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The practical comparison is between an individual Treasury’s yield to maturity, a corporate bond’s yield to maturity or yield to worst, and a bond fund’s 30-day SEC Yield together with its duration and expense ratio. Those figures describe different cash-flow structures, so a single “highest yield” ranking is misleading.
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The three products do not quote the same kind of yield
Before comparing percentages, identify what each percentage measures and whether it is gross or net of expenses. The following table sets the baseline.
| Dimension | Treasury security | Corporate bond | Bond mutual fund or ETF |
|---|---|---|---|
| Comparable yield | Treasury constant-maturity (CMT) benchmark or the exact security’s yield to maturity | Yield to maturity and, when callable, yield to worst | 30-day SEC Yield, read with duration and expense ratio |
| Main credit exposure | U.S. Treasury issuer and market-price risk before maturity | Issuer default, downgrade and credit-spread risk | Credit risk across portfolio holdings; a Treasury-only fund still has interest-rate risk |
| Rate sensitivity | Remaining maturity and duration | Duration plus changes in the issuer’s spread over Treasuries | Portfolio duration changes over time; there is no investor maturity date |
| Cash-flow certainty | Stated coupon schedule and maturity for an individual note or bond | Coupon and maturity can be changed by a call or impaired by default | Distributions vary; shares are sold at market price or net asset value |
| Costs and taxes | Purchase price, bid-ask spread and federal tax; Treasury interest is generally exempt from state and local income tax | Bid-ask spread, commissions and ordinary taxable interest | Expense ratio, trading spread and potentially taxable distributions |
Step 1: choose the correct yield convention
Treasury CMT is a benchmark, not a bond you can buy
The U.S. Treasury’s par yield curve relates a par yield to time to maturity. Treasury constant-maturity (CMT) rates are read from that daily curve and represent “bond equivalent yields” for securities that pay semiannual interest. They are simple annualized rates, not annual percentage yields (APYs), and they may not equal the yield on any one security.
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The curve is built from closing market bid prices for recently auctioned Treasury securities. It is useful for comparing a five-year point with another five-year point, but it is not a quote for the exact note in your account. Treasury bill quotations in the Treasury’s daily interest-rate statistics are obtained at approximately 3:30 p.m. from Federal Reserve Bank of New York market quotations, so the published snapshot has a defined time and can differ from an intraday quote.
Use yield to maturity for a specific Treasury purchase
When you are deciding whether to buy a particular Treasury note or bond, use that security’s yield to maturity (YTM), calculated from its price, coupon payments and maturity date. Treasury notes and bonds pay interest every six months. If the market price is above par, the buyer accepts a lower yield than the coupon rate; if it is below par, the yield is higher. YTM is the annual rate of return implied by holding the security to maturity, assuming scheduled payments occur and coupons can be reinvested at the calculation’s assumed rate.
Do not substitute a CMT number for the exact bond’s YTM when comparing a purchase order. A CMT point is a standardized market reference; an individual bond’s YTM reflects its actual price, coupon, settlement date and remaining cash flows.
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Use YTM and yield to worst for corporate bonds
A corporate bond is a loan to the company issuing it. Its YTM assumes the bond remains outstanding until its stated maturity and that all payments are made. If the issuer can redeem the bond early, calculate yield to call for each meaningful call date and use yield to worst (YTW)—the lowest yield among the realistic call and maturity outcomes—as the conservative comparison.
Corporate yields commonly exceed comparable Treasury yields because buyers demand compensation for default, downgrade and liquidity risk. The difference, or credit spread, is compensation for those risks and can widen even when Treasury rates are unchanged. A higher coupon or YTM is therefore not a guaranteed enhancement over a Treasury.
Use the 30-day SEC Yield for a bond fund
The Securities and Exchange Commission’s standardized SEC Yield approximates the current income generated by a fund’s portfolio over a historical 30-day period after expenses. It is annualized as a percentage of the fund’s offering price. Because expenses are already deducted, compare it with an individual-bond yield only after allowing for the individual bond’s commissions, bid-ask spread and other trading costs.
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SEC Yield is an income snapshot, not a promised future return. It does not guarantee that distributions will remain at that level, that the fund will return your principal, or that you can hold the fund until a stated date and receive par value. A fund’s share price can rise or fall daily, and its distributions can change as holdings mature, are sold, or are replaced.
