How Bond Investing Works: Prices, Rates, and Why Holding to Maturity Matters

Why Bonds Deserve a Closer Look

Bonds are often the steady part of a portfolio: they pay regular income and tend to move less than stocks. But their prices still change every day, and a dip on your statement can be confusing if you're not sure why it happened.

This post walks through how bonds work from the ground up: what you're buying, how prices are set after a bond is issued, why rising interest rates push prices down, and what recent market moves mean for you. We use both individual bonds and bond ETFs in client portfolios, so we'll also explain how each one behaves when prices move.

A Bond is a Loan with a Written Contract

When you buy a bond, you are lending money. The borrower might be the U.S. Treasury, a city, or a company. In return, the borrower signs a contract promising two things: to pay you interest on a set schedule, and to repay the loan in full on a set date.

Think of it like a formal IOU with every term spelled out in advance. A few terms show up in every bond contract:

• Issuer: who is borrowing the money (Treasury, a municipality, a corporation).

• Par value (face value): the amount the issuer promises to repay at the end, usually $1,000 per bond.

• Coupon: the fixed interest rate the bond pays, stated as a percentage of par. A 4% coupon on a $1,000 bond pays $40 a year, often split into two $20 payments.

• Maturity date: the day the loan ends and par is repaid.

• Credit quality: how likely the issuer is to keep its promises. Rating agencies grade this, and lower-rated issuers generally have to pay higher interest to attract lenders.

  
  

The key point: once a bond is issued, its coupon and par value don't change. What changes is how much other investors are willing to pay for that contract.

Par, Discount, and Premium

A bond can trade at, below, or above its $1,000 par value. Bond prices are usually quoted as a percentage of par, so a price of 100 means $1,000, 97 means $970, and 103 means $1,030.

Term	Price vs. par	Example (per $1,000 bond)	What it usually signals
At par	Equal to par	Pay $1,000	The coupon roughly matches current rates for similar bonds
Discount	Below par	Pay $970	The coupon is lower than current rates, so buyers pay less
Premium	Above par	Pay $1,030	The coupon is higher than current rates, so buyers pay more

Here's a simple way to picture it. Imagine two rental contracts for the same apartment: one locks in rent at $1,500 a month, the other at $1,700. If you could buy the right to collect that rent, you'd pay more for the $1,700 contract. Bonds work the same way: a contract that pays more interest is worth more, and one that pays less is worth less.

Whether you buy at a discount or a premium, the issuer still owes par at maturity. A discount bond drifts up toward par as maturity approaches; a premium bond drifts down toward it. That pull toward par is a big part of why holding a bond to maturity matters, which we'll come back to below.

How Bonds are Priced After They're Issued

Most bonds are bought and sold between investors long before they mature. This is the secondary market, and it's where daily bond prices come from.

On the secondary market, buyers aren't asking "what's the coupon?" They're asking "what total return will I earn if I buy at today's price and hold until maturity?" That figure is called the yield to maturity (YTM). It combines the coupon payments with any gain (buying at a discount) or loss (buying at a premium) as the bond moves back to par.

A bond's price settles wherever its yield to maturity lines up with what similar bonds are paying today. The main things that move it:

• Interest rates: the biggest driver, covered in the next section.

• Time to maturity: longer bonds have more future payments exposed to rate changes.

• Credit quality: if an issuer's finances weaken, buyers demand a higher yield and the price falls.

• Supply, demand, and liquidity: some bonds trade often; others rarely, which can widen the gap between buying and selling prices.

  
  

Why Bond Prices Fall When Rates Rise (and Vice Versa)

When interest rates rise, existing bonds with lower coupons lose value, because new bonds now pay more. When rates fall, existing bonds with higher coupons gain value. Prices and rates move like two ends of a seesaw.

Say you own a 10-year bond with a 4% coupon, paying $40 a year. A month later, rates rise and new 10-year bonds pay 5%, or $50 a year. Nobody will pay you a full $1,000 for $40 a year when they can get $50 elsewhere. To sell, you'd have to lower your price until the buyer's total return is about 5%. The reverse is also true: if rates fall to 3%, your 4% bond becomes more attractive, and buyers will pay more than par for it.

Market rate for similar bonds	Approx. price of a 4%, $1,000 bond with 10 years left	Approx. price with 2 years left
3%	$1,086 (premium)	$1,019 (premium)
4%	$1,000 (par)	$1,000 (par)
5%	$922 (discount)	$981 (discount)

Hypothetical example for illustration only; assumes semiannual coupons and no change in credit quality. Not a representation of any actual security.

Notice the second and third columns. The same 1% rate move changes the 10-year bond's price far more than the 2-year bond's. Longer bonds have more years of below-market (or above-market) payments ahead of them, so they're more sensitive. Investors measure this sensitivity with a number called duration: roughly, a bond with a duration of 7 would lose about 7% of its value if rates rose 1%, and gain about 7% if rates fell 1%.

