Treasury bills work inside an IRA much as they do anywhere else: you buy them at a discount, they mature at face value, and the account collects the difference. What changes is where you can buy them, how the interest is taxed and which of their usual advantages still matter. This guide covers buying bills in traditional and Roth IRAs, why the state tax break largely disappears inside the account, how bills can line up with retirement withdrawals and required minimum distributions, and the risks. The rest of our Treasury coverage is on the US Treasuries hub.
Can you hold T-bills in an IRA?
Yes, at a brokerage or bank that offers IRAs and sells Treasuries, but not at TreasuryDirect, which has no IRA account type. TreasuryDirect accounts can be registered to an individual, alone, with a secondary owner or with a beneficiary, or to an entity such as a corporation, an estate, a partnership or a trust. None of those registrations is an IRA, so Treasuries held in an IRA sit with the IRA's custodian.
Inside the IRA, there are three ways to own bills:
- New issues at auction. Many brokers let you place a noncompetitive bid for bills in the IRA, which gets the auction rate, the same as TreasuryDirect.
- Bills already trading. You can buy a bill with almost any remaining term from the secondary market, at the broker's ask price.
- Funds. A T-bill ETF or Treasury money market fund holds bills for you; the trade-offs against owning bills directly are covered in T-bill ETFs vs buying T-bills.
Not every custodian sells individual Treasuries, and some set their own minimums or fees, so check before opening or moving an account. Workplace plans such as 401(k)s are different again: whether you can hold individual bills depends on the plan's menu, and many offer only funds.
How do you buy T-bills in a traditional or Roth IRA?
You put cash into the IRA first, then use it to buy bills inside the account, because IRA contributions must be made in money rather than securities. IRS Publication 590-A says contributions must be cash, check or money order and property cannot be contributed, with rollovers as the exception. Bills you already hold at TreasuryDirect or in a taxable account cannot be moved in as a contribution; you would let them mature or sell them and contribute the cash.
The annual limit applies across all your traditional and Roth IRAs combined: for 2026 it is $7,500, plus a $1,100 catch-up at age 50 or older. You can make 2026 contributions until the tax filing deadline in April 2027, not counting extensions. Which account type suits you is a separate question, covered in Roth vs traditional IRA, and the limits for workplace plans are in IRA and 401(k) contribution limits.
Fund the IRA
Contribute cash up to the annual limit, or move money from another IRA by a direct trustee-to-trustee transfer, which avoids the once-a-year limit on indirect rollovers.
Pick the term
Match the bill's maturity to when the account will need cash, whether for a withdrawal, an RMD or a planned switch into other investments.
Place the order inside the IRA
Bid at the next auction or buy a bill from the secondary market, making sure the order is placed in the IRA and not in a taxable account.
Decide what happens at maturity
Turn on auto-roll if your broker offers it, or let the cash return to the IRA's sweep position. Either way, the money stays inside the IRA.
Worked example: Investing a $7,500 contribution in 26-week bills
- Bills trade in $100 steps, so $7,500 buys $7,600 of face value at a 4.11% discount rate, the 26-week rate Treasury reported on October 30, 2026.
- The price is $7,600 × 0.97922167 = $7,442.08, leaving $57.92 in the IRA's cash position.
- At maturity, 182 days later, the IRA receives $7,600, or $157.92 more than it paid, with no tax due that year.
- Someone 50 or older who adds the $1,100 catch-up could buy $8,700 of face value for $8,519.23.
Why doesn't the state tax break help inside an IRA?
Because nothing inside an IRA is taxed as it is earned, and when money comes out, many states tax the withdrawal without regard to what produced it. In a taxable account, T-bill interest escapes state income tax under federal law, which is a large part of the case for bills in high-tax states; the full rules are on are T-bills taxable. Inside a traditional IRA, the bill interest simply adds to the balance, and withdrawals are later taxed as ordinary income at the federal level whether the account held bills, stocks or CDs.
States differ on whether any Treasury character survives the trip through an IRA:
- New York says an IRA distribution loses the character of the income that produced it, so the subtraction for US obligation interest does not apply, according to a 1984 advisory opinion.
- Massachusetts taxes IRA distributions that came from federal obligation interest like any other IRA distribution.
- Virginia allows a subtraction for the part of an IRA distribution attributable to US obligation interest, if you can document it, according to a 2018 ruling.
- Oregon has a subtraction code for US government interest included in IRA or Keogh distributions.
Documenting that share years later is hard, since an IRA usually holds many investments over time. For a Roth IRA the question rarely matters: qualified withdrawals are tax-free at the federal level, and states generally follow that treatment.
| Question | Taxable account or TreasuryDirect | Traditional IRA | Roth IRA |
|---|---|---|---|
| When federal tax applies | Each year a bill matures or is sold | On withdrawal, as ordinary income | Not on qualified withdrawals |
| State income tax on the bill interest | Exempt | Many states tax withdrawals in full | Generally not on qualified withdrawals |
| Tax form | Form 1099-INT, box 3 | Form 1099-R on withdrawal | Form 1099-R on withdrawal |
| Available at TreasuryDirect | Yes | No | No |
The practical upshot is that inside an IRA, bills compete with CDs, money market funds and other cash holdings on pre-tax yield alone. In a taxable account the comparison should use after-tax yields, which is where bills' state exemption counts.
