Yes, savings accounts accrue interest, but the amount depends on the rate your bank offers and how often it compounds

A savings account accrues interest when the bank pays you a percentage of the money you keep deposited. The bank uses your money to lend to other customers or invest it, and in return, it shares a portion of what it earns with you. That payment is interest. The rate varies widely—from nearly zero at some large banks to 4% or higher at online banks—and the frequency with which interest is added to your account (daily, monthly, or annually) affects how much you actually earn.

Interest accrual is not automatic in the sense that you do nothing and money appears. The bank calculates it based on your balance, applies the rate, and deposits the interest into your account. You then own that interest and can withdraw it or leave it to earn interest itself. The process is straightforward, but the details—how often it compounds, what balance it's calculated on, and whether fees reduce it—matter to your actual earnings.

Key Takeaways

  • Interest accrues on the balance you maintain in the account, calculated using the annual percentage yield (APY) the bank advertises.
  • Compounding frequency—daily, monthly, or annually—determines how quickly interest builds, because interest earned can itself earn interest.
  • Banks calculate interest on the average daily balance or the ending balance, depending on their method, so the timing of deposits and withdrawals affects your earnings.
  • Fees charged by the bank reduce the interest you keep, so a high rate at a bank with monthly fees may earn you less than a lower rate with no fees.
  • Interest rates change over time and vary dramatically between banks, so the rate you see today is not may provide to stay the same.

How banks calculate and pay interest

The bank starts with the annual percentage yield (APY), which is the rate it advertises. If a bank offers 4.50% APY, that is the yearly return you would earn if you left money untouched for a full year. The bank then divides that rate by the number of times it compounds per year. If it compounds daily, it divides 4.50% by 365, calculates interest on your balance that day, and adds it to your account. The next day, interest is calculated on the new, slightly higher balance—this is compounding.

The frequency of compounding matters. A bank that compounds daily will pay you more total interest over a year than one that compounds monthly, even if both offer the same APY. This is because daily compounding means your interest earns interest more often. After the first day, you have a tiny bit more in the account, and the next day's interest is calculated on that larger amount.

Some banks calculate interest on your average daily balance over the month, while others use your ending balance on the last day of the month. If you deposit a large sum mid-month and withdraw it before month-end, a bank using average daily balance will pay interest on the lower average, not the peak balance. This method is less common now, but it is worth checking your account terms.

Why interest rates vary so much between banks

A savings account at a large national bank might offer 0.01% APY, while an online bank offers 4.50% APY for the same type of account. The difference is not random. Large banks with many physical branches have higher operating costs—they pay rent, staff, and utilities. They can afford to pay depositors less interest because customers stay for convenience. Online banks have no branches, lower overhead, and can pass more of their earnings to depositors as interest.

Interest rates also follow the federal funds rate, which the Federal Reserve sets. When the Fed raises rates, banks typically raise the APY they offer on savings accounts. When the Fed lowers rates, banks lower APY. This means the rate you see today will not stay the same forever. A 4.50% account might drop to 3.50% if the Fed cuts rates, or rise to 5.00% if the Fed raises them.

Competition matters too. When many online banks offer high rates, others raise theirs to attract customers. When rates fall across the industry, individual banks have less incentive to compete on rate alone. Checking the current rates at several banks before opening an account is worth the time, because the difference between 0.50% and 4.50% on a $10,000 balance is $400 per year.

How compounding frequency affects your total earnings

Compounding is the engine of interest growth. The more often interest is added to your account, the more interest you earn on that interest. Here is a concrete example: if you deposit $10,000 at 4.00% APY and the bank compounds daily, after one year you have $10,408.08. If the same bank compounded annually instead, you would have $10,400. The difference is $8.08—small on $10,000, but it grows as your balance grows or as you leave money in longer.

Most online banks now compound daily, which is the most frequent option. Some older savings products or accounts at traditional banks compound monthly or quarterly. When comparing accounts, look for the APY figure, which already accounts for compounding frequency. Two banks offering the same APY will pay you the same amount over a year, regardless of how often they compound, because APY is the standardized measure.

What reduces the interest you actually keep

A high interest rate does not may provide high earnings if fees eat into the interest. Some savings accounts charge a monthly maintenance fee, an inactivity fee if you do not make deposits or withdrawals for a set period, or a fee for exceeding a withdrawal limit. A $5 monthly fee on an account earning $10 per month in interest cuts your earnings in half. Most online banks and many traditional banks now waive these fees, but it is worth confirming before opening an account.

Taxes also reduce what you keep. Interest earned on a savings account is taxable income. If you earn $400 in interest over a year, you report that on your tax return, and it is taxed at your ordinary income tax rate. This is different from capital gains or may have access to dividends, which may have lower tax rates. The bank will send you a 1099-INT form at tax time if you earned $10 or more in interest.

When interest stops accruing or slows down

Interest accrues as long as money sits in the account, but some accounts have limits on how many withdrawals you can make per month before fees explore or interest stops accruing. Federal rules used to cap savings account withdrawals at six per month, but that rule was suspended in 2020. However, individual banks may still impose limits or charge fees for excess withdrawals. Check your account terms to see if there are withdrawal restrictions that could affect your interest earnings.

If you close the account, interest stops accruing when ready. The bank pays out any interest earned up to the closing date, but no interest accrues after that. If you move money to a checking account or money market account, it may accrue interest at a different rate or not at all, depending on the account type.

How to compare interest rates across banks

The simplest way to compare is to look at the APY each bank advertises for its savings account. This figure already includes the effect of compounding, so you can compare directly. Write down the APY, the compounding frequency (usually daily), and any fees. Then calculate what you would earn on your expected balance over a year. If you plan to keep $5,000 in the account, multiply $5,000 by the APY. At 4.50% APY, that is $225 per year before taxes and fees.

Check whether the rate is promotional or permanent. Some banks offer a high rate for the first few months to attract new customers, then drop it. Read the fine print or call the bank to ask how long the rate lasts. Also confirm that the account type you want—a basic savings account, not a money market account or certificate of deposit—is what carries the advertised rate.

Frequently Asked Questions

Does interest accrue if I do not touch my account?

Yes. Interest accrues automatically based on your balance, whether you log in or not. You do not have to do anything. The bank calculates it and deposits it into your account on its schedule—usually daily or monthly—so your balance grows on its own.

What happens to interest if I withdraw money mid-month?

Interest is calculated on the balance present when the calculation happens. If your bank compounds daily, you earn interest on the full balance for each day you hold it. If you withdraw money on the 15th, you stop earning interest on that withdrawn amount from the 16th onward. Interest already earned stays in your account.

Can a bank lower my interest rate after I open the account?

Yes. Banks can change savings account rates at any time without notice. Your rate is not locked in. If rates fall across the industry, your bank will likely lower yours. You can move your money to another bank if the rate drops too far, though you will owe taxes on any interest earned in that tax year.

Is interest the same as dividends?

No. Interest is paid by banks on savings accounts and loans. Dividends are paid by credit unions on savings accounts and by companies on stock. The tax treatment is similar—both are taxable income—but the source and calculation differ. Credit union savings accounts earn dividends, not interest, though the effect is the same.

How much interest will I earn on $1,000?

It depends on the APY and how long you keep it there. At 4.50% APY, $1,000 earns $45 per year before taxes. At 0.01% APY, it earns $0.10 per year. The difference between banks is dramatic, so the rate matters far more than the amount you deposit.