Is a 5% Treasury Yield Too Good to Be True?

Market levels are closing figures for October 9, 2026, from the US Treasury and FRED, with live values on the Summitward markets page. Every after-tax figure assumes the stated tax rate and inflation rate; change either and the result moves.

The ten-year Treasury closed at 5.24% on October 9, 2026. It first closed at 5% on September 15, and it has closed at 5.11% or higher on every trading day since September 23.¹ The ten-year did not close at or above 5% on a single day from 2008 through 2025; its October 2023 peak close was 4.98%.²

So is a 5% yield from the US government too good to be true? The yield is real. Buy a ten-year note at 5.24%, hold it to maturity, and the Treasury pays every coupon and returns your principal. What that contract fixes is the number of dollars you get back. It does not fix what those dollars buy, how much of the coupon you keep after tax, what a bond fund earns, or whether stocks do better over the same ten years.

What a 5% Treasury locks in

A ten-year note bought at a 5.24% yield pays a fixed coupon every six months and $1,000 per bond at maturity. The yield to maturity is the internal rate of return on those payments. You earn exactly that compound rate if you reinvest each coupon at 5.24%; spend the coupons or reinvest them at a different rate and your realized rate differs a little. A zero-coupon Treasury STRIP removes even that gap, because there are no coupons to reinvest.

A bond fund makes no such promise. It never matures, and it sells bonds as they shorten to keep its duration roughly constant. Over one year its return is approximately

R_{\text{1 yr}} \;\approx\; y_0 \;-\; D \times \Delta y

where $y_0$ is the starting yield, $D$ is the fund’s duration and $\Delta y$ is the change in yields over the year. iShares’ 7 to 10 year Treasury ETF (IEF) had an effective duration of 6.85 years and a 30-day SEC yield of 5.03% on October 8.³

Ten-year yields over the next year	Note held to maturity	Fund with 6.85-year duration, year one
Fall 1 point	5.24% a year to 2036	about +12.1%
Unchanged	5.24% a year to 2036	about +5.2%
Rise 1 point	5.24% a year to 2036	about −1.6%
Rise 2 points	5.24% a year to 2036	about −8.5%

Fund column: 5.24% minus 6.85 times the yield change, before expenses. A first-order approximation that ignores convexity and changes in curve shape.

The fund’s loss in a rising-rate year is not permanent. Martin Leibowitz, Anthony Bova and Stanley Kogelman showed that a fund that holds its duration steady earns close to its starting yield over a horizon of about $2D - 1$ years, because the higher yields it reinvests at make up for the price loss.⁴ For IEF that horizon is about 13 years. A fund therefore approximates the locked-in yield only if you hold it for longer than the note itself would run.

What taxes and inflation leave

Treasury interest is taxed as ordinary federal income every year and is exempt from state and local income tax.⁵ For a household in the 32% bracket that also owes the 3.8% Net Investment Income Tax, the combined federal rate on the coupon is 35.8%.⁶ That leaves 3.36% of the 5.24% yield in a taxable account.

What 3.36% buys depends on inflation. The ten-year breakeven, the gap between the nominal and TIPS yields, was 2.33% on October 9.⁷ If inflation averages that rate, the note returns about 1.0% a year after tax and inflation for this household. Consumer prices rose 3.40% in the year to August 2026.⁸ If inflation averages 3.40% for the next ten years, the same household collects every dollar the Treasury promised and ends with slightly less purchasing power than it started with. In this tax bracket, any average inflation above 3.36% leaves the note with a negative real return.

The arithmetic, with $y$ the yield, $t$ the federal tax rate on interest and $\pi$ average inflation:

r_{\text{real, after tax}} \;=\; \frac{1 + y\,(1 - t)}{1 + \pi} - 1 \;=\; \frac{1 + 0.0524\,(1 - 0.358)}{1.0233} - 1 \;\approx\; 1.0\%

The real return reaches zero when $\pi = y\,(1 - t)$ , which is 3.36% for this household.

