Should You Incorporate Your Buy-to-Let in 2026? The Numbers After the Autumn Budget

If you have been asking yourself should I incorporate buy to let 2026, you are not alone. The Autumn Budget added a new 2-percentage-point surcharge on property income from April 2027, the Section 24 mortgage interest restriction has been baked in since April 2020, and the Stamp Duty additional-dwelling surcharge jumped from 3% to 5% on 31 October 2024. Each of those nudges the maths a little further in favour of a limited company — but only for some landlords, and not the ones the louder corners of property Twitter would have you believe.

The honest answer is that incorporation is rarely a single-issue decision. It is a trade between an immediate Stamp Duty and Capital Gains Tax bill, ongoing accountancy and mortgage-rate premiums, and a longer-term reduction in effective tax rate once your portfolio is paying corporation tax at 19% or 25% rather than your personal 40% or 45% marginal rate. After the 2025 Budget, that long-term gap widened — but the upfront cost to get there widened too.

This guide walks through the post-Budget numbers using a worked example (a £60,000 gross rent, 75% LTV portfolio), unpacks Section 162 incorporation relief, flags the HMRC Spotlights you must avoid, and gives a decision matrix you can take to your accountant. We will not pretend this is tax advice — it is not, and the disclaimer at the bottom of this article is not boilerplate. But by the time you finish reading you will know which questions to ask, what evidence to gather, and roughly where you sit on the incorporation spectrum.

What changed at the Autumn Budget 2025

The headline announcement for landlords was a new 2-percentage-point surcharge on property income, applying from 6 April 2027. In practice that means rental profits will be taxed at 22%, 42% and 47% (instead of 20%, 40% and 45%) inside your personal Self Assessment. Employment income, pensions and dividends are unaffected — this is a rent-only levy, and it sits on top of the Section 24 regime that has restricted mortgage interest relief to a 20% basic-rate tax credit since 6 April 2020. HMRC's own Property Income Manual confirms the credit rate, and the Budget Red Book confirms it will rise to 22% from April 2027 to keep symmetry with the new headline rate.

Capital Gains Tax on residential property was rebased in the October 2024 Budget to 18% (basic-rate band) and 24% (higher-rate band), with the Annual Exempt Amount stuck at £3,000 and the 60-day reporting deadline unchanged. Lettings Relief has been shared-occupancy only since 6 April 2020, so most accidental landlords cannot rely on it. Stamp Duty Land Tax for residential transactions in England and Northern Ireland reverted to a £125,000 nil-rate threshold on 1 April 2025, and the additional-dwelling surcharge on second properties and corporate purchases rose from 3% to 5% on 31 October 2024. For a landlord moving a £300,000 buy-to-let into a limited company without incorporation relief, that surcharge alone is £15,000.

Corporation tax remains 19% for small profits up to £50,000, 25% for profits above £250,000, and marginal relief in between. Crucially, a pure buy-to-let SPV is normally a Close Investment Holding Company (CIHC) and so pays the 25% main rate flat — there is no small-profits rate for landlords. The dividend allowance is £500 (halved from £1,000 in 2024), with dividend tax at 8.75% / 33.75% / 39.35%. Read our Landlord Tax Changes April 2026 Round-Up for the broader picture.

The core trade-off in one paragraph

Personal ownership taxes your gross rent (minus allowable cash expenses) at your marginal rate, with mortgage interest only relieved as a 20% tax credit. A limited company taxes profit (including full mortgage interest as a deduction) at 19%/25%, but money you actually take out is taxed again as a dividend or salary. Incorporation wins when (a) you are a higher-rate or additional-rate taxpayer, (b) you carry significant mortgage debt so Section 24 hurts, and (c) you are reinvesting rather than drawing the rent for personal living costs. It loses when you need every penny of rent in your back pocket, because the dividend tax claws back most of the corporation-tax saving on the way out.

Worked example: £60k rent, 75% LTV portfolio

Take a portfolio of four properties worth £1,000,000 in aggregate, geared at 75% LTV (£750,000 mortgage debt) at a 5.5% blended interest rate (so £41,250 of annual interest). Gross rent is £60,000, repairs and management £6,000, leaving accounting profit of £12,750. We will assume the landlord is a higher-rate taxpayer with other income that already uses the personal allowance and basic-rate band. The numbers below are post-Budget, using April 2027 rates to show the steady state.

Even after dividend tax, the SPV leaves the higher-rate landlord roughly £7,400 better off per year on this profile — and that swings further in favour of the SPV if profit is rolled up and used to deleverage or buy the next property rather than extracted. Run your own numbers with our Section 24 tax comparison tool and cross-check against the income tax calculator before committing.

Section 162 incorporation relief: the CGT escape hatch

The biggest upfront cost of moving a personally-held portfolio into a company is Capital Gains Tax on the disposal — every property is deemed sold at market value to the company. At 24% on the higher-rate band that can easily eat 5–6 years of tax savings. Section 162 TCGA 1992 allows that gain to be rolled over into the value of the shares you receive, deferring the CGT until you eventually sell the shares. The catch: the activity transferred must be a 'business', not mere investment.

The leading authority is Ramsay v HMRC [2013] UKUT 226 (TCC), which set a multi-factor test. HMRC's internal guidance at CG65715 uses an informal benchmark of around 20 hours per week of personal active involvement, and looks at the number of properties, the degree of management activity, the type of services provided, and whether the landlord employs others or contracts work out. A landlord with two flats managed by a letting agent will not qualify. A full-time hands-on landlord with 15+ units, doing their own viewings, repairs management, accounts and tenant liaison, has a credible case. HMRC will not give you a pre-transaction ruling — you do the deal, file the return claiming the relief, and hope they do not open an enquiry within the four-year window.

