A T-bill ETF and a Treasury bill you buy yourself hold the same kind of asset, so the choice comes down to cost, tax and how you want to hold it. The ETF charges a small annual fee and trades on an exchange, which adds a spread; the bill has no fee but comes with a fixed maturity and some paperwork. Below we look at three ultra-short Treasury ETFs as examples, not recommendations, and add up what each would cost over a year on $50,000. The Treasuries hub collects the rest of our coverage of bills, notes and bonds.
What does a T-bill ETF cost to own?
Its main cost is the expense ratio, a yearly fee taken from the fund's income, and the three ultra-short Treasury ETFs we checked charge 0.06% to 0.1352%. We chose three whose issuers publish fee, spread and tax data. The table is a sample of the category, ordered by fee, and not a ranking.
| Fund (ticker) | Issuer | What it holds | Expense ratio | Where we checked |
|---|---|---|---|---|
| Vanguard 0-3 Month Treasury Bill ETF (VBIL) | Vanguard | Treasury bills maturing within three months | 0.06%, cut from 0.07% in February 2026 | SEC filing |
| iShares 0-3 Month Treasury Bond ETF (SGOV) | BlackRock (iShares) | Treasuries maturing within three months | 0.09% | ishares.com, October 30, 2026 |
| SPDR Bloomberg 1-3 Month T-Bill ETF (BIL) | State Street | Treasury bills maturing in one to three months | 0.1352% gross | ssga.com, October 29, 2026 |
The fee is deducted from the fund's income before it reaches you, so the yield an issuer quotes, such as the 30-day SEC yield, is already net of it. On $50,000 these fees come to $30, $45 and $67.60 a year. The SEC's bulletin on fund fees notes that a higher-cost fund must perform better than a cheaper one to give you the same return, and that the prospectus fee table leaves out trading costs such as commissions and premiums or discounts to net asset value. TreasuryDirect, by contrast, takes no commission or purchase fee on the bills it sells. Brokerages set their own policies on bill commissions and markups, and how to buy Treasury bills compares the routes. For a primer on the fund structure itself, see what an ETF is.
How closely does a T-bill ETF track its index?
Closely, though not exactly: a fund's return trails its index by roughly the expense ratio plus small trading and cash costs. The SPDR fund's published record shows the pattern over periods ending September 30, 2026.
| Period to September 30, 2026 | Fund NAV return | Index return | Shortfall |
|---|---|---|---|
| 1 year | 3.66% | 3.79% | 0.13 points |
| 3 years, annualized | 4.46% | 4.59% | 0.13 points |
| 5 years, annualized | 3.65% | 3.80% | 0.15 points |
| 10 years, annualized | 2.29% | 2.44% | 0.15 points |
The shortfall sits close to the fund's 0.1352% expense ratio, which is what you would expect from a fund that simply holds and rolls bills. On $50,000, the one-year gap is about $65. Past returns don't predict future ones, but the steadiness of the gap is the useful signal.
A bill you own has no tracking question: hold it to maturity and you earn exactly the yield you bought. What you give up is the averaging. An ETF holds many bills bought at different times, so its yield moves smoothly, while your own bills lock in whatever rate prevailed on the day you bought each one.
What do spreads and premiums add?
Each trade costs about half the bid-ask spread, and the price you pay can sit slightly above or below the fund's net asset value. The SEC's investor bulletin on ETFs explains both. The spread is the gap between the highest price a buyer will pay and the lowest a seller will accept, and a premium or discount is the gap between the market price and the value of the fund's holdings. Issuers publish both figures:
- iShares 0-3 Month Treasury Bond ETF: a 30-day median bid-ask spread of 0.01% and a premium/discount of −0.01% on October 30, 2026.
- SPDR Bloomberg 1-3 Month T-Bill ETF: a 30-day median bid-ask spread of 0.01% and a premium/discount of 0.00% on October 29, 2026. In 2025 it closed at a premium on 159 days and at a discount on 91.
At a 0.01% spread, buying and later selling $50,000 costs about $5 in total. That is small in calm markets, but it is not fixed. State Street's fund disclosures warn that ETF shares may trade at significant discounts to net asset value in periods of market stress, which is exactly when you might want to sell. A limit order sets the worst price you are willing to accept. ETF trades also settle like stock trades: One business day after the trade (T+1), since May 28, 2024.
Direct bills carry spreads too if you buy or sell them in the secondary market through a broker. Bought at auction and held to maturity, a bill involves no trade against a dealer at all. Our glossary covers the bid-ask spread and net asset value in more detail.
Do T-bill ETF dividends keep the state tax exemption?
Often in part and sometimes in full, depending on the share the fund reports as US government income and on whether your state lets it pass through. A bill held in your own name needs no pass-through: federal law keeps its interest free of state and local income tax, and it shows up in a separate box of Form 1099-INT. An ETF's payouts arrive as dividends on Form 1099-DIV, so the exemption depends on the fund passing it through and on your state honoring it.
Issuers post an annual figure for the portion of every fund's payouts earned on US government obligations, and Vanguard's 2025 figure for its 0-3 Month Treasury Bill ETF was 100%. Apply that portion to the box 1a total, and your state's instructions show where to subtract the result. Funds that hold only Treasuries tend to report figures at or near 100%, while funds that also use repurchase agreements report less, because states generally tax repo income.
