Building a Property Portfolio Through a Limited Company UK 2026

The limited company structure has become the dominant vehicle for UK property investors building new portfolios since Section 24 finance cost restrictions reached full effect in April 2020. Corporation tax at 25% on profits above £250,000 (19% on profits below £50,000, marginal relief between) remains significantly more favourable than higher-rate income tax at 40% or 45%, especially when mortgage interest is fully deductible as a business expense within a company rather than restricted to a 20% basic-rate tax credit for personal landlords.

Data from Companies House shows that over 50,000 new property SPVs (Special Purpose Vehicles) were incorporated in 2025 alone, continuing the trend that has seen limited company buy-to-let purchases rise from 10% of the market in 2015 to over 35% by 2025. For landlords planning to build or expand a portfolio in 2026, understanding the mechanics, tax advantages, and practical challenges of the limited company route is essential.

This guide covers everything from choosing the right company structure and SIC codes to mortgage availability, profit extraction strategies, and scaling your portfolio through retained earnings. Whether you are incorporating an existing portfolio or starting fresh, you will find the practical detail you need to make informed decisions.

Why Use a Limited Company for Property Investment

The primary driver for using a limited company is tax efficiency. Since Section 24 of the Finance (No.2) Act 2015 reached full implementation, individual landlords can no longer deduct mortgage interest from rental income before calculating their tax liability. Instead, they receive only a 20% basic-rate tax credit on finance costs. For higher-rate taxpayers, this effectively increases the tax burden on leveraged property income by 20 percentage points.

Limited companies are not affected by Section 24. A company can deduct the full cost of mortgage interest as a business expense before calculating corporation tax. This single difference can save a higher-rate taxpayer thousands of pounds per year on a typical leveraged buy-to-let property.

Beyond Section 24 mitigation, limited companies offer several additional advantages for portfolio builders:

• Retained profits for growth: Profits left in the company are taxed only at corporation tax rates, allowing faster reinvestment compared to extracting profits personally and paying income tax before reinvesting.
• Flexibility in profit extraction: Directors can choose when and how to extract profits — through salary, dividends, pension contributions, or director loan accounts — optimising their personal tax position each year.
• Inheritance planning: Company shares can be transferred or gifted more flexibly than individual properties, and business property relief may apply in certain circumstances.
• Professional credibility: Lenders, letting agents, and contractors often treat limited company landlords as more professional, which can improve negotiating position and service quality.
• No additional SDLT surcharge: While companies do pay the 3% additional SDLT rate on residential purchases, this is the same surcharge that applies to individual second-home purchases, so there is no additional penalty for using a company structure.

Setting Up Your Property SPV

A Special Purpose Vehicle (SPV) is a limited company established specifically for property investment. The standard approach is to incorporate a private company limited by shares at Companies House, using SIC codes that reflect the property activity. The most commonly used SIC codes for property SPVs are 68100 (Buying and selling of own real estate) and 68209 (Other letting and operating of own or leased real estate).

Incorporation Process

• Choose a company name and check availability at Companies House
• Register the company online (£12 fee) or via paper form (£40 fee)
• Select SIC codes 68100 and/or 68209 for property investment activities
• Appoint directors (minimum one) and confirm registered office address
• Issue shares and prepare articles of association (model articles are usually sufficient)
• Register for corporation tax with HMRC within 3 months of starting trading
• Open a business bank account in the company name
• Appoint an accountant experienced in property SPVs

Shareholding and Director Structure

For married couples or civil partners, a common approach is to hold shares equally (50/50) or in a proportion that maximises tax efficiency on dividend extraction. Dividends are paid in proportion to shareholding, so structuring shares to utilise both partners' personal allowances, basic-rate bands, and dividend allowances can significantly reduce the overall tax burden when profits are extracted.

Some investors use different share classes (such as alphabet shares) to allow flexible dividend distribution. However, HMRC has become more sceptical of alphabet share arrangements used primarily for income splitting, so take professional advice before implementing this structure.

