Building a well-structured investment portfolio as an internationally mobile individual requires more thought than simply replicating a domestic UK approach. Your currency situation, tax position, access to different financial products, and the need for international portability all shape what an appropriate portfolio looks like — and how it should be managed.
Starting with goals and time horizons
Before considering asset allocation or product selection, the portfolio needs a purpose. Effective portfolio management for expats typically addresses multiple distinct goals simultaneously:
- Capital growth: building long-term wealth, typically over horizons of 10 years or more
- Income: generating regular distributions to supplement salary or meet ongoing expenses
- Capital preservation: protecting wealth in real terms, particularly for clients who have already built significant assets
- Specific future liabilities: school fees, property purchase, retirement income
Each goal may have a different time horizon, risk tolerance, and appropriate currency denomination. A portfolio serving all of these needs simultaneously requires careful segmentation — often referred to as a "bucket" or "goal-based" approach, where different portions of the portfolio are managed with different risk profiles and time horizons.
Asset classes for international portfolios
A globally diversified portfolio typically draws on the following asset classes:
Global equities provide long-term growth and are the engine of most wealth-building portfolios. For expats, global equity exposure — spanning developed markets in North America, Europe, Asia-Pacific, and selectively in emerging markets — is preferable to concentrating in UK equities, which represent roughly 4% of global market capitalisation. Equity allocations carry volatility, particularly over shorter time horizons.
Fixed income (government and corporate bonds) provides income, reduces portfolio volatility, and partially diversifies against equity drawdowns. For expat investors, bond currency choice matters — holding bonds denominated in the currency of your liabilities reduces unnecessary currency risk.
Property (via Real Estate Investment Trusts or direct property) provides income and inflation linkage. Direct property investment involves liquidity constraints and management demands. REITs offer listed, liquid exposure to property markets globally.
Alternatives — including private equity, hedge funds, infrastructure, and commodities — can provide diversification and returns that are less correlated to public markets. These asset classes are generally accessible only to high-net-worth clients through managed portfolios and require longer investment horizons.
Cash and cash equivalents provide liquidity and capital protection over the short term but are eroded by inflation over longer periods.
Geographic diversification and currency denomination
A common mistake for UK expats is to maintain a UK-centric portfolio — predominantly sterling denominated, heavy in UK equities and bonds — even when their liabilities are primarily in another currency. If you live in the UAE and spend in dirhams, a sterling portfolio exposes you to unnecessary exchange rate risk.
Geographic diversification serves two purposes: it reduces concentration risk in any single economy, and it can be used to align the portfolio with your actual currency exposure. A portfolio split across USD, EUR, AED, GBP, and other relevant currencies is more likely to track your real cost of living than a purely sterling portfolio.
The extent to which currency should be managed explicitly — through hedged share classes, currency overlay strategies, or allocation decisions — depends on the size of the portfolio and the complexity of the currency situation. See our guide on currency risk management for expats for more detail.
Tax-efficient wrappers available to non-residents
The choice of investment wrapper is critical for non-resident investors. The range of options available varies by jurisdiction, but the most commonly used structures for internationally mobile clients include:
Offshore investment bonds — the most widely used wrapper for expat investors. These are insurance-linked investment contracts issued by life companies in jurisdictions such as the Isle of Man, Dublin, or the Channel Islands. They offer tax-deferred growth, a 5% annual withdrawal allowance, and portability across jurisdictions. Gains are only taxed on encashment or surrender, and the timing can often be managed to reduce the tax charge. See our detailed guide on offshore investment bonds.
General Investment Account (GIA) — a straightforward account holding investments without any specific tax wrapper. There is no contribution limit and no lock-in. The investor pays tax on income and capital gains as they arise, according to the rules of their country of residence. For investors in low- or zero-tax jurisdictions (such as the UAE), a GIA may be entirely adequate and avoids the complexity of an offshore bond. See offshore bond vs GIA for a comparison.
ISAs — UK Individual Savings Accounts cannot receive new contributions from non-UK residents. However, existing ISAs retain their tax-free status and can be retained as an expat. They remain a useful vehicle for UK-domiciled assets.
Pensions — UK personal pensions (SIPPs) remain accessible to non-residents, though contribution rules change. Employer pension contributions may be limited or unavailable. For some clients, a QROPS (Qualifying Recognised Overseas Pension Scheme) transfer may be more appropriate. See our QROPS vs SIPP guide.
