Treasury yields near 5% mean three things for your money: cash and short bills now pay a real income, new borrowing costs much more than it did in August, and anyone reaching for extra yield in long bonds or high-dividend stocks is taking price risk that the headline yield does not show. At the October 15, 2026 close, the 3-month Treasury bill yielded 4.28%, the 2-year 4.77%, the 10-year 5.10% and the 30-year 5.43%, according to Financial Modeling Prep market data. The average 30-year mortgage rate was 7.40% the same week. This follow-up to our seven-number look at the US economy works through what those yields do to a saver, a retiree and a borrower, with the arithmetic shown.

The yield curve on October 15, and a week earlier

All figures are from Financial Modeling Prep market data for the dates shown. The week-earlier column matters as much as the latest one, because it shows how fast these numbers move.

Two readings follow. First, the curve slopes upward: the 10-year pays 0.82 points more than the 3-month bill (5.10 minus 4.28). Second, long yields fell sharply in eight days while short yields barely moved. Anyone who assumed "5% is the new floor" on October 7 has already seen that it is not a floor. It is a price, and it changes daily.

For savers: what $100,000 in Treasury bills earns

Suppose you put $100,000 into 3-month bills and the yield stayed at the October 15 level of 4.28% for a full year. The income would be $100,000 x 0.0428 = $4,280 before tax. Two details change that number in practice.

• Taxes. Treasury bill interest is subject to federal income tax but, as TreasuryDirect states, there are no state or local taxes on it. At an illustrative combined federal rate of 24%, the $4,280 becomes $4,280 x 0.76 = $3,252.80 after tax. Your own rate will differ.
• Rollover. TreasuryDirect sells bills with terms from four to 52 weeks. A 3-month bill has to be rolled over about four times in a year, and each rollover happens at whatever the rate is that day. The $4,280 is an estimate under a stated assumption, not a promise.

Whether that income beats inflation is a separate question. The consumer price index rose 0.65% in September alone (336.298 against 334.131 in August, per Financial Modeling Prep market data). If that monthly pace persisted, it would compound to about 8% a year and swamp a 4.28% bill. One month is not a trend, which is why the next CPI release matters to savers as much as to the Fed. Our sibling piece, a five-number stagflation test, scores that risk.

For borrowers: the mortgage payment, worked out

The standard fixed-rate payment formula is:

Monthly payment = P x r / (1 - (1 + r)^-n), where P is the loan amount, r is the annual rate divided by 12, and n is the number of monthly payments (360 for 30 years).

Take a $400,000 loan. According to Financial Modeling Prep market data, the average 30-year fixed rate was 6.66% in the week of August 27, 2026 and 7.40% in the week of October 15, 2026, a rise of 0.74 points in seven weeks.

The difference is $199.01 a month, $2,388 a year, and about $71,644 over the life of the loan, for the same house and the same loan size. Another way to see it: at 7.40%, the first month's interest alone is $400,000 x 0.074 / 12 = $2,466.67, meaning roughly 89% of the first payment goes to the lender rather than to the principal.

Notice also what did not happen. The 10-year Treasury fell from 5.28% to 5.10% between October 7 and October 15, yet the weekly mortgage average was 7.40% on both October 8 and October 15. Mortgage rates follow long Treasury yields over time, not day by day. A borrower waiting for one good day in the bond market to show up in a quote may wait longer than expected.

For retirees and income investors: dividends against a 5.10% Treasury

Higher Treasury yields raise the bar for every income investment, a theme we covered in why higher Treasury yields are pressuring Dividend Aristocrats. Here are four household-products payers, using each company's latest quarterly dividend times four, divided by the October 15 closing price (Financial Modeling Prep market data).

Only Clorox out-yields the 10-year, and the reason is not comforting. Its price of $86.20 is 33.1% below its 52-week high of $128.90, and its trailing payout ratio is about 103% of earnings, according to the same data. We examined that in our Clorox dividend analysis. Kimberly-Clark pays out about 86% of earnings. A Treasury coupon is fixed for the life of the bond; a dividend is set by a board each quarter. A retiree comparing the two is comparing a contractual payment with a discretionary one.

Price risk, illustrated with bond arithmetic

The figures below are illustrative: a $1,000 bond with semiannual coupons, priced by discounting each coupon and the final $1,000 at the new yield. They show what a one-point move in yields does to the price of a bond bought at today's levels.

• 10-year bond, 5.10% coupon: if yields rise to 6.10%, the price falls to about $925.96 (-7.4%). If they fall to 4.10%, it rises to about $1,081.36 (+8.1%).
• 30-year bond, 5.43% coupon: if yields rise to 6.43%, the price falls to about $867.77 (-13.2%). If they fall to 4.43%, it rises to about $1,165.10 (+16.5%).
• The real week just past: a 10-year bond bought at par with a 5.28% coupon on October 7 would be worth about $1,013.96 at a 5.10% yield, a gain of about 1.4% (ignoring the few days of elapsed time and accrued interest).

The 30-year pays 0.33 points more than the 10-year, yet a one-point rise in yields would cost almost twice as much in price. That trade-off is the whole story of long bonds. Held to maturity, a Treasury returns its face value; sold early, it returns whatever the market pays that day.

A common mistake: reaching for the highest number

The tempting move in a 5% world is to buy whatever shows the biggest yield: the 30-year at 5.43%, or a stock at 5.80%. Both carry price risk the yield does not show. The extra 0.33 points on the 30-year over the 10-year is about $33 a year on a $10,000 position, while the illustrative one-point rise above would cost about $1,322 on that position. The extra 0.70 points on Clorox over the 10-year arrived with a 33% fall from the high. Yield is what you are paid to hold an asset. It says nothing about what the asset will be worth when you need to sell it.

A checklist before acting on 5% yields

1. Match the maturity to when you need the money. Money needed within a year belongs in bills, not in a 30-year bond.
2. Calculate after-tax income, remembering that Treasury interest is free of state and local tax.
3. For any dividend stock compared with a Treasury, check the payout ratio and the distance from the 52-week high.
4. For a mortgage, run the formula above at today's rate, not the rate you hope for.
5. Watch the next inflation print: the real return on any yield depends on it.

We cover each of these numbers as it moves in the Economy section and the Markets section, with the day's full coverage on the Wall Street Conservative front page. For the inflation report behind the rate move, see our September CPI coverage.

FAQ

How much does $100,000 earn in Treasury bills right now?

At the October 15, 2026 3-month yield of 4.28%, about $4,280 over a year before tax, if rates held steady through each rollover. That interest is federally taxable but free of state and local tax.

Why are mortgage rates so much higher than the 10-year Treasury?

Lenders price mortgages above Treasuries to cover credit risk, servicing and the borrower's option to refinance. On October 15 the gap was 7.40% against 5.10%, or 2.30 points.

Is a 5% Treasury safer than a 5% dividend stock?

The coupon is contractual and backed by the US government, while a dividend can be cut. But a long Treasury's market price can fall sharply if yields rise, so "safer" depends on holding it to maturity.

Will yields stay above 5%?

Nobody knows. The 10-year fell 0.18 points in the week to October 15. Plan for both directions rather than betting on one.