How Does a High-Yield Savings Account Actually Work?
A high-yield savings account is a savings account that pays a competitive APY. That’s all. It doesn’t lock up your money, there’s no investment risk, and no complicated structure underneath it. It’s the same kind of account you’ve had since you were a kid, except the rate attached to it is worth paying attention to.
So if it’s that simple, why does one savings account pay a fraction of a percent while another pays several times that? We’ll use Mitten as the example.
Where the yield comes from
Money in a savings account doesn’t sit in a vault with your name on it. Instead, the institution holding it lends most of it out as mortgages, auto loans, and other credit. The interest borrowers pay funds the interest you earn. That’s true of every savings account. The difference between a high-yield account and a traditional one is how much of that value gets passed back to depositors.
APY and interest rate are not the same number
The interest rate is the base percentage the account pays. The APY, or Annual Percentage Yield, is what you actually earn over a year once compounding is included. APY is always the higher of the two, and it’s the one worth comparing, because it accounts for the interest your interest earns.
Federal rules require deposit accounts to disclose APY, so you can compare two accounts by looking at one number. One distinction to keep straight, since financial marketing can make it seem blurry: APY is for deposit accounts, where you earn. APR is for loans, where you pay.
How compound interest works
Your account earns interest on your balance. When that interest is credited, it becomes part of your balance, and the next round is calculated on the new, larger number. Repeat that on a schedule and your balance grows a little faster each cycle, without you doing anything.
Mitten uses the daily balance method, so your balance is doing work every day rather than being sampled once a month, and it compounds and credits monthly, so earned interest joins your balance every month and starts earning on its own from there.
How balance tiers work
Plenty of high-yield accounts, including Mitten, are tiered. The APY depends on how much you’re holding. That’s what “earn up to” means on a savings page, but knowing the APY at every tier is helpful when making a decision about which account is right for you.
| Balance | APY |
|---|---|
| $100 to $2,499 | 0.05% |
| $2,500 to $9,999 | 3.01% |
| $10,000 or more | 4.01% |
The tiers are ascending, and you move between them as your balance changes, so saving a $2,500 balance automatically moves you up from 0.05% APY to 3.01% APY.
On a tiered account, the practical question isn’t just what the APY is, it’s what the APY is at the balance you’ll actually hold. Two accounts can advertise nearly the same headline number and pay very differently at $3,000.
Why the APY can change
Almost every high-yield savings APY is variable. It has to be since there’s no set term on the rate. A certificate pays a fixed APY because you’ve agreed to leave the money alone for a set period, while a savings account keeps your money available, so the rate moves with the broader rate environment.
Some accounts soften the variability. Newly opened Mitten accounts get a 180-Day Rate Protection Period starting on the opening date, which keeps the APYs and balance tiers that were in effect at opening, and passes on any increase that happens during the window. After 180 days, the account earns whatever the then-current tiers pay.
Fees, minimums, and how money moves
On some HYSAs, a monthly maintenance fee is subtracted from your balance regardless of what you earned, and on smaller balances it can cancel out the yield that made the account attractive. Mitten has no monthly maintenance fees at any tier. The account requires a $5 minimum first deposit, and dividends begin at $100. An account that stays below $100 for six months may be subject to closure, which matters if you plan to open one now and fund it later.
How money gets into and out of an account is another important factor to consider with any HYSA. A digital high-yield savings account isn’t a spending account. With Mitten, you link one external checking or savings account and move money between the two by ACH, usually in one to two business days. There’s no debit card, no checks, and no bill pay, and transfers out of the account are capped at $10,000 per transfer and $50,000 per month. That’s how a savings-only digital account behaves.
Is your money safe?
Deposits at federally insured credit unions are covered by the National Credit Union Share Insurance Fund, administered by the NCUA, for up to $250,000 per member, per ownership category, and that coverage is backed by the full faith and credit of the United States government. Your balance doesn’t fall because the market had a bad quarter. If you want the longer version, we’ve written a full post on how NCUA insurance works.
How to actually use a High Yield Savings Account
Your emergency fund is the obvious fit, since it’s money that can’t afford to lose value and needs to be reachable. Just plan for the transfer time by keeping a small buffer in checking for same-day surprises. Short-term goals are another good reason to open an HYSA. Anything on a timeline of months to a few years should work, because you get a competitive APY without committing to a term you might need to break.
When planning your savings, aim for a tier rather than a round number, because getting from $2,400 to $2,500 can change your APY substantially. And automate the transfer, because a recurring deposit the day after payday does more for your balance over a year than any amount of rate shopping.
How to open an HYSA
For Mitten Savings, it takes about five minutes, and you complete your application entirely online. U.S. citizens 18 and older who live, work, or worship in Michigan are eligible. There are no monthly maintenance fees, no minimum balance to open, and you get a 180-Day Rate Protection Period from the day you open. And because Mitten Savings is a division of Community Choice Credit Union, your money stays right here in Michigan, with a credit union that answers to its members because they own it.
Earn more, effortlessly.
**Rate lock offer, published tiers, and rate subject to change at any time.