On September 16, 2026, the Federal Reserve raised its benchmark rate by a quarter point, to 3.75%–4.00% — the first increase since 2023. For borrowers that was bad news. For savers it was the first good news in three years, and the online banks have been advertising it since: on September 29, Axos was showing 4.21% APY on its Axos ONE savings account, Wealthfront 3.55% as the base rate on its cash account, and Ally 3.10%. The FDIC's national average for a savings account, published the same week, was 0.37%.
So how much does a high-yield account actually pay on real balances — and how much of it do you keep? On $25,000, the gap between the national average and the best advertised rate is about $960 a year. That part is real. What most rate tables leave out is the second half: after federal income tax at 22% and inflation at 3.4%, even a 4.21% account loses a little purchasing power. This guide puts both halves in dollars, explains APR and APY without the jargon, and ends with the short list of things worth checking before you move your cash.
What $10k, $25k and $50k earnOne year, five accounts
Interest in a savings account is quoted as APY — annual percentage yield — which already includes compounding. That makes the first calculation simple: balance times APY, for one year, if the rate stays put.
Interest checking, national average 0.07%
- $10,000
- $7
- $25,000
- $18
- $50,000
- $35
Savings, national average 0.37%
- $10,000
- $37
- $25,000
- $93
- $50,000
- $185
12-month CD, national average 1.73%
- $10,000
- $173
- $25,000
- $433
- $50,000
- $865
Ally Online Savings, 3.10%
- $10,000
- $310
- $25,000
- $775
- $50,000
- $1,550
Wealthfront Cash, 3.55% base
- $10,000
- $355
- $25,000
- $887
- $50,000
- $1,775
Axos ONE Savings, 4.21% with conditions
- $10,000
- $421
- $25,000
- $1,053
- $50,000
- $2,105
| Where the money sits | $10,000 | $25,000 | $50,000 |
|---|---|---|---|
| Interest checking, national average 0.07% | $7 | $18 | $35 |
| Savings, national average 0.37% | $37 | $93 | $185 |
| 12-month CD, national average 1.73% | $173 | $433 | $865 |
| Ally Online Savings, 3.10% | $310 | $775 | $1,550 |
| Wealthfront Cash, 3.55% base | $355 | $887 | $1,775 |
| Axos ONE Savings, 4.21% with conditions | $421 | $1,053 | $2,105 |
Source: CalculatorAI · calculatorai.app · drafts/high-yield-savings-after-fed-hike-numbers.mjs — rates from FDIC (Sept 21) and the banks' own pages (Sept 28–29)
Two things stand out. First, the Fed hike itself is the smallest number in this article: a quarter point is $25 a year on $10,000 and $125 on $50,000, and only if your bank passes it through. Second, the spread between well-known online banks is now larger than the hike — Ally and Axos are more than a full point apart, which is $277 a year on $25,000. "High-yield" is a marketing label, not a rate; the rate is what you compare.
APR vs APYWhy the compounding question barely matters here
You will see both abbreviations on bank and card pages, and they are not the same number.
Rate per period × number of periods in a yearAPY = (1 + APR ÷ n)^n − 1, where n = compounding periods per yearBalance × APY (if the rate does not change)Banks are required to quote savings accounts in APY, so an APY-to-APY comparison is already apples to apples. The compounding frequency matters less than it sounds:
Annually
- APY
- 4.1000%
- Interest in a year
- $1,025.00
Quarterly
- APY
- 4.1635%
- Interest in a year
- $1,040.87
Monthly
- APY
- 4.1779%
- Interest in a year
- $1,044.48
Daily
- APY
- 4.1850%
- Interest in a year
- $1,046.24
Continuously (the mathematical ceiling)
- APY
- 4.1852%
- Interest in a year
- $1,046.30
| Compounding | APY | Interest in a year |
|---|---|---|
| Annually | 4.1000% | $1,025.00 |
| Quarterly | 4.1635% | $1,040.87 |
| Monthly | 4.1779% | $1,044.48 |
| Daily | 4.1850% | $1,046.24 |
| Continuously (the mathematical ceiling) | 4.1852% | $1,046.30 |
Source: CalculatorAI · calculatorai.app · drafts/high-yield-savings-after-fed-hike-numbers.mjs
Ally compounds daily; Capital One's 360 Performance Savings compounds and credits monthly. On a savings balance that difference is pocket change. Where APR vs APY does matter is debt: a credit card at the 23.82% average APR, with interest charged daily, costs 26.89% in APY terms. If you are comparing what your cash earns with what your card costs, convert both to the same basis — the APR to APY Calculator does it for any rate and compounding schedule.
