My portfolio consists of both individually owned and limited company BTLs. How do I accurately calculate my post-Section 24 taxable income across both structures, and are there benefits to transferring all properties into a company now?
Quick Answer
Individual landlords get a 20% tax credit on finance costs post-Section 24, while limited companies deduct all mortgage interest before corporation tax. Transferring properties incurs significant SDLT and CGT.
## Understanding Post-Section 24 Taxable Income for Individual Landlords
Since April 2020, individual landlords can no longer deduct mortgage interest and other finance costs from their rental income before calculating their taxable profits. Instead, these costs are relieved as a 20% basic rate tax credit, which directly reduces the income tax charged on property profits. This change primarily affects higher and additional rate taxpayers, as the full value of finance costs is not offset against their marginal tax rate. For example, a basic rate taxpayer historically paying 20% income tax on £10,000 profit after £5,000 interest deduction, now pays 20% on £15,000 profit but gains a £1,000 tax credit (£5,000 x 20%), maintaining their original tax liability.
To accurately calculate taxable income, an individual landlord must first declare all rental income. From this, allowable expenses *excluding* mortgage interest (such as repairs, insurance, letting agent fees, and legal costs for renewals) are deducted to arrive at a gross profit figure. The 20% tax credit is then applied to the finance costs (mortgage interest, mortgage arrangement fees, etc.), and this credit is offset against the final income tax liability. This means your tax calculation has two distinct stages: profit assessment (income minus non-finance expenses) and then tax liability reduction (minus the 20% credit on finance costs). This mechanism can push higher earners into higher tax brackets on their property income, as their 'headline' profit increases.
## Calculating Taxable Income for Limited Company Buy-to-Let Properties
Limited companies operate under a different tax regime for their property income, primarily governed by Corporation Tax. For limited company Buy-to-Let (BTL) properties, all legitimate business expenses, including mortgage interest and other finance costs, are fully deductible from rental income to arrive at the company's taxable profit. This is a key distinction from individual ownership post-Section 24, as the full value of the interest is considered a business expense.
Once the company's total profit is determined (rental income minus all allowable expenses, including finance costs), Corporation Tax is applied. As of December 2025, the Corporation Tax rate is 19% for profits under £50,000 (small profits rate) and 25% for profits over £250,000. Profits between £50,000 and £250,000 incur a marginal rate. For multi-property portfolios, all rental income and expenses across the company's properties are aggregated to form a single profit figure for Corporation Tax assessment. Any post-tax profits distributed to shareholders (like yourself) are typically subject to dividend tax, which has its own rates and allowances. This structure can be advantageous for higher-rate taxpayers who reinvest profits back into the portfolio, as funds remain within the company, deferring personal income tax liabilities.
## What are the Tax Implications of Transferring Properties into a Company?
Transferring individually owned properties into a limited company is generally treated as a sale by the individual and a purchase by the company, triggering two significant tax liabilities: Capital Gains Tax (CGT) and Stamp Duty Land Tax (SDLT). For CGT, the individual selling the property to their company is liable for any gain calculated from the original purchase price less costs, and the current market value. Basic rate taxpayers face an 18% CGT rate, while higher/additional rate taxpayers are charged 24%. The annual exempt amount for CGT is £3,000, which is significantly reduced from previous years.
Simultaneously, the limited company purchasing the property will be liable for SDLT. As of April 2025, any property purchased by a company or where it is an additional dwelling incurs a 5% surcharge on top of the standard residential rates. For example, a property valued at £250,000, assuming no other thresholds are crossed, would already fall into the 2% bracket for standard SDLT, meaning the company would pay 2% + 5% = 7% on this portion. This transfer process can be expensive; a property with a market value of £300,000 could incur a CGT liability of £30,000 for a higher rate taxpayer with a £150,000 gain (excluding the £3,000 allowance), plus an SDLT payment of potentially £21,000 (7% of £300,000 based on standard rates plus the 5% surcharge).
