What you earn depends on the bank's rate and how much you have saved

A savings account earns interest by paying you a percentage of the money you keep in it. The amount you receive each month or year depends on two things: the annual percentage yield (APY) the bank offers, and your account balance. A bank offering 4.5% APY on $10,000 will pay you roughly $450 per year, paid in small deposits spread across months. A bank offering 0.01% APY on the same $10,000 will pay you about $1 per year.

The gap between these two scenarios is real and matters. Where you keep your money determines whether your savings grow or barely move. Most brick-and-mortar banks currently offer between 0.01% and 0.05% APY. Online banks and credit unions often offer between 4% and 5.5% APY. The difference compounds over time—money in a high-yield account grows noticeably faster than money in a standard account.

Key Takeaways

  • Your earnings equal your balance multiplied by the APY, divided by 12 for monthly deposits (though the exact calculation compounds daily in most accounts).
  • Online banks typically pay 4% to 5.5% APY, while traditional banks pay closer to 0.01% to 0.05% APY on the same deposit.
  • Interest rates change frequently and vary by bank, so the rate you see today may be different in three months.
  • Money market accounts and certificates of deposit sometimes pay higher rates than savings accounts, but require different access or commitment terms.

How the math actually works

Banks calculate interest using your daily balance and compound it daily, meaning you earn interest on your interest. The formula is straightforward: take your balance, multiply it by the APY, and divide by 365 (or 360, depending on the bank). That gives you the interest earned that day. The next day, your balance is slightly higher, so you earn slightly more interest on the new total.

Over a year, this compounding adds up. On $10,000 at 4.5% APY, you earn roughly $450 in year one. In year two, if you don't touch the money, you earn interest on $10,450, which is about $470. The difference is small in the first year but grows larger the longer money sits.

Most banks show you the interest earned in your monthly statement. You can also calculate it yourself: multiply your average daily balance by the APY and divide by 12 for a rough monthly estimate. The exact number will vary slightly because interest compounds daily, but this gives you a usable picture.

Why rates vary so much between banks

Online banks pay more because they have lower overhead costs. They don't maintain physical branches, employ tellers, or pay for building leases. Those savings get passed to customers as higher interest rates. Traditional banks with branch networks have higher costs and pass less of their earnings back to depositors.

Credit unions sometimes pay higher rates than both, because they're member-owned rather than shareholder-owned. Profits go back to members instead of investors, which can mean better rates on savings and lower fees overall. However, credit unions have membership requirements—you typically need to live or work in a specific area or belong to a particular group.

Banks also adjust rates based on what the Federal Reserve does. When the Fed raises its benchmark rate, banks usually raise savings rates within days or weeks. When the Fed cuts rates, banks cut savings rates more slowly. This lag means the best time to move money into a high-yield account is right after the Fed raises rates.

How much you actually receive each month

The monthly deposit is small enough that many people don't notice it. On $5,000 at 4.5% APY, you earn about $18.75 per month. On $1,000 at 4.5% APY, you earn about $3.75 per month. On $50,000 at 4.5% APY, you earn about $187.50 per month.

The deposits appear in your account automatically—you don't have to do anything. Most banks add interest on the last day of the month or the first day of the next month. Some add it daily but show the total monthly. Check your statement to see when your bank deposits interest and how much you received last month.

These amounts seem small because they are small compared to a paycheck. But over years, they add up. $187.50 per month is $2,250 per year, or $22,500 over a decade, earned on money you were already keeping in the account anyway.

Rates change, sometimes quickly

The APY your bank advertises today may not be the rate you earn next month. Banks change rates frequently, especially when the Federal Reserve moves. Some banks raise rates within days of a Fed increase. Others take weeks. A few raise rates slowly or not at all, hoping customers don't notice.

You can move your money to a different bank if your current bank's rate falls too far behind. There's no penalty for moving savings accounts—you straightforward open a new account elsewhere and transfer the balance. Some online banks offer sign-up bonuses of $50 to $500 if you move a large balance to them, though these bonuses come with conditions (usually a minimum balance and a holding period).

Check your bank's current rate every few months, especially after the Fed makes a move. If you're earning 0.5% APY and online banks are offering 4.5%, the difference is worth the 15 minutes it takes to open a new account and transfer money.

Money market accounts and CDs sometimes pay more

A money market account is a hybrid between a savings account and a checking account. It usually pays a higher interest rate than a regular savings account but limits how many withdrawals you can make per month. Some money market accounts pay 4.5% to 5.5% APY, similar to high-yield savings accounts. Others pay less. The trade-off is access—you can't write checks or use a debit card as freely.

A certificate of deposit (CD) locks your money away for a set period—typically three months to five years—in exchange for a higher rate. A one-year CD might pay 5% APY while a savings account pays 4.5%. The catch is that you can't touch the money without paying a penalty, usually a few months of interest. CDs make sense if you know you won't need the money for a specific period and want to may provide a rate that won't drop.

High-yield savings accounts are usually the best choice for money you might need soon. They pay nearly as much as CDs, have no withdrawal limits, and let you access your money when ready. CDs are better for money you're certain you won't touch for months or years.

Tax on interest earned

Interest you earn on a savings account is taxable income. If you earn $450 in interest in a year, you owe federal income tax on that $450, just as you would on a paycheck. Your bank will send you a 1099-INT form in January showing how much interest you earned the previous year.

The amount of tax you owe depends on your tax bracket. If you're in the 22% bracket, you'll owe roughly $99 in federal tax on that $450 in interest. State income tax may explore too, depending on where you live. This doesn't mean you shouldn't earn interest—it just means the net amount you keep is slightly less than the interest deposited.

Frequently Asked Questions

Is there a minimum balance to earn interest?

Most banks pay interest on any balance, even $1. However, some banks only pay interest if you maintain a minimum balance, often $500 or $1,000. A few banks pay higher rates only on balances above a certain threshold. Check your bank's terms to see whether a minimum applies to your account.

Can I lose money in a savings account?

No. Your principal—the money you deposit—is protected by FDIC insurance (at banks) or NCUA insurance (at credit unions) up to $250,000 per account. Interest rates can drop, but you won't lose the money itself. The only way to lose principal is to withdraw it yourself.

How often should I check rates and consider switching banks?

Check your bank's rate every three to six months, especially after the Federal Reserve makes a move. If your rate is more than 1% lower than what online banks are offering, switching is worth considering. The process takes about 15 minutes and costs nothing.

Do I have to pay fees that reduce my interest earnings?

Most online banks and credit unions charge no monthly fees on savings accounts. Some traditional banks charge $5 to $15 per month if you don't maintain a minimum balance. These fees can wipe out your interest earnings, so check your bank's fee schedule. If you're paying fees, moving to a bank with no fees is usually the better choice.

What's the difference between APY and APR?

APY (annual percentage yield) includes compounding and shows what you actually earn. APR (annual percentage rate) doesn't include compounding and is used mainly for loans. For savings accounts, always look at the APY, not the APR. The APY is what matters for your earnings.