Interest compounds and posts on a schedule set by your bank, not automatically every month

Savings account interest is calculated daily but paid out on a schedule your bank chooses—usually monthly, quarterly, or annually. The interest rate itself is stated as an annual percentage yield (APY), which means it describes what you would earn in a year. But that does not mean you wait a full year to see money. Most banks post interest monthly, some quarterly, and a few annually.

The timing matters because of how compounding works. When interest posts to your account, it becomes part of your balance. The next time interest is calculated, you earn interest on that interest too. A bank that compounds daily and posts monthly will give you more money than a bank that compounds and posts annually, even if both offer the same APY.

You can see exactly when your bank pays interest by checking your account agreement or the deposit terms page on their website. Look for the phrase "interest is credited" or "interest posting frequency." If you cannot find it, call the bank and ask: "How often do you post interest to savings accounts?"

Key Takeaways

  • Interest rates are quoted as annual percentages (APY) but most banks post the money monthly, not yearly.
  • Interest is calculated on your balance every day, but you only see it in your account when the bank posts it—usually the last day of the month or the first day of the next month.
  • Compounding means you earn interest on the interest that was already posted, so more frequent posting gives you slightly more money over time.
  • Your bank's deposit agreement or website terms will tell you the exact posting schedule; if it is not listed, the bank must disclose it on request.

The difference between how interest is calculated and when you see it

Banks calculate interest daily using your account balance at the end of each day. They add up all those daily calculations and then post the total to your account on a schedule. That schedule is separate from the calculation—this is the source of confusion.

Example: You have $10,000 in a savings account earning 4.50% APY. The bank calculates interest every day. On day one, it calculates $0.12 (roughly $10,000 × 0.045 ÷ 365). On day two, it calculates $0.12 again. It does this for 30 days. Then on the last day of the month, it adds all 30 days of interest together—about $3.70—and posts that amount to your account. You now have $10,003.70.

The next month, the bank calculates interest on $10,003.70, not $10,000. That is compounding. You earn a tiny bit more because the interest from month one is now part of your balance.

Monthly posting is most common; quarterly and annual are less frequent

Most large banks and online banks post interest monthly. Chase, Bank of America, Wells Fargo, and most online savings accounts (Ally, Marcus, Wealthfront) post on the last day of the month or the first day of the next month. You will see the deposit in your account within one to two business days.

Some banks post quarterly—every three months. Credit unions sometimes use quarterly posting. A few older or smaller banks post annually, though this is rare now because it makes the account less attractive to customers.

The posting date is usually the same every month. If your bank posts on the 31st and a month has only 30 days, it posts on the 30th. If you close your account mid-month, you still receive the interest that was earned up to the day you closed it, posted on the regular schedule.

APY already accounts for compounding, so do not double-count it

The annual percentage yield (APY) is not the same as the interest rate. APY includes the effect of compounding. If a bank advertises 4.50% APY, that number already assumes your interest will compound at whatever frequency the bank uses.

This means you do not need to do math to figure out how much compounding will add. The bank has already done it. If you deposit $10,000 at 4.50% APY and leave it untouched for one year, you will have $10,450 at the end of that year, regardless of whether the bank posts monthly, quarterly, or annually.

What changes with posting frequency is how the money gets there. Monthly posting means you see the balance grow 12 times. Annual posting means you see it grow once. But the final number is the same.

How to find your bank's posting schedule

Check your bank's website first. Most banks list deposit terms on the savings account product page. Look for "interest posting frequency," "compounding frequency," or "when interest is credited." Online banks usually make this straightforward to find because it is a selling point.

If the website does not say, check your account agreement. Banks are required to provide this in writing. You may have received it when you opened the account, or you can request it by phone or through your online banking portal.

If you still cannot find it, call the bank's customer service line and ask: "How often do you post interest to my savings account?" They must tell you. Write it down so you know when to expect the deposit each month.

What happens to interest if you withdraw money before posting day

Interest is calculated on your balance at the end of each day. If you withdraw money before interest posts, the interest calculation for the days you held the money still counts. You do not lose it.

Example: You have $10,000 on the 1st of the month. On the 15th, you withdraw $5,000. Interest was calculated on $10,000 for days 1–15 and on $5,000 for days 16–30. When the bank posts interest on the 31st, it posts the total of both periods. You get the interest you earned while you held the full balance, plus the interest you earned on the smaller balance.

The only exception is if your account has a minimum balance requirement and you fall below it. Some banks charge a fee or reduce the interest rate if your balance drops below a threshold. Check your account agreement to see if yours does.

Frequently Asked Questions

If my bank posts interest monthly, do I get paid 12 times a year?

Yes. If your bank posts monthly, you receive an interest deposit 12 times per year, usually on the last day of each month or the first day of the next month. The amount varies slightly each month because it depends on your balance and the number of days in that month.

Can I move money to a different account right before interest posts to earn more?

No. Interest is calculated based on your balance at the end of each day, not on where the money is on posting day. If you move $10,000 from savings to checking on the 30th, the interest for the 30th is calculated on the lower balance. You cannot game the system by moving money around.

Why do some banks advertise higher APY than others if they all post monthly?

The APY itself is higher, not the posting frequency. A bank offering 4.50% APY will give you more money than a bank offering 3.00% APY, even if both post monthly. The difference is in the rate the bank is willing to pay, not in how often they pay it. Shop for the highest APY, not the most frequent posting schedule.

Does interest post on weekends or holidays?

Banks post interest on their regular schedule regardless of the day of the week. If your bank posts on the 31st and the 31st falls on a Saturday, the interest posts on the 31st, but you may not see it in your account until the next business day. Holidays do not change the posting date, though you may see a one-day delay in when the deposit appears.

What if I have multiple savings accounts at the same bank?

Each account is separate. Interest is calculated and posted to each account on the same schedule, but the amounts are independent. A $5,000 balance in one account earns interest only on that $5,000; it does not combine with another account for interest purposes.