Moving abroad from the UK: what happens to your ISA, pension, investments and tax?

Start with tax residence, not the moving date

Buying a one-way ticket does not make you non-UK resident. HMRC applies the Statutory Residence Test separately to each tax year, running from 6 April to the following 5 April. The test considers days, work and connections to the UK.

The test is applied in order. First consider the automatic overseas tests. If none applies, consider the automatic UK tests. Only if neither group settles the answer do you move to the sufficient ties test.

The famous 183-day figure is therefore only one automatic UK test. Someone can be UK resident with far fewer days. Equally, someone working full-time overseas may qualify for an automatic overseas test while still making limited UK visits, provided every condition is met.

Count midnights, but do not assume a spreadsheet of flights is enough. Special rules can deem some days to be UK days, exceptional circumstances can affect counting, and a day involving more than three hours of UK work matters for specific tests. Record travel, accommodation and work contemporaneously rather than rebuilding the year from memory.

The sufficient ties test can make short visits expensive

If no automatic test decides residence, HMRC combines UK days with defined UK ties. The more ties you have, the fewer days are needed for UK residence.

The labels sound conversational, but the definitions are technical. Owning a UK property does not automatically create an accommodation tie, and having relatives in Britain does not automatically create a family tie. Conversely, a home kept available for visits, repeated UK workdays or a pattern of prior visits can matter even when you feel that your life has moved abroad.

A practical rule is to plan the days only after identifying the ties. If a large disposal, pension withdrawal or bonus depends on being non-resident, do not use a target that sits one day below a threshold. Travel disruption and unexpected UK work can consume a narrow margin quickly.

A departure year is not automatically split

UK residence is normally determined for the whole tax year. Split-year treatment can divide a UK-resident departure year into a UK part and an overseas part, but only if one of the statutory departure cases applies. It is not an election and it does not arise simply because you moved in September.

The departure cases broadly concern starting full-time work overseas, accompanying a partner who does so, or ceasing to have a UK home. Each has detailed conditions and its own split date. If more than one case applies, priority rules determine the result.

The date of a bonus, dividend, fund distribution, company sale, property completion or pension withdrawal can therefore matter. Do not accelerate or delay a material transaction based only on an assumed split date.

A short move may not break the UK tax connection

The temporary non-residence rules are designed to stop someone leaving briefly, realising income or gains outside the UK and returning with the UK charge permanently avoided.

Under HMRC's current summary, the rules can apply where you had sole UK residence in at least four of the seven tax years before departure and the period without sole UK residence lasts five years or less. Certain capital gains, close-company distributions, pension amounts, offshore income gains and other items received while away can then be taxed when you return.

Example, not advice: someone who has lived in Britain for a decade, moves abroad for three years, sells a large share portfolio and then returns cannot safely assume that non-residence permanently removes UK tax on the gain. The asset, timing, prior residence and treaty position all need analysis before the sale.

Tell HMRC and close the departure year properly

HMRC says you must tell it if you leave permanently, go to work abroad full-time for at least one full tax year, or are a foreign national leaving the UK. The method depends on whether you normally file Self Assessment.

HMRC's own online Self Assessment service does not support SA109. A paper return or suitable commercial software may be needed. The filing route and deadline can therefore differ from the familiar online process.

Keep a departure file containing travel dates, workdays, employment contracts, tenancy or purchase documents abroad, evidence about the UK home, P45 and P60 documents, investment statements, pension records, valuations and professional advice. Residence disputes are evidence problems as much as arithmetic problems.

• Confirm the date UK employment ends and whether any bonus, share award or deferred compensation relates to UK duties.
• Identify continuing UK income such as rent, pensions, savings interest or company distributions.
• Record every UK visit and every day on which more than three hours of UK work is performed.
• Update HMRC when circumstances change rather than relying on the original plan.
• Retain documents for the relevant tax-record period and longer where a major transaction may be reviewed later.

Leaving does not switch off every UK tax

A non-resident usually falls outside UK tax on foreign income, but UK-source income can remain taxable. The destination country may also tax the same amount because residents are often taxed on worldwide income. The result is not necessarily double tax, but it can mean two returns and a relief claim.

