401(k)s and IRAs: tax and retirement planning across borders

401(k), IRA and investment-account review

A 401(k) and an IRA are different retirement arrangements with their own contribution, access and distribution rules. An employer plan is not available merely because someone chooses to live in the US. Compare the actual plan with other eligible savings options and money needed before retirement.

Before arriving with foreign investments, identify funds, insurance policies, trusts and companies that may have adverse US classifications or reporting. A familiar tax-efficient product in another country may create a different result after US residence begins. Review the existing assets before replacing them or making a large disposal.

A situation worth reviewing

A British employee moving to America may have a UK pension, an ISA holding non-US funds and access to an employer 401(k). The first decision is not which account to transfer. It is how each existing holding is classified in the US, which provider will serve a US resident and what the new employer actually offers. Contribution eligibility is separate from the tax treatment of old savings.

Pension distributions, Roth status and treaties

Retirement planning starts with the account type and the owner's tax status. Traditional and Roth arrangements have different rules, and a foreign country may not mirror US treatment. Required distributions, early access and beneficiary arrangements need separate consideration.

A rollover, Roth conversion or foreign pension transfer can be a significant tax event. Compare the current and proposed residence countries, applicable treaty provisions and reporting before proceeding. Withholding is not always the final liability and can depend on documentation.

Income today, flexibility tomorrow

An American returning from Britain may have a Roth IRA and a UK workplace pension. A qualified Roth distribution has specific US rules, while the British pension needs its own US and treaty analysis. A conversion before the return, a later withdrawal and a transfer between schemes are different events. Compare them against the intended US state as well as the federal position.

For UK assets and UK connections

For a British pension, examine the UK-US treaty provisions for the exact payment, including whether it is regular income or a lump sum. A UK tax-free element is not automatically exempt in the US. For an ISA, review the underlying holdings: its UK exemption does not create a US wrapper exemption, and non-US funds may be PFICs. Review retained UK income and the departure-year residence position as well.

For US persons

For US citizens, a period abroad normally does not remove federal worldwide-income obligations. Returning changes practical account access and can change state exposure. Preserve records for retained foreign pensions and accounts, including contribution history. FBAR and other information reporting can apply independently of a current tax bill. Do not assume that closing an account removes the reporting for the year.

Before changing an arrangement

Bring the plan documents, beneficiary designations, account basis and the intended destination state to the review. Ask which distributions are required, which are optional and what a rollover or conversion would change. Pension treaty treatment, foreign reporting and the cost of implementation should be documented before authorising a transaction.