Investing - Theory, News & General • Explain target-date bond funds to me like I'm 5

If I buy a $1000 10-year bond at issue now with a 5.6% coupon, I can expect a reliable $56 per year in interest payments. I also expect that if prevailing interest rates for bonds maturing in 2036 go up to 10%, the bond's market value would drop significantly, but I'd still get my $1000 back in 2036. It's this feature of individual bonds that makes them preferable to typical bond funds for liability matching: if I have a known expense in 2036, I don't want to discover that the shares of a bond fund I own are worth much less than when I bought them.

My question is whether target-date bond funds work the same way - and if not exactly the same way, how are they different from buying an individual bond? Let's say I buy $1000 worth of a target-date bond ETF that matures in 2036, such as iShares IBCB or Vanguard VBCJ. It has a 5.6% SEC yield so I can expect roughly that amount per year. But what happens if the demand for the ETF changes significantly? My understanding is that to maintain the market value close to NAV, the people who run the fund add or subtract the shares available to trade on the secondary market. They would need to buy more bonds that mature in 2036 if demand increases, and sell some of the underlying bonds if demand decreases. Because of this buying and selling, wouldn't the composition of the fund change, meaning that the average bond yield changes, meaning that I can't necessarily expect 5.6% per year until 2036 - it could be more or less?

Similarly, aside from dividends, how closely can I expect the amount I receive when the fund liquidates in 2036 to match the amount I invested today? What could cause the two values to differ?

Statistics: Posted by snic — Sat Aug 15, 2026 7:11 pm