Incorporating an Existing Portfolio

Transferring personally held properties into a limited company is one of the most complex decisions a property investor faces. The transfer is treated as a disposal for capital gains tax purposes and a purchase for Stamp Duty Land Tax purposes, which can create substantial upfront costs.

Capital Gains Tax on Transfer

When you transfer a property to your company, HMRC treats this as a disposal at market value, regardless of the actual consideration paid. Any gain between your original purchase price and the current market value will be subject to CGT at 18% (basic rate) or 24% (higher rate) for residential property disposals from April 2024 onwards. The annual exempt amount is just £3,000, so for most properties the full gain will be taxable.

SDLT on Transfer

The company must pay SDLT on the market value of the transferred properties, including the 3% additional rate surcharge. For a property worth £250,000, the SDLT bill including surcharge would be approximately £10,000. This cost alone makes incorporation uneconomic for many landlords with low-mortgage or unencumbered properties.

Section 162 Incorporation Relief

Section 162 of the Taxation of Chargeable Gains Act 1992 provides incorporation relief where a business (not just investment assets) is transferred to a company as a going concern. If the conditions are met, the CGT liability is rolled over into the base cost of the shares received. However, HMRC scrutinises these claims carefully, and the property investment must demonstrate characteristics of a genuine business — active management, multiple properties, regular tenant interaction — rather than passive investment.

For the majority of landlords, the most practical approach is to retain existing personally held properties and purchase all future acquisitions through a limited company. This avoids the CGT and SDLT costs of incorporation while ensuring all new leveraged purchases benefit from the limited company tax treatment.

Limited Company Mortgage Options

The limited company buy-to-let mortgage market has expanded significantly since 2018, though rates remain slightly higher than personal buy-to-let mortgages. As of early 2026, typical limited company BTL rates are 0.3% to 0.7% higher than equivalent personal products, reflecting the additional administrative complexity and perceived risk for lenders.

Most lenders require a personal guarantee from the company directors, meaning the liability protection of the limited company structure does not extend to mortgage obligations. The mortgage is secured against the property, and the personal guarantee provides an additional layer of security for the lender.

Stress Testing and Rental Coverage

Lenders stress-test limited company BTL mortgages at a notional rate (typically 5.5% to 6.5%) to ensure the rental income covers the mortgage payment by at least 125% (basic-rate taxpayer equivalent). Because the company pays corporation tax rather than income tax, some lenders apply a lower rental coverage ratio (125% rather than 145%), which can increase the maximum borrowing available. This is one of the practical advantages of the limited company structure for highly leveraged portfolio building.

Profit Extraction Strategies

One of the key advantages of the limited company structure is the flexibility in when and how you extract profits. Unlike personal ownership where rental profit is taxed in the year it arises, a company director can choose the most tax-efficient combination of salary, dividends, and pension contributions each year.

Salary

Most property SPV accountants recommend paying a salary at or just below the National Insurance Primary Threshold (£12,570 for 2025/26). This preserves the director's state pension qualifying year, is deductible as a company expense, and incurs zero income tax and zero employee National Insurance. The employer NI cost (13.8% above £9,100) makes higher salaries tax-inefficient in most cases.

Dividends

Dividends are paid from post-corporation-tax profits and are not subject to National Insurance. The tax rates on dividends are 8.75% (basic rate), 33.75% (higher rate), and 39.35% (additional rate), with a £500 annual dividend allowance (2025/26). For a married couple with a 50/50 shareholding, up to £100,840 of dividends can be extracted at just 8.75% by utilising both partners' basic-rate bands.

Pension Contributions

The company can make employer pension contributions that are fully deductible as a business expense and do not incur National Insurance. The annual allowance is £60,000 (2025/26), and unused allowances from the previous three tax years can be carried forward. For profitable companies, pension contributions can be the most tax-efficient extraction method, as the money grows tax-free within the pension wrapper.

