Landlord Tax and Insurance in the UK: Running Your Rental as a Business

If the tenancy side of your rental feels like a moving target under the Renters' Rights Act, the finance side is where a lot of small landlords are quietly losing more money — often without realising it. Section 24, Making Tax Digital, the corporate SDLT surcharge and the cover your lender demands all interact, and the wrong combination can turn a break-even portfolio into a loss-making one on paper while your bank balance says the opposite. This guide walks through landlord tax and insurance in the UK the way an experienced operator thinks about them: as a single running-the-business problem, not four unrelated admin chores.

TL;DR

• Since April 2020, individual landlords in England no longer deduct mortgage interest as an expense — under Section 24 you get a 20% basic-rate tax credit instead, per HMRC guidance. This is what makes higher-rate landlords feel taxed on turnover, not profit.
• The first £1,000 of gross rental income is tax-free under the property allowance (GOV.UK); above that you either deduct real expenses or claim the £1,000, not both.
• Making Tax Digital for Income Tax is mandatory from 6 April 2026 if your gross self-employment plus property income exceeded £50,000 in 2024/25, dropping to £30,000 from April 2027 (GOV.UK).
• From 6 April 2027, property income gets its own tax rates of 22%, 42% and 47% — 2 percentage points above the main rates — and finance-cost relief moves to 22% (HMRC/Budget 2025).
• Landlord insurance is not a legal requirement, but your buy-to-let mortgage will require buildings cover — and standard homeowner policies are void the moment a property is let.

What is Section 24 and how does it affect landlord tax?

Section 24 of the Finance (No. 2) Act 2015 is the single biggest change to landlord finances in a generation, and the one most small landlords still don't fully price in. Before April 2017, an individual landlord could deduct mortgage interest from rental income as a normal business expense. From 6 April 2020 that deduction is gone entirely — instead, HMRC calculates your tax on gross rental income minus allowable non-finance expenses, then applies a 20% tax reduction against the finance costs at Step 6 of the income tax calculation.

The mechanism matters. Because mortgage interest no longer reduces your taxable income, your rental profits are added to your salary or pension gross of interest. For a basic-rate taxpayer with a small mortgage, the 20% credit roughly matches what the old deduction gave you. For a higher-rate taxpayer with a big mortgage, it does not — the extra income can push you into the 40% band (or trigger loss of Personal Allowance above £100,000, or the High Income Child Benefit Charge above £60,000), while you only get 20% back on the interest. That is why landlords describe it as being "taxed on turnover."

One critical carve-out: Section 24 does not apply to limited companies. A company holding rental property deducts mortgage interest in full against Corporation Tax, as HMRC's guidance on rental income confirms. That single asymmetry is the engine behind the wave of buy-to-let SPV incorporations since 2017.

A worked example: how Section 24 changes the tax bill

Take a Manchester landlord — call her Sarah — with a £45,000 PAYE salary and one buy-to-let generating £14,400 a year in rent. Her mortgage interest is £7,200 and she has £1,800 of other allowable expenses (gas safety, letting fees, minor repairs).

Same rent, same interest, same repairs — roughly 55% more tax. Sarah's cash-in-hand from the property hasn't changed, but she's also crossed the higher-rate threshold, which affects everything from her Personal Savings Allowance to any child benefit. These are illustrative numbers using 2025/26 bands; your accountant should model yours, but the shape is the point.

What tax does a landlord pay on rental income?

An individual landlord in England pays Income Tax on rental profits at their marginal rate, and can use the £1,000 property allowance to keep small lettings out of Self Assessment altogether. Above £1,000 gross, you can either claim the £1,000 flat allowance or deduct real expenses — HMRC's tax-free allowances guidance is explicit that you cannot do both.

Allowable expenses, per HMRC's rental income guidance, include:

• Repairs and maintenance (a repair, not an improvement — replacing a broken boiler like-for-like is a repair; installing a new kitchen where none existed is capital).
• Letting agent, accountant and legal fees for tenancies under a year.
• Insurance premiums (buildings, contents you own, landlord liability, rent guarantee).
• Ground rents, service charges and council tax during void periods you cover.
• Gas, electrical and EPC certification costs.
• Replacement of Domestic Items Relief for like-for-like furniture and appliances.

And from 6 April 2027, HMRC has confirmed at Budget 2025 that property income will be taxed at separate rates 2 percentage points above the main bands — 22%, 42% and 47% — and the Section 24 finance-cost relief will move to the new 22% property basic rate. It's a small nudge on paper and a meaningful one at the margin, especially for higher-rate landlords already squeezed by Section 24.

When does Making Tax Digital start for landlords?

Making Tax Digital for Income Tax (MTD for IT) is the biggest administrative change since Self Assessment itself. Under HMRC's MTD for Income Tax rules, affected landlords must keep digital records, submit four quarterly updates plus a final declaration, and use MTD-compatible software — no more once-a-year spreadsheet reconciliation.

Thresholds are staggered:

Qualifying income is gross — total rents before any expenses — and it's added across all your properties plus any self-employment. Employment (PAYE) and pension income are excluded, and limited company landlords are out of scope entirely because companies file Corporation Tax, not Self Assessment. HMRC's sign-up guidance confirms that late-quarterly-update penalty points will not apply in the first tax year (2026/27) — but late payment and late final-return penalties still bite.

If you own jointly with a spouse, only your share of the rental income counts towards your personal threshold, which is one of the very few genuinely helpful quirks in the design.

Sole trader vs limited company: which structure is right for a landlord?