## Does transferring properties make financial sense given current tax rates?
Deciding whether to transfer individually owned properties into a limited company, often referred to as 'incorporation', requires a comprehensive analysis of the associated costs against the potential future tax savings. The immediate costs, primarily CGT and SDLT, can be substantial. For instance, a basic rate taxpayer sitting on a £100,000 gain from a property might face £18,000 in CGT. If that same property is valued at £200,000, the company would also pay around £14,000 in SDLT (7% including the 5% surcharge), resulting in over £30,000 in upfront costs. These figures need to be offset against the long-term benefits of full interest deductibility and potentially lower Corporation Tax rates, especially for those in higher income tax brackets and those who plan to reinvest profits.
For a portfolio where the individual landlords are higher or additional rate taxpayers, the Section 24 restriction is more acute, making the corporate structure more appealing due to full mortgage interest deductibility against a 19% or 25% Corporation Tax rate. However, the break-even point for covering the initial CGT and SDLT costs can be many years, sometimes a decade or more, depending on the property values, gains, and rental income. This decision should also factor in the Bank of England base rate, currently 4.75%, which influences BTL mortgage rates (typically 5.0-6.5%), making interest relief more impactful for higher-geared portfolios. Furthermore, the administrative burden and costs of running a limited company (accountancy fees, company secretarial duties) are generally higher than for individual ownership. It is not a universally beneficial strategy, and for many, especially those with small gains or low property values, the costs outweigh the benefits of incorporation. According to government guidance, careful calculations are required, and specific advice from a property tax specialist is essential before proceeding.
## What are the Main Benefits of Operating via a Limited Company?
The primary benefit of holding buy-to-let properties in a limited company, particularly since the full implementation of Section 24, lies in the ability to fully deduct mortgage interest and other finance costs before calculating taxable profits. This can lead to significantly lower tax liabilities for landlords who would otherwise pay income tax at the higher (40%) or additional (45%) rates, as the company pays 19% (for profits under £50k) or 25% (for profits over £250k) Corporation Tax. This is a substantial advantage compared to the 20% tax credit individual landlords receive on finance costs. For example, a property generating £20,000 in rental income with £10,000 in mortgage interest would pay Corporation Tax on £10,000 profit, whereas an individual landlord would pay income tax on £20,000 profit but receive a £2,000 credit.
Beyond tax efficiency on finance costs, a limited company structure offers advantages for **tax planning** and **reinvestment**. Profits can be retained within the company and used to purchase additional properties or fund renovations, deferring personal income tax liability until dividends are drawn. This facilitates faster portfolio growth. Additionally, the company structure can offer **estate planning benefits**, making it simpler to pass on property assets through shares, potentially avoiding issues like forced sales or high inheritance tax (IHT) liabilities that can arise with individually owned properties. **Limited liability** is also a key protection, separating personal assets from business liabilities for the company directors and shareholders. However, these benefits must always be weighed against the initial transfer costs and ongoing administrative expenses.
## Are there any non-tax considerations when choosing a company structure?
Beyond the immediate tax implications, several non-tax factors influence the decision to hold properties in a limited company. One significant consideration is **lending availability and terms**. Buy-to-let lenders often have different criteria and rates for limited companies compared to individual borrowers. While the Bank of England base rate is 4.75%, typical BTL mortgage rates can range from 5.0-6.5% for two-year fixed terms, and 5.5-6.0% for five-year fixed terms. Companies may face stricter stress tests, such as a 125% rental coverage at a 5.5% notional rate, though this is comparable to individual BTL mortgages now. Also, some lenders may offer fewer product choices or require personal guarantees from the directors, effectively negating some of the limited liability benefits. However, a growing number of lenders specialise in limited company BTL, reflecting the market trend.