Do not confuse source, account location, trading currency and tax residence. A US share held through a UK platform by a Spanish resident can involve US withholding, a UK provider and Spanish reporting. The platform's postcode is not the answer to who taxes the investment.

A tax treaty allocates rights, but it does not create one universal rule

The UK has double-taxation agreements with many countries. A treaty can help resolve dual residence, allocate taxing rights over categories of income and provide credit or exemption so the same income is not fully taxed twice.

Treaties are not interchangeable. Private pensions, government-service pensions, property income, employment, dividends and capital gains can each have different articles. The treaty may give one country the primary right to tax while allowing the other to tax with a credit, or it may give exclusive taxing rights.

A treaty also does not make the two countries' tax years align. The UK tax year starts on 6 April, while many countries use a calendar year. One move can therefore create overlapping filings with different exchange rates, payment dates and reporting bases.

• Confirm domestic residence under both countries' rules.
• If both claim residence, apply the treaty residence provisions and obtain advice.
• Classify each income source correctly before reading the relevant treaty article.
• Check whether relief is claimed at source, through a return or by refund.
• Keep certificates of residence and proof of foreign tax paid where required.

Your ISA can survive, but its tax advantage may not

Once you become non-UK resident, you normally cannot subscribe new money to an ISA. The main exception covers qualifying Crown employees working overseas and their spouse or civil partner. You must tell the provider when you stop being UK resident.

You can normally keep the ISA open, retain UK tax relief on assets inside it and transfer it between providers. If you later return and become UK resident, contributions can resume subject to the rules and allowance then in force.

The UK's ISA exemption does not bind the country where you now live.

The destination may treat interest, dividends and gains inside the ISA like those in an ordinary taxable account. It may require annual reporting even without a withdrawal. It may also classify particular funds differently, apply wealth taxes or deny loss relief. Keeping an ISA can still be sensible, especially if a return to the UK is plausible, but 'tax-free ISA' is no longer a complete description.

Taxable investments need a country-by-country audit

A general investment account does not stop working because you move. The provider may restrict trading or new purchases based on local regulation, but the portfolio can remain legally owned. The tax treatment is the harder part.

Before departure, create a holding-level record with name, ISIN or ticker, number of units, purchase dates, original cost, current value, accumulated income and account wrapper. Download contract notes and statements while access is straightforward.

Then ask how the destination treats each holding. Some countries distinguish accumulating and distributing funds. Some have punitive rules for foreign funds, special reporting for overseas accounts, wealth taxes or deemed annual income. A fund that was simple inside a UK ISA can become administratively expensive abroad.

• Will the destination recognise your historic sterling acquisition cost or use a value on arrival?
• Which exchange rate must convert purchases, income and sales into the local reporting currency?
• Are unrealised gains, fund accumulations or wealth taxed annually?
• Are UK funds or ETFs locally approved, reportable or treated as offshore structures?
• Can capital losses be used, and must they be registered in the year they arise?
• Will dividends suffer withholding before local tax and foreign-tax credit?

Do not sell everything reflexively. A sale before departure may trigger UK tax; a sale after departure may trigger destination tax or temporary non-residence rules. The correct action depends on both systems and the exact date each residence status begins.

UK pensions usually do not need to move with you

A workplace or personal pension can normally remain in the UK after you leave. The investments continue under the scheme rules, though the provider may restrict contributions, new products or servicing for residents of some countries.

Personal contributions and UK tax relief become more limited. HMRC's pensions manual explains that a person who has ceased UK residence may remain a relevant UK individual for a limited period, generally only where UK residence stopped within the previous five tax years and other conditions are met. Without relevant UK earnings chargeable to UK tax, relief may be limited to contributions of £3,600 gross a year through a relief-at-source scheme. Provider acceptance and annual-allowance rules still matter.

Pension withdrawals can be taxed by the UK, the destination or both before treaty relief. The treatment of a regular pension, a flexi-access withdrawal and a lump sum may differ. A withdrawal described as tax-free in the UK can still be taxable abroad.

Transferring to a qualifying recognised overseas pension scheme, or QROPS, is not an automatic improvement. The overseas scheme must qualify, fees and investment options need comparison, and a 25% overseas transfer charge can apply depending on where the scheme is established, where you live and the available overseas transfer allowance. Moving countries within five years of a transfer can change the charge.

