Buy-to-Let in a Limited Company UK 2026: Is It Worth the Extra Admin?

The Section 24 problem for personal landlords

Before April 2017, a landlord in the 40% income tax bracket could deduct all mortgage interest from rental income and pay tax only on the remaining profit. A £10,000 rental profit after £8,000 of mortgage interest would generate £2,000 of taxable income — £800 of tax at 40%.

After Section 24 is fully in effect: The same landlord now pays 40% on the full £10,000 gross profit = £4,000 income tax, minus a 20% credit on the £8,000 interest (= £1,600). Net tax: £2,400.

That is a tripling of the tax bill on the same economic activity. For landlords with large mortgages relative to rental income, Section 24 does not just reduce profits — it can create a situation where income tax exceeds cash profit, meaning the landlord is technically loss-making in cash terms while paying tax.

Who Section 24 hits hardest:

• Higher-rate (40%) and additional-rate (45%) taxpayers
• Landlords with high loan-to-value mortgages (high interest costs)
• Those with thin margins between rent and running costs

Basic-rate taxpayers are largely unaffected — the 20% credit offsets their income tax on the finance costs, returning them broadly to their pre-2017 position.

How a limited company solves the Section 24 problem

A company incorporated under the Companies Act is a separate legal entity. It is not subject to Section 24 — it is taxed under corporation tax rules, not income tax rules. Mortgage interest and all finance costs remain fully deductible as business expenses.

Limited company profit calculation (Section 24 does not apply):

• Gross rents: £30,000
• Mortgage interest: £12,000
• Other costs (management, repairs, insurance): £4,000
• Taxable profit: £14,000
• Corporation tax (19%): £2,660

Personal ownership calculation (Section 24 applies, higher-rate taxpayer):

• Gross rents: £30,000
• Other costs (management, repairs, insurance): £4,000
• Pre-interest taxable income: £26,000
• Income tax at 40%: £10,400
• Finance cost credit (20% × £12,000): −£2,400
• Net income tax: £8,000

The difference — £8,000 (personal) vs £2,660 (company) — is substantial. But that company profit has not yet been extracted. Once you take it out, personal tax applies.

The extraction problem: money is still taxed when it comes out

The corporation tax saving is real, but if you want to use the money personally, you must extract it — and that extraction is taxed.

Optimal extraction strategy for a sole director:

1. Salary up to the NI threshold: In 2026/27, pay yourself a salary of around £9,100–£12,570. At £12,570 this uses the personal allowance, with the company paying employer NI only on the amount above the £5,000 secondary threshold (= employer NI on £7,570 at 15% = £1,136). You also pay no employee NI below the primary threshold (£12,570).

2. Dividends up to the basic-rate band: The remaining personal allowance is used by the salary. Dividends up to the basic-rate band (£37,700) are taxed at 8.75% (dividend basic rate). Above that, dividends are taxed at 33.75% (higher rate) or 39.35% (additional rate).

Combined effective tax rate (including corporation tax) for a director taking £50,000 total:

• Company earns £50,000 profit (after interest)
• Corporation tax: £9,500 (19%)
• Remaining for extraction: £40,500
• Salary: £12,570 (tax-free, small NI cost)
• Dividends: £27,930 — first £500 dividend allowance tax-free, then 8.75% on the rest
• Dividend tax: (£27,930 − £500) × 8.75% = £2,400
• Total tax (Corp + personal): £9,500 + £2,400 = £11,900
• Effective rate: 23.8%

For a higher-rate taxpayer with the same income extracted personally (no company), at 40% income tax plus NI: approximately 38–40% effective rate.

The company route saves approximately 15 percentage points in this scenario — but only if you are in a position to take dividends (and have not already exhausted the basic-rate band with other income).

