How your bank decides what interest rate you get

Your savings account interest rate comes from two sources: the federal funds rate set by the Federal Reserve, and your bank's own decision about how much of that rate to pass on to you. The Federal Reserve does not set savings rates directly — it sets a target range for the rate banks charge each other for overnight loans. When that range moves, banks typically adjust what they offer savers within weeks, though some move faster than others.

Your specific rate depends on the account type you hold. A money market account usually pays more than a basic savings account. A certificate of deposit (CD) locks in a fixed rate for a set term — three months, one year, five years — and that rate stays the same no matter what happens to the federal funds rate while your money is locked in. High-yield savings accounts, often offered by online banks, typically pay significantly more than brick-and-mortar banks because they have lower overhead costs.

Banks are not required to offer the same rate to all customers. Some offer promotional rates to new account holders for a limited time, then drop the rate after the promotional period ends. Others tiered rates based on your balance — hold $100,000 and you might earn 4.50%, but hold $10,000 and earn 3.75%. Always check what rate applies to your specific balance and account type before you move money.

Key Takeaways

  • Banks set their own savings rates based on the federal funds rate, so the same Federal Reserve change produces different rates across different banks.
  • High-yield savings accounts and money market accounts typically pay more than standard savings accounts at the same bank.
  • Promotional rates expire after a set period, so confirm whether your current rate is temporary or permanent.
  • Interest compounds — meaning you earn interest on your interest — and the frequency of compounding (daily, monthly, quarterly) affects your total earnings.
  • Your bank must disclose the Annual Percentage Yield (APY) before you open the account, which shows the true rate including compounding.

The difference between APR and APY

Banks must show you two numbers: the Annual Percentage Rate (APR) and the Annual Percentage Yield (APY). The APR is the basic interest rate — if your savings account APR is 4%, that is the percentage your bank will pay on your balance. The APY is what you actually earn after compounding is factored in.

Compounding means your bank pays interest on the interest you have already earned. If your account compounds daily, the bank calculates interest on your balance every single day, adds that interest to your account, and then the next day calculates interest on the larger balance. Over a year, this compounds into a return slightly higher than the APR alone. The more frequently interest compounds, the higher your APY will be compared to the APR. A 4% APR compounded daily produces a different APY than a 4% APR compounded monthly, even though the base rate is identical.

Your bank's disclosure documents will state the compounding frequency. Most online banks compound daily, which is why their APY is slightly higher than their APR. Some banks compound monthly or quarterly, which produces a lower APY. When comparing accounts across banks, always compare APY to APY, not APR to APY — that is the only fair comparison.

When and how often interest posts to your account

Interest does not hit your account on a fixed schedule across all banks. Some banks post interest monthly, others quarterly, and a few post daily or weekly. Your account agreement or the bank's website will state the posting frequency. The posting date matters because until interest is actually posted, it is not yet in your account — it is being calculated but not yet yours to withdraw.

Even though interest may be calculated daily, it often posts less frequently. A bank might calculate interest every day but only add it to your balance once a month. This means if you withdraw your money on the 25th of the month and interest posts on the 30th, you will not receive that month's interest. Check your account agreement for the exact posting schedule and whether there are any conditions — for instance, some accounts only post interest if you maintain a minimum balance through the posting date.

If you move money between accounts or close an account before interest posts, confirm with your bank whether you will still receive the interest that was calculated. Most banks will pay it, but some have conditions. It is worth asking before you make a move.

How balance changes affect your interest earnings

Banks calculate interest based on your account balance, so the more money you hold and the longer you hold it, the more interest you earn. If you deposit $10,000 on January 1st and leave it untouched for a full year at 4% APY, you will earn roughly $400. If you deposit that same $10,000 on December 1st, you will earn only about $33 for that month.

Some banks use the average daily balance method, which adds up your balance at the end of each day and divides by the number of days in the period. Others use the minimum balance method, which pays interest only on the lowest balance you held during the period. A few use the ending balance method, which pays interest only on what you have in the account on the last day of the period. Your account agreement will specify which method your bank uses. The average daily balance method is most common and usually most favorable to you.

If you are saving for a specific goal, understand that withdrawals reduce your balance and therefore reduce your interest earnings for that period. A $5,000 withdrawal mid-month will lower your average daily balance for that month, which lowers the interest you earn. This is not a penalty — it is straightforward how interest math works.

What happens to your interest if rates fall

When the Federal Reserve lowers its target rate, banks typically lower the rates they offer savers within a few weeks. Your existing savings account rate will drop to whatever your bank's new rate is. If you are in a CD with a locked-in rate, that rate does not change — you keep earning the same percentage until the CD matures. But once it matures, if you renew it, you will get the new lower rate.

This is why some savers move money to CDs when rates are high — they lock in that rate for a set period. If you think rates might fall, a one-year or two-year CD protects you from having to accept a lower rate on that portion of your savings. However, if rates rise instead, you are stuck with the lower locked-in rate while new savers get the higher rate. There is no perfect strategy; it depends on what you think will happen and how much certainty you want.

High-yield savings accounts have no lock-in period, so your rate can change at any time. This means you benefit when ready if rates rise, but you also lose when ready if rates fall. Some savers keep part of their money in a high-yield savings account for flexibility and part in CDs for rate protection.

Taxes on savings account interest

Interest you earn on a savings account is taxable income. Your bank will send you a Form 1099-INT at the end of the year if you earned $10 or more in interest. You must report this interest on your federal tax return, and depending on your state, you may also owe state income tax on it.

The amount of tax you owe depends on your total income and your tax bracket. If you earned $500 in savings interest and you are in the 24% federal tax bracket, you will owe roughly $120 in federal tax on that interest (plus any state tax). This is why the true return on your savings is lower than the APY — the APY is the interest rate, but after taxes, your actual earnings are less.

Some accounts, like certain IRAs or 529 education savings plans, allow interest to grow tax-free or tax-deferred, but a regular savings account offers no tax break. Keep your Form 1099-INT when you receive it and use it to complete your tax return accurately.

Frequently Asked Questions

Why does my bank's savings rate differ from the rate I see advertised online?

Banks set their own rates independently, so even when the Federal Reserve makes the same move, different banks offer different rates to savers. Online banks often offer higher rates because they have lower operating costs. Promotional rates advertised online explore only to new accounts or for a limited time. Your existing account may be earning an older, lower rate unless you specifically moved it or your bank raised rates across all accounts.

If I withdraw money before interest posts, do I lose the interest I earned?

Usually no — most banks pay interest that was calculated even if you withdraw before the posting date. However, some accounts have conditions, such as requiring you to maintain a minimum balance through the posting date to receive that month's interest. Check your account agreement or call your bank to confirm their specific policy before you withdraw.

How much will I earn on $50,000 in a savings account?

It depends on the APY your bank offers and how long you hold the money. At 4.5% APY for one full year, you would earn roughly $2,250 before taxes. At 2% APY, you would earn roughly $1,000. Rates vary by bank and change frequently, so check your bank's current rate and use their interest calculator tool to see what you would earn at your specific balance.

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

Yes, but confirm the timing with both banks. Interest typically posts on a specific date each month. If you move money after interest posts, you receive that month's interest from the old account and start earning at the new rate in the new account. If you move money before interest posts, ask the old bank whether you will still receive the calculated interest. Most will pay it, but it is worth confirming.

What is the difference between a savings account and a money market account?

A money market account typically pays a higher interest rate than a basic savings account at the same bank, but it may require a higher minimum balance and limits how many withdrawals you can make per month. A savings account usually has lower minimums and fewer withdrawal restrictions. Both are FDIC-insured up to $250,000 per depositor per bank.