Step 2: match maturity or duration before comparing percentages
Why maturity alone is insufficient
Two bonds both labeled “10-year” can have different interest-rate exposure if one was issued recently and the other has a different coupon and remaining cash-flow pattern. Compare duration—the approximate percentage change in price for a one-percentage-point change in market yields—alongside maturity.
For an individual bond, duration changes as time passes and as its price and coupon change. For a fund, the manager continually replaces holdings, so portfolio duration can move even if the fund’s name or target category stays the same. A fund also has no single maturity date at which all shares are redeemed at par.
Use a duration-matched comparison
Suppose a Treasury, a corporate bond and a fund each have an effective duration of about five years. A parallel one-percentage-point rise in rates would imply an approximate five-percent price decline before convexity, spread changes, income and other effects. That illustration is a sensitivity estimate, not a forecast. If the corporate bond’s spread widens at the same time, its loss can exceed the Treasury’s; if spreads tighten, it can outperform.
Longer-duration instruments generally move more for a given rate change. The SEC’s mutual-fund guidance warns that longer-term bond funds tend to have greater interest-rate sensitivity, and even a fund holding only U.S. Treasury bonds can lose money when rates rise because the market value of its holdings falls.
Step 3: separate credit, spread, call and liquidity risk
Treasuries: low issuer credit risk, real market-price risk
An individual Treasury has the credit exposure of the U.S. government, but it is not risk-free at every holding period. Selling before maturity exposes you to the market price, which can be below your purchase price when rates rise. Inflation-linked Treasury securities add a different comparison: Treasury began publishing its TIPS real-yield series on January 2, 2004. A TIPS real yield should not be compared directly with a nominal Treasury, corporate YTM or fund SEC Yield without accounting for inflation expectations and the different yield conventions.
Corporates: default and spread risk are separate from rate risk
Check the issuer’s current credit rating, financial condition, seniority, covenants and industry concentration. Investment-grade and non-investment-grade bonds can have the same maturity but very different expected loss. Investor.gov notes that non-investment-grade bonds generally offer higher interest rates to compensate for greater risk.
Track the spread to a duration-matched Treasury rather than looking only at the absolute yield. A spread can widen after a downgrade, weak earnings, a sector shock or a liquidity event. That repricing can reduce the bond’s market value even if Treasury yields are unchanged. A single corporate bond also concentrates your exposure in one issuer, unlike a diversified fund.
Call and prepayment risk can change the outcome
A callable corporate bond may be redeemed when rates fall, precisely when you would prefer to keep its higher coupon. Compare YTW with YTM and read the call schedule, call price, notice provisions and any make-whole language. Mortgage-backed and other prepayable holdings in a bond fund have analogous prepayment risk: principal can return early when rates fall, forcing reinvestment at lower yields.
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A bond fund spreads credit exposure across its holdings, which can reduce the damage from one issuer’s default. It still bears portfolio-wide credit, interest-rate, liquidity and prepayment risks. The SEC’s fund guidance identifies all four categories. A Treasury-only fund removes corporate default exposure but can still lose value when rates rise, and its duration can change as the manager trades.
Step 4: compare cash-flow certainty and the way you get your money back
Individual securities have a stated schedule
For a Treasury or corporate bond that is held to maturity and pays as promised, you know the coupon dates and principal repayment date. That schedule supports a liability-matching plan, such as funding a tuition payment in a particular year. The market value still fluctuates before maturity, and a corporate default or call can interrupt the schedule.
Funds have distributions, not a maturity promise
A fund distributes interest and realized gains according to its policy, but the amount can vary. You exit by selling shares at the current market price or, for a mutual fund, at the next calculated net asset value. There is no contractual date when the fund returns a fixed principal amount. For a goal with a hard date, compare the fund’s duration and liquidity with an actual maturity ladder rather than treating its SEC Yield as a maturity return.
Step 5: put taxes and every cost on the same basis
Treasury tax treatment
TreasuryDirect states that Treasury interest is paid every six months and that federal tax is due each year on interest earned. Treasury interest is generally exempt from state and local income tax, but confirm the current treatment for your state, account type and tax forms. Tax rules can change, and individual circumstances matter.
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Corporate-bond and fund taxes
Corporate-bond interest is generally taxable as ordinary income. A bond fund can distribute ordinary income, capital gains from trading and, depending on its holdings, income with different tax characteristics. Read the fund’s tax supplement and your account’s reporting documents rather than assuming the SEC Yield equals your after-tax return.
