What your savings account earns depends on the bank, the account type, and the current rate environment

The amount of interest your savings account earns is determined by three things: the annual percentage yield (APY) the bank offers, how much money you have in the account, and how long it stays there. A bank offering 4.5% APY on a savings account will pay you roughly $45 per year on a $1,000 balance, though the exact amount depends on how often the bank compounds interest (daily, monthly, or quarterly). Banks set their own rates and change them frequently—sometimes weekly—so the rate you see today may not be the rate you earn next month.

The rate you receive also depends on the account type. A standard savings account typically earns less than a money market account or a certificate of deposit (CD) at the same bank. Some banks offer tiered rates, meaning you earn a higher percentage on balances above a certain threshold. Others offer promotional rates for new customers that drop after a set period. Your job is to find out what rate your specific bank is currently paying on your specific account type, then decide whether that rate is worth staying for.

Key Takeaways

  • Your interest earnings equal your account balance multiplied by the APY, divided by 365 days, then multiplied by the number of days your money sits in the account.
  • Banks change rates frequently and independently, so the rate you earn today may be different from the rate you earn in three months.
  • Money market accounts and CDs usually pay more than standard savings accounts, but money market accounts may have withdrawal limits and CDs lock your money away for a set term.
  • Online banks typically offer higher rates than brick-and-mortar banks because they have lower overhead costs.
  • Interest compounds at different frequencies (daily, monthly, quarterly), so two accounts with the same APY may earn slightly different amounts depending on compounding schedule.

How to calculate what you will actually earn

The formula is straightforward: take your account balance, multiply it by the APY as a decimal, then multiply by the fraction of the year your money was in the account. If you keep $5,000 in an account earning 4.5% APY for the full year, you earn $225. If you keep it there for six months, you earn roughly $112.50. If you deposit $5,000 on July 1 and leave it until December 31, you earn about $112.50 (six months of the year).

The catch is that most banks compound interest daily or monthly, meaning they calculate and add interest to your balance on a schedule, and then your next interest payment is calculated on that larger balance. This is why the exact amount you earn is slightly higher than a simple multiplication. A bank that compounds daily will pay you marginally more than one that compounds monthly, even at the same APY. You can find the compounding frequency in your account's terms and conditions or by calling the bank directly.

Some banks publish an Annual Percentage Yield (APY) that already accounts for compounding, so you can compare rates directly without doing the math yourself. If a bank shows you 4.5% APY, that is the actual return you will receive over a year, assuming the rate does not change.

Why rates vary between banks and account types

Online banks almost always pay more than traditional brick-and-mortar banks on savings accounts. An online bank with no physical branches has lower overhead—no rent, no tellers, no branch managers—so it can pass those savings to customers in the form of higher rates. A major national bank with thousands of branches may offer 0.01% APY on a savings account, while an online bank offers 4.5% on the same account type. The money is equally safe at both (both are FDIC-insured up to $250,000), but the online bank's lower costs mean higher rates for you.

Account type also matters. A standard savings account is designed for money you might need to access quickly, so banks pay less interest. A CD requires you to lock your money away for a set term—three months, six months, one year, five years—and in exchange, the bank pays a higher rate because it knows exactly how long it can use your money. A money market account sits in the middle: it usually pays more than a savings account but less than a CD, and it may allow a limited number of withdrawals per month.

Promotional rates are another factor. A bank may offer 5.0% APY for the first three months to attract new customers, then drop the rate to 0.5% after that. Read the fine print before opening an account to understand when and how the rate changes.

How to find your current rate and track changes

Log into your bank's website or app and look for your account details or account summary. The APY should be listed there, along with the current balance and any recent interest deposits. If you cannot find it online, call your bank's customer service line and ask for the current APY on your specific account. Write down the date you asked, because rates change and you will want to know when yours changed.

Set a reminder to check your rate every three months. Banks do not always notify customers when rates drop, so you may not notice until you compare your earnings to what you expected. If your rate drops significantly and other banks are offering more, you can move your money. There is no penalty for closing a savings account or moving funds to another bank (though CDs may have early withdrawal penalties if you cash out before the term ends).

Some banks publish their rate history on their website, showing what they paid in previous months or years. This can help you understand whether the current rate is typical for that bank or unusually high or low. If you see a pattern of rates dropping after promotional periods, you know what to expect.

The difference between APY and APR in savings accounts

APY (Annual Percentage Yield) is what you see on savings accounts, money market accounts, and CDs. It includes the effect of compounding, so it represents the actual return you will earn. APR (Annual Percentage Rate) is used for loans and credit cards, and it does not include compounding in the same way. For savings products, always look at the APY, not the APR.

Some banks may list both figures, but the APY is the one that matters for your earnings. If a bank shows you 4.5% APY and 4.4% APR on the same account, the APY is what you will actually earn.

What happens to your interest if you withdraw money early

If you withdraw money from a savings account or money market account before the end of a month or quarter, you typically lose the interest that would have been paid on that withdrawal for that period. Some banks calculate interest daily, so you earn interest up to the day you withdraw. Others calculate monthly, so if you withdraw on the 15th of the month, you may not earn interest for that entire month on the amount you withdrew.

CDs are different: if you withdraw money before the term ends, you pay an early withdrawal penalty, which is usually a set number of months' worth of interest. A one-year CD with a three-month penalty means you lose three months of interest if you cash out early. The penalty is deducted from your principal, so you may end up with less money than you deposited. Always read the CD's terms before opening one to understand the penalty.

How inflation affects what your interest actually buys

Interest earnings are only useful if they outpace inflation. If your savings account earns 2% APY but inflation is running at 3%, your money is losing purchasing power—you can buy less with it next year than you can today, even though the dollar amount in your account went up. This is why it matters to compare rates across banks and account types. A 4.5% APY savings account beats inflation in most years, but a 0.01% APY account does not.

You cannot control inflation, but you can control which bank you use and which account type you choose. Moving your money from a 0.01% account to a 4.5% account is one of the few financial moves that costs you nothing and pays you immediately.

Frequently Asked Questions

How often does interest get added to my account?

Most banks compound interest daily or monthly. Daily compounding means interest is calculated and added every day, though you may only see it posted to your balance once a month. Monthly compounding means interest is calculated and added once a month. The frequency is listed in your account's terms and conditions or on the bank's website. Daily compounding pays slightly more than monthly compounding at the same APY.

If I move my money to a different bank, do I lose the interest I already earned?

No. Interest that has already been added to your account balance is yours to keep. When you transfer money to another bank, you take that balance with you. You only lose future interest if you move the money before the next interest payment date and the new bank has a lower rate.

Can my bank lower my interest rate without telling me?

Yes. Banks are not required to notify you before lowering rates on savings accounts. They may send a notice, but many do not. This is why checking your rate every few months is important. If your rate drops and you find a better rate elsewhere, you can move your money.

What is the highest interest rate I can find on a savings account right now?

Rates change weekly and vary by bank, so there is no single "highest" rate. Online banks typically offer the highest rates on savings accounts, often in the 4% to 5% range, though this varies. Check comparison websites or call banks directly to see current rates. Rates were higher in 2023 and 2024 than they were in previous years, but they may change again.

Do I have to pay taxes on the interest I earn?

Yes. Interest earned in a savings account is taxable income. Your bank will send you a 1099-INT form at the end of the year if you earned $10 or more in interest, and you report that amount on your tax return. The interest is taxed at your ordinary income tax rate, not at a special rate.