Section 162 relief is also subject to the SDLT trap. The disposal to the company is a transaction in its own right and SDLT is chargeable on the market value, including the 5% additional-dwelling surcharge, unless you can use the FA 2003 Schedule 15 paragraph 10 exemption for a transfer from a property partnership. That exemption is only available if the portfolio is genuinely operated as a partnership (not just a joint ownership), typically requires a formal partnership agreement in place for at least two years before incorporation, and partnership accounts filed accordingly. This is the area where mistakes compound — get a chartered tax adviser, not a YouTube video.

Mortgages, rates and the lender market in 2026

Limited company buy-to-let mortgages still carry a premium over personal-name products, but the spread has narrowed since 2023. In late 2025 Paragon was offering 5-year LtdCo BTL fixes from 5.14%, Aldermore 2-year fixes from 4.04%, and Kent Reliance briefly listed a limited edition product at 3.74% before pulling new BTL lending entirely on 17 December 2025. Most LtdCo lenders require a debenture, personal guarantees from directors, and a SIC code in the 68xxx series. Arrangement fees of 5–7% rolled into the loan are common at the keenest headline rates, so always compare the true cost over the fix period.

If you are refinancing existing personal-name mortgages onto LtdCo products as part of incorporation, expect to pay early repayment charges on the existing loans, new arrangement fees on the LtdCo loans, and a valuation fee per property. Budget £4,000–£8,000 per property in transaction costs before you even reach the SDLT question. Some lenders will offer a 'transfer to corporate' product without a full new application, but they are rare and the rate is usually no better than retail.

When to incorporate and when emphatically not to

Cheaper alternatives before you reach for incorporation

Form 17 and a deed of trust for married couples

If you and your spouse are jointly on the title, HMRC treats rental income as 50:50 by default regardless of the actual ownership split. If one of you is a basic-rate taxpayer and the other is higher-rate, that default is throwing tax away. A deed of trust can re-allocate beneficial ownership (say, 99:1 in favour of the lower-earning spouse) and an HMRC Form 17 declaration tells HMRC to tax the income on that split. The deed of trust typically costs £200–£500 from a property solicitor, the form 17 must be filed within 60 days of the deed, and the saving can be several thousand pounds a year — all without triggering SDLT (provided no consideration is paid and the mortgage is sub-£40,000 per spouse share) and without disturbing the mortgage. See our Limited Company vs Personal Buy-to-Let guide for a side-by-side.

Pension contributions as deductible expenses

Rental income is not 'relevant earnings' for personal SIPP contributions — that has been settled HMRC policy for years. But if you operate an investment company, employer pension contributions are generally allowable as an 'expense of management' under CTA 2009 s1219, following the Royal London principle, subject to the wholly-and-exclusively test. That makes the LtdCo route doubly attractive for landlords who want to build a pension pot using rental cash flow that would otherwise be locked out of tax-relieved pension funding.

Just keep accurate records and claim everything

Before any structural change, make sure you are actually claiming every allowable expense personally. Mileage at HMRC's approved rate, the property allowance where it applies, replacement of domestic items relief, gas safety and EPC fees, and a proper portion of home office costs. We see landlords leave £1,500–£3,000 a year on the table through patchy bookkeeping — and that gap shrinks the incorporation case considerably. Read our Section 24 Mortgage Interest Explained article for the personal-route playbook.

Inheritance tax and the April 2026 BPR cap

A common pitch for incorporation is 'estate planning'. Be careful. From April 2026 the 100% rate of Business Property Relief and Agricultural Property Relief is capped at a combined £2.5 million of qualifying assets, with relief above that level falling to 50%. The £1 million portion is transferable between spouses. Critically, a standard buy-to-let SPV does not qualify for BPR at all — HMRC's long-standing position is that holding investment property is not a trading activity. So incorporation does not magic an IHT exemption into existence. A Family Investment Company can be a useful estate-planning vehicle (separating economic interest from control via different share classes), but again the April 2026 BPR reforms restrict the IHT benefits that some structures previously relied on. Talk to a STEP-qualified adviser.

The real costs you must price in

• SDLT on incorporation transfer — 5% additional-dwelling surcharge + standard rates on market value (unless partnership exemption applies)
• CGT at 18%/24% on the deemed disposal (unless Section 162 incorporation relief applies and HMRC do not challenge)
• Mortgage early repayment charges on the existing personal mortgages
• New LtdCo mortgage arrangement fees, valuation fees and legal fees (~£4,000–£8,000 per property)
• Annual statutory accounts, corporation tax return and Confirmation Statement (~£1,200–£2,500 per year)
• Director's Self Assessment for any salary/dividends drawn (~£200–£500 per year)
• Higher mortgage rates on LtdCo products (~30–80bp premium vs personal-name equivalents)
• Companies House public disclosure of accounts (filleted for small companies, but still visible)

How Latch helps if you do incorporate

What to do this week if you are seriously considering it

1. Run our Section 24 tax comparison tool with your actual numbers — annual saving needs to comfortably exceed £3,000 to be worth the friction
2. Pull together a portfolio schedule: market values, mortgage balances, monthly rents, gross yields, current rates and fix expiry dates
3. Get a chartered accountant (CIOT or ATT qualified) for a paid Section 162 opinion if you have 6+ properties — expect £500–£1,500 for a written view
4. Speak to a specialist LtdCo BTL mortgage broker before assuming you can refinance at the rates on aggregator sites
5. If you are a married couple, get a Form 17 + deed of trust quote first — it might solve 70% of the problem for 5% of the cost
6. Read our Building a Property Portfolio Through Limited Company 2026 guide for the post-incorporation operating playbook
7. Build a 5-year cash-flow model that includes the upfront costs — if break-even is past year 8, think very hard about whether you will still want this portfolio then