Interest posts to your account on a schedule set by your bank, not continuously
Your bank calculates interest on your savings balance every day, but it does not pay that interest every day. Instead, it compounds the interest at intervals — usually daily, monthly, or quarterly — and then posts the actual payment to your account on a fixed schedule. The posting schedule is what matters to you, because that is when the money actually appears in your account and starts earning interest itself.
Most banks post savings account interest monthly. Some post quarterly (four times a year). A few online banks post daily. Your bank's disclosure document — called the Truth in Savings Act disclosure or deposit agreement — states exactly when interest posts. You can find this on your bank's website or ask a teller to show you the current version.
The timing affects how much you earn, because once interest posts, that money becomes part of your balance and earns interest too. If your bank posts monthly and you have $10,000 in the account, you earn interest on $10,000 in month one, then on $10,000 plus that month's interest in month two, and so on. This is called compounding.
Key Takeaways
- Interest posts on a schedule your bank sets — usually monthly, sometimes quarterly or daily — not continuously throughout the month.
- Your bank calculates interest daily based on your balance, but the actual payment only appears in your account on the posting date.
- More frequent posting (daily or monthly) means your interest earns interest sooner, which compounds your returns over time.
- The interest rate and compounding frequency are both listed in your bank's deposit agreement, which you can request or view online.
- Withdrawals made before the posting date do not earn interest for that period, even if you had the money in the account most of the month.
How daily calculation and monthly posting work together
Here is the actual sequence. Every day, your bank looks at your account balance at the end of business and applies the annual interest rate to that balance. If your rate is 4.5% annual and your balance is $10,000, the bank calculates $10,000 × 0.045 ÷ 365 = $1.23 in interest for that day. It does this for every day of the month.
At the end of the month, the bank adds up all those daily interest amounts and posts the total to your account in one lump sum. If you earned $1.23 per day for 30 days, you would see roughly $36.90 posted to your account on the posting date (the exact amount depends on your balance each day and the number of days in the month). From that moment on, that $36.90 is part of your balance and earns interest too.
This is why the posting schedule matters more than you might think. If your bank posts interest on the 1st of each month and you withdraw money on the 15th, you still earn interest on your full balance for the entire month — the withdrawal does not erase the interest you already earned. But if you withdraw money on the 1st, before interest posts, you miss that month's interest entirely.
Why some banks post more often than others
Online banks and some credit unions post interest daily or weekly because they have lower operating costs and want to attract customers. Daily posting means your interest starts earning interest when ready, which compounds faster. Over a year, daily compounding on a $10,000 balance at 4.5% yields about $460 in interest, while monthly compounding yields about $459 — a small difference, but it adds up on larger balances or higher rates.
Traditional brick-and-mortar banks often post monthly or quarterly because they have higher costs and less incentive to compete on compounding frequency. The difference between monthly and quarterly posting is more noticeable: quarterly posting on $10,000 at 4.5% yields roughly $457 in interest over a year, compared to $460 with monthly posting.
The interest rate itself matters far more than the posting frequency. A savings account at 4.5% posted monthly will earn you more than an account at 0.01% posted daily. When comparing banks, look at the annual percentage yield (APY), which already accounts for compounding frequency. The APY is the actual return you will see over a year.
What happens to interest if you close your account
If you close your account before the interest posting date, you forfeit the interest that has been calculated but not yet posted. If your bank posts on the 1st of the month and you close your account on the 20th, you lose the interest earned from the 1st through the 20th. Some banks will pay out accrued interest when you close, but most do not — check your bank's policy before you close.
Interest that has already posted is yours to keep. Once it appears in your account, it is part of your balance and moves with you if you transfer the money elsewhere.
How to find your bank's posting schedule
Your bank's deposit agreement or Truth in Savings Act disclosure lists the compounding method and posting frequency. Log into your online banking portal and look for "Account Disclosures" or "Deposit Agreement." If you cannot find it online, call your bank's customer service line or visit a branch and ask for the current disclosure for your specific account type.
The disclosure will say something like "Interest is compounded daily and posted monthly" or "Interest is compounded and posted daily." It will also state the interest rate and the annual percentage yield (APY). The APY is the number that matters most — it tells you the actual return you will earn in a year, accounting for how often interest compounds.
If your bank has changed its posting schedule, you should have received notice by mail or email. If you have not received a disclosure in the past year, request one — banks are required to provide it, and it is the only official source for your account's terms.
Interest posting and minimum balance requirements
Some savings accounts require you to maintain a minimum balance to earn interest. If your account has a $500 minimum and your balance drops to $400 on day 15, your bank may not pay interest for that month, or it may pay interest only on the amount above the minimum. Check your disclosure to see whether your account has a minimum balance requirement and what happens if you fall below it.
A few banks use a different method called the "low balance method," where they calculate interest based on your lowest balance during the month rather than your daily balance. This is rare and usually only appears in older accounts or accounts with very low rates. If your disclosure mentions this, it is worth switching to a bank that uses daily balance calculation, because you will earn more.
How interest posting affects your account during transitions
If you transfer money into a savings account a few days before the posting date, that money will not earn interest until the next posting period. If you transfer $5,000 into an account on the 25th and interest posts on the 1st, you will not see interest on that $5,000 until the following month. This is not a penalty — it is just how the timing works. The bank calculates interest based on your balance at the end of each day, so money that arrives late in the month earns interest starting the next day, but that interest does not post until the next scheduled posting date.
The same applies to withdrawals. If you withdraw money on the 28th and interest posts on the 1st, the interest that posts on the 1st is based on your balance before the withdrawal. You earned it, so you keep it.
Frequently Asked Questions
Does my interest earn interest?
Yes, once interest posts to your account, it becomes part of your balance and earns interest in the next compounding period. This is called compound interest. The more often your bank posts interest, the sooner your interest starts earning interest.
What if I have multiple savings accounts at the same bank?
Each account has its own balance and earns interest separately. Interest posts on the same schedule for all accounts of the same type at that bank, but the amount you earn depends on each account's individual balance.
Can I request that my bank post interest more often?
No. The posting schedule is set by the bank and applies to all customers with that account type. If frequent posting matters to you, you can switch to a bank that posts daily or weekly.
Does interest post on weekends or holidays?
Banks post interest on their scheduled date regardless of whether it falls on a weekend or holiday. If your bank's posting date is the 1st and the 1st is a Sunday, interest still posts on the 1st, and you will see it in your account by the next business day.
What if my interest rate changes between now and the posting date?
Your bank calculates interest based on the rate in effect on each day. If your rate changes mid-month, the interest earned before the change uses the old rate, and interest earned after the change uses the new rate. The total is posted together on the posting date.