# Bond ETFs: How Rates, Duration, Yield, and NAV Fit Together

Understand what bond ETFs hold, why interest rates affect prices, how duration and credit spreads matter, and how to read yield, NAV, and discount data.

Canonical: https://wiki.fcontext.com/stocks/bond-etf/
Fact checked: 2026-07-14

> For educational purposes only; not investment advice.

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## Direct answer

A bond ETF is an exchange-traded fund that holds a portfolio of bonds, such as Treasury bonds, corporate bonds, municipal bonds, agency debt, or mortgage-backed securities. Investors buy fund shares, not a specific bond with a personal maturity date.

Bond ETFs can make fixed income easier to trade and diversify, but they do not remove interest rate risk, credit risk, liquidity risk, or execution risk. Their prices can rise or fall during the day, and the market price may differ from net asset value, especially when the underlying bond market is stressed.

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## How bond ETF prices move

Bond prices usually move in the opposite direction of market yields. If newly issued bonds offer higher yields, older fixed-coupon bonds must generally fall in price to remain competitive. Bond ETFs hold many such bonds, so their net asset values respond to changes in yield curves.

Duration is the quick sensitivity check. A portfolio with modified duration `6` may lose about `6%` if relevant yields rise by 1 percentage point, before convexity, income, credit spreads, and trading costs.

Bond ETFs also have credit spread exposure. An investment-grade corporate bond ETF can fall even when Treasury yields decline if corporate spreads widen enough. High-yield bond ETFs are often driven more by default expectations and risk appetite than by Treasury rates alone.

Yield labels are not interchangeable. Distribution yield looks at cash paid out. SEC yield focuses on a standardized recent income measure. Yield to maturity or yield to worst depends on portfolio cash-flow assumptions. None is a guaranteed future return.

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## Worked example

Fund A holds 1- to 3-year Treasuries and has duration `1.8`. Fund B holds long Treasuries and has duration `16`. If the relevant yield curve rises by `0.75%`:

`Fund A ≈ -1.8 × 0.0075 = -1.35%`

`Fund B ≈ -16 × 0.0075 = -12.00%`

Both are Treasury bond ETFs, but their rate sensitivity is very different.

Now consider total return. If an investor buys a bond ETF at `100`, receives `4` in distributions, and the year-end price is `94`, the rough pre-tax total return is:

`(94 + 4 - 100) / 100 = -2%`

The distribution was real cash flow, but it did not prevent a negative total return.

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## Practical checks

- Read the index or strategy: Treasury, aggregate bond, corporate, municipal, mortgage, high yield, or target maturity.
- Check effective duration, average maturity, convexity, and the update date.
- Compare yield metrics using the same date and same definition.
- Review credit quality distribution, not just an average rating.
- Watch bid-ask spreads, trading volume, fund size, and underlying bond liquidity.
- Use limit orders for large or sensitive trades; opening and closing periods can be noisy.
- Check whether the ETF is ordinary rolling exposure or a target-maturity product.
- Include fees and taxes when comparing after-tax outcomes.

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## Common misconceptions

Bond ETFs are not guaranteed principal products. Fund shares trade at market prices and can lose value.

A high distribution yield is not automatically better. It may reflect longer duration, lower credit quality, recent price declines, or special distributions.

Rate cuts do not guarantee all bond ETFs rise. Markets price expectations, curve segments, credit spreads, and future paths.

A discount to NAV is not automatically an arbitrage. The ETF price may be reflecting fresher information than stale underlying bond quotes.

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## Related topics

- [Exchange-Traded Funds](/stocks/etf/)
- [Bond Duration](/stocks/bond-duration/)
- [Bond Convexity](/stocks/bond-convexity/)

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## Sources

- SEC, "Investor Bulletin: Exchange-Traded Funds (ETFs)."
- FINRA, "Bond ETFs."
- Investor.gov, "Interest Rate Risk."