State Pension planning changed in April 2026

You can claim the UK State Pension abroad if your National Insurance record is sufficient. Whether it increases each year depends on where you live. Uprating generally applies in the European Economic Area, Gibraltar, Switzerland and countries with a relevant social-security agreement; it is frozen in many other destinations.

From 6 April 2026, voluntary Class 2 National Insurance is no longer generally available for periods abroad. New applications to pay voluntary Class 3 for those periods normally require either ten continuous years of UK residence or ten qualifying years of National Insurance contributions, subject to transitional and special rules.

Before paying voluntary contributions, check your State Pension forecast and ask the Future Pension Centre or International Pension Centre whether filling a specific gap would increase the pension. Paying for a year that produces no additional entitlement is not useful merely because the contribution is available.

• Download a State Pension forecast before leaving.
• Check the National Insurance record for gaps and incorrect years.
• Establish whether the destination coordinates social-security contributions with the UK.
• Confirm whether the UK pension will be uprated there.
• Compare payment into a UK account with local-currency payment and conversion costs.

Keeping a UK home creates a second financial system

A retained home can be emotionally reassuring and financially awkward. It can create mortgage, insurance, letting, tax, management, currency and residence-test consequences at the same time.

If you let the property while living abroad for at least six months a year, HMRC normally treats you as a non-resident landlord for the scheme, even if you remain UK resident under the Statutory Residence Test. A letting agent, or sometimes a tenant, may have to deduct basic-rate tax from rent unless HMRC approves payment gross. Receiving rent gross does not remove the duty to report and pay the correct tax.

Non-residents must report disposals of UK property or land within 60 days of completion, even where no tax is due or a loss is made. Private Residence Relief may be limited once the property is no longer the qualifying main home. The destination country may also tax the rent and gain, subject to treaty relief.

Inheritance Tax can follow you after departure

From 6 April 2025, UK Inheritance Tax exposure to overseas assets is based on long-term UK residence rather than the previous domicile framework. Broadly, someone resident in the UK for at least ten of the previous twenty tax years can be a long-term UK resident.

Leaving does not always end that status immediately. Depending on the prior residence history, a person can remain within the long-term-residence tail for between three and ten tax years. Trusts, lifetime gifts, life cover, pension nominations, wills and the destination's succession taxes can all interact with this.

This area needs bespoke advice where the estate is material, a trust exists, spouses have different residence histories or the move is intended to be permanent. A will that works in England does not by itself settle forced-heirship, matrimonial-property or probate issues abroad.

Banking, platforms and currency need operational planning

There is no universal rule requiring every UK bank or investment platform to keep serving you. Each provider decides which countries it supports within its regulatory permissions and risk appetite. Some allow existing accounts but restrict new products or trading; others may require closure.

• Tell each provider the new address and tax-residence details. Do not leave a false UK address on file.
• Ask in writing whether the account, cards, direct debits and investments will remain available in the destination.
• Download statements, cost records and tax certificates before access or authentication changes.
• Keep at least two payment routes during the transition rather than relying on one card or one transfer provider.
• Update phone numbers carefully so security codes do not depend on a cancelled UK SIM.
• Check deposit and investment protection separately. A familiar brand can use different legal entities in different countries.

Currency deserves its own plan. Salary and spending may move to euros while the ISA, pension and UK property remain in sterling. That is an economic exposure, not just a transfer-fee question. Decide which future spending each pool is intended to fund before converting large balances.

For near-term moving costs, certainty usually matters more than squeezing out a possible investment return. Money for deposits, tax, removals and the first months abroad should not depend on selling volatile assets on a favourable day.

Do not forget student loans and smaller financial obligations

If you leave the UK for more than three months, you must update the Student Loans Company. Overseas repayments are made directly rather than through UK PAYE, and the income threshold varies by country. Failing to provide information can create arrears, penalties or a higher assumed repayment.

The same principle applies across the rest of the financial administration. A move can affect benefits, child support, professional insurance, company directorships, tax-advantaged employee share plans and the place where a business is managed. These are not side notes if they apply to you.

Build the move around a twelve-month timeline

Six to twelve months before departure

• Map expected residence under UK law, destination law and the tax treaty.
• List every account, pension, investment, debt, property, company interest and insurance policy.
• Obtain destination-specific tax advice before selling, gifting, transferring or withdrawing material assets.
• Decide whether the UK home will be sold, left empty or rented, including mortgage and insurance permission.
• Estimate one-off moving costs and the accessible reserve required after arrival.

