What a savings account interest rate is

A savings account interest rate is the percentage of your balance that a bank or credit union pays you each year for letting them hold your money. If you keep $1,000 in a savings account with a 4.5% annual rate, the bank adds $45 to your account over twelve months (though most banks calculate and deposit interest monthly or daily, not all at once).

The rate is the bank's way of borrowing from you. They take deposits from thousands of customers, lend that money out as mortgages and business loans, and pay you a small cut of what they earn. The rate you receive depends on how much money you have, which bank you choose, and what type of account you open.

Interest rates on savings accounts change constantly. A rate that is 4.5% today might be 3.8% next month if the Federal Reserve lowers its benchmark rate, or it might stay the same if the bank decides to keep it competitive. Some banks lock in a rate for a set period (like a certificate of deposit); most savings accounts let the bank change the rate whenever they want.

Key Takeaways

  • Banks pay you interest on savings account balances as a percentage per year, calculated and deposited monthly or daily depending on the bank.
  • The rate you receive varies by bank, account type, and balance size—online banks typically offer higher rates than brick-and-mortar branches.
  • Interest rates move when the Federal Reserve changes its benchmark rate, but banks can also raise or lower rates independently.
  • You can compare current rates across banks before opening an account, and you can move your money if a bank lowers its rate.

How banks calculate and pay interest

Most banks use daily compounding, which means they calculate interest on your balance every single day, then add that day's earnings to your account. The next day, they calculate interest on the new, slightly larger balance. This compounds—your interest earns interest—and over months or years the effect becomes noticeable.

A bank with a 4.5% annual rate does not add 4.5% all at once. Instead, they divide 4.5% by 365 days (or sometimes 360), giving roughly 0.0123% per day. They apply that daily rate to your current balance, add the result to your account, and repeat. Most banks deposit the accumulated interest into your account monthly, though some do it weekly or quarterly.

The difference between daily compounding and monthly compounding is small on small balances but grows as your balance grows. On $10,000 at 4.5% annual rate, daily compounding earns roughly $450 per year; monthly compounding earns slightly less. The bank's disclosure documents (called the Truth in Savings Act disclosure) will state exactly how often they compound.

Why rates differ between banks and account types

Online banks almost always offer higher rates than banks with physical branches. An online bank has no building costs, no tellers, no branch staff—so they pass more of their profit to depositors. A brick-and-mortar bank might offer 0.01% while an online bank offers 4.5% on the same type of account.

Account type also matters. A regular savings account usually earns less than a high-yield savings account (HYSA), which earns less than a money market account, which earns less than a certificate of deposit (CD) if you lock your money away for a set term. Banks pay more for accounts where you commit to leaving money untouched or where you accept other restrictions.

Your balance size can affect your rate too. Some banks offer tiered rates: balances under $25,000 earn 3.5%, balances from $25,000 to $100,000 earn 4.0%, and balances over $100,000 earn 4.5%. A few banks offer the same rate regardless of balance. Check the bank's rate sheet to see whether your balance size qualifies for a higher tier.

What moves interest rates up and down

The Federal Reserve sets a benchmark interest rate (called the federal funds rate) that influences all other rates in the economy. When the Fed raises its rate, banks typically raise savings account rates within days or weeks. When the Fed lowers its rate, banks lower savings rates more slowly—sometimes within weeks, sometimes within months.

Banks also change rates independently of the Fed. A bank might lower its rate to save money even if the Fed rate stays the same, or raise it to attract new deposits during competitive periods. You will see the biggest rate swings during periods when the Fed is actively raising or lowering rates; during stable periods, rates move less often.

The rate you see advertised is the rate new customers receive. Existing customers sometimes earn a different rate, especially if they opened their account years ago. Some banks grandfather old rates (keep paying the old rate indefinitely), while others eventually move all customers to the current rate. Check your account statements or call the bank to confirm what rate you are actually earning.

How to compare rates before opening an account

Use a rate comparison site like Bankrate, DepositAccounts, or the Federal Deposit Insurance Corporation (FDIC) website to see current rates across multiple banks. These sites update daily and let you filter by account type, minimum balance, and whether you want a local branch or online-only bank.

When comparing, look at three things: the annual percentage yield (APY), which includes the effect of compounding; the minimum balance required to earn that rate; and whether the rate is promotional (temporary) or standard. A bank advertising 5.0% APY might require a $25,000 minimum balance, or the 5.0% might drop to 3.5% after three months.

Read the fine print in the bank's Truth in Savings Act disclosure. This document states the exact rate, how often interest compounds, when interest is credited to your account, and whether the bank can change the rate. If the bank can change the rate at any time (which most can), the disclosure will say so.

Moving your money if rates drop

You are not locked into a savings account rate. If your bank lowers its rate and you find a better rate elsewhere, you can open a new account at another bank and transfer your money. There is no penalty for closing a savings account (unlike a CD, which charges a penalty if you withdraw early).

The transfer itself takes three to five business days if you use an external transfer, or it can be instant if you withdraw cash and deposit it at the new bank. Some banks offer a "transfer service" where they pull money directly from your old bank—ask the new bank whether they offer this.

Before you move, confirm that the new bank's rate is not promotional. A promotional rate might be 5.0% for three months, then drop to 2.5%. If you move your money for a promotional rate, you will earn less after the promotion ends than if you had stayed put. Compare the standard rate, not the promotional rate, when deciding whether to switch.

How interest rates affect your savings goals

A higher interest rate means your money grows faster without you doing anything. On $10,000, the difference between 0.01% and 4.5% is roughly $450 per year—money you would not earn at a low-rate bank. Over five years, that difference compounds to roughly $2,400 more in your account.

The effect is larger with bigger balances and longer time horizons. On $50,000 at 4.5% for five years, you earn roughly $12,000 in interest. On $50,000 at 0.01% for five years, you earn roughly $25. The difference is not small.

However, interest rates are not may provide to stay high. If the Fed lowers rates, your bank will likely lower your rate too. If you are saving for a goal years away, do not assume today's rate will hold. Plan for rates to move, and treat higher interest as a bonus, not a may provide.

Frequently Asked Questions

Can I lose money if interest rates drop?

No. Your account balance never shrinks because of a rate drop. If your rate falls from 4.5% to 2.0%, you still have all your money—you just earn less interest going forward. The only way to lose money in a savings account is to withdraw it or if the bank fails (though the FDIC insures up to $250,000 per account).

Is the APY the same as the interest rate?

Not exactly. The interest rate is the percentage the bank pays; the APY (annual percentage yield) is the rate plus the effect of compounding. A bank might advertise a 4.5% interest rate but a 4.59% APY because of daily compounding. Always compare APY when choosing between banks, not the stated rate.

What happens to my interest if I withdraw money mid-month?

Most banks calculate interest based on your daily balance. If you have $10,000 for 20 days and $5,000 for 10 days, the bank calculates interest on both amounts for the days you held them. You do not forfeit all interest for the month just because you withdrew money partway through.

Do I pay taxes on savings account interest?

Yes. Interest earned in a savings account is taxable income. Banks send you a 1099-INT form at the end of the year if you earned $10 or more in interest, and you report that amount on your tax return. The interest is taxed as ordinary income at your regular tax rate.

Can a bank change my interest rate without telling me?

Banks can change rates without your permission, but they must notify you before the change takes effect. The notification usually comes by email or mail. You have the right to close your account if you disagree with a rate change, though you cannot undo the change itself.