Tax Planning

The US expat guide to the UK tax year end

By Robert Paul | 25 Feb, 2018

Another US tax year may have come to a close, but for Americans living in the UK this means it is time to put things in order for 5 April.

As we approach the end of the UK tax year, here are four things Americans in the UK need to think about in terms of financial planning.

01 Make use of ISA and pension allowances

The first thing to do is take care of what many see as basic UK tax planning – contributing to Individual Savings Accounts (ISA) and pensions. Although this may seem obvious, not everyone remembers to use these allowances each year.

There is no reason why Americans living in the UK can’t contribute to a pension, but it is important to select the right pension vehicle and be aware of how personal and employer contributions are taxed from a US perspective, and how to use any foreign tax credits on your income.

One benefit is that, for anyone who hasn’t used the full annual allowance in a particular tax year, it is possible to carry forward unused contributions from the previous three tax years. By carrying forward unused pension contributions, it is possible to reduce a tax liability.

The other point is that US tax authorities view ISAs as normal investment accounts and not tax-free vehicles like they are the UK. There is still some benefit to using them, but the assets held within them need to be compliant from a US perspective and they should be managed with a view to eventually paying capital gains tax to the IRS.

02 Offset investment gains and losses

Americans who are resident in the UK pay tax to HMRC on all their worldwide income and gains regardless of location. This means all investment accounts need to be considered, whether held in the US or any other jurisdiction.

Therefore, it is important to keep track of any assets that were bought and sold during the year and then view any gains or losses from a sterling perspective.

Complicating matters is that efforts to reduce a tax liability in one jurisdiction could lead to an unwanted tax bill in the other. A UK investment portfolio won’t be managed to minimise dollar-based gains and losses at US tax year end, and this can incur capital gains taxes in a client’s US tax return. The same is of course true in reverse for a US investment manager.

03 Ensure offshore assets are compliant ahead of 5 April

From 6 April 2017, new rules applying to long-term residents who are now ‘deemed domiciled’ in the UK mean they are taxed on their worldwide income and gains once they have been in the UK for 15 out of the last 20 tax years.

Previously, resident non-doms could elect to pay tax on a remittance basis in the UK. Tax was paid on UK income and gains during the tax year they arise, but foreign income and gains were taxed only when they were brought – or remitted – to the UK.

Residents who are now deemed-domicile in the UK will no longer be able to use the remittance basis. Instead, they will be taxed on an arising basis for worldwide income and gain.

Anyone who was caught by this change was given a one-off opportunity to cleanse any assets that contain a blend of capital, income, and capital gains. The UK also allowed a ‘step-up’ in the basis cost for UK tax purposes to the value of assets on 6 April 2017, to avoid realising large gains through this cleansing.

The deadline to complete this is 5 April 2019, so time is running out to rearrange overseas funds to separate them into their constituent clean and mixed parts.

04 Gifting and charitable donations

When looking to gift assets to the next generation or make charitable donations, there are several pitfalls to avoid. The US has a more generous regime than the UK when it comes to gifting assets to family or friends, so any gifts need to be factored into a UK wealth plan or they need to be dual-compliant.

US citizens have an $11,180,000 lifetime gift and estate tax allowance and can give up to $15,000 to any individuals they want each year. They can also give $152,000 to a non-American spouse each year without it forming part of their $11.18m. These allowances are not recognised in the UK, and UK inheritance tax (IHT) will be due if they die within seven years of the gift date.

Similarly, when making charitable donations, tax breaks are only earned on both sides of the Atlantic if donations are made into dual-qualifying charities – in other words, those that are registered charities in both the US and UK. Many US charities (including many college endowments) are not recognised as charities in the UK and cannot be used to reduce a tax bill with HMRC, and this can catch people out.

Using a method or structure from which it is possible to make donations to charities in either jurisdiction (e.g. a Donor-Advised Fund) becomes a useful means to maximise the benefit.


Effective tax planning and advanced wealth structuring are critical components of preserving and growing your wealth. Our approach is rooted in providing you with the tools and strategies to optimise your financial situation. Should you have any inquiries regarding tax planning, please feel free to get in touch with our Tax & Advanced Planning team.

PLEASE NOTE: We do not provide tax advice, we collaborate with you and your London & Capital Adviser to structure your wealth in the most tax-efficient way possible.