The state exemption claws some of this back against the obvious alternatives. CD and savings interest is taxed by the state. A CD taxed at state rate $s$ as well must pay $y\,(1 - t)/(1 - t - s)$ to match. With a 5% state income tax on top of the 35.8% federal rate, that is about 5.68%. Inside an IRA, 401(k) or Roth the coupon compounds without a yearly tax bill, which is why bonds usually belong there first.

Try it: what a 5% Treasury leaves you

Set your bracket, state and an inflation assumption. The bottom panel holds the same yield in a fund and shows the one-year price effect of a rate move.

What a locked-in 5% to 7.65% earned buyers in 1968 to 1974

Ten-year Treasuries first paid 5% or more for years on end in the late 1960s. The year-end ten-year yield was above 5% at the end of every year from 1967 through 1997.⁹ We took each start year, bought a hypothetical ten-year note at par at the prior year-end yield, held it to maturity with coupons reinvested in three-month T-bills, and compared it with the S&P 500 over the same ten years. The data are Aswath Damodaran’s annual series for yields, returns and CPI inflation.

Bought at start of	Yield locked in	Inflation, next 10 yrs	Note, nominal	Note, real	S&P 500, nominal	S&P 500, real
1968	5.70%	6.24%	5.71%	−0.50%	3.65%	−2.44%
1969	6.03%	6.67%	6.02%	−0.60%	3.24%	−3.21%
1970	7.65%	7.36%	7.42%	0.05%	5.92%	−1.35%
1971	6.39%	8.05%	6.71%	−1.24%	8.50%	0.42%
1972	5.93%	8.62%	6.64%	−1.83%	6.55%	−1.91%
1973	6.36%	8.67%	7.15%	−1.40%	6.70%	−1.81%
1974	6.74%	8.17%	7.50%	−0.61%	10.56%	2.22%

Annualized ten-year returns before tax. Computed by Summitward from Damodaran, histretSP.xls (January 2026 release). Nominal note returns run slightly above the starting yield because T-bill rates rose above the coupon during the decade.

The contract held. Every buyer got the yield they locked in, and in dollars the note beat stocks in five of these seven windows. In six of the seven, the note still lost purchasing power before tax, because inflation averaged 6.2% to 8.7% a year. A buyer in a high bracket did worse; the tax was charged on the full nominal coupon, including the part that only replaced inflation. Stocks did not rescue anyone either: the S&P 500 lost purchasing power in five of the seven windows. The 1970s hurt both assets, which matches the UBS Global Investment Returns Yearbook finding that in years that combined high inflation with low growth, real equity returns averaged −4.7% and real bond returns −8.6%.¹⁰

Buyers who locked in after 1975 did well. The note bought at the start of 1980 at 10.39% returned 4.26% a year after inflation, and stocks returned 11.65%. Across all 89 ten-year windows from 1928 through 2016, the starting yield had a 0.98 correlation with the note’s nominal return, 0.67 with its real return, and 0.04 with the real return on stocks. The starting yield told buyers almost exactly how many dollars they would get, much less about what those dollars would buy, and close to nothing about stocks.

Did stocks still win when yields started high? In the 34 start years with a year-end yield of 5% or more (1968 to 1998 and 2000 to 2002), stocks beat the held-to-maturity note in 26. In the 55 lower-yield start years they won 48. The windows overlap, so these 89 windows contain only about ten independent decades, and one inflation episode and one long bull market dominate the high-yield group. These counts describe one country’s history; they do not give bonds a fixed 1 in 4 chance whenever yields reach 5%.

One thing has changed since 1974. TIPS did not exist until 1997. Today the ten-year TIPS yields 2.91% above CPI inflation, and the 30-year TIPS 3.32%.¹¹ TIPS principal rises with the CPI and cannot fall below its original amount at maturity.¹² A saver who wants the guarantee to cover purchasing power, which is what the 1970s buyers needed, can now buy it directly.

Did higher yields change the case for stocks?