What's Happening in the Bond Market Right Now

Bond prices have fallen this fall because interest rates have climbed quickly. The 10-year Treasury yield rose about 0.54 percentage points in September alone, and in early October it briefly touched roughly 5.35%, its highest level since 2002 (Nuveen; FRED).

A few forces have pushed rates up at once:

• The Fed raised rates. In September, the Federal Reserve raised its target range by 0.25% to 3.75%–4.00%, its first increase since 2023, citing inflation that has stayed above its 2% goal.

• Energy prices and inflation worries. Oil prices tied to Middle East tensions have kept inflation concerns elevated.

• Heavy borrowing. Large government deficits and a wave of new corporate bonds mean more supply for investors to absorb, which tends to push yields higher.

  
  

This is the seesaw from the last section at work. The broad U.S. investment-grade bond market (the Bloomberg U.S. Aggregate Index) returned about -2.6% in September and about -2.9% for the year through October 2 (Nuveen). Longer-term bonds, including many municipal bonds, generally fell more than shorter-term ones.

There's another side to this. Higher yields mean new bonds, and reinvested coupon payments, now earn more income than they did a year ago. No one can reliably predict where rates go next, and they could keep rising in the near term.

Index returns are shown for illustration only, do not reflect fees, and cannot be invested in directly. Past performance does not guarantee future results. Market data as of early October 2026.

Individual Bonds vs. Bond ETFs: What a Price Drop Means for Each

If you own individual bonds and plan to hold them to maturity, a price drop on your statement is generally a temporary, "paper" change. As long as the issuer makes its payments, you still collect every coupon on schedule and receive par value at maturity. The price you see today only matters if you sell before then.

That said, holding to maturity doesn't make a rate increase cost-free. Until the bond matures, your money stays tied to its original coupon, which may now be below what new bonds pay. That gap is a real opportunity cost: the income you give up by not reinvesting at today's higher yields. Par is also a fixed dollar amount, so inflation can reduce what that money buys by the time it's repaid. Whether to hold a bond or sell it and reinvest depends on its remaining term, its coupon versus current yields, taxes, transaction costs, and your cash needs, and it's a trade-off worth evaluating rather than assuming.

Back to the contract comparison: if you lend a neighbor $1,000 for five years at 4%, the terms of that IOU don't change just because rates elsewhere went up. Someone else might pay you less than $1,000 to take over the IOU today, but if you hold it, the neighbor still owes you $1,000 at the end. The main risk to that promise is the borrower failing to pay, which is why we focus on credit quality when selecting individual bonds.

Bond ETFs work differently, and it's worth understanding both since we use them together:

	Individual bond (held to maturity)	Bond ETF
Maturity date	Yes, a fixed end date	No; the fund continually buys and sells bonds to keep a target maturity range
What you get back	Par value at maturity, if the issuer doesn't default	Whatever the shares are worth when you sell
Effect of rising rates	Price dips temporarily; drifts back toward par as maturity nears	Price dips; recovery comes over time through higher income as the fund buys new, higher-yielding bonds
Diversification	One issuer per bond	Hundreds or thousands of bonds in one holding
Trading	Can be less liquid; prices vary by dealer	Trades on an exchange throughout the day

Because a bond ETF never "matures," its price doesn't automatically return to a set value. Instead, when rates rise, the fund reinvests maturing bonds and coupons at the new, higher yields, which raises its income over time. That higher income can help offset the earlier price decline, but there's no fixed date or amount you're guaranteed to get back.

Each tool has a role. Individual bonds offer predictable, scheduled cash flows for specific needs and dates. ETFs add broad diversification and flexibility. We use both to match your portfolio to your income needs, time horizon, and comfort with price swings.

Neither approach removes risk, and both can lose value. Individual bonds concentrate exposure in a single issuer, may be called (repaid early) by the issuer, often when rates fall and reinvestment options are less attractive, and can be costly or difficult to sell before maturity because of dealer markups and limited trading. Bond ETFs charge ongoing fund expenses that reduce returns, can trade at a premium or discount to the value of the bonds they hold, especially in volatile markets, and have no maturity date or guaranteed return of principal; selling shares after a price decline makes that loss permanent. The right mix depends on your circumstances, and we review these trade-offs with you as part of managing your portfolio.

The Bottom Line

When rates rise, bond prices fall; that's how the math works, not a sign that something is broken. For individual bonds held to maturity, those price swings are generally temporary, because the issuer still owes you par at the end. For bond ETFs, recovery tends to come through higher income over time rather than a fixed payoff date.

If you'd like to see how your bonds are positioned, including maturity dates, credit quality, and how your ETFs fit in, feel free to give us a call or schedule a review meeting with us. We're glad to walk through it with you.