Active vs Passive Investing for International Portfolios

The active versus passive investment debate has been one of the most consequential arguments in personal finance over the last three decades. Once dominated by active managers insisting that skill and research could generate consistent excess returns, the weight of evidence has shifted significantly. Most individual investors are now better served understanding both sides clearly rather than being sold a dogmatic position.

The case for passive investing: what the evidence shows

The central evidence is straightforward. In any given year, roughly 50% of active fund managers outperform their benchmark by definition — someone has to be on each side of every trade. The question is whether outperformance persists over time, and whether it persists after the costs of active management are subtracted.

The SPIVA (S&P Indices Versus Active) report, published annually, is the most comprehensive scorecard. Its findings are consistent across markets and time periods: the majority of actively managed funds underperform their benchmark after fees over 5, 10, and 15-year periods. In the US large-cap equity market — the world's most studied and most efficiently priced — the figure is typically 80–90% of active funds underperforming over 15 years.

The reasons are structural:

• Active management costs more. The ongoing charge of a typical active equity fund is 0.5–1.5% per year. A passive ETF may cost 0.05–0.2%. This gap must be overcome by outperformance before the investor breaks even.
• Zero-sum dynamics. The average active manager, by definition, generates the market return before costs. After costs, the average active manager underperforms the market. Some managers outperform consistently, but identifying them in advance (rather than in retrospect) is extraordinarily difficult.
• Market efficiency. In large, liquid, heavily-analysed markets (US large-caps, UK large-caps, major government bonds), prices incorporate available information quickly. Finding persistent mispricings is hard.

For most investors, most of the time, the rational baseline is a low-cost passive portfolio tracking broad market indices.

The case for active management: where it can add value

The case for active management is not dead — it is market-specific.

Less efficient markets. Smaller company equities, frontier markets, and some specialist sectors are less widely analysed. Information advantages — from dedicated research and on-the-ground expertise — can produce consistent outperformance in these markets more readily than in large-cap developed markets. A specialist small-cap Asia fund managed by a team with regional expertise is a genuinely different proposition from a large-cap S&P 500 fund.

Credit markets. The high yield bond market and emerging market debt are less efficiently priced than government bonds. Skilled credit analysts who understand the underlying companies can add meaningful value through security selection. The evidence for active outperformance in high yield is stronger than in large-cap equities.

Alternatives and private markets. By definition, private equity, private credit, infrastructure, and real assets cannot be passively indexed. Access to top-quartile managers in private markets can generate returns meaningfully above public market equivalents — though with illiquidity and complexity as the trade-off.

Currency overlay and tactical asset allocation. Some active management is at the portfolio level rather than security level: managing currency exposures dynamically, adjusting duration in response to interest rate views, or tactically reducing equity weight when valuations are extreme. These decisions can add value even if underlying security selection is passive.

The costs: a practical comparison

The ongoing charge is the clearest metric for comparing active and passive:

• Passive global equity ETF: 0.07–0.20% per year
• Passive UK government bond ETF: 0.05–0.15% per year
• Active global equity fund (institutional share class): 0.5–0.9% per year
• Active emerging market equity fund: 0.7–1.0% per year
• Active high yield bond fund: 0.5–0.8% per year
• Active private equity (carried interest + management fee): significantly higher, typically 1.5–2.0% management fee plus 20% of profits above a hurdle

For a £1,000,000 portfolio, the difference between a fully passive approach at 0.15% total cost and a fully active approach at 0.9% is £7,500 per year. Compounded over 20 years, the drag is substantial.

This does not mean active management is never worth the cost — but the bar for justification is clear. An active manager must generate at least the cost differential in excess returns, consistently, to justify the premium.

A practical hybrid approach

For most internationally mobile investors, a hybrid approach is rational:

Use passive funds for:

• US large-cap equities (one of the most efficient markets)
• Developed market government bonds
• Broad global equity core allocation

Consider active management for:

• Emerging market equities (less efficient pricing)
• High yield and credit (genuine value in credit analysis)
• Small and mid-cap equities in specialist markets
• Private market alternatives
• Any mandate requiring specific expertise (such as thematic investing in markets where dedicated knowledge matters)

Factor investing: the middle ground

Factor investing (also called smart beta) sits between purely passive market-cap indexing and fully active management. Factor funds tilt the portfolio towards specific characteristics — value, quality, momentum, low volatility, small size — that academic research and long-term data suggest are associated with higher returns over time.

Factor ETFs are typically cheaper than active funds (0.2–0.4% ongoing charge) but more expensive than plain market-cap index funds. They represent a structured, rules-based approach to capturing research insights without paying active management fees for full discretion.

