First-Time Landlord Tax Guide: Everything a New UK Landlord Needs to Know, in Order

Becoming a first-time landlord means stepping into the tax system at several different points, often without realising it. There is tax to budget for the day you buy, tax on the rent each year, compliance obligations that arrive whether or not you are ready, and a Capital Gains Tax bill waiting at the far end when you sell. This first time landlord tax guide walks through every stage in the order a new UK landlord actually meets it, so you can see the whole picture before you commit your deposit.

The rules have shifted significantly in recent years: the Stamp Duty surcharge rose to 5%, the furnished holiday lettings regime was abolished, Section 24 changed how mortgage interest is relieved, and Finance Act 2026 introduced separate property income tax rates from April 2027. Each section below summarises one stage, points you to the deep-dive guide that covers it in full, and flags the mistakes new landlords most often make.

Your first-year tax at a glance

Here is the new-landlord tax sequence in one view, with the headline figure or deadline for each stage. The rest of this guide takes them in turn.

Stage	The tax	Headline figure or date (2026/27)
Buying	SDLT additional-dwellings surcharge	5% on top of standard rates (England and NI)
Owning the structure	Income Tax or Corporation Tax	20/40/45% personally, or CT 19%/25% via a company
Renting	Income Tax on rental profit	Profit = rent less allowable expenses
Mortgage interest	Section 24 finance-cost reducer	20% basic-rate tax credit (rises to 22% in 2027/28)
Furnishings	Replacement of Domestic Items Relief	Like-for-like replacements only (no capital allowances)
Registering	Self Assessment	Register by 5 October after your first letting year
Compliance	Making Tax Digital for Income Tax	From £50,000 income (April 2026)
Selling	Capital Gains Tax	18% or 24%, £3,000 annual exempt amount

Buying: should you own personally or through a company?

The first tax decision comes before you complete, and it is the one that is most expensive to change later: whether to buy in your personal name or through a limited company. It affects how every pound of rent and every pound of eventual gain is taxed for as long as you hold the property.

Owning personally means rental profit is added to your other income and taxed at your marginal rate (20%, 40% or 45% in 2026/27, becoming 22%, 42% and 47% for property income from 6 April 2027 under Finance Act 2026). You are subject to the Section 24 finance-cost restriction, which caps mortgage interest relief at the basic rate. On the upside, personal ownership is simpler, and on a future sale you get the £3,000 Capital Gains Tax annual exempt amount.

Owning through a limited company means profits are charged to Corporation Tax (19% on profits up to £50,000, 25% above £250,000, with marginal relief tapering between). Companies are outside Section 24, so finance costs are deducted in full before tax. The catch is that getting money out of the company, through dividends or salary, creates a second layer of tax, and most property investment companies are taxed at the 25% main rate because the small profits rate is denied to close investment-holding companies.

There is no universal right answer. The decision turns on your tax band, how much you are borrowing, and whether you need the rental income now or are reinvesting for the long term. Our complete guide to buy-to-let limited companies works through the trade-offs, and our explainer on the 2027 property income tax rates shows how the personal-versus-company maths shifts from April 2027.

Buying: the 5% SDLT additional-dwellings surcharge

When you buy an additional residential property in England or Northern Ireland, you pay Stamp Duty Land Tax including the higher-rate surcharge for additional dwellings. That surcharge rose from 3% to 5% on 31 October 2024 (FA 2003 Schedule 4ZA), and it sits on top of the standard SDLT bands.

It catches first-time landlords by surprise because it applies even when the buy-to-let is your first investment: the property counts as "additional" because you already own or have a share in another dwelling, typically your home. There is no first-time-buyer relief for a buy-to-let.

As a worked example, on a £200,000 buy-to-let the 5% surcharge alone is £10,000, payable on top of the standard SDLT due on the purchase. That is real cash needed at completion, so build it into your deposit and fees budget rather than treating it as an afterthought. If you are buying in Scotland the equivalent is the Land and Buildings Transaction Tax with its Additional Dwelling Supplement; in Wales it is Land Transaction Tax with higher residential rates. Both differ from SDLT in their bands and percentages.

Renting: how rental income is taxed, and Section 24

Once the rent starts arriving you are liable for Income Tax on your rental profit, not the rent itself. Profit is gross rent received, less the allowable expenses of running the let. The result is added to your other income and taxed at your marginal rate.

The single biggest change for leveraged landlords is Section 24. Mortgage interest and other finance costs are no longer deducted from rental profit. Instead they are given as a basic-rate tax reducer, set at 20% for 2026/27 (ITTOIA 2005 ss.274A-274C). The relief is capped at the lower of 20% of the finance costs, 20% of the residential rental profit, and 20% of your income above the personal allowance; any restricted amount carries forward.

