What you earn from a savings account depends on the interest rate and how much you keep in it

A savings account earns money through interest—a percentage of your balance that the bank pays you for letting them use your money. The amount you make is calculated by multiplying your account balance by the interest rate, then dividing by the number of days in a year. If you have $10,000 in an account earning 4.5% annual interest, you would earn roughly $450 per year, or about $37.50 per month, though the actual monthly amount depends on how many days are in that month and whether interest compounds daily or monthly.

The catch is that interest rates vary widely. A traditional savings account at a large bank might pay 0.01% to 0.05% annually, meaning $10,000 would earn $1 to $5 per year. A high-yield savings account at an online bank might pay 4% to 5.35%, earning $400 to $535 on the same $10,000. The difference between these two is real money, and it compounds over time.

Your earnings also depend on how long the money sits in the account and whether you add to it or withdraw from it. Interest is typically calculated on your daily balance, so money you deposit mid-month earns less that month than money that was there the whole time. If you withdraw money, you lose the interest you would have earned on that amount going forward.

Key Takeaways

  • Interest earnings are calculated by multiplying your balance by the annual interest rate; a $10,000 balance at 4.5% earns roughly $450 per year.
  • High-yield savings accounts pay 4% to 5.35% annually, while traditional bank savings accounts typically pay 0.01% to 0.05%.
  • Interest compounds daily or monthly depending on the account, meaning you earn interest on your interest, though the effect is small on most balances.
  • The longer money stays in the account untouched, the more interest it earns, because interest is calculated on your daily balance.
  • Interest rates change over time and vary by bank, so the amount you earn this year may differ from next year.

How interest rates are set and why they change

Banks set their own savings account interest rates based on what the Federal Reserve does with its benchmark rate. When the Fed raises rates, banks typically raise savings rates within weeks or months. When the Fed cuts rates, banks cut savings rates faster. This means the 4.5% you earn today might drop to 3.5% in six months if the Fed signals a rate cut is coming.

Online banks tend to offer higher rates than brick-and-mortar banks because they have lower overhead costs—no branches, fewer employees, cheaper rent. They pass some of that savings to customers through higher interest rates. Traditional banks offer lower rates partly because they spend more to operate physical locations, but also because they rely on customer loyalty and convenience rather than competing on rate alone.

Interest rates are also tied to economic conditions. During periods of high inflation, the Fed raises rates to cool spending, and savings rates rise. During recessions or periods of low inflation, rates fall. This means the best time to lock in high savings rates is when the Fed is raising rates; the worst time is when it is cutting them.

The difference between simple and compound interest

Most savings accounts use compound interest, which means you earn interest on your interest. If your account compounds daily, the bank calculates interest each day on your balance plus any interest already earned. Over a year, this compounds to slightly more than simple interest would pay.

The math: if you have $10,000 at 4.5% compounded daily, you earn about $460 over a year instead of $450. The difference is small on typical balances, but it grows larger the longer the money sits and the higher the rate. On $100,000 at 4.5% compounded daily, you earn about $4,600 instead of $4,500—a $100 difference. On $1 million, the difference is roughly $1,000.

Some older savings accounts compound monthly or quarterly instead of daily. Daily compounding is better for you because interest accrues more often. When comparing accounts, look for "daily compounding" in the terms, though most modern accounts offer it as standard.

How to calculate what you will earn in a specific time period

To estimate your earnings, use this formula: (Balance × Annual Interest Rate) ÷ 365 × Number of Days. If you have $5,000 at 4% and want to know what you earn in three months (roughly 90 days), the math is: ($5,000 × 0.04) ÷ 365 × 90 = $49.32.

This is an estimate because actual interest depends on your exact daily balance throughout the period. If you deposit $2,000 on day 45, your balance changes mid-period and the calculation shifts. Banks calculate this automatically, so you do not have to do it yourself—but knowing the formula helps you understand whether a rate is worth switching banks for.

Many banks and financial websites offer savings calculators that do this math for you. You enter your balance, the interest rate, and the time period, and the calculator shows you the total interest earned. These are useful for comparing accounts or planning how long it takes to reach a savings goal.

