What you earn depends on the bank, the account type, and the current rate environment

The interest you earn in a savings account is determined by three things: the annual percentage yield (APY) the bank offers, how much money you keep in the account, and how long it stays there. A bank offering 4.5% APY on a savings account will pay you roughly $45 per year on a $1,000 balance. A bank offering 0.01% APY will pay you roughly 10 cents on that same $1,000. The difference between these two scenarios is real money — and it matters more the larger your balance.

APY rates change constantly. Banks raise them when the Federal Reserve increases its benchmark rate, and they lower them when the Fed cuts rates. Some banks move quickly; others lag behind by weeks or months. Online banks typically offer higher rates than brick-and-mortar banks because they have lower overhead costs. Credit unions sometimes offer competitive rates to their members. Money market accounts and certificates of deposit (CDs) often pay more than regular savings accounts, but they come with restrictions on how often you can withdraw.

Interest compounds, which means you earn interest on your interest. If your account compounds daily (the most common method), the bank calculates your interest each day and adds it to your balance, so tomorrow's interest is slightly higher than today's. If it compounds monthly or annually, the gap between what you earn and what you could earn is larger. The more frequently interest compounds, the more you make — though the difference is usually small unless your balance is very large.

Key Takeaways

  • The APY your bank offers is the single biggest factor in how much interest you earn, and rates vary from under 0.01% at some traditional banks to over 5% at online banks and credit unions.
  • Online banks and credit unions typically pay higher rates than large national banks because they have lower costs and compete for deposits.
  • Interest compounds (usually daily), meaning you earn interest on the interest already added to your account, so your balance grows slightly faster than simple math suggests.
  • Your interest earnings are reported to the IRS on a Form 1099-INT if the total exceeds $10, and you owe income tax on that amount at your ordinary tax rate.
  • Moving your money to a higher-rate account can earn you hundreds or thousands of dollars per year on a large balance, even if the rate difference looks small.

How banks set their savings rates

Banks do not set rates in a vacuum. The Federal Reserve sets a benchmark interest rate (the federal funds rate), and banks use that as a starting point. When the Fed raises its rate, banks eventually raise the rates they offer on savings accounts. When the Fed cuts its rate, banks cut savings rates — often faster than they raised them. This is why your savings account rate might have been 4.5% in late 2023 and dropped to 4.0% by mid-2024.

Competition also matters. If you live in a market where five banks are all offering 4.5% APY and one bank offers 5.0%, that bank will attract more deposits. Banks know this, so they watch what competitors are paying. Online banks, which have no physical branches and lower operating costs, can afford to pay more. A large national bank with hundreds of branches might offer 0.5% APY on the same type of account because it does not need to compete as aggressively for deposits — many customers stay for convenience.

The type of account also affects the rate. A regular savings account typically pays less than a money market account, which pays less than a CD with a fixed term. Banks offer higher rates on CDs because they know your money will stay locked in for a set period (three months, one year, five years), so they can invest it with confidence. A savings account is more liquid — you can withdraw anytime — so the bank pays less to compensate for that risk.

The difference between APY and interest rate

The interest rate is the percentage the bank pays on your balance. The APY is the interest rate plus the effect of compounding over one year. If a bank quotes you a 4.5% interest rate compounded daily, the actual APY is slightly higher — maybe 4.60% — because you earn interest on your interest throughout the year. Banks are required to show you the APY, not just the interest rate, so you can compare accounts fairly.

For most savings accounts, the difference between the interest rate and the APY is small — usually less than 0.1%. But it adds up. On a $100,000 balance, that small difference can mean an extra $50 to $100 per year. On a $1,000,000 balance, it means thousands. This is why large depositors pay attention to compounding frequency. Daily compounding beats monthly compounding, which beats annual compounding.

How to calculate what you will earn

The basic formula is: (Balance × APY) ÷ 365 × number of days the money sits in the account. If you have $10,000 in an account paying 4.5% APY and leave it there for one full year, you earn roughly $450. If you leave it there for six months, you earn roughly $225. If you deposit $10,000 mid-month and withdraw it mid-month the following month, you earn roughly $37.

Most banks calculate interest daily but pay it monthly. This means your balance grows slightly each day, but you see the deposit once a month. Some banks pay interest quarterly or annually, which means your money sits longer before earning interest on that interest. The difference is small for most people, but it compounds over years.

You can use a savings calculator (most banks provide one on their website) to estimate earnings, but the math is straightforward enough to do yourself. The key is knowing the APY and how long your money will stay in the account. If you are not sure whether to move your money to a higher-rate account, calculate what you would earn in each account over the next year. If the difference is more than a few dollars, the move is worth the time it takes.

