Most savings account APYs are variable, meaning the bank can change the rate whenever it wants

A variable APY means your savings account interest rate is not locked in. The bank sets the rate and can raise it or lower it at any time, usually without asking your permission first. Banks are required to notify you before a rate drop takes effect, but the notice often comes after the decision is already made. A fixed APY exists but is rare in savings accounts — it's more common in certificates of deposit (CDs), where you agree to leave money untouched for a set period in exchange for a may provide rate.

The reason most savings accounts use variable rates is that banks themselves borrow money at rates that change constantly. When the Federal Reserve raises or lowers its benchmark interest rate, banks adjust what they pay depositors. A savings account at a large national bank might pay 0.01% APY one month and 0.02% the next, or stay flat for years. Online banks tend to offer higher rates than brick-and-mortar banks, but those rates are also variable.

Key Takeaways

  • Variable APY means the bank can change your interest rate at any time, and you have no control over when or by how much it moves.
  • Banks must notify you before lowering rates, but the notification requirement does not prevent the change or give you the right to refuse it.
  • Your account balance does not change when rates drop — only the interest you earn on future deposits slows down.
  • If you want a may provide rate, a CD locks in a fixed APY for a specific time period, though you cannot withdraw the money early without a penalty.
  • Online banks and credit unions often offer higher variable rates than national banks, but shopping around means comparing rates that may shift within weeks.

How banks decide to raise or lower your rate

Banks do not change rates on a whim. The Federal Reserve sets a target range for the federal funds rate — the interest rate banks charge each other for overnight loans. When the Fed raises that rate, banks have more incentive to offer higher APYs to attract deposits. When the Fed lowers it, banks cut what they pay you. This is why savings account rates tend to move in the same direction across the industry at roughly the same time.

A bank's own funding costs and competitive pressure also matter. If a competitor online bank starts offering 4.5% APY and you're earning 3.5%, your bank might raise its rate to keep you from leaving. Conversely, if deposits are flowing in faster than the bank needs, it may lower rates to reduce costs. Large national banks often pay less than online banks because they have more branches and higher overhead, so they can afford to be less competitive on rate.

What happens to your money when rates change

A rate change does not touch the money already in your account. If you have $10,000 saved and the APY drops from 4% to 3%, you still have $10,000. The drop only affects the interest you earn going forward. On a $10,000 balance, the difference between 4% and 3% APY is about $100 per year, which matters if you're counting on that income.

The timing of a rate cut can feel sudden because banks are not required to give you advance notice before raising rates — only before lowering them. Federal law requires at least 21 days' notice before a rate decrease takes effect, but many banks give more. The notice usually arrives by email or mail and includes the new rate and the date it becomes active. By the time you read it, the decision is already final.

When a fixed rate makes sense instead

A certificate of deposit (CD) offers a fixed APY for a set term — typically three months, six months, one year, or five years. You agree to leave the money untouched until the term ends. In exchange, the bank locks in a rate that will not change, no matter what the Fed does. If you open a one-year CD at 4.5% APY, you will earn 4.5% for the full year, even if rates drop to 2%.

The trade-off is access. If you need the money before the CD matures, you pay an early withdrawal penalty — typically a few months' worth of interest. A six-month CD with a 4.5% APY and a three-month penalty means you lose about 2.25% of the interest you earned if you pull out early. For money you know you won't need for a specific time period, a CD removes the uncertainty of rate changes. For money you might need sooner, a variable-rate savings account keeps your options open.

How to track rate changes on your account

Most banks post their current APY on their website, usually on the savings account product page. The rate shown is what new deposits earn today, but it can change. Some banks update their rates weekly; others hold steady for months. If you want to watch for changes, check your bank's website once a month or set a reminder to compare rates at competitors.

Your monthly or quarterly statement shows the APY that was in effect during that period and the interest you earned. If the rate changed mid-month, the statement may show a blended rate or break out the interest earned at each rate. Reading your statement is the clearest way to see whether your bank has already cut rates without you noticing.

Moving money to a higher-paying account

If your current bank's rate falls behind, you can move money to another bank or credit union. There is no penalty for switching savings accounts — you simply withdraw from one bank and deposit at another. The process takes a few business days if you transfer electronically, or longer if you use a check. Some banks offer a one-time rate bump or bonus to new customers, though these usually come with conditions like maintaining a minimum balance for a set period.

Shopping around every few months makes sense if you have a large balance, because even a 1% difference in APY adds up. On $50,000, the difference between 3% and 4% APY is $500 per year. Online banks and credit unions tend to lead on rates, but they also change rates frequently. Any rate you see today may be different in 30 days, so compare based on current rates, not promises of future ones.

Frequently Asked Questions

Can a bank lower my rate without telling me?

No. Federal law requires banks to notify you at least 21 days before lowering your APY. The notification usually comes by email or mail and includes the new rate and effective date. You cannot stop the change, but you have time to move your money elsewhere if you choose.

If I move my money to a different bank, will that new rate stay the same?

No. The new bank's rate is also variable unless you open a CD. You may find a higher rate today, but it can drop later just like your old account. The advantage is that you can move again if a competitor offers better terms.

Why do online banks pay more interest than big banks?

Online banks have lower overhead — no branches, fewer employees, lower real estate costs — so they can afford to pay more on deposits to compete for your business. Big banks rely on convenience and brand recognition, so they can pay less and still keep customers.

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

APY (annual percentage yield) includes compound interest — interest earned on your interest. APR (annual percentage rate) does not. Savings accounts use APY, so the rate you see already accounts for compounding. The more often interest compounds, the higher your effective return.

Should I put all my money in a CD if rates are high right now?

A CD locks in today's rate, which protects you if rates fall. But if rates rise after you open the CD, you are stuck earning the lower locked-in rate. A mix of CDs and variable savings accounts lets you benefit if rates go up while protecting some money if they fall.