Why Foreign Bonds Can Still Appeal When Domestic Yields Rise

A rise in domestic government bond yields can appear to weaken the case for investing overseas. If an investor can earn a more competitive return at home, why accept foreign exchange risk and additional complexity?

The answer is that institutional bond decisions are rarely based on headline yields alone.

A Japanese pension fund comparing Japanese government bonds with US Treasuries, for example, may assess currency hedging costs, interest-rate sensitivity, liquidity, liability matching and diversification. The final decision depends on the role that each bond is expected to play within the wider portfolio.

Headline yield is only the starting point

The simplest comparison places the yield on a domestic bond next to the yield on a foreign bond with a similar maturity.

A related comparison is explored in earnings yield vs bond yield.

That can be useful, but it is incomplete. A foreign bond's headline yield is normally stated in its own currency. A Japanese investor buying a US Treasury receives dollar-denominated interest and principal, while its spending needs or liabilities may be measured in yen.

The investor therefore has two broad choices:

• Leave the currency exposure unhedged and accept movements in the exchange rate.
• Hedge the currency exposure, which introduces a cost or benefit that can materially alter the expected return.

This means a higher-yielding overseas bond does not necessarily deliver a higher return in the investor's home currency.

Currency hedging can change the calculation

A currency hedge is designed to reduce the effect of exchange-rate movements. Large investors may use forward contracts or related instruments to achieve this.

As a rough framework, an investor might think of the hedged return as:

Foreign bond yield minus currency hedging cost, before fees and other adjustments.

The real calculation can be more complicated. Hedging costs may change over time, contracts need to be renewed, and market pricing can differ from a simple comparison of policy rates. Trading costs and the precise maturity of the hedge also matter.

An overseas bond can therefore look attractive on an unhedged basis but less appealing after hedging. The reverse may also occasionally be true.

Some investors deliberately leave part of their currency exposure open. They may want diversification across currencies or believe that the foreign currency could help during certain market conditions. That introduces another source of volatility, however, and exchange-rate movements can overwhelm the bond's income over shorter periods.

Yield and duration are separate questions

Two bonds with similar yields may react differently when market interest rates change.

Duration is a measure of a bond's sensitivity to changes in yields. In general, a longer-duration bond experiences a larger price movement for a given change in market rates than a shorter-duration bond.

An investor may prefer a foreign bond because it provides a particular duration exposure that is difficult to obtain domestically. Another investor might favour the domestic bond because it better matches the timing of future payments.

This helps explain why the decision is not simply about choosing the largest number. The relevant questions include:

• How much interest-rate risk is being taken?
• Where on the yield curve does the exposure sit?
• Does the bond mature when the investor expects to need the money?
• Is the aim to generate income, preserve capital, hedge liabilities or respond to an economic scenario?

A higher yield can partly represent compensation for greater duration or other risks. It should not automatically be treated as a free improvement in return.

Diversification still has a role

Institutional portfolios are often designed to avoid excessive dependence on one country, currency or interest-rate cycle.

Domestic government bonds may be useful for matching local liabilities, but concentrating the entire fixed-income allocation in one market creates its own risks. Overseas government bonds can broaden exposure to different yield curves, monetary conditions and market structures.

Diversification does not guarantee a profit or prevent losses. Correlations can also rise during periods of stress. Even so, holding several types of high-quality bond exposure may produce a more balanced set of risks than relying on one market alone.

This principle also matters for equity and multi-asset investors. Country labels do not fully explain an investment's behaviour. Currency exposure, income sources and underlying portfolio construction all need to be considered. Our coverage of a Japan-focused investment trust offers another context in which investors may need to separate country exposure from the wider portfolio question.

Liquidity can justify accepting a lower return

Large investors do not only ask how much a bond yields. They also ask how easily it can be bought, sold or used as collateral.

A deep government bond market may allow institutions to execute large transactions with less disruption. Certain securities can also play an important operational role in cash management, derivatives arrangements and short-term funding.

For these investors, liquidity has economic value. A bond offering a slightly less attractive expected return may still be preferred if it can be traded efficiently during difficult market conditions.

Retail investors should apply a similar principle on a smaller scale. The advertised yield is not the complete return if dealing spreads, fund charges, hedging costs or poor liquidity absorb part of it.

Regulation and liabilities influence demand

Pension funds, insurers, banks and reserve managers do not operate like private investors selecting the bond with the highest available yield.

They may need assets with particular credit characteristics, maturities or currencies. Internal risk limits and regulatory frameworks can also affect how much capital they allocate to different holdings.

A pension fund might prioritise bonds whose cash flows resemble its future payment obligations. An insurer may value predictable income and specific maturity dates. A bank may need liquid securities for balance-sheet or collateral purposes.

These objectives can support demand for foreign government bonds even when domestic yields become more competitive.

A practical framework for comparing bond markets

Investors assessing domestic and overseas bonds can work through six questions:

1. What is the expected return in my home currency? Include possible currency movements or the cost of hedging.
2. How much duration risk am I taking? A higher yield may come with greater price sensitivity.
3. What role does the bond serve? Income, diversification, liquidity and liability matching are different objectives.
4. How strong is the market's liquidity? Consider dealing costs and the ability to exit under pressure.
5. What happens if my assumptions are wrong? Test changes in yields, currencies and hedging costs.
6. Am I comparing like with like? Maturity, credit quality, tax treatment and fund fees can distort a simple yield comparison.

The portfolio role matters more than the headline number

Rising domestic yields can make local bonds more competitive and may encourage some investors to reduce overseas exposure. They do not automatically eliminate the case for foreign bonds.

The proper comparison is between expected home-currency returns, risks and portfolio functions. Currency hedging can transform the income on offer, while duration, liquidity, diversification and institutional constraints may be just as important as yield.

For retail investors, the main lesson is straightforward: never select a bond or bond fund using its headline yield alone. First establish what risks generate that yield, how currency exposure is managed and what purpose the holding is meant to serve within the portfolio.