What determines how much your savings account earns

Your savings account earnings depend on three things: the interest rate your bank offers, how much money you keep in the account, and how long it stays there. The interest rate is the percentage of your balance the bank pays you each year. A bank offering 4.5% annual interest will pay you more than one offering 0.01% — the difference can be hundreds of dollars per year on the same deposit.

Interest rates change constantly and vary widely between banks. Online banks typically offer higher rates than brick-and-mortar banks because their overhead costs are lower. Credit unions sometimes offer competitive rates too. The rate you see advertised today may be different next month, and your bank can lower the rate on your account with notice (usually 30 days).

The second factor is your balance. If you have $1,000 earning 4.5% annually, you'll earn about $45 per year. If you have $10,000 at the same rate, you'll earn about $450. The math is straightforward: multiply your balance by the annual interest rate.

Key Takeaways

  • Your earnings equal your account balance multiplied by the annual interest rate — a $5,000 balance at 4.5% earns roughly $225 per year.
  • Online banks and credit unions typically offer rates between 4% and 5.5%, while traditional banks often offer less than 1%.
  • Interest rates change monthly, and your bank can lower your rate with 30 days' notice, so check your rate periodically.
  • Some accounts compound interest daily, which means you earn small amounts of interest on your interest, though the difference is usually modest on savings accounts.
  • High-yield savings accounts and money market accounts usually pay more than regular savings accounts at the same bank.

How to calculate your annual earnings

The basic formula is: Balance × Annual Interest Rate = Annual Earnings. If you have $2,500 in an account earning 4.25% per year, multiply $2,500 by 0.0425 to get $106.25 in annual earnings.

Most banks compound interest daily or monthly, which means you earn interest on your interest. With daily compounding, you earn a tiny bit more than the simple calculation shows, but the difference is usually small — on a $2,500 balance at 4.25%, daily compounding might add $1 to $2 per year compared to annual compounding. Your bank's website or account agreement will state how often interest compounds.

If your balance changes during the year, your earnings will be lower. If you deposit $5,000 in January and withdraw $2,000 in June, you won't earn the full year's interest on $5,000. Banks calculate this by using your average daily balance or your ending balance, depending on their method — check your account agreement to see which applies to you.

Why rates vary so much between banks

Online banks pay higher rates because they have lower costs. They don't maintain physical branches, employ as many staff, or spend money on building maintenance. They pass those savings to customers through higher interest rates. A bank offering 4.75% online might offer 0.15% at a physical branch in the same city.

Credit unions are member-owned and often return profits to members through better rates and lower fees. If you're a member of a credit union, compare their savings rate to online banks — you might find competitive rates without switching.

Large national banks often offer the lowest rates because they have high overhead costs and don't need to compete aggressively for deposits — many customers stay with them for convenience or habit. Smaller regional banks fall somewhere in between.

Where to find current rates and compare banks

Your current bank's website shows your account's interest rate in the account details or terms section. If you can't find it, call customer service and ask for your annual percentage yield (APY) — that's the standard term banks use.

To compare rates across banks, visit sites like Bankrate, DepositAccounts, or NerdWallet, which list current rates from dozens of banks and credit unions. These sites update rates frequently because they change often. When you find a bank with a rate you like, visit that bank's website directly to confirm the rate before opening an account — third-party sites can lag by a day or two.

Pay attention to the difference between APY (annual percentage yield, which includes compounding) and APR (annual percentage rate, which does not). Banks advertising savings accounts will show APY, which is the number that matters for your earnings calculation.

How inflation affects what your savings actually buys

Interest earnings are only part of the picture. Inflation — the rising cost of goods and services over time — erodes the purchasing power of your money. If inflation is running at 3% per year and your savings account earns 4.5%, your money is growing faster than prices are rising, so you're gaining ground. If inflation is 5% and your account earns 2%, you're losing purchasing power even though the balance is growing.

During high-inflation periods, a savings account earning 2% might feel like a loss. During low-inflation periods, the same 2% rate protects your money's value. This is why comparing your interest rate to the current inflation rate gives you a clearer picture of whether your savings are truly growing or shrinking in real terms.

Savings accounts versus other places to put money

Savings accounts are safe and liquid — you can withdraw your money quickly without penalty. Money market accounts often pay slightly higher rates than savings accounts but may require a larger minimum balance. Certificates of deposit (CDs) typically pay more than both, but you lock your money away for a set period (3 months to 5 years) and face a penalty if you withdraw early.

If you need the money within the next year or two, a high-yield savings account is usually the best choice because the rate is competitive and your money stays accessible. If you won't need the money for several years, a CD might earn you more, but only if the higher rate justifies locking up your cash.

Treasury bonds and bond funds can pay more than savings accounts, but they carry different risks and are less liquid. For money you might need to access, a savings account remains the simplest option.

What to do if your bank's rate drops

Banks can lower your interest rate with notice, usually 30 days. When this happens, you'll receive a notice by mail or email. You have options: stay with your current bank, move your money to a bank offering a better rate, or split your balance between accounts at different banks.

Moving money between banks is straightforward. Open an account at the new bank, then request an external transfer from your old bank to your new one. Most banks process this within 3 to 5 business days. You don't need to close your old account immediately — you can leave it open if it has no monthly fee, or close it once the transfer is complete.

If you have more than $250,000, split your deposits across multiple banks or credit unions. The Federal Deposit Insurance Corporation (FDIC) insures up to $250,000 per depositor per bank, so amounts above that are not protected if the bank fails.

Frequently Asked Questions

How often do banks pay interest into my account?

Most banks deposit interest monthly, though some do it quarterly or annually. Check your account agreement or call your bank to confirm. The frequency doesn't change your annual earnings — you'll get the same total amount whether it arrives in 12 monthly deposits or 4 quarterly ones.

Do I have to pay taxes on savings account interest?

Yes. Interest earnings are taxable income. Your bank will send you a 1099-INT form at tax time if you earned $10 or more in interest during the year. You report this on your tax return. The tax rate depends on your overall income and tax bracket.

What's the difference between APY and APR?

APY (annual percentage yield) includes the effect of compounding — interest earned on your interest. APR (annual percentage rate) does not. For savings accounts, APY is the number that matters because it shows your actual earnings. Banks advertising savings rates always show APY.

Can I lose money in a savings account?

Your balance won't go down from interest calculations or normal account activity. However, if you withdraw more than you deposit, your balance decreases. Overdraft fees can also reduce your balance if you spend more than you have. Your deposits are insured up to $250,000 by the FDIC, so the bank cannot lose your money.

Is a high-yield savings account the same as a regular savings account?

Both are savings accounts insured by the FDIC, but high-yield accounts pay significantly more interest — often 4% to 5.5% compared to 0.01% to 0.5% at traditional banks. High-yield accounts are usually offered by online banks. The tradeoff is less convenience (no physical branch) for better earnings.