SGOV vs. HYSA: Is a Treasury ETF Better Than a High-Yield Savings Account?

Yields move daily. SGOV’s figure is its published 30-day SEC yield for September 3, 2026, and the calculator below refreshes it from a daily Treasury-backed feed. Bank rates have no licensed feed, so you type your own. The government-obligation percentage is for tax year 2025 and is republished every January.

The short version

A savings account pays interest that is taxed by your state; SGOV pays interest that mostly is not. On September 3, 2026 SGOV yielded 3.63%, and 95.14% of its 2025 income came from Treasury obligations, which states do not tax. For one modeled California saver at a 32% federal and 9.3% state rate, a bank would need to pay about 4.18% APY to match that after tax. In a state with no income tax the bank only needs to match 3.63%. The bank keeps two things SGOV cannot offer: FDIC insurance and same-day access without a trade. Whether those are worth the gap depends on your balance, and below roughly $20,000 the gap is under $100 a year at the modeled rates.

Both of these are places to keep cash you do not want in the market. The comparison gets muddled because they are safe in different ways, accessible in different ways, and taxed in different ways, and most write-ups pick one axis. This one works through all three and then puts a number on it: the APY a bank would need to pay to match SGOV after tax.

What each one is

A high-yield savings account is a bank deposit. The bank owes you the balance, the FDIC insures it up to $250,000 per depositor, per insured bank, per ownership category, and the interest is ordinary income at both federal and state level.⁴

SGOV is an exchange-traded fund holding Treasury bills that mature within three months. It held about $107.5 billion in September 2026, charges 0.09%, and distributes its interest monthly.¹ The share price barely moves, because the bills are so short that there is almost no interest-rate risk to express. You buy and sell it in a brokerage account like any other ETF.

What the guarantee covers

The safety of a savings account comes from insurance: if the bank fails, the FDIC makes you whole up to the limit.⁴ The safety of SGOV comes from what it holds. Treasury bills are obligations of the US government, and a fund that owns nothing else is as safe as those bills. There is no insurance layer because there is nothing for one to cover.

SIPC is the part people confuse. It protects the cash and securities in a brokerage account if the broker itself fails, up to $500,000 including $250,000 of cash. It does not protect against a fund losing value, and it is not a substitute for FDIC insurance on a deposit.⁵ For SGOV the distinction rarely bites, since the fund’s value rests on the bills rather than on the broker, but it is the correct way to describe what each guarantee does.

Getting the money out

A savings account at the same bank as your checking account moves money instantly. One at a different bank takes an ACH transfer, usually one to three business days. SGOV takes a sale, which settles the next business day under the T+1 standard in force since May 2024, and then a transfer out of the brokerage if the bill is paid from a bank.⁶

In practice the gap is a day or two, and it only matters for cash you might need tomorrow. That is the layer of cash a savings account is for. The rest, the balance that sits for months, does not care about a settlement day.

The tax gap and the APY a bank would need

Interest on Treasury obligations is exempt from state income tax. Each January iShares publishes what share of the prior year’s SGOV income qualified; for 2025 it was 95.14%.² A bank’s interest gets no such treatment. So in any state with an income tax, the same headline yield is worth more from SGOV than from a bank.

The useful way to express that is the APY a bank would have to pay to come out even after tax. For one modeled California saver at a 32% federal and 9.3% state rate, SGOV’s 3.63% is worth about 2.45% after tax, and a bank would need to pay roughly 4.18% to match it. In a state with no income tax, the exemption is worth nothing and the bank needs only to match 3.63%. Everything in between scales with your state rate.

California, Connecticut and New York add one condition: a fund must have held at least half its assets in government obligations at the end of every quarter before any of its income is exempt.³ SGOV clears that easily. Some money market funds do not, which is the subject of the SPAXX comparison.

Run your own numbers

Enter your balance, state and the APY your bank pays. It reports the rate a bank would need to match SGOV at your tax rates, which is the number to remember when a bank advertises a new rate.

Moving cash that is already somewhere

Moving from a savings account into SGOV has no tax cost at all: cash has no gain to realize. Moving the other way is close to free too, because a bill fund distributes its interest monthly and the share price rarely sits more than about a month of interest above what you paid. The same point, worked through for switching between two bill funds, is in the SGOV vs. VBIL guide. This is the opposite of switching between stock funds, where an embedded gain can lock you in for years.

