Yes, money in a savings account earns interest, but the amount depends on the rate your bank offers

When you deposit money into a savings account, the bank pays you interest — a percentage of your balance — for letting them use that money. The interest rate varies by bank and changes over time. A bank offering 4.5% annual interest will pay you more than one offering 0.01%, and the difference compounds quickly on larger balances.

Interest accrues either daily, monthly, or quarterly, depending on the account. Most banks calculate it daily but credit it to your account monthly or quarterly. This means your balance grows even when you do nothing, though the growth is modest at lower rates.

The catch: interest rates are not may provide. Banks can lower the rate whenever they choose, and they often do when the Federal Reserve cuts its benchmark rate. If you opened an account at 5% and the Fed drops rates, your bank may drop yours to 3% or lower within weeks.

Key Takeaways

  • Banks pay interest on savings account balances as a percentage per year, calculated daily or monthly depending on the account.
  • The interest rate varies by bank and is not fixed — banks can lower your rate at any time without your permission.
  • Higher interest rates are usually found at online banks rather than brick-and-mortar branches, though online banks change rates more frequently.
  • Interest compounds when the bank credits it to your account, meaning you earn interest on your interest in future periods.
  • The actual dollars you earn depend on both the rate and your balance — a 4% rate on $1,000 earns roughly $40 per year, while the same rate on $10,000 earns roughly $400.

How banks calculate and credit interest to your account

Most banks use daily compounding, which means they calculate interest on your balance every single day. The formula is straightforward: your balance multiplied by the annual rate, divided by 365 days. If you have $5,000 and the rate is 4.5%, the bank calculates roughly $0.62 in interest per day.

The bank does not add that $0.62 to your account every day. Instead, it holds the daily calculations and credits the total once per month or quarter. When it credits the interest, that amount joins your balance, and the next period's interest is calculated on the larger number. This is compounding — earning interest on your interest.

The timing matters. If you deposit $5,000 on the 15th of the month, most banks start calculating interest when ready. If you withdraw $2,000 on the 20th, the interest calculation for those days drops to $3,000. Banks track your balance on each day and use the average or the lowest balance during the period, depending on the account terms.

Why interest rates vary so much between banks

Online banks typically offer higher rates than traditional banks because they have lower overhead costs — no branch staff, no physical locations, no tellers. A bank like Marcus or Ally can offer 4% or higher because they spend less money to operate. A local bank branch might offer 0.01% because they use deposits to fund mortgages and business loans, not to maximize savings account returns.

The Federal Reserve's benchmark rate also drives all savings rates up or down. When the Fed raises its rate, banks raise savings rates to attract deposits. When the Fed cuts, banks cut rates quickly — sometimes within days. The Fed's rate is not the same as your savings rate, but it sets the floor. If the Fed's rate is 5.25%, you will not find a savings account paying 0.5%.

Competition between banks matters too. When one major online bank raises its rate to 5%, others often follow within weeks to keep customers from moving their money. When rates are falling, banks cut more slowly because they want to keep deposits.

The difference between stated rate and actual earnings

Banks advertise the Annual Percentage Yield (APY), which is the rate you will actually earn if you leave money in the account for a full year. This is different from the interest rate itself because APY includes the effect of compounding. A bank might offer 4.5% APY, which means if you deposit $10,000 and touch nothing for a year, you will have $10,450.

The actual dollars you earn depend on how long your money sits in the account. If you deposit $10,000 at 4.5% APY and withdraw it after six months, you earn roughly $225, not $450. The interest is prorated based on the number of days the money was in the account.

Some accounts offer tiered rates — higher rates on larger balances. A bank might pay 3.5% on balances under $25,000 and 4.5% on balances above that. If your balance crosses the threshold, the higher rate applies only to the amount above the line, not retroactively to your entire balance.

When banks lower rates and what you can do about it

Banks can lower your interest rate without your permission and without advance notice in most cases. Federal law does not require banks to notify you before a rate cut, though many do send an email or letter after the change takes effect. You will notice the cut when your monthly interest deposit shrinks.

If your bank cuts rates and you want a higher return, you can move your money to another bank. There is no penalty for closing a savings account and transferring funds elsewhere. The process takes three to five business days via ACH transfer. Some people keep accounts at multiple banks to chase the highest rates, though this requires tracking multiple logins and statements.

Rate cuts are most common when the Federal Reserve cuts its benchmark rate. If you locked in a high rate during a period of high Fed rates, expect your bank to lower it when the Fed moves. This is why timing matters — opening a savings account when rates are high and the Fed is holding steady gives you a longer window before cuts arrive.

How much interest you actually earn on different balances

The relationship between balance, rate, and time is straightforward math. At 4.5% APY, a $1,000 balance earns roughly $45 per year, or $3.75 per month. A $10,000 balance earns $450 per year, or $37.50 per month. A $100,000 balance earns $4,500 per year, or $375 per month.

These numbers assume the rate stays constant for the full year and you make no deposits or withdrawals. In reality, rates change and balances fluctuate. If you deposit $5,000 on the first of the month and withdraw $2,000 on the 15th, the bank calculates interest on both amounts for the days they were in the account.

The larger your balance, the more interest matters. On $1,000, the difference between 0.5% and 4.5% is $40 per year — meaningful but not life-changing. On $100,000, the same difference is $4,000 per year. This is why people with larger savings shop for higher rates more aggressively.

Frequently Asked Questions

Does interest get taxed?

Yes. Interest earned in a savings account is taxable income. Banks send you a 1099-INT form each January if you earned $10 or more in interest during the year. You report this on your tax return. The tax rate depends on your overall income and tax bracket.

Can a bank take away my interest if I withdraw money early?

No. Savings accounts have no early withdrawal penalty. You can withdraw money anytime without losing interest you have already earned. Interest is calculated through the day you withdraw, so you keep every penny accrued up to that point.

What happens to my interest if the bank fails?

Your deposits and accrued interest are protected up to $250,000 per account by the FDIC (Federal Deposit Insurance Corporation). If a bank fails, the FDIC pays you the full balance including all interest earned through the failure date.

Is interest the same as APY?

No. Interest rate is the percentage the bank pays; APY is what you actually earn after compounding is included. A bank might advertise 4.5% APY, which is the number that matters for your actual earnings. The underlying interest rate is slightly lower because of how compounding works.

Can I move my money to a higher-rate account without losing interest?

Yes. When you transfer money to another bank, you keep all interest earned through the transfer date. The old bank calculates interest through the day the money leaves, and the new bank starts calculating from the day it arrives. There is no gap or loss.