Here is what that means for a higher-rate (40%) taxpayer with £10,000 of annual mortgage interest:

• Old system: a £10,000 deduction saved £4,000 in tax.
• Current system: £10,000 produces a £2,000 tax credit (20%), saving only £2,000.
• Net cost: roughly £2,000 of extra tax a year, simply from the change in how relief is given.

This is why highly geared buy-to-let is far less tax-efficient for higher-rate taxpayers than it once was, and why so many new landlords run the company-versus-personal comparison above. Our complete Section 24 guide sets out the three-part cap and the planning options, and if you want the income side in isolation, see how much tax you pay on rental income.

Renting: allowable expenses and Replacement of Domestic Items Relief

Claiming the right expenses is where new landlords most often leave money on the table or, worse, claim something they should not. The gateway question is always whether a cost is revenue (deductible against this year's profit) or capital (not a revenue deduction, but usually relevant to the eventual Capital Gains Tax calculation).

Revenue expenses you can deduct include:

• Repairs and maintenance, but not improvements
• Buildings and contents insurance
• Letting agent and management fees
• Accountancy fees and certain legal costs (for example, renewing a short lease or chasing rent)
• Ground rent, service charges and advertising for tenants
• Safety certificates: gas, electrical and EPC

Capital expenses, which are not revenue deductions, include:

• Property improvements and renovations that go beyond restoring the original condition
• Legal and survey fees relating to the purchase itself
• Major structural works

The repair-versus-improvement line trips people up constantly. Fixing a broken boiler is a repair (deductible). Ripping out a kitchen and fitting a higher-specification one is an improvement (capital). Replacing like with like is usually a repair; upgrading is usually an improvement.

Furniture and appliances: no capital allowances, use RDIR instead

A common and costly myth is that a landlord can claim capital allowances on furniture, white goods or carpets in a let dwelling. They cannot. The CAA 2001 s.35 dwelling-house bar blocks plant and machinery allowances for items provided for use in an ordinary residential dwelling, and the abolition of the furnished holiday lettings regime on 6 April 2025 closed the route that used to exist for FHL properties.

The correct relief is Replacement of Domestic Items Relief (ITTOIA 2005 s.311A). It works like this: the first time you buy a domestic item for the let, there is no relief; when you later replace it, you can deduct the cost of a reasonable like-for-like replacement against rental income. So if you replace a worn-out £400 sofa with a similar £450 sofa, you claim the cost of an equivalent replacement; any genuine upgrade beyond a modern equivalent is stripped out, and any proceeds from disposing of the old item reduce the claim. Our dedicated guide to Replacement of Domestic Items Relief walks through the conditions, and our complete list of landlord tax deductions covers every allowable expense in detail.

Do not forget pre-letting costs either. Expenses incurred in the period before your first tenant, such as initial repairs, decorating and the cost of setting up the letting, are often treated as incurred on the first day of the business and become deductible once you start letting. Keep records from the moment you start viewing investment properties.

The £1,000 property allowance and when you must declare

Not every landlord has to file a return. The £1,000 property allowance means that if your total gross rental income for the year is £1,000 or less, you usually have nothing to declare. Cross that threshold and you must tell HMRC and report the income through Self Assessment.

Where your income is comfortably above £1,000, you generally claim your actual allowable expenses rather than the property allowance, because the expenses are worth more. The allowance is most useful for very small or occasional rental income. Once you are in Self Assessment, see our step-by-step guide to completing a landlord Self Assessment return.

Selling: Capital Gains Tax on exit

Even on day one it is worth understanding the tax that waits at the end, because decisions you make now (how you own the property, whether your spouse is on the title) shape the bill years later.

Residential property gains are charged at 18% where they fall within your unused basic-rate band and 24% above it (TCGA 1992 s.1H, from 30 October 2024). The rate applies to the gain, not the sale price: you deduct your purchase price, buying and selling costs, and capital improvements first. Each individual then has a £3,000 annual exempt amount for 2026/27. A property held jointly by a couple uses both £3,000 allowances, so £6,000 of gain is tax-free between them; that is two separate £3,000 allowances, not a single £6,000 joint allowance.

Two reliefs are worth knowing about at the outset:

• Private Residence Relief (PRR): if the property was ever your main home, the period you lived there plus the final 9 months of ownership are exempt (TCGA 1992 ss.222-226). If you lived in a property for 2 years then let it for 8 before selling, roughly 2/10 of the gain (plus the final-9-months uplift) is sheltered by PRR.
• Spousal transfers: transfers between spouses and civil partners are on a no-gain, no-loss basis (TCGA 1992 s.58), so moving a share to a lower-rate spouse before sale can use a second £3,000 allowance and a second basic-rate band.

Lettings Relief is not what most landlords think. Since 6 April 2020 it is available only where you shared occupation of the property with your tenant, so for an ordinary buy-to-let where you never lived alongside the tenant, it does not apply. Where CGT is due, you usually have to report and pay it within 60 days of completion. Our deep dives on the current CGT rates on property, the £3,000 annual exempt amount, and PRR for landlords set out the planning in full.

