ETF základy
Bond ETFs: How They Work and Who They Suit
Key takeaways
- Bond ETFs hold a basket of bonds and respond to changes in interest rates — when rates rise, prices fall.
- Duration measures sensitivity to interest rates: the longer the duration, the more the price fluctuates.
- For conservative investors or as a counterweight to equities, bond ETFs can reduce the overall volatility of a portfolio.
- The return on bond ETFs is generally lower than on equity ETFs — the trade-off for lower volatility.
- Irish-domiciled UCITS bond ETFs are accessible from the Czech Republic and subject to standard tax rules.
Bond ETFs are funds that hold a basket of bonds — government, corporate, or a combination — and allow investment in the debt market as easily as in equities. They are a key tool for portfolio diversification and reducing overall volatility.
How bond ETFs earn
Income comes from two sources: coupon payments from the bonds in the portfolio and price movements of the bonds themselves. A bond's price moves inversely to interest rates — when the central bank raises rates, the price of existing bonds falls because new bonds will offer a higher yield.
What is duration and why does it matter
Duration (modified duration) expresses the sensitivity of a bond or fund to a change in interest rates. A fund with a duration of 5 years will fall by approximately 5% when rates rise by 1%. Short-term bond ETFs have a duration of 1–3 years and are therefore less sensitive. Long-term bond ETFs with a duration of 15–20 years behave more volatilely.
Types of bond ETFs
- Government bonds — lowest default risk, lower yields
- Corporate bonds (investment grade) — slightly higher yield, higher risk
- High-yield corporate bonds — higher yield, but significantly higher default risk
- Inflation-linked bonds (TIPS, linkers) — protect against inflation, more complex behaviour
Who are bond ETFs suited to
A bond allocation makes particular sense for investors approaching their goal (e.g. retirement in 5–10 years), for those who cannot tolerate strong portfolio fluctuations, or as a complement to the equity portion to reduce overall risk. In a purely equity portfolio they are unnecessary if you have a long horizon and can tolerate volatility. The basics of portfolio construction are in the article how to build your first portfolio.
This is not investment advice.
FAQ
How do bond ETFs earn?
From coupon payments of the bonds in the portfolio and from their price movements. A bond's price falls when interest rates rise and rises when they fall. Total return combines both components.
What is duration on a bond?
Duration expresses sensitivity to changes in interest rates. A fund with a duration of 5 years will fall by approximately 5% when rates rise by 1%. Shorter duration means less sensitivity and lower price volatility.
Are bond ETFs suitable for beginners?
It depends on the goal. A beginner with a long horizon (15+ years) generally does not need bonds — equity ETFs have historically delivered higher returns. Add bonds when you are approaching your goal or want to reduce volatility.