Moving to the UK From the US? 7 Financial Decisions to Make First

A move to the UK arrives as a blur of logistics - housing, schools, a new job - and money decisions tend to wait until the dust settles. The difficulty is that some of the most consequential financial choices are best made in the first three months, before default sharden and before the first tax year closes. This article lays out the early window as a sequence, so the important decisions are made deliberately rather than by accident.

It is written for people relocating to the UK for work - particularly US citizens and green-card holders, who face the sharpest cross-border issues - and is the anchor for the rest of the UK-inbound guidance in this series.

Weeks 1-2: get the foundations in place

The first fortnight is about infrastructure. Understand your UK residence position — the Statutory Residence Test determines when you become UK-resident, which in turn drives your UK tax exposure. Open UK banking so you can be paid and pay bills. Make sure your employer has you set up correctly on PAYE, the UK's pay-as-you-earn payroll system, and apply for a National Insurance number if you do not have one. None of this is glamorous, but it is the platform everything else sits on.

Weeks 3-6: protect what you already have

With the basics running, attention turns to the assets you brought with you - and the products you are about to be offered.

Keep your US accounts (usually)

If you are a US person, your US brokerage and retirement accounts are typically the cleanest home for your investments, because they hold PFIC-free US-domiciled funds and follow familiar US tax rules. The instinct to 'simplify' by closing them on arrival is usually the wrong one. How to keep them, and what to do if a provider restricts anon-resident account, has its own article in this series.

Avoid the wrong UK products

You will quickly be offered ISAs and popular UK funds. For a US person these are usually PFICs, taxed punitively and carrying annual filing. The single most valuable early move is often simply not buying them. Understanding this before you act saves unwinding it afterwards.

Understand that you now file in two places

US citizens and green-card holders continue to file US returns on worldwide income while also entering the UK system. Knowing that both apply - and that credits and the treaty prevent double taxation - frames every other decision.

{{INSET-CTA-1}}

Weeks 6-12: set the longer-term defaults

The final third of the window is where youset things that compound over years.

Workplace pension decisions

You may be auto-enrolled into a UK workplace pension. For a US person there are real benefits - an employer match is valuable and employer contributions are generally treaty-protected - but the funds inside need attention for PFIC reasons. This is a decision to make with both systems in view, not to opt out of by reflex.

Currency strategy

You are now earning in pounds while possibly holding dollar assets and obligations. Deciding how and when to convert, and how much currency risk to carry, is a question worth addressing early rather than reacting to exchange-rate swings.

The four-year FIG regime and year-end

If you have arrived after a long period of non-UK residence, you may qualify for the four-year Foreign Income and Gains regime, which can shelter foreign income and gains in your early UK years. Because the UK tax year ends on 5 April, and because some choices are time-sensitive, getting cross-border advice before that first year-end is often where the early planning pays off.

A first-90-days checklist

1. Confirm your UK residenceposition under the Statutory Residence Test.
2. Open UK banking and confirmcorrect PAYE set-up and a National Insurance number.
3. Decide what to do with your USbrokerage and retirement accounts before changing anything.
4. Avoid opening ISAs or buying UKretail funds until you understand the PFIC consequences.
5. Confirm your dual-filingposition and whether the FIG regime applies to you.
6. Make a deliberateworkplace-pension decision and set a currency approach.
7. Get coordinated UK–US advicebefore the 5 April year-end.

An illustrative example

Consider a hypothetical US citizen, age 36,relocating to London on a three-year assignment. In her first month she sets up banking and payroll; in her second she resists opening a stocks-and-shares ISA and keeps her US brokerage account intact; in her third she enrols in her employer's pension for the match while flagging the fund choice for review, and books cross-border advice ahead of the UK year-end. None of these steps is dramatic, but together they keep her options open. Had she closed her US account and loaded up on UK funds instead, the same three months would have created problems to unpick for years. This example is hypothetical and for illustration only.