Interest is money the bank pays you for keeping your money there

When you deposit money into a savings account, the bank lends that money to other customers and businesses. In return, the bank pays you interest—a percentage of your balance, calculated and added to your account on a schedule the bank sets. The more money you keep in the account and the higher the interest rate, the more you earn.

Interest rates vary widely depending on the type of account and the bank. A traditional savings account at a large bank might pay 0.01% annually, meaning you earn almost nothing. A high-yield savings account at an online bank might pay 4% to 5% annually. The difference between these two accounts is substantial: on a $10,000 balance, one pays $1 per year while the other pays $400 to $500.

You do not have to do anything to earn interest once the account is open. The bank calculates it automatically and deposits it into your account on a regular schedule—usually monthly or daily, depending on the account terms.

Key Takeaways

  • Interest rates on savings accounts range from nearly 0% at traditional banks to 4% or higher at online banks, so comparing rates before opening an account matters.
  • Interest is calculated as a percentage of your account balance and added automatically on a schedule set by the bank, usually monthly or daily.
  • High-yield savings accounts typically require a minimum balance or offer lower rates if your balance drops below a threshold, so read the account terms before depositing.
  • The longer your money stays in the account untouched, the more interest compounds—meaning you earn interest on the interest you already earned.
  • Moving to a higher-rate account costs nothing and takes a few days, so checking rates annually helps you keep more of your earnings.

How banks calculate and pay interest

Banks use one of two methods to calculate interest: straightforward interest or compound interest. straightforward interest is calculated only on your original deposit. Compound interest is calculated on your original deposit plus any interest you have already earned. Most savings accounts use compound interest, which means your money grows faster the longer it sits.

The bank's stated rate is called the Annual Percentage Yield (APY). This is the actual return you will receive in one year if you do not withdraw money. It accounts for how often the bank compounds interest. A bank might advertise an interest rate of 4.50% APY, meaning that if you keep $10,000 in the account for one full year without touching it, you will have $10,450 at the end of the year.

Interest is usually credited to your account monthly, though some banks credit it daily. The more frequently interest is compounded, the slightly more you earn, because you earn interest on interest sooner. The difference is usually small—a few dollars per year on a typical balance—but it adds up over time.

Why rates differ between banks and account types

Large traditional banks (Chase, Bank of America, Wells Fargo) typically offer savings rates below 0.5% APY. Online banks (Marcus, Ally, American Express Personal Savings) often offer rates between 4% and 5.5% APY. Credit unions sometimes offer competitive rates as well. The reason is cost: online banks have lower overhead because they do not maintain physical branches, so they can afford to pay depositors more.

Within the same bank, different account types earn different rates. A money market account might pay more than a basic savings account. A certificate of deposit (CD) locks your money away for a set period—three months, one year, five years—and pays a higher rate in exchange for that commitment. If you withdraw from a CD early, you pay a penalty.

Banks also change their rates frequently, especially when the Federal Reserve changes its benchmark interest rate. When the Fed raises rates, banks gradually raise what they pay on savings. When the Fed cuts rates, banks cut what they pay. This means the rate you see today may not be the rate you earn six months from now.

Minimum balances and account requirements

Many high-yield savings accounts have no minimum balance requirement, but some do. A bank might require you to keep $500, $1,000, or $25,000 in the account to earn the advertised rate. If your balance drops below the minimum, the bank may pay a lower rate or charge a monthly fee.

Read the account disclosure document before opening an account. It will state the minimum balance requirement, the APY, how often interest is compounded, and any fees. Some banks waive the minimum if you set up automatic deposits or link the account to a checking account with the same bank.

A few banks offer tiered rates, where you earn more interest on larger balances. For example, balances under $25,000 might earn 4.5% APY, while balances of $25,000 or more earn 5.0% APY. This structure rewards customers who save more.

How to compare rates and switch accounts

Interest rates change constantly, so the rate you earn today may not be competitive in six months. You can check current rates on comparison websites like Bankrate, DepositAccounts, or NerdWallet, which list rates from dozens of banks and update them daily. You can also visit individual bank websites directly.

When comparing, look at the APY (not just the interest rate), the minimum balance requirement, how often interest compounds, and any fees. A 5.0% APY account with a $25,000 minimum is not better than a 4.8% APY account with no minimum if you only have $10,000 to deposit.

Switching to a higher-rate account is free and takes a few days. You can open a new account at a different bank and transfer your money electronically. Your old account remains open until you close it, though you can close it when ready or let it sit. There is no penalty for moving your money to earn a better rate.

What reduces or stops interest earnings

Withdrawals do not stop interest from accruing, but they reduce the balance on which interest is calculated. If you have $10,000 earning 5% APY and withdraw $5,000 mid-month, you will earn interest on the full $10,000 for part of the month and on $5,000 for the rest, depending on how the bank calculates daily balances.

Some savings accounts have withdrawal limits. Federal law previously capped savings account withdrawals at six per month, but that rule was suspended. However, individual banks may still limit withdrawals or charge a fee for excess withdrawals. Check your account terms to see if limits explore.

Fees also reduce your earnings. A monthly maintenance fee of $5 or $10 can wipe out months of interest on a small balance. This is why high-yield accounts with no fees are usually better than traditional bank accounts with fees, even if the rate is slightly lower.

Understanding compound interest over time

Compound interest is powerful because it accelerates growth. On a $10,000 balance at 5% APY compounded monthly, you earn about $512 in the first year. In the second year, you earn interest on $10,512, so you earn about $538. The difference is small at first, but over decades it becomes substantial.

A $10,000 deposit at 5% APY, left untouched for 10 years, grows to about $16,289. At 2% APY, the same deposit grows to about $12,190. The extra 3% in rate, compounded over a decade, adds more than $4,000 to your balance. This is why comparing rates and moving to higher-rate accounts matters, especially if you are saving for a long-term goal.

The longer your money stays in the account, the more compound interest works in your favor. This is one reason to keep an emergency fund in a savings account rather than checking—you earn money just by leaving it there.

Frequently Asked Questions

Do I have to pay taxes on interest I earn?

Yes. Interest income is taxable as ordinary income. Banks send you a 1099-INT form at the end of the year if you earned $10 or more in interest. You report this on your tax return. The amount is usually small on savings accounts, but it still counts as income.

What happens to my interest if I close the account?

You keep all interest you have already earned. When you close the account, the bank pays you the full balance including all accrued interest. Interest stops accruing once the account is closed.

Can I lose money in a savings account?

No. Savings accounts are insured by the Federal Deposit Insurance Corporation (FDIC) up to $250,000 per depositor per bank. Your money is safe even if the bank fails. You cannot lose your principal, though inflation can reduce what your money buys over time.

Is a high-yield savings account safe?

Yes, as long as the bank is FDIC-insured. Online banks like Marcus and Ally are FDIC-insured and offer the same protection as traditional banks. Check the bank's website or the FDIC's bank search tool to confirm it is insured before opening an account.

Should I move my money if rates drop?

Only if the rate becomes significantly lower than what other banks offer. Moving money costs nothing and takes a few days, so checking rates annually makes sense. If your current rate is 4.5% and competitors are offering 5.0%, moving is worth it. If the difference is 0.1%, the effort may not be worth the extra few dollars per year.