A retiree parking cash in a savings account at one of the biggest national banks is likely earning almost nothing, often a fraction of a percent, while short-term Treasury bills issued by the federal government pay in the neighborhood of 3.8 to 3.9 percent. On top of that yield gap, the interest a Treasury bill pays is exempt from state and local income tax, an advantage no bank account can offer. For an older saver holding a cushion of cash, the difference between the two can add up to hundreds of dollars a year on the same money, with no added credit risk.
How Treasury Bills Beat a Big-Bank Savings Account
Treasury bills are short-term government debt sold at a discount and redeemed at full face value, with the difference serving as the interest. They come in terms from four weeks to a year, and because they are backed by the full faith and credit of the United States, they are considered among the safest places to hold cash. A saver who holds a bill to maturity knows the exact return at the moment of purchase.
The rate gap is the headline. As of mid-August, four-week bills yielded about 3.79 percent and thirteen-week bills about 3.87 percent on an annualized basis, according to the Treasury’s daily bill rate data. By contrast, the standard savings accounts at the largest brick-and-mortar banks routinely pay between 0.01 and 0.40 percent, and national average deposit rates published by the Federal Deposit Insurance Corporation sit far below the top of the market. Against those big-bank rates, a Treasury bill wins by a wide margin.
The comparison narrows against online high-yield savings accounts, some of which currently pay around 4 percent and edge out short bills on the raw rate. But those accounts are the exception rather than what most older savers actually hold, and their interest, unlike a Treasury bill’s, is fully taxable at the state level. For someone whose cash sits at a traditional bank, the switch to bills is the clearer win.
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The State-Tax Exemption That a Savings Account Cannot Match
The tax treatment is where Treasury bills pull decisively ahead for many retirees. Interest on federal debt is exempt from state and local income taxes under longstanding federal law, codified at Section 3124 of Title 31 of the U.S. Code, so a resident of a state with an income tax keeps more of the yield than the headline rate suggests. Interest from a bank savings account, by contrast, is taxed at every level, federal, state, and local.
That exemption raises the effective, after-tax return on a bill relative to a bank account paying the same nominal rate. A retiree in a state with a meaningful income tax could find that a Treasury bill yielding slightly less on paper than an online savings account still delivers more spendable interest once the state tax on the bank account is subtracted. The benefit is largest for savers in high-tax states and disappears only for those in states with no income tax, where the advantage over bills narrows to the yield alone.
Treasury interest does remain fully subject to federal income tax, so the exemption is a partial break rather than a full one. For a retiree already managing taxable income around thresholds that affect Medicare premiums or the taxation of Social Security, the state-level savings still helps without adding to the federal bill in a way a bank account would not.
Buying, Laddering, and the Catch for Retirees
Individuals can buy bills directly from the government at TreasuryDirect in increments as small as 100 dollars, or through a brokerage account, choosing among the four-, eight-, thirteen-, seventeen-, twenty-six-, and fifty-two-week terms described on the Treasury’s Treasury bills information page. Held to maturity, a bill carries no interest-rate risk, because the return is fixed at purchase regardless of what rates do afterward.
The practical drawback is access to the money. Cash committed to a bill is tied up until the term ends, so a retiree who might need it sooner should match the term to the timeline or use a ladder, buying bills that mature at staggered intervals so a portion comes due regularly and can be spent or reinvested. That structure keeps some cash always within reach while the rest continues earning the higher yield.
Selling a bill before maturity is possible on the secondary market but exposes the seller to price swings, undercutting the certainty that makes bills attractive in the first place. For that reason, the tool fits money a retiree can commit for a set stretch, not the emergency fund that has to be available on a moment’s notice.
For a saver whose cash is sitting in a big-bank account earning almost nothing, moving even part of it into short Treasury bills can meaningfully raise the return while keeping the money about as safe as it can be. The state-tax exemption sweetens the result in most of the country, and the government’s own platform makes the purchase straightforward.
The unresolved piece is where rates go next. If short-term yields drift lower, the gap over a bank account shrinks, and if they hold or rise, bills keep their edge. Either way, the decision for a retiree comes down to how much cash can be set aside for a fixed term in exchange for a yield that a traditional savings account has not come close to matching.
This article was produced with AI assistance and reviewed against primary sources by The Money Overview editorial team.
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