A higher safe yield raises the bar stocks must clear, and stock prices usually adjust so that expected returns rise too. Damodaran estimates the premium the market is pricing above Treasuries each month. On September 1, 2026 his implied equity risk premium was 4.14% on a 4.75% Treasury rate. On October 1 it was 4.20% on a 5.29% rate.¹³ The bar rose 0.54 points and his estimate of what stocks are priced to return over it was almost unchanged. His average implied premium from 1960 through 2025 was 4.25%. Other methods give lower numbers; his own normalized-earnings version was 3.30% in October. The premium is a model estimate, and it is the number to watch.

In the Merton framework the share of a portfolio in stocks depends on the premium over the safe asset, your risk aversion and stock volatility. The level of the safe yield does not appear. If the premium is roughly unchanged, a return-maximizing investor’s stock share is roughly unchanged too; the whole portfolio is simply expected to earn more. The derivation is in The Merton Share.

Higher yields do predict lower stock returns relative to bonds on average. In their 2024 review of 46 proposed predictors of the equity premium, Amit Goyal, Ivo Welch and Athanasse Zafirov found that “higher fixed-income yields predict lower equity premiums.” Investment strategies that timed the market on Treasury-bill or long-bond yields “neither earned higher rates of return than the all-equity-all-the-time alternative,” and the T-bill version lost money in absolute terms in all four strategies they tested.¹⁴ The signal exists, and it was too weak to trade on.

One comparison will tempt you. FactSet put the S&P 500 at 19.1 times forward earnings on October 9, an earnings yield of about 5.2%, roughly the same as the ten-year.¹⁵ Comparing the two is the “Fed model,” and Goyal, Welch and Zafirov “dismiss ygap as a useful predictor.” An earnings yield is a real quantity that grows with the economy; a Treasury yield is a fixed nominal one. Why the comparison fails is covered in Why Stocks Can Rise When Interest Rates Rise.

When selling stocks for Treasuries makes sense

The case for owning more Treasuries is strongest when the bond is paying for something specific. Return forecasts are the weak reason.

You have dated spending. A down payment in three years or tuition in five has a fixed dollar amount and a date. A Treasury maturing near that date pays a known number of dollars at that time. Stocks can be down 30% the year you need the money.
You are funding a retirement income floor. For spending that must keep pace with prices, TIPS match the liability better than nominal notes. At a 2.91% ten-year real yield, a dollar of inflation-adjusted spending ten years out costs about 75 cents today; at the −1.19% real yield of August 2021 it cost more than a dollar. Building one is covered in How to Build a TIPS Ladder and sizing one in How Much of Your Retirement Should Be a Guaranteed Income Floor?.
You already have enough. If your portfolio funds the life you want at safe yields, taking stock risk adds upside you may not need and downside you cannot easily repair. A higher safe yield makes this easier to reach.
Your current allocation is more risk than you can hold. If the next 30% drop would make you sell, a smaller stock share you keep beats a larger one you abandon.

When to keep the stocks

Your horizon is long and you are still saving. The premium Damodaran estimates is near its long-run average, and the historical record over long horizons favors stocks: 6.6% a year real for US equities from 1900 through 2025, against 1.6% for long bonds.¹⁰ Your stock share should track the premium and your capacity for risk; a higher Treasury yield alone does not change either one.
The stocks sit in a taxable account with large gains. A household in the 32% bracket that owes the NIIT generally pays 15% plus 3.8% on long-term gains.¹⁶ Selling $100,000 of a fund bought for $50,000 costs $9,400 in federal tax up front, leaving $90,600 to buy Treasuries. Some of that gain would be taxed later anyway; some could be erased by a step-up in basis at death or by giving the shares away. The options are laid out in There Are Only Four Things You Can Do With a Capital Gain.
You are really betting on rate cuts. Buying long bonds because you expect the Fed to cut is a duration trade. Today’s long yields already price the expected path of policy, and the ten-year does not move in step with the federal funds rate. The price of a long-bond fund like TLT, with a 14.68-year duration, falls roughly 15% if long yields rise one more point.¹⁷

