Quick answer: A high-yield savings account (HYSA) pays roughly 3.5% to 4% APY in September 2026, tracking short-term rates — the federal funds target range is 3.50% to 3.75% and three- to six-month Treasury bills yield about 4% — against a small fraction of a percent at many large traditional banks. On $20,000 at 0.01% versus 3.80%, that is the difference between about $2 and about $760 a year, for the same FDIC insurance and the same instant access. The catch is almost never the rate itself; it is the fine print on minimum balances, transfer speed, and promotional rates that drop after a few months.
Why the gap is so large
Online banks have no branch network, so their cost of running an account is a fraction of a national bank’s. They pass part of that saving on as interest to attract deposits. Large traditional banks with millions of existing customers have little reason to compete on rate, because most people never move their savings.
The practical effect: leaving an emergency fund in a big-bank savings account costs real money every year, and moving it is mostly a short online application plus a few days for verification.
What you actually earn
| Balance | At 0.01% (big bank) | At an assumed 3.80% (HYSA, illustration only) | Difference per year |
|---|---|---|---|
| $5,000 | $0.50 | $190 | $189 |
| $10,000 | $1 | $380 | $379 |
| $20,000 | $2 | $760 | $758 |
| $50,000 | $5 | $1,900 | $1,895 |
| $100,000 | $10 | $3,800 | $3,790 |
These assume the rate holds for the year. HYSA rates are variable and move with the Fed, so treat them as current rather than guaranteed.
What to check beyond the headline rate
- Is the top rate promotional? Some accounts advertise a high APY for an introductory period, then drop to something ordinary. Look for the ongoing rate, not the intro rate.
- Minimum balance to earn the APY. A few accounts pay the headline rate only above a threshold, or only up to a cap, with the excess earning far less.
- Minimum to open, which is often $0 but can run to several hundred dollars or more depending on the bank.
- Monthly fees, which should be zero. If there is a maintenance fee, look elsewhere.
- Transfer speed. External ACH transfers can settle the same day or the next business day, though some banks still take two to three business days. If you need same-day access, keep a buffer in your checking account.
- Withdrawal limits. The old federal six-per-month rule was relaxed, but many banks still impose their own limit and charge for excess withdrawals.
- FDIC insurance, covering $250,000 per depositor per bank per ownership category. Check the bank is FDIC-insured, or NCUA-insured for a credit union.
- Whether it is a bank or a fintech app. Some apps hold your money at partner banks; the insurance passes through, but confirm which bank actually holds it.
HYSA vs the alternatives
| High-yield savings | Certificate of deposit (CD) | Money market account | Treasury bills | |
|---|---|---|---|---|
| Typical yield | 3.5%–4.5% | Similar or slightly higher | Similar to HYSA | Comparable, varies by term |
| Access to money | Anytime | Locked until maturity | Anytime | Sell early at market price |
| Rate certainty | Variable | Fixed for the term | Variable | Fixed at purchase |
| Insurance | FDIC/NCUA | FDIC/NCUA | FDIC/NCUA | Backed by the US Treasury |
| Check writing / debit | Rarely | No | Often yes | No |
| State income tax | Taxable | Taxable | Taxable | Exempt from state tax |
| Best for | Emergency fund | Money you will not need for a set period | Savings you occasionally spend from | Large balances in high-tax states |
For an emergency fund, the HYSA usually wins because access matters more than squeezing the last quarter point. For money with a known date, such as a house deposit 18 months away, a CD locks the rate and removes the risk of falling rates.
How to move your money
- Open the new account online; the application is short and needs your Social Security number and ID.
- Link your existing checking account and complete the micro-deposit verification, usually a day or two.
- Transfer your savings across, keeping about one month of expenses in checking for immediate needs.
- Do not close the old account immediately if direct debits point to it. Redirect those first.
- Set a calendar reminder for six months to re-check the rate, since the leaders change.
The tax point people miss
Interest is taxed as ordinary income at your federal rate, and by your state unless you live somewhere without income tax. The bank issues a 1099-INT if you earn $10 or more. Earning $800 in interest at a 24% federal rate leaves about $608, which is still vastly better than $2. If you are in a high-tax state and holding a large balance, Treasury bills are worth comparing because their interest is exempt from state tax.
Frequently asked questions
Are online banks safe?
If FDIC-insured, your deposits are protected to the same $250,000 limit as at any national bank. Check the FDIC BankFind tool if you are unsure about a name you do not recognise.
Will the rate drop?
Yes. HYSA rates are variable and generally fall after the Fed cuts, though how quickly each bank passes a cut through varies. That is the trade-off against a fixed-rate CD.
Can I have more than one?
Yes, and people with over $250,000 often split across banks to stay within insurance limits.
Does opening one affect my credit score?
Usually not. Banks typically check a deposit-account screening report such as ChexSystems or Early Warning Services, though some also use your traditional credit report.
Last updated September 2026. APYs are variable and change frequently; verify current rates and terms on the bank’s own site before opening. General information, not financial advice.
Sources
Rate context comes from the Federal Reserve’s H.15 Selected Interest Rates release. Deposit insurance limits are set by 12 U.S.C. 1821(a)(1)(E) at $250,000 per depositor, per insured bank, per ownership category. For current national deposit rates see the FDIC’s weekly National Rates and Rate Caps. On account screening see CFPB — Why was I denied a checking account? Rates in this article are illustrative and move constantly; check the current rate with the bank before opening an account. Note that a money market deposit account at a bank or credit union is insured, while a money market mutual fund is a security and is not.
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