Interest is money the bank pays you for letting them hold your money

When you deposit money into a savings account, the bank lends that money to other customers through mortgages, car loans, and business loans. In exchange, the bank pays you interest — a percentage of your balance, calculated and added to your account on a schedule the bank sets. The more money you keep in the account and the higher the interest rate, the more you earn.

Interest rates vary widely between banks and change over time based on what the Federal Reserve does with its benchmark rate. A savings account at one bank might pay 0.01% annual interest while another pays 4.5% — that difference compounds into hundreds or thousands of dollars over years, depending on your balance.

You do not have to do anything to earn interest once your account is open. The bank calculates it automatically and deposits it into your account on a schedule, usually monthly or daily. The interest becomes part of your balance and earns interest itself in the next period — this is called compounding.

Key Takeaways

  • Interest rates on savings accounts range from nearly zero to over 4% depending on the bank and current market conditions, so comparing rates before opening an account matters.
  • Banks calculate interest daily but usually deposit it monthly, and the deposited interest then earns interest in future periods through compounding.
  • Online banks typically offer higher rates than brick-and-mortar banks because they have lower overhead costs.
  • The Federal Reserve's interest rate decisions affect what banks pay savers, so rates rise and fall over time — locking in a high rate now does not may provide it will stay high.

How banks calculate and pay interest on your balance

Banks use one of two methods to calculate interest: simple interest or compound interest. Most savings accounts use compound interest, which means you earn interest on your original balance plus all the interest that has already been added.

The bank calculates interest based on your average daily balance during the period — usually one month. If you have $10,000 in the account for the entire month and the annual rate is 4%, the bank divides 4% by 12 to get the monthly rate (about 0.33%), then multiplies that by your balance. That gives you roughly $33 in interest for the month. That $33 is added to your account, and next month you earn interest on $10,033.

Some banks calculate and deposit interest daily instead of monthly, which means your money starts earning interest on the new total sooner. Over years, daily compounding adds up to noticeably more money than monthly compounding at the same rate, though the difference is small in the first few months.

Why interest rates differ between banks and over time

The Federal Reserve sets a benchmark interest rate that influences what all banks pay. When the Fed raises its rate, banks typically raise the rates they pay on savings accounts within weeks or months. When the Fed lowers its rate, banks lower savings rates too — sometimes faster than they raise them.

Online banks almost always pay higher rates than traditional banks with physical branches. An online bank has no branch buildings, tellers, or local staff, so it spends far less money to operate. It passes some of that savings to customers through higher interest rates. A brick-and-mortar bank might pay 0.01% while an online bank pays 4.5% on the same type of account.

Banks also compete for deposits. When one bank raises its rate to attract new customers, others often follow. Rates can shift monthly or even weekly during periods when the Fed is actively changing policy. If you opened an account when rates were low and rates have since risen, your bank may not have raised your rate automatically — you might earn more by moving your money to a different bank.

Types of savings accounts and their interest rates

A standard savings account is the most common type. Interest rates vary by bank but are usually modest — currently ranging from 0.01% to 4.5% depending on where you bank. You can withdraw money whenever you want without penalty.

A money market account often pays a slightly higher rate than a standard savings account and may require a higher minimum balance to open. It usually comes with a debit card or checkbook, so you can access your money more easily than with a regular savings account.

A certificate of deposit (CD) locks your money away for a set period — three months, six months, one year, or longer — in exchange for a higher interest rate. If you withdraw before the term ends, the bank charges a penalty that can wipe out months of interest. CDs make sense if you know you will not need the money for a specific length of time.

A high-yield savings account is simply a savings account at an online bank that pays a much higher rate than traditional banks. The name does not mean a special account type — it just means the rate is unusually good. These accounts are insured by the FDIC the same way regular savings accounts are.

How to find the best interest rate for your situation

Start by listing what you need from the account: Do you want to withdraw money regularly, or are you saving for a specific goal months or years away? Do you have a large lump sum to deposit, or will you add money gradually? How much money do you plan to keep in the account?

If you need access to your money, compare interest rates at online banks offering high-yield savings accounts. Sites like Bankrate, DepositAccounts, and NerdWallet let you filter by rate and sort by bank. Write down the top five rates and check each bank's website to confirm the rate is current — rates change frequently.

If you know you will not touch the money for a year or more, compare CD rates instead. A one-year CD at a bank paying 5% will earn you significantly more than a savings account at 4.5%, especially if you have a large balance. Use the same comparison sites to find current CD rates by term length.

Check whether the bank requires a minimum balance to open the account or to earn the advertised rate. Some banks pay the high rate only if you maintain a balance above a certain amount — $25,000 or $100,000, for example. If you cannot meet that minimum, the rate you actually earn will be lower.

What happens to your interest if you move your money or close the account

Interest you have already earned belongs to you. If you close the account or move your money to another bank, you keep all the interest that has been deposited into your account. The bank will not take it back.

Interest that has been calculated but not yet deposited depends on the bank's policy. Most banks deposit interest monthly, so if you close your account mid-month, you may lose the interest earned so far that month. Check your account agreement or call the bank to ask when interest is deposited and what happens if you close before that date.

If you move money from a savings account to a checking account at the same bank, the interest stops accruing on that money once it leaves the savings account. Interest only accrues on balances in the savings account itself.

How inflation affects what your interest earnings are actually worth

Inflation is the rate at which prices for goods and services rise over time. If inflation is 3% per year and your savings account earns 2% interest, your money is actually losing purchasing power — you can buy less with it next year even though the dollar amount is higher.

When interest rates are high, like they have been recently, savings accounts can keep pace with or beat inflation. A 4.5% interest rate when inflation is 3% means your money is genuinely growing in value. But when interest rates are low — say 0.5% — and inflation is 2%, your savings are shrinking in real terms.

This does not mean you should avoid savings accounts when rates are low. Savings accounts are meant to be safe places to keep money you need soon, not investments meant to beat inflation over decades. But it is worth understanding that in low-rate environments, the real value of your savings is declining slightly each year.

Frequently Asked Questions

Do I have to pay taxes on interest I earn from a savings account?

Yes. Interest is considered income by the IRS. Your bank will send you a Form 1099-INT at the end of the year if you earned $10 or more in interest, and you must report that amount on your tax return. The interest is taxed at your ordinary income tax rate, not at a special rate.

Can I lose money in a savings account if the interest rate drops?

No. Your original deposit is protected by FDIC insurance up to $250,000 per bank. If the interest rate drops, you simply earn less going forward — the money you already have stays in the account. You will not lose any of your principal.

What is the difference between APR and APY on a savings account?

APR is the annual percentage rate without accounting for compounding. APY is the annual percentage yield and includes the effect of compounding. Banks are required to show you the APY, which is the number that matters for comparing accounts. A 4% APY will earn you more than a 4% APR because of compounding.

Should I move my money to a different bank if another bank is offering a higher rate?

It depends on how much money you have and how much higher the rate is. Moving $5,000 from a bank paying 0.5% to one paying 4.5% will earn you about $200 more per year — worth the effort. Moving $500 will earn you only $20 more, which may not be worth the time to open a new account and transfer the money.

Do online banks pay interest faster than traditional banks?

No. The speed at which interest is calculated and deposited depends on the bank's policy, not whether it is online or brick-and-mortar. Most banks deposit interest monthly. Some online banks deposit daily, but this is a choice by the bank, not a rule for all online banks.