Another important aspect is **administrative burden and cost**. Operating a limited company necessitates additional compliance, including filing annual accounts with Companies House, Corporation Tax returns with HMRC, and potentially payroll if you draw a salary. This typically means higher accountancy fees compared to managing personal tax returns. Legal costs for setting up the company and transferring properties can also be significant. Furthermore, **perceptions** of the structure by tenants or managing agents might vary, though functionally this distinction is usually minimal once the property is tenanted. The long-term strategy, including exit plans and future ownership aspirations, plays a significant role, as winding up a company or selling company shares involves its own set of complexities and costs. These factors must be carefully evaluated to ensure the corporate structure aligns with your overall investment goals and capacity for administration.
## How does Section 24 impact refinancing decisions for individual landlords?
Section 24 significantly impacts refinancing decisions for individual landlords due to the reduced tax relief on mortgage interest. When considering a new mortgage or product transfer at current BTL rates of 5.0-6.5%, the full interest amount is no longer deductible from rental income for tax purposes. Instead, only a 20% tax credit is applied. This means that for higher-rate taxpayers, an increase in mortgage interest payments, perhaps after a fixed term expires, will reduce their net profit less effectively than before April 2020. Their taxable income remains higher, potentially pushing them further into higher tax brackets, even if their cash flow has reduced due to increased interest.
This altered tax treatment requires individual landlords to reassess their affordability and stress testing from a cash flow perspective, not just a property income perspective. A property generating £1,000 in rent with £600 in interest might have appeared profitable before Section 24, but now the £600 interest only provides a £120 tax credit, meaning a higher proportion of the profit is taxed at a higher rate. This makes it crucial to model precise after-tax cash flows when refinancing, ensuring the property remains viable, especially with the Bank of England base rate at 4.75% driving BTL rates upwards. Understanding this, some individual landlords might even seek to reduce their loan-to-value (LTV) to lower mortgage interest burdens, or explore interest-only options if their capital repayment capacity is strained by the reduced tax relief.
Steven's Take
The shift in tax policy post-Section 24 has fundamentally changed the landscape for individually-owned portfolios. While limited companies offer distinct tax advantages, particularly for higher-rate taxpayers, the decision to incorporate existing properties is far from straightforward. The upfront costs of Capital Gains Tax and Stamp Duty Land Tax are formidable, often outweighing years of potential tax savings in a company structure. My experience suggests that for new purchases, a limited company is often the default choice for serious investors looking to scale effectively. However, for an established individual portfolio, a detailed, bespoke financial projection is essential. Blindly transferring properties can eradicate equity through unnecessary tax bills. Always crunch the numbers meticulously and consider your long-term strategy.
What You Can Do Next
1: Obtain professional tax advice: Engage a property tax specialist accountant (search 'property tax accountant' on ICAEW.com) to model your specific situation, calculating CGT and SDLT on transfer vs. ongoing individual tax liability and company tax liability. This step is critical.
2: Calculate your current tax liability: For your individually-owned BTLs, list all rental income and allowable expenses, then separately identify finance costs. Apply the 20% tax credit on finance costs against your final income tax liability. Use HMRC's online calculators for clarity.
3: Calculate limited company tax liability: For your company BTLs, ensure all rental income is recorded, and all allowable expenses, including mortgage interest, are deducted before calculating Corporation Tax at 19% or 25% (depending on profit levels).
4: Research lending options: Speak to a specialist BTL mortgage broker who understands both individual and limited company lending. Compare current rates (e.g., 5.0-6.5%) and stress test requirements (125% ICR at 5.5%) for both structures before making decisions.
5: Review your local council's SDLT policies: Check gov.uk/stamp-duty-land-tax to confirm current rates and the 5% additional dwelling surcharge for company purchases. Use the HMRC calculator to estimate the SDLT payable on any potential transfer.
6: Consider your long-term goals: Evaluate if the administrative burden and costs of maintaining a company align with your portfolio size, growth aspirations, and exit strategy. A company introduces more regular filing obligations with Companies House and HMRC.
7: Check for specific exemptions: Discuss with your tax advisor if any specific CGT reliefs, such as incorporation relief, might apply in your unique circumstances, though these are typically only available if your property business is designated as a 'trading business', which is rare for standard BTL.
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