Bond Funds and Rising Rates
Bond Funds and Rising Rates
When interest rates rise sharply, bond funds fall in value. Unlike an individual bond held to maturity, a bond fund's losses are permanent. Selling at depressed prices locks in real loss. Even if rates later fall, the fund's NAV may never recover because the fund's allocation has changed—it now holds higher-yielding bonds purchased at lower prices.
Key takeaways
- Bond fund prices fall when rates rise; the size of the fall depends on duration and convexity
- An individual bond recovers to par if held to maturity, but bond fund shares do not
- The 2022 bear market saw aggregate bond funds lose 13% (their worst year on record), and the losses were permanent
- Rolling into higher yields is mathematically necessary but emotionally painful in a rising-rate environment
- Understanding this dynamic helps investors avoid panic selling at market bottoms
The duration mechanic: how much do prices fall
Duration measures price sensitivity to interest rate moves. For every 1% rise in yield, a bond with 5-year duration falls roughly 5% in price. For a fund with $100 billion under management and 5-year duration, a 1% rate jump causes a $5 billion loss in assets under management.
In 2022, the Fed raised rates from 0.25% to 4.33%, a move of over 4 percentage points. An aggregate bond fund (BND, AGG) with roughly 6-year duration should have fallen:
6 years × 4% rate increase = 24% price decline (approximately)
Actual returns: BND fell 13.0%, AGG fell 13.0%. The number is lower than the crude duration calculation because:
- Convexity — bonds gain convexity benefits (prices don't fall as much as duration suggests when yields rise sharply)
- Reinvestment gains — as bond coupons and maturing bonds are reinvested at higher rates, the fund's income stream grows (though this benefit takes years to fully materialize)
- Credit spreads — on some bonds, spreads widened less than average, limiting losses in certain sectors
But the core truth holds: rising rates hammer bond funds.
Why individual bonds differ from funds
Imagine you bought a 10-year Treasury in 2021 when yields were 1%. The coupon is 1%, the price is par ($1,000), and you hold it.
In 2022, yields rise to 4%. If you sell, the Treasury is now worth roughly $770 (you bought at a 1% yield; the market now pays 4%, so your 1% coupon is worth much less).
If you hold it to maturity (2031), you still get $1,000 back. The price loss is temporary. You can think of it as a temporary markdown on a bond you're holding to par recovery.
Now imagine the same 2021 scenario but in a bond fund. The fund holds thousands of 10-year Treasuries at 1% yield and $1,000 NAV. In 2022, rates rise to 4%. The fund's NAV drops to $770—not temporary, not on paper, but real.
At this point, here's the critical difference:
Individual bond: You hold to 2031, prices recover to par, you get $1,000 back. You can say "I'm down on paper, but I'll be whole at maturity."
Bond fund: There is no 2031 maturity for the fund. As the fund's old bonds mature, they're replaced with new bonds. Those new bonds yield 4%, not 1%. The fund's distribution drops from 1% to 4% (great for income, but a painful transition). The NAV stays depressed—it doesn't recover to the old $1,000 price because the fund now holds higher-yielding bonds that must be priced at current market rates.
The fund's NAV of $770 reflects fair value: it's holding bonds that yield 4%. If rates fall back to 1%, NAV recovers. But if rates stay at 4%, the NAV stays at $770 indefinitely. There is no "maturity date" on which par is guaranteed.
The 2022 case study: a real-world example
In December 2021, investors could buy BND (Vanguard Total Bond Market ETF) at $79 per share. The fund's distribution yield was roughly 1.2%. The Fed, fearing inflation, began raising rates.
By October 2022, BND had fallen to $74—a 6.3% decline. This was on top of the ~13% decline in the fund's assets under management from the rate shock itself. Investors who bought at $79 and held saw paper losses. Many panic-sold.
If an investor had held BND through 2024, the fund recovered toward $78–$79 as yields fell modestly and coupons accumulated. But investors who sold at the lows locked in a real loss and were forced to buy back into a higher-NAV fund later.
The broader point: bond funds don't have a maturity date that guarantees price recovery. The losses are permanent unless yields fall enough to offset them.
Why rolling into higher yields is mathematically good but emotionally hard
When a bond fund rolls from 1% yielding bonds into 4% yielding bonds, the fund's future income stream improves significantly. For a buy-and-hold investor, reinvesting coupons at 4% instead of 1% is excellent. Over 10 years, the compounding difference is substantial.
But the transition is painful. The fund's NAV drops. Investors see $100,000 become $87,000 on the statement. Even though the future income (distributions) is much higher, the current price loss feels like a real loss.
This is why behavioral finance matters. Investors who can't tolerate seeing NAV drop often sell at the worst time—when rates are highest, bonds are cheapest, and yields are most attractive.
The convexity factor in aggregate bond funds
Convexity is a technical term describing how bond prices change as yields move in very large steps. Most bonds have positive convexity: when yields fall a lot, prices rise more than duration predicts. When yields rise a lot, prices fall less than duration predicts.
Mortgage bonds in the aggregate market have negative convexity: homeowners refinance when rates fall, capping price gains. But this is a smaller effect in modern bond funds because mortgage allocations are smaller.
In 2022, the aggregate bond market's positive convexity meant that actual losses were smaller than a simple duration calculation would suggest. A fund with 6-year duration would naively suggest 24% loss in a 4% rate move. Real loss was 13%. Convexity and other factors made up the difference.
Rates, spreads, and credit losses
Aggregate bond funds hold both Treasuries and corporate bonds. In 2022, Treasuries yielded 4%, but corporate bonds had to yield 5–6% to compensate for higher default risk. This "credit spread" widened significantly—investors demanded more yield to hold corporate bonds because recession fears rose.
A bond fund holding 70% Treasuries and 30% corporates lost more than a 100% Treasury fund in 2022 because of credit spread widening. But the fund still recovered most losses by 2024 as spreads normalized.
For individual bond investors, this is important: diversified bond funds smooth out sector-specific losses. A fund holding a mix absorbs losses from all sectors and benefits from gains in any sector.
The long-term perspective: time and income matter
Here's a more hopeful framing: a bond fund investor who held BND through 2022 and into 2023–2024 saw price recovery, rising distributions, and acceptable long-term returns. Rates fell in 2023, NAV recovered, and the reinvested coupons from the higher-yield period compounded.
The investor who panic-sold in October 2022 and sat in cash while rates fell in 2023 missed the entire recovery and earned 1% in a money market fund instead of the 4–5% that bond fund coupons would have provided.
This is the classic trap: rising rates hurt bond fund investors short-term, but long-term investors who don't sell eventually benefit from the higher reinvestment rates and eventual price recovery (if rates fall) or acceptable real returns (if rates stay high but inflation moderates).
When rising rates are most painful
Rising-rate environments hurt bond funds most when:
- Rates rise sharply and quickly (like 2022)
- An investor has a short time horizon and needs to sell (forced selling locks in losses)
- The investor has no income need and sees no benefit from higher coupons (pure price decline is painful)
- Rates rise and stay high indefinitely (price recovery takes longer)
Rising-rate environments hurt bond funds least when:
- Rates rise slowly (investors have time to reinvest coupons)
- Rates then fall again (capital recovery occurs)
- The investor has a long time horizon (compounding coupons at higher rates matters)
- The investor reinvests distributions (higher future income buffers current price decline)
Next
Understanding how rates and bond fund prices interact prepares you to make the next decision: should you own bonds in a taxable brokerage account, or in a tax-sheltered account? Bond funds generate ordinary income (taxed at high rates) and periodic capital gains. The tax efficiency of bonds matters far more in a taxable account. The following article explains why.