What your bank pays you for holding money

A savings account interest rate is the percentage of your balance that your bank pays you each year for letting them hold your money. If you have $1,000 in a savings account with a 4.5% annual percentage yield (APY), the bank will pay you $45 over the course of a year — though the actual payment happens in smaller chunks, usually monthly or daily.

The bank pays you interest because they lend out the money you deposit to other customers. When someone takes out a mortgage or car loan, they pay the bank interest on that borrowed money. The bank keeps most of that interest but shares a portion with you as a reward for depositing your funds there. The rate you receive depends on what the bank decides to offer, what the Federal Reserve has set as its benchmark rate, and how much competition exists in your market.

Interest rates on savings accounts change over time. Your bank can raise or lower the rate it pays you whenever it wants, with no notice required in most cases. This means the 4.5% you earn today might drop to 3.8% next month if the bank decides to reduce its rates or if the Federal Reserve lowers its benchmark rate.

Key Takeaways

  • Banks pay you interest on savings as a percentage of your balance, calculated daily or monthly but often paid monthly or quarterly.
  • The rate your bank offers depends on Federal Reserve policy, market competition, and the bank's own business decisions — not on your account balance or how long you've been a customer.
  • Interest compounds, meaning you earn interest on your interest, so the longer money sits in the account, the more you accumulate.
  • Online banks typically offer higher rates than brick-and-mortar banks because they have lower operating costs.
  • Your bank can change your rate at any time, so rates advertised today may not be the rate you receive six months from now.

How interest gets calculated and added to your account

Banks calculate interest using one of two methods: simple interest or compound interest. Most savings accounts use compound interest, which means you earn interest on the interest you've already earned.

Here's how it works in practice. Suppose you have $10,000 at a 4% APY, compounded daily. The bank divides the annual rate by 365 days, giving it a daily rate of about 0.011%. Each day, it calculates interest on your current balance — including any interest added the day before — and adds that amount to your account. After 30 days, you might have $10,033. In month two, the bank calculates interest on $10,033, not just the original $10,000. Over a year, compounding means you earn slightly more than exactly 4% on your initial deposit.

The frequency of compounding matters. Interest compounded daily grows faster than interest compounded monthly, which grows faster than interest compounded quarterly. However, the difference is usually small — on a $10,000 balance at 4%, daily compounding versus monthly compounding might mean an extra $1 or $2 per year. Banks are required to disclose how often they compound interest, usually in the account terms or on the rate sheet.

Most banks credit interest to your account monthly, though some do it quarterly or even annually. The interest appears as a deposit in your account on a set day each month. You can then withdraw it, leave it to compound further, or transfer it elsewhere.

Why rates differ between banks and account types

Not all banks offer the same interest rate on savings accounts. Online banks — institutions with no physical branches — typically offer rates 10 to 20 times higher than traditional banks. A brick-and-mortar bank might offer 0.01% APY while an online bank offers 4.5% APY on the same type of account. The difference exists because online banks have far lower overhead costs. They don't maintain buildings, employ tellers, or run branch networks, so they can afford to pass more of their lending profits to depositors.

Banks also set different rates based on the type of account. A regular savings account usually earns less than a money market account, which earns less than a certificate of deposit (CD). CDs pay higher rates because you agree to leave your money untouched for a set period — three months, one year, five years. The longer the term, the higher the rate. In exchange for that higher rate, you pay a penalty if you withdraw the money early.

Account size can affect rates at some banks. A few institutions offer tiered rates, where larger balances earn higher percentages. However, most major banks now offer the same rate regardless of balance, so this is becoming less common.

How the Federal Reserve influences what your bank pays

The Federal Reserve sets a benchmark interest rate called the federal funds rate, which is the rate banks charge each other for overnight loans. This rate doesn't directly determine what your bank pays you, but it strongly influences it. When the Federal Reserve raises its benchmark rate, banks typically raise the rates they pay on savings accounts within weeks or months. When the Federal Reserve lowers its rate, banks usually lower savings rates as well.

The lag between a Federal Reserve change and a change to your account rate varies. Some online banks adjust rates within days of a Federal Reserve announcement. Traditional banks may take weeks or even months. Banks have no legal obligation to pass along Federal Reserve rate changes to savers, so some banks raise rates quickly when the Fed increases its benchmark but lower rates slowly when the Fed cuts — a practice that favors the bank over the depositor.

