The 2025 Autumn Budget and Its Potential Impact on Landlord Taxation

The upcoming 2025 Autumn Budget is anticipated to introduce significant changes affecting landlord tax bills. Key areas under consideration include possible increases in Capital Gains Tax, the introduction of National Insurance on rental profits, and adjustments to corporate tax reliefs. Landlords should prepare for these developments to manage their portfolios effectively.

Why the 2025 Autumn Budget Is Important for Landlords

The UK government generates substantial revenue from property-related taxes such as stamp duty, income tax, and capital gains tax. In light of economic pressures including rising interest rates and housing market reforms, landlords are likely to face new fiscal measures. The 2025 Autumn Budget represents the first major review of landlord taxation since the Renters’ Rights Act 2025 came into effect, placing the Chancellor in a challenging position to balance support for renters, housing supply, and economic stability while maintaining tax revenues.

Even minor adjustments to tax rates or allowable deductions could significantly affect landlords’ profitability, particularly given the current high-cost environment.

Potential Increases in Capital Gains Tax (CGT)

Capital Gains Tax is payable when landlords sell investment properties at a profit, with current rates set at 18% for basic-rate taxpayers and 24% for higher-rate taxpayers on residential property gains. There is speculation that the government may align CGT rates more closely with Income Tax rates, potentially increasing them to 40% or 45% for higher earners.

Such changes could have several implications:

• Discouraging sales: Landlords, especially those with multiple properties, might delay selling to avoid higher tax liabilities.
• Accelerated disposals: Some landlords may sell properties before the new rates take effect.
• Impact on rental supply: Fewer landlords exiting the market could increase pressure on rental availability.

Landlords considering sales should review their portfolios ahead of the Budget to mitigate potential tax increases.

Possible Introduction of National Insurance on Rental Profits

Currently, landlords do not pay National Insurance (NI) on rental income unless operating as a property business with multiple lets and active management. However, there is discussion about extending NI contributions to all unincorporated landlords to “equalise tax treatment” between self-employed individuals and property investors.

If implemented, this could mean:

• Payment of Class 4 NI contributions at 9% on rental profits exceeding £12,570.
• Reduced after-tax income for many small landlords.
• An incentive to incorporate properties within limited companies, where NI is not payable on retained profits.

While not confirmed, this proposal aligns with the Treasury’s aim to close tax gaps between different income sources.

Reform of Mortgage Interest Relief for Limited Companies

Unlike individual landlords who face restrictions under Section 24, limited company landlords currently benefit from full mortgage interest deductibility. This disparity has been described by some economists as a loophole favouring incorporated landlords.

The Autumn Budget may consider measures such as:

• Limiting full interest deductions for companies with large property portfolios.
• Introducing a corporate property surcharge for highly profitable entities.
• Implementing stricter rules on related-party lending and interest offsets.

These changes aim to balance the market and slow the growth of company-owned buy-to-let properties. For now, corporate landlords retain tax advantages, but this may change.

Potential Adjustments to Stamp Duty Land Tax (SDLT)

Stamp Duty Land Tax remains a significant source of government revenue. The 3% surcharge on additional properties is expected to continue. However, possible reforms include:

• Introducing tiered SDLT rates that increase for larger portfolios.
• Offering temporary relief for first-time investors purchasing affordable homes.
• Applying regional variations in SDLT rates to support levelling-up initiatives.

Such changes could influence landlords’ investment decisions, particularly if higher SDLT thresholds are applied in London and the South East.

Review of Inheritance Tax (IHT) Reliefs on Property

Inheritance Tax currently applies at 40% to most buy-to-let properties within an individual’s estate. Discussions have considered:

• Restricting Business Property Relief for landlords operating through companies.
• Introducing new reporting requirements for property held in trusts.
• Tightening valuation rules for estates with multiple properties.

If enacted, these changes could complicate estate planning for landlords using limited companies or trusts, prompting a reassessment of long-term ownership strategies.

Energy Efficiency and Green Property Incentives

In line with the government’s commitment to sustainability, the Autumn Budget may include measures encouraging landlords to improve energy efficiency. Possible incentives include:

• Enhanced tax reliefs for energy-efficient renovations.
• Low-interest loans or credits for upgrading insulation, heating systems, or windows.
• Linking Energy Performance Certificate (EPC) ratings to tax allowances to reward greener properties.

While these proposals are supportive rather than punitive, landlords should prepare for future obligations aligned with the government’s EPC C target by 2030.

Corporate Tax and Dividend Tax Considerations

Landlords operating through limited companies should watch for potential changes to Corporation Tax and Dividend Tax, which could affect profitability. Expectations include:

• Maintaining the Corporation Tax rate (currently between 19% and 25%) for smaller property companies.
• Possible reductions in the Dividend Allowance, currently set at £500.
• Potential increases in dividend tax rates to align with income tax thresholds.

Landlords extracting income via dividends should monitor these developments closely, as they may reduce the tax efficiency of incorporation.

Key Points for Landlords to Monitor Ahead of the Budget

Landlords should pay attention to the following areas as the Budget approaches:

1. Capital Gains Tax reforms, including possible alignment with income tax rates.
2. Introduction of National Insurance on rental profits.
3. Limits on mortgage interest deductions for companies.
4. Energy efficiency incentives and related tax reliefs.
5. Changes to dividend and Corporation Tax rates.

These factors will collectively influence the tax landscape for the 2025/26 financial year.

How Landlords Can Prepare

Review Your Portfolio Early

Landlords considering sales, transfers, or restructuring should act before the Budget to secure current tax rates.

Model Tax Scenarios

Using professional advice or digital tax software to simulate the impact of higher CGT or new NI charges can help landlords understand potential effects on returns.

Consider Incorporation

If individual tax burdens increase, holding property through a limited company may remain advantageous, but this requires expert guidance.

Keep Detailed Expense Records

Accurate digital bookkeeping will be essential for compliance with Making Tax Digital (MTD IT) from April 2026.

Plan for Energy Upgrades

Anticipate mandatory energy efficiency standards and take advantage of early incentives to improve property sustainability.

Frequently Asked Questions

When will the 2025 Autumn Budget take place?

The Budget is expected in late October or early November 2025, with the official date to be confirmed closer to the time.

Will Capital Gains Tax definitely rise?

No official confirmation has been made, but reports and leaks suggest higher rates are under consideration.

How can landlords minimise additional tax liabilities?

Through legitimate planning, including efficient ownership structuring, claiming all allowable expenses, and timing disposals strategically.

Is National Insurance on rental profits likely?

It has been discussed within government circles but would face opposition from landlord organisations.

Will the Budget affect limited company

Source: landlordadvice.co.uk