California, Connecticut and New York add a hurdle: the fund must hold at least half its assets in US government obligations at the end of every quarter for any of its dividends to qualify, and California's Publication 1001 sets out that state's version of the rule. A pure Treasury ETF clears that easily, but check the issuer's tax page before you file, and ask a tax professional if the amounts are large. The rules for bills held in your own name are in are T-bills taxable, and T-bills vs money market funds shows how the same 50% test plays out for funds that hold repos.
How do ETF distributions differ from bill interest?
A T-bill ETF pays a monthly dividend that is taxable in the year you receive it, while a bill pays all its interest at maturity. The iShares fund, for example, distributes income monthly. Its payout with a November 2, 2026 ex-date was $0.328581 a share, and none of the 10 most recent distributions on its website included capital gains. Because the fund's income comes from interest, these dividends generally don't qualify for the lower tax rates on qualified dividends.
Between payouts, the fund's net asset value climbs as interest accrues and then drops by about the payout on the ex-dividend date. That sawtooth is why the iShares fund's NAV ranged only from $100.27 to $100.74 over the 52 weeks to October 30, 2026, even though it paid a trailing 12-month yield of 3.64%. It also sets a trap: if you sell at a small loss just after an ex-date and buy the same fund back within the wash-sale window, which runs 30 days before or after the sale (a 61-day window), the loss can be disallowed. See the wash-sale rule for how that works.
Bills follow a different calendar. Treasury's guidance is that bill interest is taxable in the year the bill matures, which might not be the year you bought it. A 26-week bill bought in November 2026 matures in May 2027, so all its interest falls into your 2027 tax year, whereas an ETF holding similar bills would also pay you a taxable dividend in December 2026. The bill's timing can help if you expect lower income next year, and it is a drawback if you want a steady monthly payout.
One year on $50,000: ETF or bills
Here is the full-year comparison, holding the yield fixed so that only the costs differ.
Worked example: $50,000 for one year in an ETF or in rolled 13-week bills
Both options are assumed to earn 4.08% before costs, which is where the 13-week bill's investment rate stood on October 30, 2026, with no change over the year. The bills are bought at auction through TreasuryDirect with no fee and rolled through four consecutive 13-week terms. Each ETF is bought once and sold once at a 0.01% spread, with no commission. Income is shown before tax and without compounding, so the only differences are costs.
| Option | Gross income | Expense ratio cost | Spread cost, in and out | Net income | Cost vs bills |
|---|---|---|---|---|---|
| 13-week bills, rolled | $2,040.00 | $0.00 | $0.00 | $2,040.00 | none |
| ETF at 0.06% | $2,040.00 | $30.00 | $5.00 | $2,005.00 | $35.00 |
| ETF at 0.09% | $2,040.00 | $45.00 | $5.00 | $1,990.00 | $50.00 |
| ETF at 0.1352% | $2,040.00 | $67.60 | $5.00 | $1,967.40 | $72.60 |
On these assumptions, holding bills through an ETF costs between $35 and $72.60 a year on $50,000, or roughly $3 to $6 a month. Buying bills in the secondary market through a broker, rather than at auction, would add a spread on the bill side too and narrow the gap.
Taxes can widen or narrow that gap. In a high-tax state, an ETF that reports less than 100% US government income, or fails a state's 50% test, would cost more than the table shows, while a pure Treasury ETF that passes the test keeps the bill's state tax advantage. To model other balances, the Treasury bill calculator prices individual bills and the compound interest calculator shows how reinvested dividends grow.
What are the risks of a T-bill ETF compared with owning bills?
The ETF adds market-price risk, small tracking gaps and fund-level rules on top of the interest-rate and reinvestment risks that bills already carry.
- No maturity date. A bill pays a known face value on a known day. An ETF never matures, so what you receive depends on its price when you sell.
- Discounts in stress. In calm markets these funds trade very close to NAV, but issuers warn that discounts can widen sharply in market turmoil.
- Fast pass-through of rate cuts. The iShares fund's effective duration was 0.11 years, so its yield follows bill rates down within weeks when rates fall. A bill holds its rate until maturity.
- Not FDIC-insured. Neither ETFs nor bills are bank deposits. At a brokerage, SIPC protects your holdings up to $500,000 per customer, including up to $250,000 in cash if the firm fails, but not against a fall in market value; FDIC vs SIPC explains the difference.
- Fund-level events. A fund can change its fee or index, or close and liquidate, which would return your cash and could trigger a taxable gain or loss.
- Risks the two share. Inflation can outpace both, and bills sold before maturity can fetch less than you paid if rates have jumped; are Treasuries risk-free covers those in detail.
When does the ETF's flexibility matter most?
An ETF suits money that may move at short notice, because you can sell any trading day without waiting for a maturity date. There is no TreasuryDirect-style holding period either: bills bought there must be held for 45 calendar days before they can move to a broker to be sold. You can buy any number of shares, or fractional shares at some brokers, set dividends to reinvest automatically and never schedule a rollover.
Bills held directly suit money with a date attached, such as a tax payment or tuition bill, because you can buy one that matures just before it and know the exact amount you will receive. They also make sense if you want to avoid fund fees entirely or keep bills in TreasuryDirect, outside the brokerage system. For the account side, see T-bills in an IRA.
For bank products, see how bills stack up in T-bills vs high-yield savings and T-bills vs CDs. The money market fund comparison linked above covers the other fund route, and where to park cash short term surveys the wider field.