The Retirement Planning Mistakes International Investors Make Most Often

Retirement planning mistakes are made by people at every income level, but the mistakes made by internationally mobile professionals have a particular character: they tend to be more complex, harder to reverse, and more expensive in aggregate than those made by purely domestic retirees. The interaction of multiple jurisdictions, currencies, pension systems, and tax regimes creates more opportunities for error — and the errors are often not obvious until it is too late to correct them cheaply.

Based on over 32 years of advising high-net-worth internationally mobile individuals, this article identifies the most common and consequential retirement planning mistakes. The purpose is not to alarm, but to help you identify and address these issues while there is still time.

This article does not constitute financial advice. Tax rules and regulations vary by jurisdiction and are subject to change. Seek regulated advice tailored to your circumstances.

Mistake 1: Assuming You Have More Time Than You Do

The most universal retirement planning mistake — cutting across all demographics, not just expats — is procrastination. The belief that "I'll sort this out later" is the single most expensive mistake in long-term financial planning, because the compound interest that makes wealth building possible works against you when compounding is deferred.

A 40-year-old who delays starting to invest for 5 years does not miss 5 years of returns; they miss 5 years of compounding on a portfolio that would otherwise have had 25 years to grow. At 7% per annum, £100,000 invested at 40 becomes approximately £760,000 by 65; the same amount invested at 45 becomes approximately £543,000 — a difference of £217,000 from a five-year delay.

For expat professionals who spend their 30s and early 40s earning well in low-tax environments, the opportunity cost of procrastination is even greater.

The fix: act now, regardless of imperfect circumstances. A good plan executed immediately is vastly superior to a perfect plan executed in five years.

Mistake 2: Neglecting State Pension Contributions

Many British expatriates, particularly those who leave the UK in their 30s or early 40s, assume their UK State Pension entitlement is modest and not worth bothering about. This is frequently wrong.

As of 2026/27, the full new State Pension is approximately £12,548 per year (£241.30 per week) — inflation-linked through the triple lock for life. The actuarial value of a full state pension for a 67-year-old (assuming 22 years of expected payment) is roughly £220,000–£250,000 as a comparable annuity. For couples, it could represent £400,000–£500,000 in annuity-equivalent terms.

Voluntary NI contributions to purchase missing qualifying years cost approximately £923 per year (Class 3 rate, £17.75 per week, 2025/26). Each purchased year provides approximately £342 per year of additional state pension for life — a payback period under three years.

Many expats who have worked entirely or mostly abroad have significant gaps — sometimes 20+ years — that can be purchased retrospectively at this extraordinary cost-benefit ratio.

The fix: check your National Insurance record at HMRC now (requires a Government Gateway account), identify gaps, and take advice on whether purchasing contributions is cost-effective in your situation. Act before any deadlines for purchasing historical years pass.

Mistake 3: Failing to Maximise Pension Contributions While Tax Relief is Available

UK pension contributions receive income tax relief at your marginal rate — up to 45% for additional rate taxpayers. This is an immediate 80% return on contributions before any investment return. Yet many high-earning expat professionals, either because they are confused about eligibility while abroad or because they prioritise immediate lifestyle spending, fail to maximise this extraordinary opportunity.

UK pension contributions are generally available for UK tax residents earning relevant UK earnings. For expats without UK earnings, eligibility for pension contributions is more limited — though some employer contributions remain possible.

The annual allowance is £60,000 (2026); carry-forward allows unused allowance from the previous three tax years to be added. For a professional returning to the UK temporarily or permanently, there may be an opportunity to make very large contributions using carry-forward, creating significant tax relief.

The fix: review your pension contribution history and annual allowance position. In any year when you have UK relevant earnings, maximise contributions up to the limit.

Mistake 4: Underestimating Healthcare Costs

A theme we encounter repeatedly: people plan their retirement income around current lifestyle costs, without adequately accounting for the fact that healthcare costs rise substantially with age. The error is compounded for expats who have spent years covered by employer-provided international health insurance or living in countries with cheap private healthcare.

At age 65, international private medical insurance for a healthy individual costs approximately £5,000–£9,000 per year (worldwide excluding USA coverage). By age 75, this rises significantly — and this is before considering the direct costs of increasingly frequent specialist consultations, prescription medications, dental work, and physiotherapy that are typically not fully covered even by comprehensive insurance.

Healthcare inflation consistently runs above general CPI. Plan for healthcare costs as a separate, age-escalating budget line — not as part of a flat "living expenses" estimate.

The fix: build a realistic healthcare cost projection into your retirement model, increasing at 3–4% per year above general inflation. Model costs separately for your 60s, 70s, and 80s.

Mistake 5: Ignoring Inflation Risk

The error is most acute with fixed-income products. Retirees who lock substantial wealth into level annuities or fixed-rate bonds in the early stages of retirement often experience significant real income erosion over subsequent decades.

At 3% annual inflation, the purchasing power of a fixed income halves in approximately 24 years. A 65-year-old who converts their entire pension to a level annuity may find by age 89 that the same nominal income buys 40% of what it did at retirement.

For internationally mobile retirees, the relevant inflation rate is the one in their country of residence — which may be higher or lower than UK CPI. Healthcare inflation in their country of care adds an additional dimension.

The fix: ensure your retirement income plan includes inflation-linked income sources (state pension, inflation-linked annuity for part of the portfolio), real assets (equities, property, infrastructure), and a dynamic withdrawal strategy that adjusts for inflation over time. Do not over-annuitise with level products.