For internationally mobile investors, factor tilts can be implemented across different jurisdictions and asset classes, allowing a degree of systematic active exposure within a broadly passive framework.

Currency and geography: the additional dimension for international investors

The active versus passive question takes on an additional layer of complexity for internationally mobile investors, because the choice of what to index matters as much as whether to index.

A standard passive global equity portfolio (such as an MSCI World tracker) is approximately 65–70% US equities by market capitalisation weight. For an investor who spends in euros or dirhams, this creates implicit currency concentration: most of the portfolio's returns are driven by the performance of US stocks denominated in US dollars.

This may or may not be appropriate. The point is to make it an explicit decision rather than an accidental consequence of choosing the cheapest index fund.

Several options exist for investors who want genuine geographical diversification:

• Equal-weighted regional allocation — deliberate allocations to US, Europe, Asia Pacific, and emerging markets in proportions that reflect the investor's view rather than market capitalisation
• Currency-hedged versions of index funds, which strip out the currency effect and deliver the equity return in the investor's base currency
• Active international mandates where the manager actively manages both security selection and currency exposure

Tax efficiency and the active/passive choice for offshore investors

For internationally mobile individuals holding investments within an offshore portfolio bond wrapper — which is one of the most tax-efficient structures for internationally mobile individuals — fund choice matters for both return and tax reasons. Offshore bond platforms typically offer access to several thousand authorised collective investment funds, including passive ETFs and UCITS-compliant active funds.

There is an important practical point here: passive ETFs that are highly tax-efficient in a direct ISA or pension context may provide less incremental benefit inside an offshore bond, where gains already roll up without annual tax. The offshore bond wrapper removes the annual tax drag regardless of whether the underlying fund distributes income — meaning the gross roll-up benefit of the bond applies equally to active and passive funds held within it.

In this context, the decision between active and passive within an offshore bond is primarily one of expected returns and costs, rather than tax efficiency — the tax argument that usually dominates the case for passive (avoiding annual CGT and income tax crystallisation) is already addressed by the bond wrapper.

Rebalancing: active decisions in a passive portfolio

Even a fully passive, index-tracking portfolio requires active decisions:

• Setting and maintaining target allocations across asset classes
• Rebalancing when allocations drift (which involves selling winners and buying laggards)
• Responding to lifecycle changes (approaching retirement, changing currency base, shifting income needs)
• Managing tax efficiently when rebalancing in a taxable account

These are genuine active decisions that require judgement and should not be left to default. An adviser who constructs a passive portfolio but then ignores it for years is not providing value. The ongoing management of asset allocation — even for a passive portfolio — is a material service.

Offshore bonds and fund choice

For UK expatriates holding investments inside an offshore portfolio bond wrapper, fund selection within an offshore bond should be made consistently with the overall active/passive philosophy, taking into account the ongoing charge impact within the tax wrapper.

Frequently asked questions

If passive is clearly better on average, why does anyone use active management?

Several reasons: some active managers do genuinely outperform consistently; active management in less efficient markets (small-cap, high yield, emerging markets) has a stronger evidence base; institutional investors sometimes need active management to deploy very large sums without distorting markets; and many investors prefer active management for psychological reasons (the sense that someone is managing risk dynamically). The key is to understand which markets and mandates justify active fees — and not to pay active fees where passive provides equivalent or better results.

Should I use a UK-domiciled ETF or an Irish-domiciled ETF?

For internationally mobile investors, Irish-domiciled UCITS ETFs are generally preferable. They benefit from Ireland's tax treaty network — in particular, a reduced US dividend withholding tax rate of 15% (versus 30% for non-treaty jurisdictions) — and are structured for international distribution. Many of the most liquid and cheapest index ETFs available on offshore platforms are Irish-domiciled.

Does the active vs passive question apply to private equity?

Not in the same way. Private equity cannot be passively indexed — every investment involves specific decisions about which companies to back. The relevant question for private equity is whether the chosen manager consistently achieves top-quartile returns that justify the fees, and whether the illiquidity premium is worth the lock-up period. Private equity should be assessed on its own merits relative to public market equivalents, not on the active/passive framework that applies to listed securities.

How often should I review my active fund choices?

Active managers should be reviewed annually as a minimum — assessing whether performance versus benchmark is consistent with what the manager claimed they would do, whether the fund's characteristics have changed (style drift), whether costs remain competitive, and whether the investment thesis behind including the fund still holds. Passive funds require less frequent review but should still be checked annually for changes in tracking error, fund size, and cost.

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This article is for general information only and does not constitute investment advice. Past performance is not a reliable guide to future returns. Investments can fall as well as rise. Contact us to discuss how to structure your international investment portfolio.