How your bank decides what interest rate you get

Your bank sets the interest rate on your savings account based on what the Federal Reserve does with its benchmark rate, which it adjusts several times a year. When the Fed raises rates, banks typically raise the rates they offer on savings accounts within weeks or months. When the Fed cuts rates, banks usually cut savings account rates faster than they raise them.

The actual rate you receive also depends on the type of account. A regular savings account usually earns less than a money market account or a certificate of deposit (CD) with the same bank. Banks also compete with each other — online banks often pay higher rates than brick-and-mortar banks because they have lower overhead costs. The amount of money you keep in the account does not change your rate at most banks, though some offer tiered rates where larger balances earn slightly more.

You can see what rate any bank is currently offering before you open an account. The bank must disclose the annual percentage yield (APY) in writing, which shows you exactly what you will earn on $100 or $1,000 over one year, accounting for how often the bank compounds interest.

Key Takeaways

  • Banks calculate interest using the annual percentage yield (APY), which tells you the real return you will earn in one year including compounding.
  • Interest is usually compounded daily or monthly, meaning the bank pays interest on your interest, and the frequency matters more when rates are higher.
  • Most banks deposit interest into your account monthly, though some do it quarterly or annually — check your account agreement to know when to expect it.
  • The interest rate your bank pays changes based on Federal Reserve decisions, and you can switch to a different bank if your current rate falls too far behind what others offer.

How compounding works and why it matters

Compounding means the bank pays interest on the interest you have already earned. If your account compounds daily, the bank calculates interest every single day and adds it to your balance, so the next day's interest is calculated on a slightly larger amount. If it compounds monthly, interest is calculated and added once per month.

The difference between daily and monthly compounding is small at current interest rates, but it grows as rates rise. At 0.01% APY, the difference is less than a penny per year on $1,000. At 4.5% APY, daily compounding on $1,000 earns about $46 per year while monthly compounding earns about $45.80 — a difference of 20 cents. The higher the rate, the more compounding frequency matters.

The APY already includes the effect of compounding, so you do not need to calculate it yourself. If a bank shows you 4.50% APY, that is the total you will earn in one year if you leave the money untouched and the rate does not change. The bank's disclosure will also tell you how often it compounds, but the APY is what you actually use to compare accounts.

When and how the bank deposits interest into your account

Most banks deposit interest monthly, on the last day of the month or the first day of the next month. Some deposit quarterly (every three months) or annually (once per year). The schedule depends on the bank and the account type — check your account agreement or the bank's website to find out when your interest posts.

When interest is deposited, it becomes part of your account balance and starts earning interest itself in the next compounding period. You can withdraw it without penalty at any time. The bank reports the total interest you earned in a calendar year on a Form 1099-INT, which you receive by January 31 of the following year and use to report the income on your tax return.

Interest deposits do not appear as separate transactions on most accounts — the bank simply adds the amount to your balance. If you want to track how much interest you have earned, you can check your account statement, which lists the interest deposit as a line item, or log into your online banking and look at the interest earned year-to-date.

What happens to your interest rate over time

Your interest rate is not locked in permanently. Banks can change the rate on a savings account at any time, and they usually do so in response to Federal Reserve decisions. When the Fed raises its benchmark rate, banks raise savings account rates within a few weeks. When the Fed cuts rates, banks cut savings account rates much faster — sometimes within days.

This means the rate you earn today may be different three months from now. If you opened an account at 4.50% APY and the Fed cuts rates, your bank may lower your rate to 4.00% or lower without your permission. You will receive notice of the change, usually by email or mail, before it takes effect.

If your bank's rate drops significantly, you can move your money to a different bank that is still paying a higher rate. There is no penalty for closing a savings account and moving to another bank. Many people move their savings to follow the highest available rates, especially when rate differences are large.

How to compare interest rates between banks

To compare rates fairly, always look at the APY, not the interest rate. The APY is the standardized number that accounts for compounding, so it tells you the true return. A bank advertising 4.50% APY will earn you the same amount as any other bank advertising 4.50% APY, regardless of how often they compound.

You can find current rates on bank websites, on financial comparison sites like Bankrate or DepositAccounts, or by calling the bank directly. The rates change frequently, so a rate you see today may be different next week. When you find a rate you want, open the account promptly if you plan to move money, because rates can drop without notice.

Pay attention to account minimums and fees as well. Some banks require a minimum balance to earn the advertised rate, or they charge monthly maintenance fees that reduce your earnings. A bank offering 4.50% APY with a $25,000 minimum and a $10 monthly fee may earn you less than a bank offering 4.25% APY with no minimum and no fees.

How interest income affects your taxes

Interest earned in a savings account is taxable income. If you earned $50 or more in interest during the calendar year, the bank sends you a Form 1099-INT by January 31. You report this amount on your tax return as interest income, and it is taxed at your ordinary income tax rate.

If you earned less than $50, the bank may not send a 1099-INT, but you are still required to report the interest on your tax return. You can find the exact amount on your account statements or by logging into your online banking and checking the year-to-date interest earned.

Interest earned in a regular savings account is always taxable. Interest in a Roth IRA or traditional IRA is not taxed in the year it is earned (though traditional IRA withdrawals are taxed later). If you are trying to minimize taxes on savings, a tax-advantaged account may make sense, but that is a separate decision from choosing which bank to use.

What to do if interest is not deposited when expected

If your bank normally deposits interest on the last day of the month and you do not see it by the third day of the next month, log into your account and check your recent transactions. Interest deposits sometimes appear with a delay of one or two business days, especially if you bank with a large institution.

If more than three business days have passed and the interest has not appeared, contact the bank's customer service. Provide the date you expected the deposit and the amount you were expecting based on your previous month's deposit. The bank can tell you whether the deposit is pending or whether there was an error.

Interest deposits are rarely lost or delayed, but if the bank made a mistake, it will correct it and deposit the missing interest plus any interest that would have been earned on that amount. Keep your account statements so you can verify the deposits match what you expect.

Frequently Asked Questions

Can I move my money to a higher-paying bank without losing interest?

Yes. Interest accrues daily, so you earn interest right up until the day you withdraw the money. When you move to a new bank, you start earning the new rate immediately. There is no penalty for closing a savings account or moving your balance.

What is the difference between APY and interest rate?

The interest rate is the percentage the bank pays per year before compounding. The APY is the actual return you get after compounding is included. Banks must show you the APY so you can compare accounts fairly. Use APY when comparing banks.

Do I have to pay taxes on interest I earned but have not withdrawn?

Yes. Interest is taxable in the year it is earned, even if it stays in your account. When the bank deposits interest into your account, it becomes income for that tax year, whether you withdraw it or leave it to earn more interest.

Why did my interest rate drop if I did not do anything?

Banks change savings account rates based on Federal Reserve decisions and market conditions. You will receive notice before the rate changes, but you cannot prevent it. If the new rate is too low, you can move your money to a different bank.

How much interest will I earn on my savings?

Multiply your account balance by the APY to estimate annual earnings. For example, $10,000 at 4.50% APY earns about $450 per year. The exact amount depends on your balance throughout the year and when interest is compounded, but the APY gives you a reliable estimate.