How to make the shift if you decide to

Change the target before you trade. Decide the stock and bond split you want from your goals and spending dates, then treat the trade as implementation.
Move inside retirement accounts first. Swapping a stock fund for Treasuries in an IRA or 401(k) triggers no tax, and the coupon is sheltered there.
Use new money before old. Direct new contributions and dividends to bonds until you reach the target. The rebalancing bands in How Often Should You Rebalance? keep this from turning into a stream of small trades.
Match the maturity to the date of the spending. Money needed within a year belongs in T-bills; the two-year note yielded 4.80% and the five-year 5.02% on October 9.¹ Buy an individual note or TIPS when the date matters, and a fund when it does not.
Keep the stock side diversified. Whatever share stays in stocks belongs in a global index fund rather than in the S&P 500 alone.

Key takeaways

The 5% is contractual in dollars. A ten-year note bought at 5.24% on October 9, 2026 and held to maturity pays that nominal yield. A bond fund does not lock it in.
Tax and inflation decide what you keep. At a 35.8% federal rate in a taxable account, the note leaves 3.36%, about 1.0% real if inflation averages the 2.33% breakeven, and nothing real if inflation averages 3.36% or more.
The 1970s buyers kept the promise and lost purchasing power. In six of seven ten-year windows starting 1968 to 1974, a note locked in at 5.70% to 7.65% lost value after inflation, before tax. Stocks lost too in five of the seven.
The equity premium barely moved. Damodaran’s implied premium was 4.14% on September 1 and 4.20% on October 1, 2026, while the Treasury rate he uses rose from 4.75% to 5.29%.
Buy Treasuries for a job. Dated spending, an income floor in TIPS, or a portfolio that is already enough. Shift inside retirement accounts and with new money before selling taxable winners.

See what a safer allocation does to your plan

Summitward's retirement planner lets you change your stock and bond mix and see how your projected spending and success rate move, so you can test a shift before you trade.

Open the retirement planner

Frequently asked questions

Is a 5% Treasury yield guaranteed?

The nominal payments are. Hold an individual note to maturity and the Treasury pays every coupon and the full principal. The return after tax and inflation is not guaranteed, and neither is the return of a Treasury fund, which can lose money in a year when yields rise.

Should I buy the ten-year Treasury or the ten-year TIPS?

On October 9 the nominal note yielded 5.24% and the TIPS 2.91% plus CPI inflation. The nominal note comes out ahead if inflation averages less than the 2.33% breakeven; the TIPS wins if inflation runs higher. For spending that must keep up with prices, the TIPS removes the guess. In a taxable account both are taxed federally on their full nominal return, including the TIPS inflation adjustment in the year it accrues.

Will bond prices rise if the Fed cuts rates?

Only if long yields fall by more than the market already expects. The ten-year yield reflects the expected path of short rates plus a term premium, so a cut that was already priced in may not move it. An individual note held to maturity pays the same either way.

Is 5% high for the ten-year Treasury?

It is the highest since 2007. Over a longer span it is ordinary: the year-end ten-year yield was above 5% at the end of every year from 1967 through 1997. Its real yield is the more unusual number. The ten-year TIPS yield of 2.91% is above where it closed on more than 99% of trading days since 2003, by the count in our real-yield guide.

Are Treasuries better than CDs in a high-tax state?

Often. Treasury interest is exempt from state and local income tax, and CD interest is not. With a 35.8% federal rate and a 5% state rate, a CD must pay about 5.68% to match a 5.24% Treasury after tax. The calculator above computes this for your rates.

Related guides

The Ten-Year Rose 392 Basis Points Since 2021. The Real Yield Rose 395.: how much of the ten-year’s rise is real yield, and what that does to the hurdle for stocks.
Will Government Bonds Blow Up?: what the 2026 sell-off means for a bond fund.
The Treasury Bond Fantasy: why living on Treasury coupons alone falls short after tax and inflation.
Stocks Usually Win. “Usually” Is Not a Financial Plan.: the long stretches when bonds beat stocks.
Is Locking In Today’s TIPS Yields Market Timing?: what a high real yield buys a retiree.
The Risk-Free Rate Is Your Hurdle Rate: matching the safe yield to your horizon before judging a risky asset.