When a savings account is the right answer

Below a modest balance the after-tax gap is a few dollars a month and is not worth a brokerage login. At the modeled California rates the gap clears $100 a year at about $22,000; in a no-tax state it takes closer to $64,000 against a 3.40% bank. Under those levels, pick whichever is already set up.

Cash you might need the same day belongs in the bank regardless of yield. So does cash held by someone who wants the FDIC guarantee and does not want to think about a fund, which is a reasonable preference and costs little at small balances. And in a state with no income tax, a bank that pays close to SGOV’s yield has closed most of the gap on its own.

Key takeaways

The tax treatment is the difference. SGOV yielded 3.63% on September 3, 2026 with 95.14% of 2025 income exempt from state tax; a bank’s interest is fully taxable.
Think in the APY a bank would need. For one modeled California saver at 32% federal and 9.3% state, about 4.18%. In a no-tax state, 3.63%.
The guarantees are different in kind. FDIC insures the bank; SGOV’s safety is the Treasury bills it holds; SIPC covers a broker failure, never a fund’s value.
Access differs by about a day. SGOV settles T+1 and then transfers; a bank moves instantly or by ACH.
Switching is nearly free in both directions. Cash has no gain, and a bill fund carries almost none.

How Summitward helps

Cash tracker

See what every dollar of your cash yields after your own federal and state rates, with daily Treasury-backed yields for SGOV and its peers.

Open the cash tracker

Frequently asked questions

Is SGOV better than a high-yield savings account?

After tax, usually, in any state with an income tax and at any balance large enough for the gap to matter. For one modeled California saver a bank needs about 4.18% APY to match SGOV’s 3.63%. The bank wins on FDIC insurance, same-day access and simplicity, and at small balances those are worth more than the gap.

Is SGOV FDIC insured?

No. FDIC insurance covers bank deposits. SGOV is a fund holding Treasury bills, and its safety comes from the bills. The brokerage account it sits in is covered by SIPC against the broker failing, which is a different protection.

How fast can I get money out of SGOV?

Sell during market hours and the sale settles the next business day. If the money then has to move to a bank, add an ACH transfer. Plan on two to three business days end to end, against same day for a savings account at your own bank.

Do I pay state tax on SGOV?

On a small part. For 2025 iShares reported 95.14% of SGOV’s income as Treasury interest, which states do not tax; the remaining 4.86% is taxable. The exemption applies in full in California, Connecticut and New York because SGOV meets their quarterly holdings test.

At what balance does SGOV start to matter?

When the after-tax gap covers the bother. At the modeled California rates that is roughly $22,000 for $100 a year; in a state with no income tax it is closer to $64,000 against a 3.40% bank. Below that, use whichever account already exists.

Related guides

SGOV vs. T-Bills vs. HYSA at a glance: the compact table, with direct T-bills added.
Where to Park Your Cash: sizing the layers, plus the muni option for high earners.
SPAXX vs. HYSA: the same question for cash sitting in a Fidelity core position.
SGOV vs. VBIL: choosing between the two bill funds once you have decided on one.
SGOV vs. USFR: bills against floating rate notes.

Sources

iShares, “iShares 0-3 Month Treasury Bond ETF (SGOV),” fund page read September 7, 2026 (expense ratio 0.09%; net assets $107.5 billion as of September 4, 2026; 30-day SEC yield 3.63% as of September 3, 2026). ishares.com
BlackRock, “2025 U.S. Government Source Income Information,” iShares (SGOV 95.14%, marked as meeting the quarterly threshold). ishares.com (PDF)
Vanguard, “U.S. government obligations income information,” tax year 2025 (statement of the California, Connecticut and New York requirement that 50% of assets be in US government obligations at each quarter end). investor.vanguard.com
FDIC, “Deposit Insurance” (coverage of $250,000 per depositor, per insured bank, per ownership category). fdic.gov
SIPC, “What SIPC Protects” (protection against a broker’s failure up to $500,000 including $250,000 of cash; no protection against a decline in value). sipc.org
SEC, T+1 settlement for most broker-dealer securities transactions, effective May 28, 2024. sec.gov

Author disclosure

I hold Treasury bill funds for cash and keep a savings account for the same-day layer. I have no relationship with iShares or any bank named here. SGOV’s figures are the issuer’s own on the date given; the bank rate in the calculator is a dated snapshot you are expected to replace with your own. Nothing here is tax advice.