Interest accrues daily, but deposits to your account happen on a different schedule

A high yield savings account adds interest to your balance every single day. The bank calculates how much you've earned based on your current balance and the annual percentage yield (APY) it promised you, then adds a tiny fraction of that to your account. This daily accrual is the standard across nearly all banks.

However, seeing that interest actually show up in your account — what's called posting or crediting — happens less often. Most banks post interest monthly, though some do it quarterly or even daily. The difference matters because until interest posts, you can't withdraw it or earn interest on it.

Think of it this way: the bank is keeping a running tally of what it owes you every day, but it settles the bill (deposits the money) on a schedule. Daily accrual means you're earning on your full balance from day one. Monthly posting means you wait up to 30 days to see the money, but you're not losing anything — the bank has been counting it the whole time.

Key Takeaways

  • Interest accrues daily at nearly all high yield savings accounts, meaning the bank calculates your earnings every day based on your balance and APY.
  • Interest posts (actually deposits into your account) on a schedule set by your bank, most commonly monthly, though some banks post quarterly or daily.
  • The APY quoted to you assumes daily accrual, so you don't need to do anything to earn the full rate — the bank handles the math automatically.
  • You earn interest on interest once it posts, because posted interest becomes part of your balance and starts earning its own interest the next day.

Why banks accrue interest daily instead of monthly

Daily accrual is the standard because it's the fairest way to calculate interest when your balance changes. If you deposit $5,000 on the 15th of the month, the bank needs to count that money as earning interest from day 15 onward, not from day 1. Daily accrual makes that possible.

Without daily accrual, a bank would have to choose: either ignore deposits made mid-month (unfair to you), or recalculate interest for the entire month every time someone deposits (complicated and expensive). Daily accrual solves both problems. It's also why the APY you see advertised already accounts for daily accrual — the bank has built that into the rate it's quoting you.

The difference between accrual and posting

Accrual is the calculation. Posting is the deposit. You need to understand both because they affect when you can use the money and when it starts earning interest on itself.

Let's say your account has a $10,000 balance on January 1st and your bank offers 4.50% APY with daily accrual and monthly posting. On January 2nd, the bank calculates that you've earned roughly $1.23 (that's $10,000 × 0.045 ÷ 365 days). That $1.23 is now "accrued" — the bank owes it to you — but it's not in your account yet. On February 1st, the bank posts all the interest it accrued during January (roughly $37) into your account. Now your balance is $10,037, and starting February 2nd, you earn interest on that $10,037, not just the original $10,000.

Some banks post interest daily instead of monthly. If yours does, you see the money appear every day, and you start earning interest on it when ready. The total amount you earn over a year is the same either way — the posting schedule doesn't change your APY — but daily posting lets you reinvest sooner if you want to move the money.

What happens if you withdraw money before interest posts

If you withdraw money before the interest posts, you lose the accrued interest that hasn't been deposited yet. The bank doesn't owe it to you until it posts.

For example: your balance is $10,000 on January 15th. By January 31st, you've accrued about $12 in interest, but it hasn't posted yet. If you withdraw $5,000 on January 30th, you walk away with $5,000 and lose the $12. On February 1st, the bank posts the interest it accrued before your withdrawal, but only on the days your balance was higher. You'll get less interest than if you'd waited one more day.

This is one reason to keep money in a high yield savings account if you know you won't need it for at least a month — you want to stay until the interest posts so you don't forfeit it.

How to find your bank's posting schedule

Your bank's website should state when it posts interest, usually in the account disclosures or the terms and conditions. Look for language like "interest is credited monthly" or "interest posts on the last day of each month." If you can't find it online, call the bank's customer service line and ask directly: "When does interest post to my account?"

Some banks let you choose your posting schedule (monthly, quarterly, or annually), which can matter if you're trying to minimize taxes on interest income in a given year. Most people leave it on the default monthly schedule.

The relationship between APY and daily accrual

The APY your bank advertises already assumes daily accrual and monthly (or more frequent) posting. You don't have to do anything to earn that rate. The bank has already done the math to figure out what daily accrual adds up to over a year, and that's the number they're quoting you.

If a bank offered the same APY but only accrued interest monthly instead of daily, you'd actually earn slightly less, because you'd miss out on earning interest on the interest that accrued early in the month. But this almost never happens — daily accrual is the industry standard, and the APY reflects it.

Frequently Asked Questions

Do I earn interest on interest in a high yield savings account?

Yes, once the interest posts to your account. The posted interest becomes part of your balance, and the next day it starts earning interest too. This is called compounding. The more often interest posts, the sooner compounding begins, but the difference is usually small — a few dollars a year on a typical balance.

What if my bank changes its APY after I open the account?

Banks can change APY at any time, and they usually notify you by email or mail. The new rate applies to interest accrued after the change date. If rates drop, your earnings drop too. If rates rise, you benefit. This is why high yield savings rates fluctuate — they're tied to the Federal Reserve's interest rate decisions.

Can I lose money if interest rates drop?

No. Your balance itself never shrinks because of a rate drop. You just earn less interest going forward. If you had $10,000 earning 4.50% APY and the rate drops to 3.00%, you still have $10,000 — you're just earning less on it each month.

Does it matter if interest posts daily or monthly?

Not much for most people. The total interest you earn over a year is the same. Daily posting lets you reinvest sooner if you want to move the money, but unless you're moving large amounts frequently, the difference in earnings is negligible — usually a few cents a year.