Fall is promo season for savings accounts. Banks want deposits before the year closes, so they dangle boosted rates for six months and hope you never look at the account again once the boost wears off. That second part is where the money leaks out.
Right now there are at least two big examples on the table. E*TRADE (through Morgan Stanley Private Bank) is advertising a guaranteed 4.25% APY for six months on new Premium Savings Accounts opened between September 22, 2026 and January 10, 2027. CIT Bank is running a 4.25% APY boost on its Platinum Savings account through December 15, 2026, sitting on top of a 3.75% standard rate. Both are good deals. Both also come with an expiration date, and what happens after that date matters more than the headline number.
What actually happens when a promo rate expires
Nothing dramatic. That’s the problem. You won’t get a phone call. Per E*TRADE’s own terms, once the six-month promotion period ends, “the rate will automatically revert to the Standard APY without any action required.” CIT works the same way: after each person’s six-month window, the account drops back to whatever CIT’s standard rate is at that moment.
Federal rules generally require a bank to give you 30 days’ notice before changing account terms in a way that hurts you. But under Regulation DD, the Truth in Savings rule, that notice isn’t required for rate changes on variable-rate accounts. Almost every savings account is variable rate. So your bank can lower your APY next Tuesday and the only place you’ll see it is your next interest payment.
If the standard rate you fall back to is still competitive, the drop costs you a little. If it isn’t, it can cost you a lot.
Run the numbers before the boost ends
Let’s say you park $15,000 of emergency savings in a promo account. At 4.25% for six months, you’d earn roughly $319 in interest. When the rate falls to a 3.75% standard APY, that same balance earns about $563 over the following year. That is a small step down, and for most people it’s fine to just stay put.
Now picture a different fallback. According to the FDIC’s national rate data, the average savings account paid 0.37% APY as of September 21, 2026. E*TRADE’s comparison chart lists Bank of America Advantage Savings, Chase Premier Savings, and Wells Fargo Way2Save all at 0.01%. On $15,000, 0.37% works out to about $56 a year. At 0.01%, it’s $1.50. The gap between a decent standard rate and a bad one is more than $500 a year on a pretty ordinary balance.
So the question isn’t really “is the promo good?” It’s “where does this account land when the promo is over, and am I okay with that?”
Read the fine print on how the boost works
Not all boosts are built the same, and the differences change how much you’ll actually earn.
E*TRADE’s offer is fixed. The bank says you “lock in the fixed boosted rate for six months from the date you opened the account, regardless of what happens with the standard rate.” If rates fall this winter, you’re protected until the six months are up. The catch is that it only applies to brand-new Premium Savings Accounts. If you already have one, you’re not eligible.
CIT’s promo floats instead. Its terms say that if the standard APY changes during the promotion, “the APY boost will move with it.” That keeps you above CIT’s standard rate, but your total yield can slide if CIT cuts its base rate. CIT’s offer is open to new and existing customers, which is nice if you already bank there.
Watch the balance tiers too. CIT’s Platinum Savings pays 3.75% only on balances of $5,000 or more. Below that, the rate drops to 0.25%. If you pull your balance down to $4,900 for a car repair, you go from earning about $184 a year to about $12 on that money. That’s a quiet trap, and it has nothing to do with the promo ending.
Set a reminder the day you open the account
This is the cheapest fix there is. When you open a promo account, put a calendar reminder about two weeks before the six-month mark. Write the current standard rate in the reminder so you know what you’re comparing against when it pops up.
When the reminder hits, log in and check three things: your current APY, the bank’s posted standard rate, and what other online banks are paying. Bankrate’s running list of top high-yield savings accounts was showing rates up to 4.25% in October 2026, so you’ll have a quick benchmark. If your account is within a few tenths of a percent of the best options, staying is usually the smart move. Moving money has its own costs, like time, a new login to manage, and a few days with your cash in transit.
When it makes sense to move your money
Moving is worth it when the gap is real. A rough rule we like: if switching would earn you an extra $100 or more a year, it’s worth an hour of your time. On a $10,000 balance, that’s a difference of about 1 percentage point. On $25,000, it’s about 0.4 points.
Some people go further and chase promos every six months. That can work, but go in with eyes open. Many banks limit boosts to new accounts, and cash bonuses usually have strings attached. E*TRADE’s current savings bonus, for example, pays $400 if you bring in $20,000 of net new money and $800 for $100,000 or more, but you have to keep that balance for a 45-day maintenance period. The bank also notes the bonus is reported on a 1099-INT as interest income, so you’ll owe tax on it. If you’re juggling three accounts to squeeze out an extra $40, the hassle may eat the reward.
For most savers, a better setup is boring: one solid high-yield account with a competitive standard rate, not just a flashy intro rate. If you want certainty, a CD can lock a rate for a set term, though you give up easy access to the cash.
Don’t let your emergency fund go stale
Emergency money tends to get forgotten precisely because you’re not supposed to touch it. That’s fine for withdrawals. It’s not fine for the rate. Promo accounts work best when you treat the expiration date as a scheduled check-up, not a surprise.
The good news is that a few minutes of attention twice a year keeps most of the value. Open the promo if it fits your needs, note the date it ends, and check where the rate lands. If the standard rate holds up, enjoy it. If it sinks toward that 0.37% national average, take your money somewhere that pays you to keep it there.