Worked example: Amir, 3 properties, £60k rental profit, 40% taxpayer

Amir is a higher-rate taxpayer with three buy-to-let properties. His annual figures:

• Gross annual rent: £90,000
• Mortgage interest: £30,000
• Running costs (management, insurance, maintenance): £15,000
• Net cash after all costs: £45,000
• Non-finance operating profit (rent minus running costs): £75,000

Scenario A — Personal ownership (Section 24):

• Taxable income: £75,000 (interest not deductible)
• Income tax at 40% on £75,000: £30,000
• Finance cost credit (20% × £30,000): −£6,000
• Net income tax: £24,000
• Cash profit after tax: £45,000 − £24,000 = £21,000

Scenario B — Limited company:

• Taxable profit: £75,000 − £30,000 = £45,000
• Corporation tax (19%): £8,550
• Post-tax profit in company: £36,450
• Extraction via dividends (assuming basic-rate band available):
  • Dividend tax on £36,450 (minus £500 allowance): £35,950 × 8.75% = £3,146
• Total tax: £8,550 + £3,146 = £11,696
• Cash after tax: £45,000 − £11,696 = £33,304

Saving with limited company: £24,000 − £11,696 = £12,304 per year

Less extra costs of the company structure:

• Accountant extra cost vs sole trader: ~£1,000/year
• Higher mortgage rates on 3 properties (assume 0.75% extra on £400k mortgages = £3,000/year additional interest cost)
• Net extra annual cost: ~£4,000

Net annual saving: approximately £8,300

This is a significant annual saving. However, the calculation depends critically on whether Amir can use the basic-rate dividend band — if he has a high employed salary, dividends may be taxed at 33.75% or higher, reducing the saving.

Mortgage rates: the BTL limited company penalty

One significant disadvantage of limited company buy-to-let is the mortgage market. Lenders typically charge higher rates for company-owned property:

• Personal BTL mortgage: 4.5%–6.5% (variable by LTV and product, 2026)
• Limited company BTL mortgage: 5.0%–7.5% — typically 0.5%–2% higher

Reasons for the premium: lenders view company lending as more complex (they cannot take personal security as easily), the market is smaller, and early arrears recovery is more complicated through company structures.

On a £300,000 mortgage, a 1% rate premium costs £3,000/year in extra interest. This significantly erodes — or in some cases eliminates — the tax saving, particularly for smaller portfolios.

The lender landscape for limited company BTL has improved significantly since 2017, with many mainstream lenders now offering company BTL products. But the rate differential persists.

When does the limited company structure make sense?

Strong case for limited company:

• You are a higher or additional rate taxpayer and the section 24 impact is material
• You have or plan to have 3 or more properties (accountancy costs are spread across more assets)
• You are a long-term investor who does not need to extract all profits annually (leaving profits in the company to grow defers personal tax)
• You are buying new properties (no SDLT/CGT transfer costs)
• Your mortgage interest is high relative to rents (highly leveraged — Section 24 hits you hardest)

Weak case for limited company:

• You are a basic-rate taxpayer (Section 24 does not significantly affect you)
• You have only 1–2 properties (accountancy costs may exceed tax saving)
• You need all the income now (full extraction eliminates most of the tax advantage)
• You are a short-term investor planning to sell within 3–5 years
• Your mortgage rate premium is above 1.5% (likely eliminates the saving)

SDLT on limited company purchases

There is no difference in SDLT treatment between a limited company and a personal buyer for the basic rates. However, both are subject to the 3% additional SDLT surcharge on second and subsequent residential properties (this applies to companies on all residential purchases, regardless of how many properties they own).

A company buying a £300,000 property pays: £5,000 (basic SDLT) + £9,000 (3% surcharge) = £14,000 in SDLT, same as an individual buying a second property.

The inheritance and succession advantage

One often-overlooked benefit of the limited company structure is succession planning. Shares in a property company can be transferred more easily than individual properties:

• No SDLT on share transfers (though Stamp Duty of 0.5% applies)
• No CGT on the share transfer itself (though CGT exists on the underlying property gain embedded in the company value)
• Shares can be gifted gradually to family members using annual CGT exemptions
• Trusts can hold shares more straightforwardly than properties

For landlords with long-term family wealth transfer objectives, the company structure may offer flexibility that personal ownership cannot match.

Sources

• HMRC: Property income manual — restricted finance costs
• gov.uk: Stamp Duty Land Tax on additional dwellings
• HMRC: Corporation Tax rates
• Nationwide BTL: Buy-to-let mortgage guide
• HMRC: Dividends tax rates and allowances