How do T-bills compare with other cash options in an IRA?
Inside an IRA, bills compete with sweeps, money market funds, T-bill ETFs and brokered CDs on pre-tax yield, access and convenience alone. Each one sets its yield and returns your money differently.
| Option | How the yield is set | Access to the money | What to watch |
|---|---|---|---|
| Individual T-bills | Fixed at purchase until maturity | At maturity, or by selling at the bid | Rolling each maturity; broker minimums |
| Core cash or sweep | Set by the broker or bank and can change any day | Immediate | The rate can sit well below bill yields |
| Treasury money market fund | Moves daily with short-term rates | Usually the same or next business day | Fund expenses; the yield changes daily |
| T-bill ETF | Moves with the bills the fund holds | Trades during market hours and settles the next business day | Expense ratio and small price moves |
| Brokered CD | Fixed until maturity | At maturity, or by selling at a market price | FDIC limits per bank; an early sale can fetch less than face value |
Which fits depends on when the money is needed and how much attention you want to give it. Individual bills lock in a rate for a known period with no fund expenses, while funds and sweeps trade some yield or price stability for daily access without any rolling. The detailed comparisons are in T-bills vs money market funds, brokered CDs explained and cash sweep accounts explained.
Account type matters as well. Because qualified Roth growth is never taxed, a Roth's advantage is worth more on holdings expected to grow faster, and a dollar of Roth space spent on low-yielding bills shelters less growth than it could. How to divide holdings across taxable, traditional and Roth accounts depends on your whole plan, which makes it a good question for a financial planner or tax professional.
Where do T-bills fit in retirement cash?
Bills suit money a retirement account will need within a year or two, such as planned withdrawals and required minimum distributions, rather than money meant to grow for decades. Their prices barely move, they mature on a known date and they are backed by the full faith and credit of the US government, which makes them a common choice for the cash portion of a retirement portfolio. The broader menu of low-risk options for retirees is covered in safe investments for retirees.
Required minimum distributions make timing concrete. Owners of traditional IRAs must start taking RMDs at age 73, or 75 for anyone born in 1960 or later: the first is due by April 1 of the year after you reach that age, and each later one by December 31. The amount is the prior year-end balance divided by a life-expectancy factor from the IRS Uniform Lifetime Table. Roth IRA owners have no RMDs during their lifetime.
Worked example: Lining up bills with a $15,686 RMD
- At the end of the prior year, a 74-year-old has $400,000 in a traditional IRA. The Uniform Lifetime Table factor at 74 is 25.5, so the RMD is $400,000 ÷ 25.5 = $15,686.27.
- About six months before the December 31 deadline, the IRA buys $16,000 of face value in 26-week bills. At a 4.11% discount rate, that costs $15,667.55.
- The bills mature in December at $16,000. The IRA pays out the $15,686.27 RMD and keeps the remaining $313.73 in cash.
- The withdrawal is taxed as ordinary income at the federal level and, in many states, at the state level too, even though the bills were Treasuries.
Some retirees extend the same idea into a ladder of bills that mature before each quarterly or annual withdrawal; how to build one is covered in how to build a T-bill ladder. A money market fund inside the IRA does a similar job with daily access but no fixed maturity, as how money market funds work explains. To price bills for any withdrawal date, use the Treasury bill calculator.
What are the risks of holding T-bills in an IRA?
Bills in an IRA carry the usual Treasury risks, mainly reinvestment and inflation risk, plus the rules that govern retirement accounts. The general case is covered in are Treasuries risk-free.
- Reinvestment risk. Bills are short, so each maturity is reinvested at the going rate. With the federal funds target at 3.75% to 4.00%, any cuts would flow through to the account's cash yield within weeks.
- Inflation risk. Consumer prices rose 3.7% in the 12 months to September 2026, according to the Bureau of Labor Statistics, close to bill yields of about 4% to 4.4%. In a traditional IRA, the tax due on withdrawal shrinks that real return further.
- Opportunity cost. Money that will not be needed for many years may have other jobs in a retirement plan; bills are a cash tool, not a growth one.
- Early withdrawal tax. Taking money out of a traditional IRA before age 59½ generally adds a 10% additional tax on top of income tax, unless an exception applies.
- RMD penalties. Missing an RMD can trigger a 25% excise tax on the shortfall, reduced to 10% if corrected within two years.
- Rollover limits. Only one indirect IRA-to-IRA rollover is allowed in any 12-month period across all your IRAs, which is why direct trustee-to-trustee transfers are the usual way to move an account.
- Custodian risk. If the brokerage fails, SIPC protects customer securities and cash up to $500,000 per customer, including up to $250,000 in cash; the bills themselves remain obligations of the US government. FDIC vs SIPC explains the difference.
Tax rules for retirement accounts change and depend on your situation, so check the details with a tax professional before acting. For other topics, start from the Learn home page.