When interest earnings are taxed

Interest you earn in a savings account is taxable income. If you earn $10 or more in interest during a calendar year, the bank sends you a Form 1099-INT and reports the amount to the IRS. You include that amount on your tax return and pay income tax on it at your ordinary tax rate. If you are in the 22% tax bracket and earn $450 in interest, you owe roughly $99 in federal income tax on that interest (plus any state income tax, depending on where you live).

This is why the real return on a savings account is lower than the APY suggests. If you earn 4.5% APY but pay 22% in taxes on that interest, your after-tax return is closer to 3.5%. This does not change what you should do — you still want the highest rate available — but it is worth understanding when you are deciding whether to move money around or comparing savings accounts to other options.

Some accounts, like those in a Roth IRA or a 529 education savings plan, allow interest to grow tax-free or tax-deferred. If you have money earmarked for retirement or education, putting it in one of these accounts can make a significant difference over time because you are not paying taxes on the interest each year.

Why rates vary so much between banks

The same type of account at two different banks can pay wildly different rates. A large national bank might offer 0.01% APY on a regular savings account, while an online bank offers 4.5% APY on the exact same product. The difference is not fraud or a mistake — it is business strategy.

Large banks with extensive branch networks have high operating costs. They do not need to compete aggressively on savings rates because customers stay for convenience (the nearest branch, the familiar app, the relationship with a local banker). They make money on loans and fees, not on the interest they pay depositors. Online banks have no branches, no tellers, and minimal overhead. They compete almost entirely on rate, so they pass more of their profits to depositors.

Credit unions are member-owned, not shareholder-owned, so they can return profits to members in the form of higher rates. Some credit unions offer rates competitive with online banks. However, credit unions have membership requirements — you might need to work for a specific employer, live in a specific area, or belong to a specific organization to join.

Banks also adjust rates based on how much money they need. If a bank has plenty of deposits and does not need more, it might lower its savings rate. If a bank is trying to grow its deposit base, it might raise rates to attract new customers. This is why you might see a bank offer an unusually high rate for a few months, then drop it back down once it has collected enough deposits.

Moving money to a higher-rate account

If your current bank is paying 0.5% APY and you find an online bank paying 4.5% APY, moving your money is straightforward. You open an account at the new bank, transfer your balance (usually via ACH, which takes three to five business days), and close the old account if you want. There is no penalty for moving savings accounts, and you do not lose any interest you have already earned.

The only cost is your time. You need to update any automatic deposits or bill payments that were tied to the old account. You might need to wait a few days for the transfer to complete. But if you have $50,000 in savings, moving it from a 0.5% account to a 4.5% account means earning an extra $2,000 per year. That is worth a few minutes of work.

Some people worry about moving money frequently to chase the highest rate. This is not necessary. Rates do not change daily in a way that matters to most depositors. Pick a bank offering a competitive rate and stay there unless the rate drops significantly or you find a much better option. Chasing an extra 0.1% APY is not worth the hassle.

Frequently Asked Questions

Do I pay taxes on savings account interest?

Yes. If you earn $10 or more in interest during a calendar year, the bank reports it to the IRS on a Form 1099-INT, and you owe income tax on that amount at your ordinary tax rate. Interest earned in tax-advantaged accounts like Roth IRAs or 529 plans may be tax-free or tax-deferred, depending on the account type and how you use the money.

Why is my savings account rate so low compared to what I see advertised?

Large national banks typically offer much lower rates than online banks or credit unions because they do not need to compete as aggressively for deposits. They make money on loans and fees, not on interest paid to depositors. If you want a higher rate, you will need to move your money to an online bank or credit union.

Does it matter if interest compounds daily or monthly?

It matters slightly. Daily compounding means you earn interest on your interest more often, so your balance grows a bit faster. On a $10,000 balance at 4.5% APY, the difference between daily and monthly compounding is roughly $3 to $5 per year. On larger balances, the difference is more noticeable.

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

Most banks calculate interest daily based on your balance each day. If you withdraw money, you stop earning interest on that amount starting the next day. Interest already earned and added to your account stays with you. Some banks use a "low balance" method where they pay interest only on the lowest balance during the month, which penalizes withdrawals more heavily.

Can I earn more interest by moving money between accounts?

No. Moving money between accounts at the same bank does not increase your interest earnings — you are just moving the same balance from one account to another. However, moving money from a low-rate account at one bank to a high-rate account at another bank does increase your earnings significantly. The difference between 0.5% and 4.5% APY on a $50,000 balance is $2,000 per year.