Why your earnings might be lower than expected

Interest is taxed as ordinary income by the IRS. If you earn $500 in interest, you owe federal income tax on that $500 at your regular tax rate. If you are in the 22% tax bracket, you owe $110 in taxes, leaving you with $390 in actual earnings. State income tax may apply too, depending on where you live. This means your real after-tax earnings are lower than the interest rate suggests.

Banks report interest earnings to the IRS on a Form 1099-INT if you earn $10 or more in a calendar year. You receive a copy and must report it on your tax return. Some banks send the form in January; others send it later. Keep track of your interest earnings throughout the year so you are not surprised at tax time.

You also earn less if you withdraw money before the end of a compounding period. Some accounts calculate interest daily, so withdrawals have minimal impact. Others calculate monthly or quarterly, and a withdrawal mid-period can cost you interest on that amount for the rest of the period. Check your account terms to understand how withdrawals affect your earnings.

Comparing earnings across different account types

A traditional savings account at a large bank earning 0.05% on $10,000 generates $5 per year. A high-yield savings account at an online bank earning 4.5% on the same $10,000 generates $450 per year. Over five years, that is $25 versus $2,250—a difference of $2,225. This is why the choice of account matters, especially if you are saving a larger amount or for a longer time.

Money market accounts often pay rates similar to high-yield savings accounts but may require a higher minimum balance—sometimes $2,500 or $10,000. Certificates of deposit (CDs) typically pay higher rates than savings accounts, but your money is locked up for a set term, usually three months to five years. If you withdraw early, you pay a penalty that can wipe out your interest earnings.

The tradeoff is access versus rate. A high-yield savings account lets you withdraw money anytime without penalty, but the rate may be lower than a CD. A CD locks in a higher rate but restricts access. For money you do not need immediately, a CD might earn more. For an emergency fund, a high-yield savings account is usually the better choice because you can access the money if you need it.

What happens to your earnings if rates drop

If you are earning 4.5% and the Fed cuts rates, your bank will likely cut your rate too—sometimes within days. Your earnings drop immediately. A $10,000 balance earning $450 per year at 4.5% might earn only $300 per year at 3% if rates fall. This is why it is important to monitor your rate and shop around if it drops significantly.

Some banks lower rates faster than others. Online banks that compete on rate tend to cut rates quickly when the Fed moves. Traditional banks sometimes lag, giving you a window to move money to a higher-paying account before they cut. If you notice your rate has dropped, check what other banks are offering and consider switching if the difference is substantial.

Conversely, if rates rise, your bank may not raise your rate immediately. They benefit from the gap between what they pay you and what they earn on loans. You can push back by threatening to move your money, or you can simply switch to a bank offering a higher rate. Banks know this, which is why competitive banks raise rates quickly when the Fed moves up.

Frequently Asked Questions

How often does interest get added to my account?

Interest is calculated daily at most banks but posted to your account monthly. This means interest accrues every day but you see it added once a month, usually on the last day of the month or the first day of the next month. Some banks post interest quarterly or even annually, so check your account terms.

Do I have to pay taxes on savings account interest?

Yes, interest is taxed as ordinary income. If you earn $10 or more in a year, the bank sends you a Form 1099-INT and reports it to the IRS. You must report this on your tax return and pay federal income tax on it at your regular rate. State income tax may apply depending on your state.

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

Rates change frequently and vary by bank. High-yield savings accounts currently range from about 4% to 5.35%, but this depends on the bank and changes as the Fed adjusts its benchmark rate. Check current rates on banking comparison websites or directly with banks to see what is available.

Can I lose money in a savings account?

No, savings accounts are FDIC insured up to $250,000 per depositor per bank, so your principal is protected. You cannot lose the money you deposit. However, if inflation is higher than your interest rate, your money loses purchasing power—meaning it buys less over time—even though the account balance stays the same.

Is it better to keep money in a savings account or invest it?

Savings accounts are safe and liquid but earn modest returns. Investments like stocks or bonds can earn more over time but carry risk and may not be accessible immediately. The right choice depends on your time horizon, risk tolerance, and whether you need the money soon. Money you need within a few years usually belongs in savings; money you will not touch for 10+ years might belong in investments.