Interest is money the bank pays you for letting them use your deposits

When you put money in a savings account, the bank lends that money to other customers through mortgages, car loans, and business credit lines. The bank keeps the difference between what it pays you and what it charges borrowers. The amount the bank pays you is called interest.

The bank expresses this payment as a percentage of your balance, called the annual percentage yield or APY. If your account has an APY of 4.50%, and you hold $1,000 in the account for a full year without deposits or withdrawals, the bank will add $45 to your balance. The actual mechanics depend on how often the bank compounds the interest—daily, monthly, or quarterly—but the APY already accounts for that compounding, so you can compare rates directly across banks.

Interest rates on savings accounts change. Banks set their own rates based on what the Federal Reserve does with its benchmark rate. When the Fed raises rates, banks typically raise savings rates within weeks. When the Fed cuts rates, banks usually cut savings rates faster than they raised them. You will not see your rate locked in for years the way a mortgage rate is locked; your bank can change your savings rate at any time, though most give you notice first.

Key Takeaways

  • Banks pay you interest because they lend out your deposits to other customers and keep the spread between what they pay you and what borrowers pay them.
  • The annual percentage yield (APY) tells you the percentage return you will earn in a year, and it already includes the effect of how often interest compounds.
  • Interest rates on savings accounts move with Federal Reserve policy and change frequently, so the rate you see today may be different in three months.
  • The amount of interest you earn depends on three things: your balance, the APY, and how long your money stays in the account.
  • High-yield savings accounts at online banks typically offer higher APYs than traditional brick-and-mortar banks because they have lower overhead costs.

How the bank calculates the interest you earn

The calculation itself is straightforward: balance multiplied by APY divided by 365 days, then multiplied by the number of days your money was in the account. If you have $5,000 at 4.50% APY and leave it untouched for 30 days, you earn roughly $18.49. The bank does this calculation daily, adds the daily interest to your balance, and then calculates the next day's interest on the new, slightly larger balance. This is called compounding.

Compounding matters more the longer your money sits. Over a year, daily compounding at 4.50% APY on $5,000 produces $225.56 in interest, not $225 flat. The difference is small in this example, but it grows with larger balances and longer time periods. This is why the APY figure is more useful than the stated interest rate: the APY already includes the compounding effect, so you can trust it as the true annual return.

Most banks show you the interest earned in your account statement or online dashboard. You can also calculate it yourself using the formula: (balance × APY ÷ 365) × number of days. Some banks round to the nearest cent; others round down. The difference is negligible, but if you want exact figures, ask your bank how it handles rounding.

Why rates differ between banks and account types

Online banks typically offer higher APYs than traditional banks because they do not maintain physical branches, employ fewer staff, and have lower rent and technology costs. A bank like Ally or Marcus can offer 4.50% APY on a basic savings account, while a regional bank might offer 0.01% on the same account type. The difference is real and compounds over time.

Within a single bank, different account types earn different rates. A money market account might earn 4.75% APY while a regular savings account earns 4.50%. A certificate of deposit (CD) might earn 5.25% if you lock your money away for one year. The bank pays more for CDs because you cannot withdraw the money without penalty, so the bank knows it can lend that money out for a longer, more predictable period.

Some banks offer promotional rates for new customers—a higher APY for the first three or six months, then a drop to the standard rate. Read the terms carefully. The promotional rate applies only to new accounts or new deposits, not to money you already had at the bank. After the promotional period ends, your rate drops unless you move your money to a different bank or account type.

What happens to your interest if you withdraw money early

Withdrawing money from a savings account does not trigger a penalty the way withdrawing from a CD does. You can take out any amount at any time without losing the interest you have already earned. However, you stop earning interest on the money you withdraw the moment it leaves the account.

If you have $10,000 earning 4.50% APY and you withdraw $5,000 on day 180 of the year, you earn interest on the full $10,000 for 180 days, then interest on the remaining $5,000 for the remaining 185 days. The bank calculates this daily, so the timing of your withdrawal matters down to the day. Some banks process withdrawals at the end of the business day, so a withdrawal you make at 11 p.m. might not reduce your earning balance until the next morning.

How federal regulations limit the number of withdrawals you can make

Federal Regulation D once capped savings account withdrawals at six per month. That rule was suspended in 2020 and has not been reinstated, so most banks no longer enforce withdrawal limits on savings accounts. However, some banks still maintain their own internal limits—typically six to ten withdrawals per month—and charge a fee if you exceed them. Check your account agreement or ask your bank directly about its withdrawal policy.

The withdrawal limit does not explore to transfers between your own accounts at the same bank, only to transfers to external accounts or cash withdrawals. If you need to move money frequently, a checking account is more practical than a savings account, even though checking accounts earn little or no interest.

The difference between APY and interest rate

Banks sometimes advertise an interest rate and an annual percentage yield separately. The interest rate is the raw percentage the bank pays, without accounting for compounding. The APY is the true annual return after compounding is included. For savings accounts, the difference is usually small—less than 0.1%—but it exists.

For example, a bank might advertise a 4.48% interest rate that compounds daily, which works out to a 4.50% APY. The APY is the number that matters for comparing accounts across banks, because it is standardized and already includes compounding. Always compare APYs, not advertised rates.

How inflation affects what your interest actually buys

Interest earnings are real money, but inflation erodes their purchasing power. If your savings account earns 4.50% APY and inflation is running at 3.5%, your money is gaining purchasing power at roughly 1% per year. If inflation is 5%, your real return is negative—your money buys less next year even though the balance is higher.

This is not a reason to avoid savings accounts. It is a reason to understand that savings accounts are meant to preserve money safely, not to make it grow faster than inflation. If you want returns that outpace inflation, you would need to take on investment risk through stocks or bonds, which savings accounts do not offer. A savings account is the right tool for money you need to access within a few years. For longer time horizons, other strategies may make sense.

Frequently Asked Questions

Do I have to pay taxes on the interest I earn?

Yes. Interest on savings accounts is taxable income. Banks report interest earnings of $10 or more on Form 1099-INT, which you receive by January 31. You report this income on your tax return. The interest is taxed at your ordinary income tax rate, not at the lower capital gains rate.

Can a bank lower my interest rate without telling me?

Yes, banks can change savings account rates at any time without your permission. Most banks notify customers before a rate cut, but they are not required to. You can switch to a different bank or account type if your rate drops significantly. Some banks offer rate guarantees for a set period, usually 30 to 90 days, but these are promotional offers, not standard practice.

What is the highest interest rate I can find on a savings account right now?

Rates change weekly based on Federal Reserve decisions and bank competition. Online banks currently offer rates between 4.25% and 5.35% APY on high-yield savings accounts, while traditional banks typically offer 0.01% to 0.50%. Check current rates directly on bank websites or rate comparison sites, as rates quoted here would be outdated within weeks.

Does keeping more money in my account earn me a higher interest rate?

No. The APY is the same whether your balance is $100 or $100,000. Some banks offer tiered rates where larger balances earn slightly higher APYs, but this is uncommon. The interest you earn scales with your balance—more money earns more interest at the same rate—but the rate itself does not change based on how much you have.

What happens to my interest if the bank fails?

The Federal Deposit Insurance Corporation (FDIC) insures deposits up to $250,000 per depositor per bank. If your bank fails, the FDIC pays you the full balance of your account, including all accrued interest, up to the $250,000 limit. Interest earned but not yet posted to your account is still covered. You do not lose interest because of a bank failure.