Interest posts to your account daily, weekly, or monthly depending on your bank, but the frequency of posting does not change how much total interest you earn in a year
Banks calculate interest on your savings account balance every single day. The amount they calculate is tiny — usually a fraction of a cent — but it compounds, meaning interest earns interest. However, the bank does not add that daily calculation to your account immediately. Instead, most banks post interest monthly, meaning you see the money hit your account once a month. Some banks post weekly or quarterly. The posting schedule is separate from the calculation schedule, and changing when interest posts does not change your annual return.
What matters for your total earnings is the annual percentage yield (APY), which is the rate the bank advertises. A savings account with 4.50% APY will earn the same amount over a year whether the bank posts interest monthly or daily — the posting frequency just changes when you see the money appear in your balance.
Key Takeaways
- Banks calculate interest daily but usually post it to your account once a month, so you see a lump deposit rather than daily additions.
- The annual percentage yield (APY) is what determines your total earnings for the year, not how often interest posts.
- High-yield savings accounts at online banks typically post interest monthly, while some credit unions or specialty accounts may post weekly or quarterly.
- Interest begins accruing the day you deposit money, but you will not see it in your balance until the bank's next posting date.
Why banks calculate daily but post monthly
Daily calculation allows the bank to account for changes in your balance throughout the month. If you deposit $5,000 on the 15th, the bank calculates interest on that $5,000 for the remaining days of the month, then calculates on your full balance starting the 1st of the next month. This method is more accurate than calculating interest only on your opening balance.
Monthly posting is standard because it simplifies accounting for both the bank and you. Instead of seeing dozens of tiny deposits, you see one interest payment once a month. Most major banks — Chase, Bank of America, Wells Fargo, and online banks like Marcus, Ally, and American Express Personal Savings — post interest on the last day of the month or the first few days of the next month.
Some banks post on different schedules. Credit unions sometimes post quarterly (four times a year), and a few specialty accounts post weekly. Check your account agreement or call your bank to confirm the exact posting date, especially if you are comparing accounts and want to know when to expect deposits.
How the APY tells you what you will actually earn
The APY is the only number you need to compare savings accounts, because it already accounts for compounding and posting frequency. A 4.50% APY means that if you keep $10,000 in the account for a full year without touching it, you will earn $450 in interest by the end of that year — regardless of whether the bank posts interest monthly, weekly, or daily.
The reason is that APY is calculated as if interest compounds daily and is expressed as an annual rate. Banks are required by law to disclose APY the same way, so you can compare directly. A 4.50% APY at one bank is equivalent to a 4.50% APY at another bank, even if one posts monthly and the other posts weekly.
What does change your earnings is the balance you maintain and how long you keep the money in the account. If you deposit $10,000 and withdraw $5,000 after six months, you earn interest only on the $10,000 for six months and the $5,000 for six months — the bank calculates based on your actual daily balance.
When interest starts and stops accruing
Interest begins accruing the day your deposit clears into the account, not the day you initiate the transfer. If you transfer money on a Monday but it does not clear until Wednesday, interest starts on Wednesday. Most transfers between accounts at the same bank clear the same day or next business day. Transfers from other banks typically take one to three business days.
Interest stops accruing the day you withdraw money. If you withdraw funds on the 20th, you earn interest through the 19th. The interest you have already accrued — even if it has not posted yet — is yours to keep. If your bank posts interest on the last day of the month and you withdraw money on the 25th, you still receive the interest that was calculated through the 24th when it posts on the 31st.
How to find your bank's posting schedule
Log into your online banking account and look at your recent transactions. You will see a deposit labeled "Interest" or "Interest Paid" on the same date each month. That is your posting date. If you cannot find it in recent history, check your account agreement or disclosures — most banks include the posting schedule there.
You can also call your bank's customer service line and ask directly. Have your account number ready. They can tell you the exact date interest posts and confirm your current APY. If you are considering opening a new account, ask about the posting schedule before you open it — it will not affect your earnings, but it helps you plan when to expect deposits.
What happens if you close your account before interest posts
If you close your account before the interest posting date, you forfeit the interest that has been calculated but not yet posted. For example, if your bank posts interest on the last day of the month and you close your account on the 20th, you lose the interest earned from the 1st through the 20th. This is one reason to time account closures carefully if you have a balance earning interest.
To avoid losing interest, close your account after the posting date. If you know you are closing an account, wait until after interest posts, then withdraw the full balance including the interest deposit. Some banks will mail you a check for accrued interest if you ask, but this is not may provide — check your account agreement or ask before you close.
Comparing posting frequency across account types
| Account Type | Typical Posting Frequency | Notes |
|---|---|---|
| Online savings accounts | Monthly | Marcus, Ally, American Express, Discover, and most online banks post on the last day of the month or first few days of the next month. |
| Traditional bank savings accounts | Monthly | Chase, Bank of America, Wells Fargo, and most brick-and-mortar banks post monthly, though rates are typically lower than online banks. |
| Credit union savings accounts | Quarterly or monthly | Varies by credit union. Check your account agreement or contact your credit union directly. |
| Money market accounts | Monthly | Most money market accounts post interest monthly, similar to savings accounts. |
| Certificates of deposit (CDs) | Monthly or at maturity | Some CDs post interest monthly; others hold all interest until the CD matures and pay it in a lump sum. |
Frequently Asked Questions
Does interest post on weekends or holidays?
No. Banks post interest on business days only. If your posting date falls on a weekend or federal holiday, the interest posts on the next business day. You will still receive the full amount — the delay is just administrative.
Can I move money between accounts on the posting date to earn more interest?
No. Interest is calculated based on your actual daily balance in each account. Moving money the day before posting does not increase your earnings — the bank has already calculated interest based on where the money actually was each day of the month.
What if my bank changes its APY after I deposit money?
The new rate applies to future interest calculations, not retroactively. If your bank lowers the rate, interest earned before the change date is unaffected. If the rate rises, you benefit from the higher rate going forward. Check your account statements to see when rate changes take effect.
Do I have to do anything to receive the interest that posts?
No. Interest posts automatically on the scheduled date. You do not need to take any action. The money appears in your account balance, and you can withdraw it or leave it to earn interest on top of the interest.
Is interest taxable?
Yes. Interest earned on savings accounts is taxable income. Your bank will send you a 1099-INT form at the end of the year if you earned $10 or more in interest. You report this on your tax return. This is true regardless of when the interest posts — it is taxable in the year it is earned, not the year it is posted.