Tax and inflationThe half of the rate you don't keep
Savings interest is taxed as ordinary income in the year it is credited — your bank sends a Form 1099-INT once it pays you $10 or more, and state income tax usually applies on top. Then inflation takes its share: the Bureau of Labor Statistics put consumer prices 3.4% higher in August 2026 than a year earlier. Put the three together and the picture changes:
0.37% (national average)
- 12% bracket
- −2.97%
- 22% bracket
- −3.01%
- 32% bracket
- −3.04%
3.10%
- 12% bracket
- −0.65%
- 22% bracket
- −0.95%
- 32% bracket
- −1.25%
3.55%
- 12% bracket
- −0.27%
- 22% bracket
- −0.61%
- 32% bracket
- −0.95%
4.21%
- 12% bracket
- +0.29%
- 22% bracket
- −0.11%
- 32% bracket
- −0.52%
| Advertised APY | 12% bracket | 22% bracket | 32% bracket |
|---|---|---|---|
| 0.37% (national average) | −2.97% | −3.01% | −3.04% |
| 3.10% | −0.65% | −0.95% | −1.25% |
| 3.55% | −0.27% | −0.61% | −0.95% |
| 4.21% | +0.29% | −0.11% | −0.52% |
Source: CalculatorAI · calculatorai.app · drafts/high-yield-savings-after-fed-hike-numbers.mjs — CPI-U, BLS, released Sept 11, 2026
At today's inflation, a saver in the 22% bracket needs about 4.36% just to stand still — 4.66% once a typical 5% state tax is added, and 5.00% in the 32% bracket. No mainstream savings account pays that right now. That is not an argument against high-yield savings; it is the correct way to think about them. A savings account is where you park money you may need at short notice — an emergency fund, a house deposit due next spring, next year's tax bill. Its job is to lose as little as possible while staying available. Against the 0.37% average, a 4.21% account turns a 3% annual loss of purchasing power into roughly break-even. Money you will not need for years belongs somewhere built to outrun inflation, which is a different decision — our pay off debt or invest guide prices that trade.
A $50,000 cash cushion at 4.21%, 22% federal bracket
The interest looks like a raise. The tax bill and the price level take most of it back — but compared with leaving the same money at the national average, the account still does its job.
Five years of saving$25,000 plus $300 a month
A year of interest is one snapshot. For a fund you are still building, the Savings Calculator's shape — a starting balance, a monthly contribution and a rate — is the useful one. Here is $25,000 plus $300 a month for five years ($43,000 contributed in total), assuming each rate holds:
0.37%
- Balance after 5 years
- $43,630
- Interest earned
- $630
- In today's dollars
- $36,914
3.10%
- Balance after 5 years
- $48,545
- Interest earned
- $5,545
- In today's dollars
- $41,071
3.55%
- Balance after 5 years
- $49,401
- Interest earned
- $6,401
- In today's dollars
- $41,795
4.21%
- Balance after 5 years
- $50,680
- Interest earned
- $7,680
- In today's dollars
- $42,878
| Account rate | Balance after 5 years | Interest earned | In today's dollars |
|---|---|---|---|
| 0.37% | $43,630 | $630 | $36,914 |
| 3.10% | $48,545 | $5,545 | $41,071 |
| 3.55% | $49,401 | $6,401 | $41,795 |
| 4.21% | $50,680 | $7,680 | $42,878 |
Source: CalculatorAI · calculatorai.app · drafts/high-yield-savings-after-fed-hike-numbers.mjs — monthly compounding derived from APY
The difference between the average account and the best one is $7,050 of interest over five years — more than a year and a half of the monthly contributions. The last column is the honest one: even at 4.21% the balance buys slightly less than the $43,000 you put in would have bought on day one. The account slows the leak; the contributions are what build the fund. Run your own balance, contribution and rate through the Savings Calculator, and use the Inflation Calculator to see what the result is worth in today's money.