Sources

US Department of the Treasury, Daily Treasury Par Yield Curve Rates; September 15 to October 9, 2026. home.treasury.gov
Board of Governors of the Federal Reserve System, Market Yield on U.S. Treasury Securities at 10-Year Constant Maturity (DGS10), via FRED. Source of the daily closes at or above 5% since 2000 and the 4.98% close on October 19, 2023. fred.stlouisfed.org
iShares 7-10 Year Treasury Bond ETF (IEF), fund page: effective duration 6.85 years and 30-day SEC yield 5.03% as of October 8, 2026. ishares.com
Martin L. Leibowitz, Anthony Bova and Stanley Kogelman, “Long-Term Bond Returns under Duration Targeting,” Financial Analysts Journal 70(1): 31–51 (2014). doi.org
TreasuryDirect, Treasury Notes: “Federal tax due each year on interest earned. No state or local taxes.” treasurydirect.gov
Internal Revenue Service, Net Investment Income Tax: 3.8% on net investment income, including interest, above modified AGI of $200,000 (single) or $250,000 (married filing jointly). irs.gov
Federal Reserve Bank of St. Louis, 10-Year Breakeven Inflation Rate (T10YIE), 2.33% on October 9, 2026. Breakevens include inflation risk and liquidity premiums, so they are not a pure forecast. fred.stlouisfed.org
US Bureau of Labor Statistics, CPI for All Urban Consumers, not seasonally adjusted (CUUR0000SA0). August 2026 index 334.980 against 323.976 a year earlier; the 3.40% change is computed from the index. bls.gov
Aswath Damodaran, “Historical Returns on Stocks, Bonds and Bills: 1928–2025,” histretSP.xls (January 2026 release): year-end ten-year Treasury yields, S&P 500 total returns, three-month T-bill returns and CPI inflation. The held-to-maturity note returns, ten-year windows and correlations are Summitward calculations from this file. pages.stern.nyu.edu
Elroy Dimson, Paul Marsh and Mike Staunton, UBS Global Investment Returns Yearbook 2026, summary edition: US real returns 1900–2025 of 6.6% for equities, 1.6% for bonds and 0.5% for bills; real returns in high-inflation, low-growth years of −4.7% for equities and −8.6% for bonds. ubs.com
US Department of the Treasury, Daily Treasury Par Real Yield Curve Rates; October 9, 2026. home.treasury.gov
TreasuryDirect, Treasury Inflation-Protected Securities (TIPS): principal adjusts with the CPI, and at maturity you receive the adjusted or original principal, whichever is greater. treasurydirect.gov
Aswath Damodaran, NYU Stern, implied equity risk premium: 4.14% on a 4.75% Treasury rate (September 1, 2026) and 4.20% on a 5.29% rate (October 1, 2026), trailing-twelve-month measure with adjusted payout; 3.30% on normalized earnings in October. Average implied premium 1960–2025 of 4.25% from histimpl.xls. pages.stern.nyu.edu
Amit Goyal, Ivo Welch and Athanasse Zafirov, “A Comprehensive 2022 Look at the Empirical Performance of Equity Premium Prediction,” Review of Financial Studies 37(11): 3490–3557 (2024). Sections 3.1.13, 3.4 and 5. doi.org
FactSet, Earnings Insight, October 9, 2026: S&P 500 forward 12-month P/E of 19.1. factset.com
Internal Revenue Service, Topic No. 409, Capital Gains and Losses. irs.gov
iShares 20+ Year Treasury Bond ETF (TLT), fund page: effective duration 14.68 years as of October 8, 2026. ishares.com

Author disclosure

Educational content, not investment or tax advice. I hold stocks, Treasuries and TIPS in my own accounts. The historical windows are Summitward calculations from a published dataset under the stated method; a different reinvestment assumption or start month moves the numbers slightly. Yields change daily.