Your emergency fund shouldn't be sitting somewhere paying 0.01%. The good news is that there are two decent places to put it, and they're different enough that the choice matters. Let's take a popular option from each side and pick one.
The rates
As of mid-July 2026, the Capital One 360 Performance Savings account pays 3.00% APY on any balance, no fees, no minimums. Fidelity's Government Money Market Fund, ticker SPAXX, is posting a 3.30% 7-day yield.
| Capital One 360 Performance Savings | Fidelity Government Money Market Fund (SPAXX) | |
|---|---|---|
| Current yield | 3.00% APY | 3.30% 7-day yield |
| Account type | Bank savings account | Money market mutual fund |
| Protection | FDIC insured up to $250,000 | SIPC protected up to $500,000 |
| Spending access | Transfer to checking first | Debit card, checks, and Bill Pay via the Fidelity Cash Management Account |
On a $20,000 emergency fund that 0.30% gap is about $60 a year. Not life-changing, but it's free.
One clarification, since it matters later: SPAXX is a money market mutual fund you hold inside a Fidelity account, not a bank money market account. Different thing, different protection. Both rates also float. Capital One can change its APY whenever it likes, and the SPAXX yield tracks short-term interest rates.
Getting at your money
Rates get the attention, but access is where these two really differ.
Capital One's savings account is great if you're already in their ecosystem. Transfers to and from a 360 Checking account are close to instant, and you can pay a Capital One credit card straight from savings without routing it through checking first. The limitation is the one every savings account has. There's no debit card, and you can't hit an ATM without moving money to checking first. Transfers out to another bank usually take one to three business days.
Fidelity handles it differently. Open a Cash Management Account, set SPAXX as the core position, and your cash earns 3.30% while staying fully spendable. You get a Visa debit card with unlimited ATM fee reimbursements, checkwriting, and Bill Pay. Fidelity sells fund shares automatically to cover what you spend, so there's no transfer step at all. Savings and spending money live in the same account.
That's a real advantage, with one caveat. If you like your savings walled off from your spending money, the friction of a separate account isn't a flaw, it's the reason the account works for you. I'd take that seriously before optimizing it away.
What protects it
Here's where Capital One has the better answer.
The 360 Performance Savings account is FDIC insured up to $250,000 per depositor, per ownership category, backed by the full faith and credit of the US government. If the bank fails you get your money back, principal and interest, up to the limit. No depositor has ever lost a penny of FDIC-insured funds.
SPAXX is a security, so it gets SIPC protection instead. SIPC covers up to $500,000 per customer, including $250,000 in cash, if your brokerage fails and your assets go missing. Bigger number, but it's covering a different risk. SIPC doesn't protect you against the fund losing value. SPAXX targets a steady $1.00 share price and holds US government securities and repurchase agreements, which is about as low-risk as investing gets, but low risk and government-guaranteed aren't the same sentence. Fidelity does offer an FDIC-insured deposit sweep as an alternative core position, though it currently pays noticeably less.
So which one
Fidelity, with SPAXX as the core position.
You earn 3.30% instead of 3.00%, and you get a debit card, ATM fee reimbursements, Bill Pay, and checkwriting that a savings account can't give you. The SIPC-versus-FDIC tradeoff is real but small, since a government money market fund holding Treasury-backed paper is a conservative place to sit, and SIPC handles the brokerage-failure case.
A few things could flip it for you, though.
Capital One isn't the highest-paying savings account out there. Some online banks are advertising north of 4.00% APY right now, which beats SPAXX outright. They usually don't have the instant-transfer convenience, so you'd be trading speed for yield, but if you're chasing rate it's worth looking around.
The SPAXX yield isn't locked in either. If the Fed cuts, the 7-day yield follows within weeks, while banks tend to drag their feet lowering savings rates.
And SPAXX isn't FDIC insured. If that bothers you even a little, take the Capital One account and stop thinking about it. Peace of mind is worth 0.30% to plenty of people, and there's nothing wrong with being one of them.
Rates are current as of July 2026 and will change. Check capitalone.com and fidelity.com before you open anything. Educational only, not financial advice.