Three to six months before departure

• Check provider support for the destination and identify replacement banking if needed.
• Download investment acquisition records, pension statements, National Insurance history and State Pension forecast.
• Review employment compensation, share awards and bonus timing with advisers where material.
• Open necessary destination accounts without closing the UK payment infrastructure too early.
• Prepare property management, letting-agent and non-resident-landlord arrangements if retaining the home.

The final month

• Record the exact departure date, UK accommodation position and planned UK workdays.
• Update providers, insurers, HMRC and the Student Loans Company as applicable.
• Retain UK and overseas proof of address, employment and travel.
• Move near-term spending money, but avoid irreversible portfolio changes without the tax analysis.
• Create a calendar for UK and destination tax registrations, returns and payments.

The first year abroad

• Track UK visits, midnights and workdays throughout the UK tax year.
• Register and file in the destination by its deadlines.
• Report UK income and claim treaty relief through the correct route.
• Review the portfolio after learning the destination's fund, wealth-tax and reporting rules.
• Revisit the plan if employment, family, housing or the expected return date changes.

Three worked examples show why the order matters

Example 1: an employee moves permanently and keeps the UK home

Assumptions: Maya leaves in September for a full-time overseas role, expects 55 UK days during the tax year, retains a UK home that will be rented and has been UK resident for the previous decade.

Maya cannot conclude non-residence from 55 days. She must test the full-time overseas conditions, UK workdays and sufficient ties. She must consider split-year treatment, register the property under the Non-resident Landlord Scheme, report rent in the UK and check local taxation. Her ISA can remain open but new subscriptions normally stop once she becomes non-resident. The retained home may also affect her accommodation tie.

Example 2: an investor leaves for three years and expects to return

Assumptions: Daniel has been solely UK resident for six of the previous seven tax years. He moves abroad for a three-year assignment and plans to sell a concentrated shareholding after departure.

Daniel may be non-resident during the assignment, but the expected return places temporary non-residence squarely in the analysis. Selling after the flight does not prove the gain escapes UK tax. He needs advice on residence periods, the destination's tax, treaty relief and the UK charge that could arise on return.

Example 3: a retiree moves and draws a UK pension

Assumptions: Priya moves permanently, keeps a UK SIPP and begins withdrawals after arrival. She also expects the UK State Pension later.

Priya should not transfer the SIPP merely to make the account match the address. She first compares provider access, costs, regulation, investments and any QROPS charge. She checks which country the treaty allows to tax private-pension withdrawals, how to obtain relief from UK withholding and whether a UK tax-free element is taxable locally. Separately, she checks State Pension uprating and her National Insurance record.

Know when the decision has outgrown a general guide

Professional advice is most valuable before an irreversible action, not after a tax return reveals the consequence. Seek coordinated UK and destination advice where any of the following applies:

• Residence is close to a day or ties threshold.
• You will work in more than one country or for a UK company after moving.
• A bonus, carried interest, share award, business sale or large capital gain is expected.
• You plan to draw or transfer a pension around departure.
• You own a UK company, partnership, trust or material overseas assets.
• You are retaining or selling UK property.
• You have been UK resident for ten or more of the previous twenty years and Inheritance Tax matters.
• You expect to return within five years.
• The two countries both appear to treat you as resident.

Ask the advisers to coordinate rather than producing two isolated memoranda. The useful output is a dated action plan showing residence assumptions, transaction timing, filing responsibilities, treaty claims and the evidence to retain.

The bottom line

Moving abroad is not a switch from UK rules to foreign rules. For a period, you may need to operate both systems at once. Tax residence drives the sequence, but wrappers, pensions, property, National Insurance, student loans and provider policies each follow their own rules.

Work out residence before moving assets. Treat split-year treatment as a test, not an assumption. Do not mistake an ISA's UK exemption for worldwide tax freedom, or non-residence for immunity from UK property tax and temporary non-residence rules. Keep records while the facts are fresh.

The objective is not to eliminate every connection to Britain. It is to know which connections remain, what each one costs and whether it still serves the life you are building abroad.