Compliance: Making Tax Digital for Income Tax

Making Tax Digital for Income Tax (MTD for ITSA) is now live and phasing in by income level. You are mandated to keep digital records and send quarterly updates to HMRC once your combined gross self-employment and property income reaches the threshold:

• £50,000 from 6 April 2026
• £30,000 from 6 April 2027
• £20,000 from 6 April 2028

A few points matter for landlords specifically. Joint owners test the threshold against their own share of the gross rental income, not the property's total. Limited companies are outside MTD for ITSA entirely; they report through the Corporation Tax return. And the regime carries a points-based late-submission penalty, so quarterly discipline matters from the start. Because the threshold keeps falling, even landlords currently below it should set up digital records early. Our Making Tax Digital guide for landlords covers the software and quarterly-update process.

Compliance: Self Assessment registration and payment dates

If you are not within MTD, you report rental income through the annual Self Assessment return, and the deadlines are unforgiving.

You must register for Self Assessment by 5 October following the end of the tax year in which you first had rental income to declare. Start letting in January 2026 (the 2025/26 tax year) and the registration deadline is 5 October 2026. Miss it and you risk a failure-to-notify penalty.

The key payment dates are:

• 31 October: deadline for a paper return, where still accepted.
• 31 January: deadline for the online return and payment of the tax due for the year just ended.
• 31 July: second payment on account, where one is due.

New landlords are often caught out by payments on account. If your bill exceeds £1,000, HMRC asks for advance payments towards next year's liability, each equal to 50% of the previous year's tax, due on 31 January and 31 July. That makes the first 31 January heavy: the balancing payment for last year and the first payment on account for the year ahead can fall together.

April 2027: what actually changes

From 6 April 2027, Finance Act 2026 (Royal Assent 18 March 2026, ss.6-7) introduces separate property income tax rates of 22% (basic), 42% (higher) and 47% (additional). These apply to property income in England, Wales and Northern Ireland; only Scotland is carved out, with Scottish taxpayers paying the rates set at Holyrood. This is enacted law, not a proposal.

The part the headlines miss is that the Section 24 finance-cost reducer rises in step. Finance Act 2026 Schedule 1 sets the reducer at the new property basic rate of 22% from 2027/28 (amending the individual landlord's finance-cost reducer in ITTOIA 2005 s.274AA, with the parallel property-partnership reducer in ITA 2007 s.399B), rather than freezing it at 20%. The consequences are precise:

• For a basic-rate landlord, the 22% reducer matches the 22% rate on property income, so no new basic-rate wedge opens from this change.
• For higher and additional-rate landlords, the reducer rises from 20% to 22% exactly in step with the 2 point rate rise, so the finance-cost gap stays the same rather than widening: the higher-rate wedge is unchanged at 20 points (42% rate less 22% reducer, the same as 40% less 20%) and the additional-rate wedge is unchanged at 25 points (47% less 22%, the same as 45% less 20%).

The 22/42/47 rates are 2 percentage points above the general Income Tax rates, so a higher-income landlord pays modestly more on rental profit, but the often-repeated claim that the change opens a damaging new mortgage-interest wedge is wrong. Our pillar on the 2027 property income tax rates models the figures, and the landlord tax changes guide sets the reform alongside everything else that has moved.

First-year mistakes new landlords make

Most first-year tax problems come from a short list of avoidable errors:

• The wrong ownership structure: buying personally when a company would have suited a long-term, highly geared plan, or vice versa, and then finding the switch triggers SDLT and CGT.
• Forgetting the 5% SDLT surcharge: budgeting only for standard SDLT and being short of cash at completion.
• The capital-allowances myth: assuming furniture and appliances attract capital allowances; they do not in a residential let, so use Replacement of Domestic Items Relief instead.
• Misclassifying repairs as improvements (or the reverse): the wrong call either inflates a CGT cost base or over-claims a revenue deduction.
• Late Self Assessment registration: missing the 5 October deadline and incurring a penalty.
• Ignoring spousal planning: not using a lower-rate spouse's allowances and rate bands on income or on a future sale.

Getting professional support and your next steps

Property taxation rewards getting the structure and the records right from day one, because the costly errors (wrong ownership, missed reliefs, classification mistakes) are the hardest to unwind later. It is worth taking advice early if you are a higher-rate taxpayer affected by Section 24, weighing up incorporation, planning multiple purchases, approaching the £100,000 personal-allowance taper, or facing significant refurbishment work.

A specialist property accountant understands the buy-to-let lifecycle from purchase to exit and can keep your affairs efficient and compliant from the outset. Our guide on what a property accountant does explains the services involved. With the structure decided, the surcharge budgeted, your records set up digitally, and the registration and payment dates in your calendar, you have the foundation to grow your portfolio with confidence rather than firefighting your tax position after the fact.