Interest accrues daily, but posts to your account on a schedule set by your bank
The interest your savings account earns is calculated every single day based on your balance. That daily calculation is called accrual. But the money does not appear in your account every day — your bank collects those daily accruals and deposits them into your account on a schedule, usually monthly or quarterly. The timing between when interest accrues and when it actually shows up in your balance matters if you are trying to understand how much you will earn or when you can withdraw it.
Most banks accrue interest daily and post it monthly. Some post quarterly (every three months). A few post weekly or semi-monthly. The frequency is set by your bank's terms, not by you, and it does not change based on your balance or how long you have held the account. Once interest posts, it becomes part of your balance and earns interest itself in the next accrual cycle — this is called compounding.
Key Takeaways
- Interest accrues every day based on your current balance, but your bank deposits that interest into your account on a fixed schedule — usually once a month.
- The frequency of posting (monthly, quarterly, weekly) is determined by your bank and appears in your account agreement or deposit terms.
- Once interest posts to your account, it becomes part of your balance and earns interest in the next accrual cycle.
- The annual percentage yield (APY) your bank advertises already accounts for the compounding effect of regular posting, so you do not need to calculate it yourself.
- Interest that has accrued but not yet posted is not yet yours to withdraw — it belongs to the bank until the posting date.
How daily accrual works
Your bank calculates interest on your account balance every calendar day. The calculation uses a straightforward formula: your balance multiplied by the annual interest rate, divided by 365 (or 360, depending on the bank's method). If your balance is $10,000 and your rate is 4.50% annually, the bank calculates roughly $1.23 in interest for that day.
This happens whether you deposit money, withdraw money, or do nothing. If your balance changes mid-day, most banks use the balance at the end of the day for that day's calculation. Some use an average of your balance throughout the day, but this is less common for savings accounts. The daily accrual continues every single day the account is open, including weekends and holidays — the calendar does not pause.
The bank keeps a running total of all these daily accruals. By the end of the month, that total might be $35 or $40 in interest earned. On the posting date, the bank transfers that accumulated amount into your account as a single deposit.
When interest actually posts to your account
Posting dates vary by bank. The most common schedule is the last day of the month or the first business day of the next month. Some banks post on the 15th and last day of the month (semi-monthly). Others post quarterly — on March 31, June 30, September 30, and December 31, for example. A few online banks post weekly, usually on Fridays.
You can find your bank's posting schedule in the account agreement or deposit terms document you received when you opened the account. If you cannot find it, call your bank or check the account details section of your online banking portal — many banks list it there. The posting date does not change based on holidays; if your bank posts on the last day of the month and that day is a weekend, the posting usually happens on the last business day instead.
The day interest posts is the day it becomes part of your available balance. Until that day, the accrued interest exists in the bank's system but is not yet in your account. You cannot withdraw it, and it does not yet earn interest itself.
The difference between accrual and posting matters for your timeline
If you are tracking how much interest you will earn in a given month, remember that interest accrues daily but posts on a specific date. This means if you deposit $5,000 on the 20th of the month and your bank posts interest on the last day of the month, you will earn interest on that $5,000 for only 10 or 11 days that month. The full month's interest on that deposit will not appear until the next posting cycle.
Similarly, if you withdraw money just before the posting date, the interest that has already accrued on that money will still post to your account — you do not lose it. But interest accrues only on the balance you actually hold each day. If you withdraw $2,000 on the 25th and your bank posts on the 30th, the interest posted on the 30th will reflect the lower balance for those five days.
This is why the timing of deposits and withdrawals can slightly affect your monthly interest earnings, though the difference is usually small unless you are moving large amounts.
How compounding works with regular posting
Once interest posts to your account, it becomes part of your balance. The next day, your bank begins accruing interest on that new, higher balance — including the interest you just earned. This is compounding, and it is why the interest you earn grows slightly faster over time.
If your account has $10,000 and earns 4.50% annually with monthly posting, you earn roughly $37.50 in the first month. That $37.50 posts on the last day of the month, bringing your balance to $10,037.50. In the second month, you earn interest on $10,037.50, not just the original $10,000. The difference is small month to month, but over a year or several years, compounding adds up.
The annual percentage yield (APY) your bank advertises already includes the effect of compounding at your bank's posting frequency. You do not need to calculate it yourself — the APY is the actual rate you will earn if you hold the account for a full year without deposits or withdrawals.
What happens if your bank changes the interest rate
Banks can change savings account interest rates at any time. When they do, the new rate typically takes effect on the next posting date or on a date the bank specifies in a notice. The rate change applies to the balance you hold on that date going forward.
If your rate drops from 4.50% to 4.00%, the interest accrued at the old rate will still post at the old rate on the next posting date. Starting the day after that posting, your balance will accrue interest at the new 4.00% rate. You will not lose any interest you have already earned, but future interest will be calculated at the lower rate.
Rate changes are common in savings accounts because rates are tied to the Federal Reserve's benchmark rate, which moves frequently. Your bank will notify you before a rate change takes effect, usually by email or through your online banking portal.
How to track your accrued interest before it posts
Most online banking portals show your current balance and your posted interest separately. Some banks also display accrued but unposted interest in a section labeled "pending interest" or "accrued interest." This is informational only — you cannot withdraw it until it posts.
If your bank does not show accrued interest in the portal, you can calculate it yourself using your current balance and annual rate. Multiply your balance by the annual rate, divide by 365, and multiply by the number of days since the last posting date. This gives you a rough estimate. The actual amount may differ slightly because your balance may have changed during that period.
Alternatively, you can call your bank or use their customer service chat to ask how much interest has accrued since the last posting date. They can give you the exact figure.
Frequently Asked Questions
Does interest accrue on weekends and holidays?
Yes. Your bank calculates interest every calendar day, including Saturdays, Sundays, and federal holidays. The posting date may shift if it falls on a weekend, but the accrual itself does not pause.
Can I withdraw accrued interest before it posts?
No. Accrued interest is not part of your available balance until it posts to your account. Once it posts, it becomes part of your balance and you can withdraw it like any other money.
What if I close my account before interest posts?
You will receive any accrued interest up to the day you close the account. The bank will either deposit it into the account before closing it or send it to you separately, depending on the bank's process. Check with your bank about their specific procedure.
Does the posting frequency affect how much interest I earn in a year?
The posting frequency affects the compounding effect slightly. More frequent posting (weekly versus quarterly) means your interest starts earning interest sooner, so you earn marginally more over a year. However, the APY already accounts for this, so the advertised rate is what you will actually earn.
Why do some banks post interest quarterly instead of monthly?
Banks choose their posting schedule based on their operational systems and customer base. Online banks often post monthly because it is simpler and more transparent to customers. Older banks or those with legacy systems may post quarterly. The posting frequency does not indicate the quality of the account — what matters is the APY and whether the rate is competitive.