How often APY changes depends entirely on the account: on a variable-rate savings or money market account, the bank can adjust your rate at any time and without advance notice, sometimes more than once in a single month; on a fixed-rate certificate of deposit, the APY is locked in for the entire term and does not change at all. The clearest external rhythm for variable rates is the Federal Open Market Committee’s schedule of eight meetings a year, but your own bank’s need for deposits and its competitive position matter too.
Change Frequency by Account Type
Variable-Rate Savings and Money Market Accounts
High-yield savings and money market accounts carry variable APYs. Your bank can raise or lower the rate whenever it chooses, based on market conditions or its own financial goals. You might see 4.50% one week and 4.25% the next, with no change in your balance and no warning ahead of time. There is no cap on how often this can happen. The trade-off for that volatility is liquidity: you can generally withdraw without penalty, but you have no protection when rates fall.
Fixed-Rate CDs
A standard certificate of deposit locks your APY for the full term, which can run from a few months to several years.1Consumer Financial Protection Bureau. What Is a Certificate of Deposit (CD)? Whatever the Fed does after you open the CD, your rate stays put. In exchange, you give up easy access to the money: pulling funds out before maturity triggers an early withdrawal penalty, commonly 60 to 365 days of interest depending on the bank and the length of the CD.
Bump-Up and Step-Up CDs
Two specialty CDs sit between the extremes. A bump-up CD lets you request a rate increase during the term if your bank has raised its posted rates since you opened the account. Most allow only one bump over the full term, and you have to ask; it is not automatic. A step-up CD has scheduled increases built into the terms from the start, so the APY rises at predetermined intervals without any action on your part. Both cap how many times the rate can move and in which direction.
What Triggers a Rate Change
The single largest driver of variable APY movement is the federal funds rate, which the FOMC sets as a target range for overnight lending between banks.2Federal Reserve Bank of New York. Effective Federal Funds Rate The FOMC meets on a regular schedule of eight times a year, roughly every six to seven weeks, with additional meetings possible if conditions warrant.3The Federal Reserve. FOMC Calendars and Information As of January 2026, the target range sits at 3.50% to 3.75%.4The Federal Reserve. The Fed Explained – Accessible Each meeting is a moment when the APY on a variable account may shift, whether the Fed acts or holds steady.
Adjustments of 25 to 50 basis points are typical. Because banks’ own cost of money moves with the benchmark, they change what they pay depositors to protect their margins.
Bank-specific factors add another layer. An institution preparing to fund a wave of new loans may push its APY higher to pull in deposits, even without a Fed move. A bank flush with cash may hold its rate low to keep interest expense down. That is why two banks can post noticeably different APYs on nearly identical products at the same time.
Promotional or “teaser” rates are a separate category to watch. These elevated APYs typically last a few months and then drop to the bank’s standard rate, which may be significantly lower. Before opening an account for a headline number, check what the rate reverts to after the introductory period ends. That reverted rate is what you will actually earn.
How Quickly Banks Move After a Fed Decision
No rule requires a bank to change deposit rates within any specific number of days after a Fed announcement. Adjustments usually happen gradually rather than in a single step. Banks tend to act quickly on cuts, because lowering APYs trims their interest expense right away. When the Fed raises rates, banks often wait longer to pass the benefit along, letting the wider margin sit until competitive pressure forces them to match the market.
Online-only banks generally respond faster than traditional ones. Without branch overhead, they lean on attractive APYs to bring in customers, and when a competitor raises its rate, others often follow within days to stay near the top of comparison rankings. Traditional banks, which rely more on branch convenience and long-standing relationships, tend to move more slowly.
Notice You Are Entitled To
Regulation DD, which implements the Truth in Savings Act, governs how banks communicate rate changes. At account opening, the bank must tell you that the interest rate and APY on a variable-rate account may change.5eCFR. 12 CFR Part 1030 – Truth in Savings (Regulation DD) After that, the bank does not have to give you advance notice before lowering your variable APY. You may only find out when you check your online dashboard or read your next periodic statement.
The rules are stricter for non-rate changes that work against you. To raise a monthly maintenance fee or impose a new charge, a bank must send notice at least 30 calendar days before the change takes effect.6eCFR. 12 CFR 1030.5 – Subsequent Disclosures That protection does not extend to APY reductions.
How to Catch a Change
Because rate cuts on variable accounts can arrive without notice, the practical defense is monitoring. Check your periodic statements, turn on rate-change alerts if your bank offers them, and log in to your online dashboard from time to time to compare the current APY against what you had when you opened the account. If your bank has dropped its rate meaningfully below competitors, moving your balance is usually straightforward, since variable savings and money market accounts are liquid by design.
For a CD, none of this applies during the term. The moment that matters is maturity, when many banks will automatically roll the balance into a new CD at the then-current rate unless you act during a short grace period. Mark the maturity date and decide before it arrives whether to renew, move to a different term, or shift the money into a savings account.