Yes, your money grows through interest, but the amount depends on the rate your bank offers

Money in a savings account grows when the bank pays you interest — a percentage of your balance that the bank adds to your account on a regular schedule. The bank uses your money to lend to other customers and invests it, so they pay you a small share of what they earn. The more money you have in the account and the higher the interest rate, the more you earn. But the growth is usually modest: at current rates, $10,000 in a savings account might earn $100 to $300 per year, depending on which bank you use.

The rate your bank pays varies widely. A large national bank might offer 0.01% annual interest, while an online bank might offer 4.5% or higher. That same $10,000 would earn only $1 per year at 0.01%, but $450 per year at 4.5%. The difference matters if you are saving for something specific or keeping money you do not plan to touch for months or years.

Key Takeaways

  • Banks pay interest on savings account balances, usually calculated daily and added monthly or quarterly, so your money grows without you doing anything.
  • The interest rate varies by bank and changes over time — online banks typically offer higher rates than large national banks.
  • Interest compounds, meaning you earn interest on the interest you already earned, so growth accelerates slightly over time.
  • Your account grows only through interest; the bank does not invest your money in stocks or bonds unless you move it to an investment account.

How interest rates are set and why they change

Banks set their own interest rates, but they follow the Federal Funds Rate — the interest rate the Federal Reserve sets for banks that lend to each other. When the Fed raises its rate, banks usually raise the interest they pay on savings accounts. When the Fed lowers its rate, banks lower what they pay you. The Fed adjusts its rate based on inflation and the overall economy, so savings account rates move up and down throughout the year.

Right now, rates are higher than they were in 2020 and 2021, when many savings accounts paid almost nothing. But rates change, and there is no may provide a high rate will stay high. If you see a rate that looks good, it is worth moving your money to that bank, but understand that the rate may drop in six months or a year.

How compounding makes your money grow faster over time

Interest compounds, which means the bank calculates interest on your original balance plus all the interest you have already earned. If you have $10,000 earning 4% per year, the bank pays you $400 in the first year. In the second year, the bank calculates interest on $10,400, so you earn $416. The difference is small at first, but it grows larger the longer your money sits in the account.

Most banks compound interest daily, which means they calculate what you owe every single day, then add it all up and deposit it into your account monthly or quarterly. Daily compounding is better for you than monthly or quarterly compounding because you earn interest on interest more often. The difference is usually small — a few dollars per year on a typical balance — but it adds up over time.

The difference between savings accounts and money market accounts

A money market account is a hybrid between a savings account and a checking account. It usually pays a higher interest rate than a regular savings account, but it also lets you write checks or use a debit card to withdraw money. The catch is that money market accounts often require a higher minimum balance — sometimes $2,500 or $10,000 — and they limit how many withdrawals you can make per month.

If you want your money to grow and you do not need to access it often, a money market account might earn you more. But if you need flexibility or have a small balance, a regular savings account is simpler. Compare the rates and the withdrawal limits at your bank before deciding.

Why savings accounts do not keep pace with inflation

Even when a savings account pays 4% interest, that growth may not be enough to protect your money from inflation — the rise in prices over time. If inflation is 3% per year and your savings account earns 4%, your money is growing in real terms, but only by 1%. If inflation is 5% and your account earns 4%, your money is actually losing value because prices are rising faster than your balance.

This is why savings accounts are meant for money you need to keep safe and accessible, not for money you are trying to grow significantly. If you want your money to outpace inflation, you would need to move it to investments like stocks or bonds, which carry more risk but historically earn higher returns over long periods.

How to find the highest interest rate for your situation

Interest rates vary by bank, account type, and balance level. Online banks almost always pay more than brick-and-mortar banks because they have lower overhead costs. Credit unions sometimes pay competitive rates, especially if you are a member. Some banks offer higher rates if you keep a minimum balance or set up automatic deposits.

To find the best rate, check the current offerings at online banks like Marcus, Ally, and American Express Personal Savings, as well as your current bank and any credit unions you belong to. Websites like Bankrate and DepositAccounts list rates from many banks and update them regularly. The difference between a 0.5% rate and a 4.5% rate is real money over a year, so it is worth spending 15 minutes to compare.

What happens to your growth if you withdraw money early

Withdrawing money from a savings account does not trigger a penalty the way it does with a certificate of deposit (CD). You can take out as much as you want whenever you want. But once you withdraw the money, it stops earning interest. If you withdraw $5,000 from a $10,000 balance, only the remaining $5,000 continues to grow.

Some banks limit how many withdrawals you can make per month — usually six — though this rule is less common now than it was before 2020. Check your account agreement to see if your bank has withdrawal limits. If you think you will need the money within a few months, a savings account is still the right place for it, but understand that frequent withdrawals slow your growth.

Frequently Asked Questions

How often does the bank add interest to my account?

Banks calculate interest daily but usually deposit it monthly or quarterly. Some banks deposit it more or less often, so check your account agreement. The frequency does not change how much you earn over a year, but daily calculation means you earn interest on interest more often, which is slightly better for you.

Can I lose money in a savings account?

No. Your balance can only stay the same or grow. The bank cannot take money out without your permission. If you withdraw money yourself, your balance goes down, but that is your choice, not the bank's. Your account is also insured by the FDIC up to $250,000, so even if the bank fails, you keep your money.

Is it better to keep money in a savings account or under my mattress?

A savings account is better because your money grows through interest and is insured. Money under a mattress earns nothing and can be lost to theft or damage. Even at 0.5% interest, a savings account is earning you something. At 4% or higher, the difference adds up quickly.

What if I move my money to a different bank — do I lose the interest I already earned?

No. The interest you have already earned stays in your account. When you move money to a new bank, you take the full balance with you, including all interest earned to date. The new bank will start paying interest at its own rate going forward.

Do I pay taxes on the interest my savings account earns?

Yes. Interest is taxable income. If you earn $100 or more in interest during the year, the bank will send you a 1099-INT form in January, and you report that income on your tax return. The amount you owe in taxes depends on your overall income and tax bracket.