UK Chancellor’s 2025 Autumn Budget Highlights

The much-anticipated 2025 UK Autumn-ish Budget has oddly been delivered both late and early simultaneously. The UK Chancellor, Rachel Reeves, announced many changes to the UK tax regime. Below we summarise, on initial reaction, the key takeaways and how the changes could impact US/UK taxpayers.

Further detail is expected in due course. We will review the technical guidance as soon as it becomes available and will issue updated commentary to help you understand the impact on your US/UK tax position.

Summary of key takeaways

Income Tax

• Income Tax and National Insurance Contribution (NIC) thresholds frozen for a further 3 years to April 2031.
• Dividend tax rates increased by 2% on ordinary and higher rates from 6 April 2026 to 10.75 and 35.75 respectively.
• A separate tax rate for property and savings income at 22% for basic rate, 42% for higher rate and 47% for additional rate, from 6 April 2027.

Pensions

• Salary-sacrificed pension contributions above an annual £2,000 threshold will no longer be exempt from National Insurance from April 2029. Salary-sacrificed pension contributions above £2,000 will be treated as ordinary employee pension contributions in the tax system.
• No change to the 25% tax-free lump-sum.

Other

• ISA Reform – From April 2027, the ISA cash allowance will be limited from £20k to £12k, with £8k allocated to investment/stocks/shares. Over 65s, though, will retain the full cash allowance of £20,000.
• Properties in England valued over £2m, will be subject to the ‘Mansion Tax’ of £2,500, increasing to £3,500 for properties worth from £2.5m – £3.5m, £5,000 for properties worth from £3.5m – £5m and £7,500 for properties valued over £5m.
• Enterprise Investment Scheme (EIS) and Venture Capital Trusts (VCT) – From April 2026, more companies will qualify for EIS/VCT classification. However, for investors, the income tax relief is to be reduced from 30% to 20%. Noting that whilst these investments are tax favourable in the UK, income and gains from these investments would still be taxable in the US.

How can the changes affect those with a US/UK tax footprint?

• How will the increase in UK tax on property, savings and dividend income impact my global tax position?

The United States continues to tax its citizens based on worldwide income and gains, irrespective of residence. As a result, UK tax reforms do not simply adjust the UK tax position, they reshape the global tax profile for dual-resident US persons. In practice, the higher of the two countries’ effective tax rates typically applies, with the US/UK tax treaty in many cases offering relief to prevent outright double tax on the same income. This means that incremental increases in UK taxes will often increase the already significant pool of foreign tax credits to offset the corresponding US tax and the excess being carried forward for ten years.

• What should I consider when investing in ISAs?

US citizens investing in UK ISAs, particularly in stocks and shares, should be mindful of the Passive Foreign Investment Company (PFIC) rules.

• Will the Mansion Tax be creditable on my US tax return?

The Mansion Tax is being presented as an extension of the existing council tax regime. Council tax is not deductible on Schedule A (as an itemised deduction) and will not meet the requirements to be treated as a creditable foreign income tax for Foreign Tax Credit (FTC) purposes. As a result, this charge will increase the overall cost of owning £2m+ English property for US taxpayers without any corresponding US tax offset.

• If salary sacrifice pension contributions are to be limited, what should I consider if I want to set up a self-funded pension scheme?

US individuals should be aware of additional reporting obligations that could arise from investing in self-funded pension schemes.

What do I need to do now?

If you are concerned that the changes may impact you and want to speak to US/UK tax specialists for clarity or planning, please contact us.

Article written by Sina Rajaei