The standard advice — "put it in a company for the interest deduction" — is often right for a new purchase and often wrong for existing property held personally. The reason is transfer cost.

The honest test: if you're buying a new property with a significant mortgage and you're a higher-rate taxpayer, incorporation often pays for itself within a few years. If you already own the property personally with substantial equity and pregnant capital gain, transferring it into a company can trigger a Capital Gains Tax and SDLT bill that dwarfs a decade of Section 24 savings. Incorporation Relief may defer the CGT — but only if HMRC accepts you're running a genuine property business (usually meaning meaningful time commitment, not a passive one-flat portfolio). Get it modelled by an accountant before signing anything.

For a step-by-step on the compliance side of running the rental itself, see our managing rental property without a letting agent guide.

What insurance does a UK landlord actually need?

Here's the thing that surprises new landlords: there is no law requiring you to insure a rental property. As MoneyHelper sets out, buildings insurance is not compulsory — but your mortgage lender's terms almost certainly are, and every mainstream buy-to-let mortgage requires buildings cover from exchange of contracts.

A sensible landlord insurance stack looks like this:

1. Buildings insurance on a landlord policy. Not a standard homeowner policy — the moment a property is let, ordinary home insurance is typically void. You need a policy that explicitly covers letting to tenants, at rebuild cost (not market value).
2. Property owners' liability. Usually included in landlord buildings policies. Covers you if a tenant, visitor or workman is injured on the property. £2 million is the usual minimum; £5 million if you're near a public right of way or have any HMO features.
3. Contents cover for what you own. Not the tenant's belongings — theirs is their responsibility. But carpets, curtains, white goods, any furniture in a furnished let. Small ticket, worth having.
4. Rent guarantee and legal expenses (optional). Given the current 12–18 month court backlog for possession claims, rent guarantee cover has moved from nice-to-have towards essential for anyone without deep cash reserves. Read the exclusions carefully — most policies require full referencing at the start.
5. Unoccupied property clause. Almost every landlord policy voids or restricts cover if the property is empty beyond a set period (usually 30–60 days). Notify your insurer immediately when a tenancy ends.

Premiums are fully deductible against rental income as an allowable expense. For a deeper look at what's covered and how policies price risk, see our private landlord insurance guide.

Landlord insurance isn't optional in any meaningful sense — the moment a tenant moves in, your homeowner policy is worth the paper it's printed on.

Running your rental as a business: the compliance–finance overlap

The reason we treat tax, insurance and compliance as one topic is that HMRC increasingly does too. HMRC's Let Property Campaign, data-sharing with the Tenancy Deposit Schemes, and the coming property portal all feed the same picture of who owns what and whether they're declaring it. And insurers routinely require valid gas, electrical and smoke alarm certificates before paying out on liability claims — a lapsed CP12 doesn't just risk a council fine, it can void the very policy you'd rely on if something went wrong.

Practical operator points:

• Keep a single digital ledger per property from now, not from the day MTD applies to you. Even a properly-set-up spreadsheet with dated receipts scanned in beats a shoebox when HMRC or your insurer asks.
• Separate bank account per rental business. Not legally required for sole traders, but it makes MTD, accountant fees and any audit exponentially easier.
• Diary your fixed dates. Gas safety, EICR, EPC, insurance renewal, quarterly MTD updates, Self Assessment deadline. Missing any of these turns cheap admin into expensive damage limitation. Our 2026 landlord compliance checklist lays out the calendar in full.
• Model Section 24 before every remortgage. Higher interest rates hurt Section 24 landlords more than the headline number suggests, because the extra interest is only relieved at 20%.

The HMRC angle is real and getting stronger — see our analysis of the HMRC landlord compliance crackdown for what the data actually shows.

Frequently Asked Questions

Do I have to declare rental income under £1,000?

No. Under HMRC's property allowance, if your gross rental income (before any expenses) is £1,000 or less in the tax year, you do not need to tell HMRC or file a return for it. Above £1,000, you must either use the flat £1,000 allowance or deduct actual expenses — you cannot combine them.

Can I still deduct mortgage interest as a landlord in 2026?

Only indirectly. Since 6 April 2020, an individual residential landlord cannot deduct mortgage interest as an expense; instead you get a 20% basic-rate tax reduction on the interest under Section 24. Limited companies holding rental property continue to deduct interest in full against Corporation Tax. From 6 April 2027, the individual credit moves to the new 22% property basic rate.

Do I need Making Tax Digital software from April 2026?

You need it from 6 April 2026 if your gross self-employment plus property income exceeded £50,000 on your 2024/25 Self Assessment return. The threshold drops to £30,000 from April 2027 and £20,000 from April 2028. Below those thresholds you can carry on filing annual Self Assessment as normal — but voluntary sign-up is possible.

Is landlord insurance a legal requirement in the UK?

No, landlord insurance is not legally required. However, your buy-to-let mortgage lender will require buildings insurance as a condition of the loan, and standard homeowner policies almost always exclude let property. Property owners' liability cover is strongly recommended even for mortgage-free lets, because a tenant or visitor injury claim can run into six figures.

Should I set up a limited company for my rental property?

It depends on your marginal tax rate, loan-to-value, whether the property is new or already owned, and how you plan to extract profits. New purchases by higher-rate taxpayers with big mortgages often favour a limited company because mortgage interest is fully deductible. Transferring an existing personally-owned property in usually triggers CGT and SDLT that can outweigh years of tax savings — model both options with an accountant before deciding.