Custodian options
Investment assets need to be held somewhere. The choice of custodian matters:
- Regulatory jurisdiction: assets held in well-regulated jurisdictions (UK, Ireland, Isle of Man, Channel Islands, Luxembourg, Singapore) benefit from client money protections and regulatory oversight
- Asset protection: assets should be held in segregated client accounts, legally separate from the custodian's own assets
- Range of assets: the custodian should be able to hold all the asset classes and fund types in your portfolio
- Reporting: consolidated, multi-currency reporting is essential for expat investors
- Cost: platform and custody fees typically range from 0.1% to 0.5% p.a. of assets held, depending on the platform and portfolio size
Leading international custody platforms include major bank custody services and specialist investment platforms that are specifically designed for internationally mobile clients.
Benchmark selection
Without a relevant benchmark, you cannot properly assess whether your portfolio manager is adding value. For an internationally diversified multi-asset portfolio:
- Equity allocation: a global equity index (such as the MSCI World or MSCI All Country World) is typically more relevant than a UK equity index
- Bond allocation: a global aggregate bond index in the portfolio's reference currency
- Composite benchmark: a blended index reflecting the target asset allocation (e.g., 60% global equity, 40% global bonds) provides a meaningful comparison for a balanced portfolio
Be wary of managers who are reluctant to be benchmarked, or who select very easy-to-beat benchmarks. Performance measurement against a rigorous, relevant benchmark is a basic transparency requirement.
Rebalancing
Over time, different asset classes will grow at different rates, causing the portfolio to drift from its target allocation. Rebalancing — selling overweight assets and buying underweight ones — restores the intended risk profile.
The trigger for rebalancing may be:
- Calendar-based: quarterly or semi-annual review regardless of drift
- Threshold-based: rebalance when any asset class moves more than a set percentage (commonly 5%) from its target weight
- Combination: use thresholds with a minimum calendar frequency
For taxable accounts (such as GIAs), the tax consequences of rebalancing sales need to be considered. Rebalancing within a tax-deferred wrapper such as an offshore bond avoids this problem.
This article is for general information only and does not constitute financial or investment advice. The value of investments can fall as well as rise and you may get back less than you invest. Past performance is not a guide to future returns. Tax treatment depends on individual circumstances and may change. Seek advice from a qualified international financial adviser.
How Global Investments can help
Global Investments manages investment portfolios for internationally mobile clients, drawing on a global investment universe held through internationally recognised custodians. Our portfolios are benchmarked, regularly rebalanced, and reported on a consolidated, multi-currency basis. We structure portfolios to be efficient in the relevant tax environment for each client.
To discuss your investment requirements, contact our team or read our guide on asset allocation for international investors.
Frequently Asked Questions
Can I keep my UK ISA as an expat?
Yes, you can retain an existing ISA and it continues to grow free of UK income tax and CGT. However, once non-UK resident, you cannot make further contributions. You can resume contributing if and when you return to UK residence.
What is the best tax wrapper for a non-resident investor?
For many expats, an offshore investment bond offers the most flexibility — tax-deferred growth, a 5% annual withdrawal allowance, and portability across jurisdictions. A general investment account is simpler but offers less tax deferral. The right choice depends on your specific tax position and time horizon.
How much should I hold in cash in an investment portfolio?
A cash buffer of three to six months' living expenses is a common rule of thumb, held outside the investment portfolio. Within the portfolio, strategic cash or short-duration bonds may be appropriate depending on near-term spending plans. Excessive long-term cash holdings erode real returns through inflation.
What is a benchmark and why does it matter?
A benchmark is a reference index against which your portfolio's performance is measured. Without a meaningful benchmark, it is impossible to know whether your portfolio is performing well or poorly relative to the market. For an internationally diversified portfolio, a composite of global equity and bond indices is typically appropriate.
How do I choose between active and passive investment management?
Passive (index-tracking) funds offer low costs and consistent market returns. Active management aims to outperform, but evidence shows most active managers underperform their benchmark net of fees over long periods. A blend — passive for efficient markets, selective active for less efficient asset classes — is a reasonable approach.
This guide is for general information only and does not constitute financial advice or a personal recommendation. The value of investments can fall as well as rise and you may get back less than you invest. Tax rules, pension legislation, and investment regulations change — always verify current rules and seek advice from a qualified independent financial adviser before making any financial decisions.