The interest you earn depends on the bank's rate and how much money you keep in the account

A savings account earns interest — money the bank pays you for letting them use your deposit. The amount you earn each month or year depends on two things: the Annual Percentage Yield (APY) the bank offers, and the balance you maintain. A bank offering 4.5% APY on a $1,000 balance will pay you roughly $45 per year. The same rate on $10,000 pays roughly $450 per year. The bank sets the rate; you cannot negotiate it, but you can shop for better rates by comparing different banks.

Interest compounds, meaning you earn money on the money you already earned. If your bank compounds daily (the most common method), you earn a tiny bit of interest each day, and tomorrow you earn interest on that interest too. Over months and years, compounding makes your balance grow faster than straightforward math suggests. A $5,000 deposit at 4.5% APY compounds to roughly $5,230 after one year, not $5,225, because of daily compounding.

Key Takeaways

  • Your interest earnings equal the APY rate multiplied by your account balance, though the exact amount depends on how often the bank compounds interest.
  • Banks set APY rates and change them without notice, so the rate you see today may be different in three months.
  • Online banks typically offer higher APY than brick-and-mortar banks because they have lower operating costs.
  • Interest compounds daily at most banks, meaning you earn returns on your returns, which accelerates growth over time.
  • The money you earn is taxable income, and your bank will report it to the IRS if the total exceeds a certain threshold.

How banks decide what rate to offer

Banks do not set savings rates in isolation. They follow the federal funds rate, which the Federal Reserve (the central bank of the United States) adjusts several times per year. When the Fed raises its rate, banks gradually raise the APY they offer on savings accounts. When the Fed lowers its rate, banks lower APY. The relationship is not one-to-one — a bank might raise its rate by 0.25% when the Fed moves by 0.25%, or it might move by less, or wait weeks before moving at all.

Online banks tend to offer higher APY than traditional banks because they operate with fewer physical branches and lower overhead costs. They pass some of that savings to customers through better rates. A brick-and-mortar bank might offer 0.01% APY while an online bank offers 4.5% APY on the same type of account. The trade-off is that online banks have no teller, no local branch, and no in-person service — everything happens by phone, email, or website.

Banks also offer different rates for different account types. A money market account might pay more than a basic savings account. A certificate of deposit (CD) — where you agree to leave money untouched for a set period — often pays more than either. The longer you commit to leaving the money alone, the higher the rate usually is.

What happens to your rate over time

The APY your bank advertises today is not may provide to stay the same. Banks can lower rates at any time without asking permission. They must notify you before the change takes effect, usually by email or mail, but they do not need your consent. If your bank lowers its rate from 4.5% to 3.0%, your earnings drop when ready on any new deposits and on the balance going forward.

Some banks raise rates to attract new customers, then lower them after a few months. Others keep rates stable for long periods. There is no rule about how often a bank can change its rate. If you want to lock in a higher rate, a CD is one option — the rate stays fixed for the term you choose, whether that is three months, one year, or five years. The downside is that you cannot withdraw the money early without paying a penalty.

How to calculate what you will earn

The simplest way to estimate your earnings is to multiply your balance by the APY and divide by 12 for a monthly estimate. A $10,000 balance at 4.5% APY earns roughly $37.50 per month ($450 per year ÷ 12). This is approximate because compounding happens daily, not monthly, but it gives you a ballpark figure.

Most banks show your interest earnings in your monthly statement or online account dashboard. You can see exactly how much you earned that month and what your new balance is. Some banks also provide a calculator on their website where you enter your balance and the APY, and it shows you projected earnings over different time periods.

If you want to compare two banks, use their stated APY to calculate earnings on the same balance at each bank. A $25,000 balance at 4.5% APY earns $1,125 per year. The same balance at 3.0% APY earns $750 per year. The difference is $375 — real money that stays in your pocket if you choose the higher-rate bank.

Why your actual earnings might differ from the advertised rate

The APY assumes your balance stays the same all year. If you deposit money partway through the year, you earn interest only on the amount you actually held for the time you held it. A $10,000 deposit made on July 1 at 4.5% APY earns roughly $225 for the remaining six months of the year, not $450.

Some banks offer promotional rates that explore only to new customers or only for a limited time. A bank might advertise 5.0% APY for the first three months, then drop to 3.5% after that. Read the fine print to understand when the rate changes and what the regular rate will be.

Fees can also reduce your earnings. If your bank charges a monthly maintenance fee of $5, and you earn $10 in interest that month, your net gain is $5. Some banks waive fees if you maintain a minimum balance or set up direct deposit, so the fee structure matters when comparing banks.

Tax implications of savings account interest

Interest you earn in a savings account is taxable income. If you earn $500 in interest during the year, that $500 counts as income on your tax return. Your bank will send you a form called a 1099-INT if your interest earnings exceed $10 in a calendar year. You use this form when you file taxes.

The tax you owe depends on your overall income and tax bracket. Someone in a higher tax bracket pays a higher percentage on that interest income than someone in a lower bracket. This is one reason some people move money to tax-advantaged accounts like Roth IRAs or Health Savings Accounts (HSAs) if they have them — interest earned in those accounts is not taxed the same way.

Comparing savings accounts to other places for your money

A savings account is one place to keep money you might need soon. A money market account often pays slightly more APY but may require a higher minimum balance. A CD pays more but locks your money away. A high-yield savings account (offered by online banks) pays significantly more than a traditional savings account but offers no check-writing or debit card.

If you have money you will not need for several years, a CD ladder — buying multiple CDs with different maturity dates — can lock in higher rates while giving you access to some money each year. If you need the money within a few months, a savings account or money market account is more practical because you can withdraw without penalty.

Frequently Asked Questions

Can I earn more interest by moving my money to a different bank?

Yes. If your current bank offers 0.5% APY and another bank offers 4.5% APY, moving your balance to the higher-rate bank means you earn nine times as much interest annually. The process takes a few days, and you can usually transfer money electronically without closing your old account.

What is the difference between APY and APR?

APY (Annual Percentage Yield) includes compounding and shows what you actually earn. APR (Annual Percentage Rate) does not include compounding and is typically used for loans, not savings. For savings accounts, always look at the APY, not the APR.

Does my interest earnings count as income for government benefits?

It depends on the benefit program. Some programs count interest as income and may reduce your benefit amount if you earn above a threshold. Others do not. Contact the program administrator directly to ask how interest earnings affect your status.

Why do some banks offer 0% interest on savings accounts?

Banks that offer very low rates are usually traditional brick-and-mortar banks with high operating costs. They rely on customer loyalty, convenience, and other services rather than competitive interest rates. Online banks compete primarily on rate, so they offer higher APY.

If I withdraw money before the end of the year, do I lose the interest I earned?

No. Interest you earned stays yours. You earn interest on a daily basis, so if you withdraw on June 15, you keep all interest earned from January 1 through June 15. You straightforward stop earning interest on the withdrawn amount after that date.