Interest is usually added to your account once a month, but the exact date depends on your bank

Most banks add interest to savings accounts on a monthly schedule — usually on the last day of the month or the first day of the next month. Some banks do it weekly or daily instead. The timing matters because it affects how much interest you actually earn, and it's one of the few things you can control by choosing when to deposit money.

Your bank's website or account agreement will tell you exactly when interest posts. Look for a section called "Interest Payment Schedule" or "Dividend Frequency" (credit unions often use the word "dividend" instead of "interest"). If you can't find it, call the bank and ask: "When does interest post to my account?" They can tell you the exact date.

Key Takeaways

  • Interest posts monthly at most banks, though some post weekly or daily — check your account agreement or call your bank to find out when.
  • The interest rate your bank advertises is an annual rate, but you earn a fraction of it each month based on your balance.
  • Interest is calculated on your lowest balance during the month at some banks, and on your average balance at others — this difference can cost you money.
  • Moving money in or out of your savings account just before interest posts can change how much you earn that month.

Why the posting date affects how much you earn

Banks calculate interest based on how much money you have in the account during a specific period. If your bank uses the "daily balance" method, it adds up what you had each day of the month and divides by the number of days. If it uses the "minimum balance" method, it only looks at your lowest balance that month — even if you had more money for most of it.

This means the day you deposit money matters. If you deposit $1,000 on the 28th and interest posts on the 30th, you might only earn interest on that $1,000 for two or three days. If you deposit on the 1st, you earn interest on it for the entire month. Over a year, the difference adds up.

Some banks also have a "grace period" — they won't charge you a fee if your balance drops below the minimum for a few days, but they also won't pay interest on those days. Read your account agreement to see if yours does this.

The difference between annual rate and monthly earnings

When a bank advertises a savings rate of 4.5% per year, that does not mean you earn 4.5% of your balance every month. It means you earn 4.5% per year if you leave the money untouched for twelve months. Each month, you earn roughly one-twelfth of that rate.

If you have $10,000 in an account earning 4.5% annually, you earn about $37.50 per month (before any fees). The exact amount depends on how many days are in that month and how your bank calculates interest. February will earn less than January because it has fewer days.

Banks calculate this using a formula that divides the annual rate by 365 (or sometimes 360), then multiplies by the number of days in the month and your balance. You do not need to do this math yourself — the bank does it and shows you the interest earned on your statement.

What happens if you withdraw money before interest posts

If you withdraw money a few days before interest posts, you lose the interest you would have earned on that amount. For example, if you have $5,000 on the 25th but withdraw $2,000 on the 28th, and interest posts on the 30th, you only earn interest on $3,000 that month.

This is why some people time their deposits and withdrawals around the interest posting date. If you know interest posts on the last day of the month, depositing on the 1st means your money earns interest for the full month. Withdrawing on the 30th means you keep that interest and can move the money elsewhere.

However, this strategy only works if your bank uses the daily balance method. If it uses the minimum balance method, you need to keep the full amount in the account for the entire month to earn interest on it.

How to find your bank's interest posting schedule

The fastest way is to log into your online account and look at your recent statements. Scroll through two or three months and note the date when the interest appears. It will show up as a deposit with a label like "Interest Paid" or "Dividend Paid."

If you cannot find it in your statements, check your account agreement. This is usually a PDF you can read from your bank's website, or you can ask for a printed copy. Search the document for "interest," "dividend," "posting," or "frequency."

If neither of those works, call your bank's customer service line. Have your account number ready and ask: "When does interest post to my savings account?" and "Do you use daily balance or minimum balance to calculate it?" Write down the answers so you have them for future reference.

How interest compounds when it posts monthly

Compounding means you earn interest on your interest. When your bank posts interest to your account, that interest becomes part of your balance. The next month, you earn interest on the original amount plus the interest from the previous month.

The more often interest posts, the more you earn through compounding. An account that posts daily will earn slightly more than one that posts monthly, all else equal. However, the difference is usually small — a few dollars per year on a typical balance. The interest rate itself matters much more than how often it posts.

For example, $10,000 earning 4.5% annually with monthly posting earns about $450 per year. The same $10,000 at 3.5% with daily posting earns about $350 per year. The higher rate beats the more frequent posting.

What to do if your bank posts interest on a date that does not work for you

You cannot change when your bank posts interest — that is set by the bank, not by you. However, you can choose a different bank if the posting schedule matters to your situation. Some online banks post interest daily, which means you earn interest every single day instead of waiting for a monthly posting date.

Before switching banks, compare the interest rate, not just the posting frequency. A bank that posts daily at 2% will earn you less than a bank that posts monthly at 4.5%. Also check whether there are any fees that reduce your earnings, such as monthly maintenance fees or minimum balance requirements.

If you are happy with your current bank for other reasons, the posting schedule is usually not worth switching over. The difference in earnings is typically small enough that convenience and customer service matter more.

Frequently Asked Questions

Does interest post on weekends or holidays?

Most banks post interest on business days only. If the scheduled posting date falls on a weekend or holiday, the bank usually posts the next business day instead. Check your account statement to see the actual date it posted, since this can vary by bank.

Can I move money to a different account right after interest posts?

Yes. Once interest posts to your account, it is yours to move or spend. You can transfer it to a checking account, another savings account, or withdraw it in cash without losing the interest you already earned.

What if my bank changes when it posts interest?

Banks can change their posting schedule, though they usually give customers notice. Check your statements every few months to confirm the posting date has not shifted. If it changes, your bank should notify you by email or mail before the change takes effect.

Does the interest posting date affect my taxes?

Yes. Interest is taxable income in the year it posts to your account, not the year you earned it. If interest posts in December, you report it on that year's tax return, even if you do not withdraw the money until January.

Why do some accounts post interest weekly instead of monthly?

Weekly posting allows your interest to compound more often, which means you earn slightly more over time. Some online banks use weekly or daily posting as a way to attract customers, since it sounds better even though the actual difference is small.