The best savings interest rates for September 2026
The best verified savings rate we found is 4.21% APY, but it comes with qualification rules. Compare that headline rate with simpler savings and short-term Treasury options.
Dan Faber
September 3, 2026·6 min read·Cash, Rates
As of September 3, 2026, the best savings rate we could verify directly from a U.S. bank is 4.21% APY. That rate is not automatic: Axos ONE customers must meet monthly deposit and checking-balance requirements, and the boosted APY applies only to the first $249,999.99.
If you want fewer conditions, a slightly lower rate can be the better account. Axos Summit Savings was paying 3.75% APY with no minimum balance and no monthly maintenance fee. Short-term Treasury yields were also competitive, although Treasury securities are not bank savings accounts and their prices, access, and tax treatment work differently.
September savings rates at a glance
| Option | Rate | What to know |
|---|---|---|
| Axos ONE Savings | Up to 4.21% APY | Requires qualifying monthly deposits and a qualifying average daily checking balance |
| Axos Summit Savings | 3.75% APY | No minimum balance and no monthly maintenance fee |
| 4-week Treasury bill | 3.72% coupon equivalent | U.S. Treasury market rate on September 2; not a savings account |
| 26-week Treasury bill | 4.03% coupon equivalent | U.S. Treasury market rate on September 2; requires accepting a longer maturity |
Axos publishes the 4.21% qualification rules, balance tiers, and effective date on its official Axos ONE rate page.
The comparison rate for Treasury bills comes from the U.S. Treasury daily bill-rate table.
The highest APY is not automatically the best account
A headline APY matters only if your balance and normal banking activity qualify for it. Before moving cash, check the deposit requirement, minimum balance, rate cap, monthly fees, transfer limits, withdrawal access, and whether the institution is FDIC- or NCUA-insured.
"The best savings rate is the highest net yield you can reliably earn without weakening the job that cash needs to do."
Compare yield after taxes, access, and limits
Bank interest is generally taxable at the federal and state levels. The IRS explains that Treasury interest is subject to federal income tax but exempt from state and local income taxes. That can make a Treasury bill with a lower quoted yield competitive for someone in a state with income tax, but the result depends on the person, account type, and holding period.
- Keep bill-paying and emergency cash accessible enough for its purpose.
- Compare the APY that applies to your actual balance, not only the advertised maximum.
- Subtract fees and account for any activity needed to unlock a promotional rate.
- Check deposit-insurance coverage before concentrating a large cash balance at one institution.
- Recheck variable rates regularly because a September leader may not remain the leader.
The September takeaway
Use 4.21% APY as the September headline benchmark for a condition-heavy savings offer and roughly 3.75% as a cleaner no-minimum benchmark. A rate near those levels deserves a closer look; a much lower rate is a reason to compare alternatives, provided you preserve liquidity, insurance coverage, and a manageable account setup.
To see how much a rate gap matters across your own cash balances, review the cash tools in the Tablewealth calculator library. This article is general educational information, not individualized financial or tax advice.
