tax single person discount and your mortgage or insurance terms, so check those separately with the council tax calculator and your lender.

How to use this rent a room scheme calculator

The tool is designed to answer the practical question in under a minute.

• Enter the total rent you receive (or expect to receive) in the tax year, before any deductions.
• Tell it whether you are the only person receiving the income or sharing it, so it applies £7,500 or £3,750.
• Add your allowable expenses if you have them, so it can run the normal method too.
• Enter your other income or tax rate so it can estimate the actual tax under each method.

The calculator then shows you three things: whether you are exempt automatically, how much tax you would pay under Method A and Method B, and which one to choose. It is an estimate to guide your decision, not a substitute for completing your return accurately.

Your next steps

If you are below the threshold, relax, there is nothing to do beyond keeping a simple record of the rent in case anything changes. If you are above it, run both methods here, pick the cheaper one, and diarise the 31 January filing deadline. Before you commit, read the official guidance so you are confident in your figures: HMRC sets out the rules in plain terms at gov.uk on renting a room in your home, and the detailed HS223 helpsheet covers the trickier cases. For anything that touches your wider tax picture you can also browse gov.uk directly.

If your lodger income sits alongside self-employment or a side income, it is worth seeing the whole picture with the self assessment tax calculator and the side hustle tax calculator.

A quick disclaimer: the figures above are for the 2026/27 tax year and are intended as general guidance. Tax depends on your own circumstances, so check your specific situation with HMRC or a qualified accountant before you file. Allowances and thresholds can change, and your personal position may differ from the examples here.