You can track Federal Reserve rate decisions through the Federal Reserve's official website or financial news outlets. When the Fed announces a rate change, it's a signal to shop around, because your current bank may not offer the best rate anymore.

What happens when interest rates fall

If you have money in a savings account and interest rates drop, your earnings decline. Your bank will lower the rate it pays you, usually within one to three months of a Federal Reserve rate cut. A savings account earning 4.5% might drop to 3.2%, then to 2.1% as rates fall across the industry.

This is why the rate you see advertised is not may provide. Banks advertise current rates to attract new customers, but those rates are subject to change. Your account agreement typically states that the bank can change your rate at any time with notice — often just 30 days' notice, sometimes less.

If rates fall significantly, you have options. You can move your money to a bank offering a higher rate, though you'll need to open a new account and transfer funds. You can move money into a CD to lock in a rate for a set period. Or you can accept the lower rate and keep your money where it is for convenience. There's no penalty for switching banks or moving money between savings accounts.

The difference between APY and APR on savings accounts

You'll see two terms on savings account disclosures: APY (annual percentage yield) and APR (annual percentage rate). For savings accounts, APY is the number that matters. APY includes the effect of compounding, so it shows you the actual amount you'll earn over a year. APR does not account for compounding and is typically used for loans, not savings.

If a bank advertises 4.5% APY on a savings account, that's the real return you'll receive if you leave your money untouched for a full year. If it advertised 4.5% APR without mentioning compounding, you'd earn slightly less because compounding isn't factored in. Banks are required to display APY prominently, so you should always see it clearly on rate sheets and account disclosures.

How to compare rates and find the best account for your situation

To find a savings account that pays you the most, start by checking rates at online banks, which almost always beat traditional banks. Websites like Bankrate, DepositAccounts, and the banks' own sites show current rates. Compare not just the headline rate but also the compounding frequency and any account requirements — some banks require a minimum balance or charge monthly fees that eat into your earnings.

Calculate what you'll actually earn. If you have $5,000 and a bank offers 4.5% APY, you'll earn roughly $225 per year (before taxes). If another bank offers 3.8%, you'll earn roughly $190 per year — a difference of $35. If you're keeping the money there for multiple years, that difference compounds and grows larger.

Consider your timeline. If you know you'll need the money in six months, a regular savings account is fine. If you won't touch it for two years, a CD might lock in a higher rate. If you might need it anytime, a high-yield savings account offers a middle ground — rates nearly as high as CDs but with no withdrawal penalties.

Remember that interest earned on savings accounts is taxable income. You'll receive a 1099-INT form at the end of the year showing how much interest you earned, and you'll owe federal income tax on that amount. Some states also tax interest income. This doesn't change which account to choose, but it's worth knowing that your actual take-home earnings will be lower than the interest amount.

Frequently Asked Questions

Can a bank lower my interest rate without telling me?

No. Banks must provide notice before lowering your rate, usually at least 30 days. However, the notice can come via email, mail, or a statement insert — you need to watch for it. Check your account statements and emails regularly, especially after Federal Reserve rate announcements, because rate changes often follow within weeks.

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

No. Interest that has already been added to your account is yours to keep. When you transfer money to a new bank, you take all of it — principal plus all interest earned to date. You only lose future interest if you close the account before the next interest payment date.

Why do some banks offer much higher rates than others?

Online banks have lower costs because they don't operate physical branches, so they can afford to pay depositors more. Traditional banks with many locations have higher overhead and typically offer lower rates. Both are safe as long as they're FDIC-insured, which protects your deposits up to $250,000 per account.

Does the amount of money I deposit affect the interest rate I receive?

Usually no. Most banks offer the same APY to all customers regardless of balance. A few banks use tiered rates where larger balances earn slightly higher percentages, but this is uncommon. Check the rate sheet for your specific bank to see if it uses tiered rates.

What's the best way to earn more interest on my savings?

Shop around for the highest APY available, especially at online banks. If you have money you won't need for a year or more, consider a CD, which typically pays more than a savings account. Keep your money in an account that compounds daily rather than monthly or quarterly. Avoid banks that charge monthly maintenance fees, which reduce your net earnings.