What you earn depends on the bank's rate, how much you deposit, and how long money sits there

The amount of interest you earn in a savings account is calculated by multiplying your balance by the annual percentage yield (APY) the bank offers, then dividing by 365 days. If you keep $10,000 in an account paying 4.5% APY for a full year, you earn roughly $450 before taxes. If you keep it for six months, you earn about $225. The actual number changes daily because most banks compound interest — they add earned interest back into your balance, and then calculate interest on that larger amount the next period.

The rate itself varies wildly by bank and account type. A traditional savings account at a major bank might pay 0.01% APY right now, which means $10,000 earns $1 per year. A high-yield savings account at an online bank might pay 4.5% to 5.3% APY, earning $450 to $530 on the same $10,000. The difference is real money, not a rounding error. Where you bank matters more than how much you deposit.

Interest accrues daily at most banks but posts to your account monthly or quarterly. You do not see the money appear every single day — it accumulates in the background and shows up as a lump deposit on a schedule the bank sets. If you withdraw money before interest posts, you lose the accrued amount for that period.

Key Takeaways

  • Interest earned equals your balance multiplied by the APY, divided by 365 — a $10,000 balance at 4.5% APY earns roughly $450 per year.
  • High-yield savings accounts at online banks currently pay 4.5% to 5.3% APY, while traditional bank savings accounts often pay 0.01% to 0.05% APY.
  • Most banks compound interest daily but post it monthly or quarterly, so you do not see earnings appear every day.
  • Withdrawing money before interest posts means you forfeit accrued interest for that period, so timing matters if you plan to move funds.

How compounding multiplies your earnings over time

Compounding means the bank calculates interest on your original balance plus all the interest you have already earned. On day one, you earn interest on $10,000. On day two, you earn interest on $10,000 plus the tiny amount from day one. By month two, you are earning interest on a slightly larger balance. Over years, this effect becomes visible.

A $10,000 deposit at 4.5% APY with daily compounding grows to $10,460 after one year. Without compounding — if the bank just paid you $450 once at the end — you would have $10,450. The difference is $10. That sounds small, but over five years the same deposit grows to $12,462 with daily compounding versus $12,250 without it. Compounding adds $212 to your balance. The longer money sits and the higher the rate, the more compounding matters.

Most savings accounts compound daily, which is the most frequent schedule. Some older accounts or smaller banks compound monthly or quarterly. Daily compounding is always better than less frequent compounding at the same APY, though the difference is usually small — a few dollars per year on typical balances.

Why rates change and how to track what your bank pays

Banks set their own rates based on what the Federal Reserve does. When the Fed raises its benchmark rate, banks usually raise savings rates within weeks. When the Fed cuts rates, banks cut savings rates more slowly — sometimes taking months. This lag means the best time to lock in a high rate is right after the Fed raises rates, before banks adjust downward.

Your bank's rate can change at any time, and the bank is required to notify you before the change takes effect. You will receive notice by email, mail, or through your online banking portal. The notice usually comes a few days before the new rate starts. You do not have to do anything — the new rate applies automatically to your account.

To find out what rate you are earning right now, log into your online banking account or call your bank's customer service line. The rate should appear on your account statement or in the account details section of your bank's website. If you cannot find it, ask. Banks are required to disclose the APY clearly. If your bank is paying less than 0.5% APY on savings, you are likely losing money to inflation — the purchasing power of your balance shrinks each year.

The difference between APY and APR in savings accounts

APY (annual percentage yield) is what matters for savings accounts. It includes the effect of compounding and tells you the real return you will earn over one year. APR (annual percentage rate) does not include compounding and is used mainly for loans and credit cards, not savings.

A bank might advertise an APR of 4.4% on savings, but if compounding is daily, the actual APY is 4.5%. The difference comes from compounding — the APY is always higher than the APR on savings accounts. When comparing banks, always look at the APY, not the APR. The APY is the number that tells you what you actually earn.

How taxes reduce what you keep from interest earnings

Interest you earn in a savings account is taxable income. If you earn $450 in interest over a year, the bank reports that to the IRS on a 1099-INT form, and you owe federal income tax on it. The tax rate depends on your total income and tax bracket — it could be 10%, 22%, 24%, or higher. State income tax may apply too, depending on where you live.

If you earned $450 in interest and your tax bracket is 24%, you owe roughly $108 in federal tax on that interest. Your actual take-home is $342, not $450. This is why the difference between a 0.01% account and a 4.5% account is so large — the higher rate gives you more interest to keep even after taxes.

Banks do not withhold tax from interest earnings automatically. You are responsible for reporting it when you file your tax return. If you earn more than $10 in interest during the year, the bank will send you a 1099-INT form by January 31 of the following year. Keep that form with your tax records.

When interest stops accruing and what happens to dormant accounts

Interest accrues as long as your account is open and active. If you stop making deposits or withdrawals for a long time, the account does not close automatically — interest keeps accruing. However, some banks declare accounts dormant or unclaimed after a period of inactivity, usually three to five years. Once an account is declared dormant, the bank may stop paying interest and may charge monthly fees.

If your account is declared dormant, the bank is required by state law to turn the funds over to the state's unclaimed property program. You can still recover the money — it does not disappear — but you have to contact your state's unclaimed property office or the bank to claim it. The process can take weeks. To avoid this, make at least one transaction per year: a small deposit, withdrawal, or even a balance inquiry counts as activity at some banks.

Comparing earnings across different account types and terms

Savings accounts are not the only place to earn interest. Money market accounts often pay the same rate as high-yield savings but require a higher minimum balance. Certificates of deposit (CDs) lock your money away for a set term — three months, six months, one year, five years — and pay a higher rate in exchange. A one-year CD might pay 5.0% APY while a savings account pays 4.5% APY.

The trade-off is access. If you withdraw from a CD before the term ends, you pay an early withdrawal penalty — usually three to six months of interest. If you need the money in six months but buy a one-year CD, you lose money. Savings accounts have no withdrawal limits or penalties, so you earn less but keep more flexibility.

Treasury bills and bonds issued by the U.S. government also pay interest and are considered very safe, but they work differently than bank accounts. A four-week Treasury bill pays a fixed rate set at auction, and you get your money back after four weeks. A one-year Treasury note pays a fixed rate and matures after one year. These are not bank products, and interest is taxed differently — federal tax applies but state tax does not.

Frequently Asked Questions

Do I earn interest on interest in a savings account?

Yes, through compounding. The bank calculates interest on your original balance plus all previously earned interest. Over time, this means you earn interest on interest, which accelerates growth. Daily compounding is most common and produces the highest returns.

What is the highest interest rate a savings account can pay right now?

High-yield savings accounts at online banks currently pay between 4.5% and 5.3% APY, though rates change frequently based on Federal Reserve decisions. Rates vary by bank and can change without notice, so check your bank's website or call to confirm the current rate before opening an account.

Can I lose money in a savings account?

You cannot lose the principal you deposit — FDIC insurance protects up to $250,000 per account holder per bank. However, if inflation is higher than your interest rate, your purchasing power shrinks. If you earn 0.5% interest but inflation is 3%, your money buys less each year even though the dollar amount stays the same.

How often does interest post to my account?

Interest accrues daily at most banks but posts monthly or quarterly depending on the bank's schedule. You do not see the money appear every day — it accumulates in the background and shows up as a single deposit on the posting date. Check your account statement to see when your bank posts interest.

What happens to interest if I close my savings account?

You receive all accrued interest up to the closing date. If interest has not posted yet, the bank calculates and pays it when you close. You will receive the principal plus any earned interest as a check or transfer to another account, depending on how you close it.