Mistake 6: Confusing Residency, Domicile, and Tax Liability

This is a mistake specific to internationally mobile individuals and one with potentially very large financial consequences.

Many expats believe — incorrectly — that leaving the UK and establishing residence elsewhere means they are no longer subject to UK tax. In fact:

• UK income tax: broadly applies to income arising in the UK (rental income, UK employment income) regardless of where you live.
• UK CGT: applies to gains on UK residential property regardless of where you live; applies to other gains if you are UK resident.
• UK IHT: applies to worldwide assets of UK-domiciled individuals, regardless of where they live — and UK domicile is very hard to shed.
• UK pension tax: pension income is taxable somewhere; whether it is taxed in the UK or your country of residence depends on the relevant double tax treaty.

Conversely, many expats are uncertain about their obligations in their country of residence — sometimes paying more tax than necessary, sometimes paying less and facing penalties.

The fix: establish clear, documented tax residency in your country of residence. Understand your remaining UK tax obligations. Review the double tax treaty between the UK and your country of residence. Take advice from specialists in both UK and local tax.

Mistake 7: Over-Concentration in Property

Many internationally mobile professionals accumulate a portfolio of buy-to-let properties as their primary retirement income strategy. Property is tangible, understandable, and often the asset class that feels most controllable. But relying heavily on property for retirement income creates specific vulnerabilities:

• Illiquidity: you cannot sell a fraction of a property to meet a cash need. A financial emergency when property is your primary asset may force a costly forced sale.
• Concentration risk: a portfolio of UK buy-to-let in one or two cities is geographically concentrated and sensitive to local market conditions, regulation, and tenant issues.
• Management burden: self-managing properties from abroad is impractical; management fees (typically 10–15% of rent) reduce net yields significantly.
• Tax erosion: Section 24 restrictions on mortgage interest relief, higher-rate CGT on disposal, stamp duty surcharges, and HMRC compliance costs have reduced the attractiveness of buy-to-let significantly since 2016.

The fix: property can be a component of a retirement income plan — but not the entirety. Balance property income with pension income, investment portfolio income, and other sources. Ensure you have liquid assets independent of property.

Mistake 8: No Written Retirement Plan

A surprisingly large proportion of high-earning professionals retire without a written plan that specifies: what income they need, where it will come from, how it is structured for tax efficiency, what the backup plan is if markets fall, and how the plan adapts over time.

Without a written plan, retirement income decisions are made reactively and inconsistently. People draw from whichever account is most readily accessible, rather than from the most tax-efficient source. They allow lifestyle drift without benchmarking against a target. They fail to adjust for changing circumstances.

The fix: work with a qualified financial adviser to produce a written retirement income plan. Review it at least annually. Update it when circumstances change significantly.

Mistake 9: Delaying Lasting Power of Attorney

A Lasting Power of Attorney (LPA) for both financial affairs and health and welfare is one of the most important legal documents an individual can hold. If you lose mental capacity without an LPA in place, your family must apply to the Court of Protection — a process that is slow, expensive, and does not guarantee the outcome you would have wanted.

Many expats delay establishing an LPA because it requires a UK-based process and feels remote in prospect. Yet cognitive decline can occur at any age due to accident or illness, not just in advanced old age.

The fix: establish a UK LPA while you are mentally capable. Consider whether a local equivalent document is also needed in your country of residence. Store both originals and copies securely and ensure trusted individuals know where they are.

Mistake 10: Failing to Review and Update Plans

A retirement plan created at 55 may be significantly inadequate or inappropriate at 65 due to changes in:

• Tax law (including proposed 2027 pension IHT changes).
• Investment returns.
• Health status.
• Family circumstances (death of a spouse, divorce, new dependants).
• Country of residence.
• Currency movements.
• State pension and welfare entitlements.

Annual review of a retirement income plan is the minimum; in periods of significant change (market downturn, relocation, health change), more frequent review is essential.

The fix: schedule an annual financial review with your adviser. Review the plan whenever a significant life event occurs.

Mistake 11: Choosing Advisers on Cost Rather Than Quality

International financial planning is a specialist field. An independent financial adviser who primarily serves domestic UK clients may be entirely competent for their core client base but lack the expertise to navigate the interaction of UK pension rules, international tax treaties, offshore investment structures, and the specific rules of the countries where you live and plan to retire.

The financial consequences of poor advice in this context — unnecessary tax paid, pension transfers that were inappropriate, poor investment structures — can significantly exceed the fee savings from choosing a cheaper adviser.

The fix: when selecting financial advice for internationally mobile circumstances, prioritise demonstrated expertise in multi-jurisdiction planning over cost alone. Ask specifically about experience with clients in your specific circumstances. Verify regulatory authorisation in relevant jurisdictions.

How Global Investments Can Help

Global Investments has specialised in advising internationally mobile HNW individuals for over 32 years. We have the expertise to help you avoid — and in many cases correct — all of the mistakes outlined above.

Whether you are in the accumulation phase, approaching retirement, or already drawing down, we provide independent, regulated advice that addresses the genuine complexity of your international financial situation. Contact us for a comprehensive retirement planning review.

Tax rules and pension regulations vary by jurisdiction and are subject to change. The value of investments can fall as well as rise. This article is for information only and does not constitute regulated financial advice. Seek advice tailored to your personal circumstances.