Companies House and Accounting Obligations

Running a property company comes with annual compliance obligations that do not apply to personal landlords. These are not onerous for a single SPV but can become time-consuming as the portfolio grows across multiple companies.

• Annual confirmation statement filed at Companies House (due annually, £13 online)
• Annual accounts filed at Companies House within 9 months of financial year end
• Corporation tax return (CT600) filed with HMRC within 12 months of financial year end
• Corporation tax payment due 9 months and 1 day after financial year end
• Maintain statutory registers (members, directors, PSC)
• File changes to company details within 14 days (directors, registered office, etc.)
• Keep accounting records for at least 6 years
• Register for VAT if turnover exceeds £90,000 (unlikely for residential lettings)

Accountancy fees for a property SPV typically range from £500 to £1,500 per year for a portfolio of up to 10 properties, depending on complexity and location. This is an additional cost compared to personal ownership where many landlords complete their own self-assessment returns. However, the tax savings usually far outweigh the accountancy costs for leveraged portfolios.

Scaling Strategies for Company Portfolios

The limited company structure is particularly well suited to portfolio scaling because profits retained in the company are taxed at corporation tax rates (19-25%), leaving more capital available for reinvestment compared to extracting profits personally and paying income tax at 40% or 45% before reinvesting.

Retained Profits and Reinvestment

A property company generating £30,000 net profit retains approximately £22,500 to £24,300 after corporation tax (depending on the rate). An equivalent personal landlord at the higher rate would retain only £18,000 after income tax, with the position further worsened by Section 24 restrictions. Over 10 years, this compounding advantage can fund the deposit on one or two additional properties purely from the tax saving.

Multiple SPV vs Single Company

Some investors use multiple SPVs (one per property or one per lender) for asset protection and lending flexibility. If one property has issues, creditors of that SPV cannot access assets held in other companies. However, each additional company incurs its own accounting and compliance costs (£500-£1,500 per year), so this strategy is most cost-effective for larger portfolios.

A single company structure is simpler and cheaper to administer but concentrates risk. Losses in one property can offset profits from others within the same company (a tax advantage), but a legal claim against the company could theoretically affect all assets. Most advisors recommend a single SPV until the portfolio reaches 10-15 properties, then consider separating into multiple vehicles.

Cross-Company Lending and Group Structures

As portfolios grow, investors may create group structures with a holding company owning subsidiary SPVs. This allows cash to be moved between companies via inter-company loans without triggering tax (subject to transfer pricing rules). Group relief can also offset losses in one subsidiary against profits in another, providing further tax efficiency.

Managing Your Company Portfolio with Latch

Managing a property portfolio through a limited company requires accurate record-keeping for both Companies House compliance and HMRC corporation tax returns. Every rental payment, expense, mortgage interest payment, and capital expenditure must be properly categorised and attributed to the correct property within the company accounts.

Latch is designed to handle the specific requirements of company-held property portfolios. All income and expenses are tracked at property level with automatic categorisation, providing the detailed breakdown your accountant needs for corporation tax returns. The platform distinguishes between revenue expenses (deductible against rental income) and capital expenditure (added to the property base cost for CGT purposes), ensuring your accounting is accurate from day one.

• Property-level P&L: Generate profit and loss reports for individual properties or the entire company portfolio, matching the format required for CT600 supplementary pages.
• Mortgage interest tracking: Automatically record and categorise mortgage interest payments as allowable expenses — no Section 24 restriction applies within a company.
• Tenant and lease management: Track tenancy agreements, rent collection, and arrears across all company properties in one dashboard.
• Document storage: Store tenancy agreements, EPC certificates, gas safety records, and other compliance documents linked to each property, ready for any HMRC enquiry.
• Multi-company support: Manage multiple SPVs from a single account, with separate reporting for each company entity.