Interest posts on a schedule set by your bank, usually monthly or daily

Your bank calculates interest on the money in your savings account and deposits it into that same account on a regular schedule. Most banks post interest once a month, though some post it daily or quarterly. The schedule depends entirely on your bank's policy — you can find yours by logging into your account online, calling the bank, or checking your account agreement.

The amount you receive each month depends on three things: how much money you have in the account, the interest rate your bank is paying, and how many days are in that month. If you have $5,000 in an account earning 4.5% annual interest, you won't receive 4.5% of $5,000 in a single month — that rate is divided by 12 (or by 365, depending on how your bank calculates it). The math happens automatically; you don't have to do anything to receive it.

Interest begins accruing — building up — as soon as your deposit clears, but you won't see it in your account until the posting date. If you deposit money on the 15th of the month and your bank posts interest on the last day of the month, you'll earn interest for those 15 days even though you don't see the payment until later.

Key Takeaways

  • Your bank posts interest on a fixed schedule — usually the last day of the month — and you can find your bank's schedule in your account settings or by calling customer service.
  • The interest rate shown on your account is an annual rate, so you receive roughly one-twelfth of that amount each month, though the exact calculation varies by bank.
  • Interest starts building the day your deposit clears, even if it doesn't post to your account until weeks later.
  • You can track interest deposits by checking your monthly statement or your transaction history online.
  • If interest stops appearing, your rate may have changed, your account type may have shifted, or the bank may have closed the account — contact your bank to find out why.

How to find your bank's interest posting date

Log into your online banking portal and look for your account details or account agreement. Most banks list the interest posting date there. If you can't find it online, call the customer service number on the back of your debit card or visit a branch in person.

Some banks post interest on the same day each month — often the last day or the first day. Others post on a day that depends on when your account was opened. A few banks post interest daily but only show the total in your monthly statement. Ask your bank directly: "On what date do you post interest to my account?" and write it down so you know when to expect it.

Why the interest rate on your account is not the same as your monthly payment

Banks advertise interest rates as annual percentage yields, or APY. That number tells you what you'd earn in a year if the rate never changed and you never withdrew money. To find your monthly interest, divide the APY by 12. If your account earns 4.5% APY, you earn roughly 0.375% per month — which on $5,000 is about $18.75.

The exact amount varies slightly because banks use different methods to calculate daily interest. Some use a 360-day year; others use 365. Some calculate interest on your lowest balance during the month; others use your average balance. Your account agreement spells out which method your bank uses. The differences are usually small — a few cents — but they add up over time.

Interest rates also change. If your bank lowers its rate, your monthly interest payment will drop. If rates rise, you may earn more — though banks often raise rates slowly and don't always pass increases to existing customers. Check your statement each month to see whether the interest amount has changed.

What to do if interest stops appearing on your account

If you've been receiving interest regularly and suddenly stop seeing deposits, something has changed. The most common reasons are: your bank lowered the interest rate to zero or near-zero, your account type changed (for example, from a high-yield savings account to a regular checking account), you fell below a minimum balance requirement, or the bank closed the account.

Call your bank and ask: "Why is interest no longer posting to my account?" Have your account number ready. The bank can tell you whether the rate changed, whether you met the terms of the account, and what your options are. If the rate dropped and you want to earn more, ask about switching to a different account type or moving your money to a different bank.

If your bank closed the account without your permission, ask why. Banks sometimes close accounts for inactivity (no deposits or withdrawals for a long time) or for other reasons. The bank must return your money, usually within a few business days, though it may send a check rather than a transfer.

How interest compounds if you leave it in the account

Each time your bank posts interest, that interest becomes part of your balance. The next month, you earn interest on the original amount plus the interest from the previous month. This is called compounding, and it means your money grows faster the longer you leave it alone.

The effect is small at first. On $5,000 earning 4.5% APY, you earn about $18.75 in the first month. In the second month, you earn interest on $5,018.75, so you receive slightly more than $18.75. Over a year, compounding adds up to real money — roughly $230 instead of $225 if interest were not compounding. Over five years, the difference becomes much larger.

You don't have to do anything to make compounding happen. It occurs automatically as long as you leave the money in the account and the interest rate stays the same.

Tracking interest on your statement and tax forms

Your monthly statement shows each interest deposit as a separate transaction. You can also see the total interest earned in a given year by looking at your year-end statement or by adding up the monthly amounts yourself.

If you earned more than $10 in interest during the year, your bank will send you a Form 1099-INT by January 31st. This form reports the interest to the IRS and to you. You must include this amount on your tax return. If you earned less than $10, the bank may not send a form, but you still owe tax on the interest — you can find the total on your year-end statement.

Keep your statements or print them from your online account. The IRS may ask you to prove how much interest you reported, and your statements are the easiest proof.

Frequently Asked Questions

Can I withdraw my interest before it posts?

No. Interest doesn't exist in your account until the bank posts it on the scheduled date. Before that date, the interest is calculated but not yet deposited. Once it posts, you can withdraw it like any other money in your account.

What happens to my interest if I close the account?

You keep any interest that has already posted to your account — it's your money. Interest that has accrued but not yet posted may or may not be paid, depending on your bank's policy. Ask your bank before you close the account if you want to know whether you'll receive accrued interest.

Why did my interest rate drop to almost nothing?

Interest rates on savings accounts follow the Federal Reserve's benchmark rate, which changes over time. When the Fed lowers rates, banks lower the rates they pay on savings accounts. Your bank may have also changed your account type or you may have fallen below a minimum balance. Call your bank to find out which happened.

Do I have to report interest income if I only earned a few dollars?

Yes. Any interest you earn is taxable income, even if it's only a few dollars. If you earned more than $10, your bank sends you a Form 1099-INT. If you earned less, you still report it on your tax return using the amount from your year-end statement.

Can I move my money to earn interest faster?

Moving money to a different bank won't make interest post faster — posting schedules are set by each bank. However, different banks pay different rates. If your current bank pays 0.5% APY and another bank pays 4.5% APY, moving your money will earn you significantly more interest each month, even though the posting schedule is the same.