Where to Keep Your Emergency Fund
The account has one job: be there in a day and not lose value. What that rules out, what the yield is worth on $15,000, and why a CD you break at month five nets $64.
On a $15,000 emergency fund, the difference between the average savings account and a competitive one is $393 a year. The difference between a savings account and a certificate of deposit you have to break in month five is $122.79, in the savings account's favour, and you could touch the money.
This account has exactly one job, and the job is not to earn. It is to be there, at full value, on the worst Tuesday of the year. Once that is satisfied, the rate is worth an afternoon of attention and no more than that, and how much the fund should hold matters a great deal more than where it sits.
The two requirements, in order
One: you can have the money within about a day. Not a week, and not "after I sell something". A boiler engineer wants paying on the day, and the practical test is whether you have ever actually moved money out of the account. Most people have not, and discover the two-day hold at the worst moment.
Two: it cannot be worth less than you put in. Not "usually goes up". Cannot fall. This rules out every investment, and it rules them out for a specific reason rather than a general caution: the months that produce emergencies are correlated with the months markets fall. A redundancy round and a 20% drawdown are the same news story, and an emergency fund that has to be sold into one is not an emergency fund.
Everything else, the rate included, comes third. That ordering is the whole decision, and most articles reverse it by leading with the yield table.
What each account type does to those requirements
| Account | Reachable in a day? | Can it fall? | National rate, Aug 2026 | Verdict |
|---|---|---|---|---|
| Interest checking | Instantly | No | 0.07% | Fine for one month of essentials, wasteful for the rest |
| Savings account, same bank as checking | Instantly | No | 0.38% | Good for the first layer |
| Online savings account | One to two business days | No | Around 3% advertised | Where most of the fund belongs |
| Money market deposit account | Instantly, often with a cheque book | No | 0.63% | Works, and usually pays less than online savings |
| 12-month CD | Only by paying a penalty | Not in value, but the penalty eats interest | 1.71% | Wrong product. See below |
| Index fund or ETF | Two to three days after selling | Yes, badly | Not applicable | Disqualified by requirement two |
| I bonds | No, locked for twelve months | No | Not applicable | Disqualified by requirement one |
Two rows in that table are the ones people argue about, and both arguments are settled by arithmetic rather than preference.
What is the yield difference actually worth?
$15,000, held for a year:
| Where | Rate | Interest for the year |
|---|---|---|
| Interest checking, national average | 0.07% | $10.50 |
| Savings, national average | 0.38% | $57.00 |
| Money market, national average | 0.63% | $94.50 |
| Online savings | 3.00% | $450.00 |
$393 a year for moving from the national average to a competitive online account. That is one form, one transfer, and perhaps forty minutes including the bit where you look up whether the bank is FDIC-insured.
Then take the tax off, because nobody else does. Bank interest is ordinary income in the year you receive it, reported on a 1099-INT, so at a 22% federal marginal rate the real gain is $306.54, and less again if your state taxes it. $306.54 is still the best hourly rate in this article, and quoting the $393 without that adjustment is the kind of thing that makes a figure look bigger than it spends.
Worth keeping in proportion: on a $3,505 first stage, the same rate difference is $91.83 a year before tax. Real, and not a reason to delay building the fund while you research banks for a fortnight.
Why a CD is the wrong product, in numbers
The pitch for a CD is that you accept less access in exchange for a better rate. In August 2026 that trade was not even available: the FDIC's national 12-month CD rate was 1.71%, well below the 3% on offer from online savings accounts you can withdraw from whenever you like.
But assume you find a good one. Say 3.60% on a 12-month CD, against 3.00% in savings. Then in month five the boiler fails and you have to break it.
| Five months on $15,000 | National 12-month CD at 1.71% | Savings at 3.00% |
|---|---|---|
| Interest earned | $106.88 | $187.50 |
| Early withdrawal penalty, 60 days of interest | -$42.16 | None |
| Net | $64.71 | $187.50 |
The penalty is the part worth understanding, because it is where the whole product fails for this purpose. A typical schedule charges 60 days of interest on terms between three and twenty-four months, rising to 150 days on the longest ones. Sixty days of interest is two months of the CD's yield, handed back.
Which gives a clean break-even. For a CD to beat a savings account you can touch, it has to be held long enough that its rate advantage exceeds the two months it will cost you to leave:
| CD rate, against 3.00% savings | Months you must hold it to come out ahead |
|---|---|
| 3.60% | 11.8 |
| 4.00% | 7.9 |
| 4.50% | 5.9 |
A 60-basis-point advantage requires holding a 12-month CD for 11.8 of its 12 months. So the honest description of a CD at 3.60% against savings at 3.00% is not "slightly better with less access". It is a bet that you will not need your emergency fund this year, settled against you if you do, which is an odd thing to do with the account whose entire purpose is the year you need it.
None of that makes CDs bad. They are a reasonable place for money with a known date, such as a house deposit eighteen months out. An emergency fund has no date, and that is the mismatch.
The split-tier approach, once the fund is large
Above roughly $20,000 the two requirements start pulling in different directions, and a split resolves it without compromise.
Layer one: one month of essential spending, in a savings account at the same bank as your checking account. Instant transfer, any hour, no thinking. This is the layer that handles the $340 windscreen and the vet at 9pm.
Layer two: everything else, in an online savings account at a different institution. One to two days to move, better rate, and the delay is a feature rather than a cost: this money is for a redundancy or a boiler, and both give you a day.
Two things to check before splitting. Deposit insurance is at least $250,000 per depositor, per insured bank, per ownership category, so a fund at one bank is nowhere near the limit and splitting for safety is not the reason to do it. And if an app holds your money rather than a bank, find out which partner bank actually holds the deposit, because the coverage is counted at that bank and your balances there may combine.
When this does not apply
If your fund is under one month of essential spending. Keep it wherever it is and finish building it. The difference between 0.38% and 3% on $1,200 is $31.44 a year, and any hour spent optimising that is an hour not spent on the thing that actually matters.
If you bank somewhere for a reason that is not the rate. A credit union that answers the phone, or a bank that waived a fee when you were in trouble, is worth more than $393 a year to some people. Name the trade and keep the relationship. NCUA insurance covers credit unions on the same terms the FDIC covers banks.
If your income is irregular. Your buffer is withdrawn from regularly and on short notice, so it needs the instant-transfer treatment that layer one gets, even if it is the larger of your two cash accounts. That structure is in how to budget when your income changes every month.
If you are keeping sinking funds in the same place. Then the account needs frequent, easy withdrawals rather than deliberate friction, because sinking funds are meant to empty several times a year. Use two accounts with different settings rather than compromising on one.
Sources and assumptions. All national rates are the FDIC's national rates and rate caps published 17 August 2026: 0.07% interest checking, 0.38% savings, 0.63% money market, 1.71% 12-month CD. The 3% online figure is Ally's published savings APY, correct as of 18 September 2026, used as one named example rather than a recommendation, and the 60-day penalty schedule is from the same bank's published CD terms, which charge 60 days of interest on terms of 3 to 24 months and 150 days on terms of 49 months or longer. Deposit insurance limits are the FDIC's: at least $250,000 per depositor, per insured bank. Interest is taxable as ordinary income; see IRS Topic 403. The 22% marginal rate and the 3.60%, 4.00% and 4.50% CD rates are assumptions used to work the examples, not quoted offers.