Before you move your cashSix checks
Compare APY, not the headline word
“High-yield” covers everything from about 3% to above 4% today. On $25,000, each full point is $250 a year.
Read the conditions under the top rate
Direct-deposit minimums, a linked checking account, a balance cap, or a boost that expires after three months. Know the rate you get if you miss them.
Check FDIC or NCUA coverage
Coverage is $250,000 per depositor, per insured bank, per ownership category. Some app-based accounts spread cash across partner banks — check which banks hold yours.
Check access and transfer times
An emergency fund you cannot reach for three business days is less useful. Look at transfer limits and how long money takes to land in checking.
Set money aside for the tax
Interest is taxable in the year it is credited. At 22%, keep about a fifth of the interest for April — or adjust your withholding.
Re-check the rate twice a year
Online banks move rates with the Fed, but not always the same week or by the same amount. A reminder in March and September is enough.
How much should sit there in the first place? Our emergency fund guide works out the number from your own spending, and the 50/30/20 rule shows where the monthly contribution comes from. For the rest of the rate hike — what it did to credit cards, home-equity lines and mortgages — see what the Fed hike costs you.
Where these numbers come from
The policy decision (target range raised by a quarter point to 3.75%–4.00% on September 16, 2026, 12–0) is from the Federal Reserve's FOMC statement. National average rates (savings 0.37%, interest checking 0.07%, 12-month CD 1.73%) are the FDIC's National Rates, published September 21, 2026. Account rates were read on the banks' own pages: Axos ONE Savings 4.21% APY with the Axos ONE Checking qualification rules and the 1.00% base rate (accurate as of September 29, 2026); Ally Online Savings 3.10% APY, compounded daily (as of September 28, 2026); Wealthfront Cash 3.55% base APY; Capital One 360 Performance Savings compounding and crediting monthly. Inflation is the BLS CPI-U 12-month change for August 2026 (3.4%), released September 11, 2026; the 23.82% card APR is the average new-offer rate used in our Fed-hike guide. All dollar figures are arithmetic in drafts/high-yield-savings-after-fed-hike-numbers.mjs: balance × APY for one year; APY = (1 + APR/n)^n − 1; after-tax rate = APY × (1 − bracket); real return = (1 + after-tax rate) ÷ 1.034 − 1; the five-year table compounds monthly at the monthly equivalent of each APY with $300 added at the end of each month. Two assumptions flatter the numbers: rates are held constant (they are variable and could fall), and tax is federal only (most states add more). Two understate them slightly: inflation is held at 3.4% for five years, and no bonus or boost rate is counted. Accounts are named as examples of the published range on one day, not as recommendations. Nothing here is financial advice.
Frequently asked questions
How much interest will $10,000 earn in a high-yield savings account? At the rates advertised on September 29, 2026, between about $310 (3.10% APY) and $421 (4.21% APY, with conditions) in a year, before tax. In a savings account paying the FDIC national average of 0.37%, the same $10,000 earns about $37.
Did savings rates go up after the Fed hike? The Fed raised its target range by a quarter point on September 16, 2026, and online banks tend to follow with higher savings rates, though not all at once or by the full amount. Big-bank savings accounts near the 0.37% national average usually do not move. A quarter point is worth $25 a year per $10,000.
What is the difference between APR and APY? APR is the nominal annual rate; APY adds the effect of compounding, so it is what a year actually pays. Savings accounts are quoted in APY. A 4.10% rate compounded daily is a 4.185% APY — only $1.76 a year more than monthly compounding on $25,000.
Is interest from a high-yield savings account taxable? Yes. It is ordinary income in the year it is credited, reported on Form 1099-INT when it reaches $10 or more, and usually subject to state income tax as well. In the 22% federal bracket, a 4.21% APY keeps about 3.28% after federal tax.
Does a high-yield savings account beat inflation? Not by much right now. With consumer prices up 3.4% over the year to August 2026, a saver in the 22% bracket needs about 4.36% before tax to keep pace. A 4.21% account comes close to break-even; the 0.37% average loses about 3% a year in purchasing power.