Include costs that headline yields omit
- Individual bonds: subtract the effect of the bid-ask spread, commissions, markups or markdowns and any custody charge. A quoted YTM normally does not deduct your brokerage costs.
- Funds: SEC Yield is already after the stated expense ratio, but you still pay any trading spread, commission or account fee. The expense ratio reduces assets continuously and can change your net outcome over long holding periods.
- Taxes: calculate the yield that remains in your own tax bracket and account. A lower pretax Treasury yield can produce higher after-tax income than a taxable corporate or fund yield.
A repeatable comparison worksheet
Use this sequence whenever you evaluate alternatives. Record the date and source of every figure because yields change daily.
- Define the goal and holding period. Decide whether you need a known maturity date, ongoing income, liquidity or diversification.
- Choose the rate point. Match remaining maturity for individual securities or effective duration for funds. Do not compare a two-year Treasury with a ten-year fund simply because both show annualized yields.
- Identify the convention. Label each number as CMT, exact-security YTM, corporate YTM, corporate YTW or 30-day SEC Yield. Do not mix a CMT benchmark with a fund’s distribution yield.
- Gather the risk data. Record Treasury or corporate issuer, credit rating, seniority, call and prepayment provisions, fund credit mix and duration.
- Convert to a net figure. Deduct expense ratios, expected trading costs and applicable taxes. Keep one-time transaction costs separate from recurring costs.
- Stress the price. Estimate the effect of a parallel rate move using duration. For corporates, run a second case in which the credit spread widens; for callable or prepayable holdings, examine an early-redemption case.
- Check liquidity. Look at the quoted bid-ask spread, trading volume and the time you may need to sell. A fund’s exchange listing does not guarantee a narrow spread in a stressed market.
- Decide whether the extra yield pays for the extra risk. If the spread is small after taxes and costs, a Treasury may be the more efficient choice. If diversification or income flexibility matters, a fund may justify a different yield even without a maturity date.
How to read the numbers without common mistakes
Do not compare coupon rates with yields
The coupon is the stated interest rate on a bond’s face value. YTM incorporates the price you pay and any gain or loss between that price and par. A premium bond can have a coupon above its YTM; a discount bond can have a coupon below its YTM.
Do not treat SEC Yield as a guaranteed return
The 30-day period is historical and annualized. Holdings, market prices, expenses and distributions can change immediately afterward. Use SEC Yield to compare current portfolio income under a common SEC formula, then use duration and total-return scenarios to assess risk.
Do not use a Treasury curve point as a tradeable quote
CMT rates are curve references derived from market bids. Your executable price depends on the exact CUSIP, settlement time, accrued interest and dealer or platform spread.
Do not ignore the call schedule
For a callable corporate bond, YTM can overstate the return if the issuer is likely to redeem early. YTW makes the adverse call outcome visible. A fund’s holdings can also be called or prepaid, changing future income.
Do not assume diversification means stable principal
A diversified fund can reduce single-issuer default risk while still losing market value from a rate shock. Diversification changes the pattern of risk; it does not create a maturity guarantee.
Choosing the comparison that fits your objective
When a known payment date matters most
Start with individual Treasuries or a carefully constructed bond ladder whose maturities align with the liabilities. Compare each security’s exact YTM, price and tax treatment. A fund can be appropriate only if you accept selling at an uncertain market price when the payment is due.
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Compare a duration-matched corporate YTW with a Treasury YTM, then inspect ratings, issuer concentration, seniority and liquidity. The relevant question is whether the after-tax spread compensates you for expected default and downgrade losses, not whether the headline yield is larger.
When diversification and easy trading are priorities
Use the fund’s SEC Yield, duration, credit-quality breakdown, turnover, expense ratio and trading spread as a package. Review how the portfolio responds to rate increases, spread widening and prepayments. A low-cost fund can be operationally simpler, but its variable distributions and lack of a maturity date must fit your plan.
Keeping the comparison current
Treasury and fund yields move with market prices, and a fund’s SEC Yield is recalculated from a recent 30-day period. There are no permanent “current yield” numbers. On the day you make a decision, obtain the latest official Treasury interest-rate table, the exact security quote and the fund prospectus or regulatory yield display. Note the observation time, settlement date, duration, expenses and tax assumptions in your worksheet.
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