Amazon’s Prime Big Deal Days runs October 6 and 7 this year, a 48-hour sale that Amazon itself calls the kickoff to holiday shopping. New deals drop three times a day, and the whole thing is built to make you decide fast. That’s exactly when a little button in your credit card app starts to look friendly: split this purchase into equal monthly payments, no interest.
Almost every big card issuer has one now. American Express calls it Plan It. Chase calls it Pay Over Time (it used to be My Chase Plan). Citi has Flex Pay, Bank of America has the Custom Pay Plan, and U.S. Bank has ExtendPay. They feel like a smarter version of buy now, pay later, because you stay on a card you already have and keep earning rewards.
The “no interest” part is true. The “free” part isn’t. Every one of these plans charges a monthly fee, and once you convert that fee into an annual rate, some plans are a decent deal and some are worse than just carrying a balance.
How these plans work
The mechanics are similar across issuers. You make a purchase on your card, then log in and pick an eligible transaction. Amex and Chase require purchases of $100 or more; Citi’s minimum is $75. You’ll see a few plan lengths, usually somewhere between 3 and 24 months depending on the issuer, each with a fixed monthly fee. Pick one, and that month’s installment plus the fee gets added to your minimum payment.
According to NerdWallet’s roundup of issuer plans, there’s no hard credit pull to set one up, and you can pay a plan off early without a penalty. You also can’t change a plan after you enroll. Amex and Chase cap you at 10 active plans. U.S. Bank doesn’t cap the number of ExtendPay plans but limits you to using 50% of your credit limit on them.
The fee is where it gets personal. Issuers set it based on the plan length, the purchase size, and the APR you’d otherwise pay. Bank of America is the only one in NerdWallet’s list that publishes a ceiling: its Custom Pay fee will never exceed 1.72% per month.
Turn the fee into an APR before you click
A monthly fee of well under 1% sounds tiny. The catch is that the fee is figured on the original purchase amount, and it stays the same every month even as you pay the balance down. By month 11 of a 12-month plan, you owe very little, but you’re still paying the same fee you paid in month one. That pushes the real cost up.
A CNBC Select reporter published the plan offers from her own accounts for a $100 purchase, and they make a good test case. We ran those numbers through a standard loan calculation to find the equivalent APR.
Her Amex 12-month offer charged $0.72 a month, or $8.64 total. That works out to roughly a 15.6% APR. The 3-month Amex plan, at $0.57 a month, came to about 10.2%. Her Chase offers were far cheaper: $0.32 a month on a 9-month plan, which is roughly 6.9%, and $0.23 a month on a 3-month plan, about 4.1%.
Now look at Bank of America’s cap. A fee of 1.72% a month on a 12-month plan works out to about 36% APR. Nobody is guaranteed to be offered the maximum, but it tells you how wide the range is. The same button can be a bargain or one of the most expensive ways to borrow on your card.
For comparison, Bankrate puts the average credit card rate at 19.61% right now. So a plan in the single digits beats revolving the balance handily. A plan in the mid-teens barely beats it. Anything above your card’s APR loses.
What that looks like on a real purchase
Say you grab a $600 robot vacuum or TV during the sale. Using that same Amex fee rate of 0.72% a month over 12 months, you’d pay about $54 a month and roughly $52 in total fees.
If you skipped the plan and paid the $600 off in 12 equal payments on a card charging 19.61%, you’d pay around $66 in interest. The plan saves you about $14. That’s real, but it’s not the “free financing” feeling the app gives you.
And if you’d saved $50 a month for a year and then bought the thing, the financing cost would be zero. Plus your savings would have earned a bit of interest in a high-yield account along the way. We know that’s not how sales work (the price is only good for 48 hours), but it’s worth asking whether you’d buy this item at full price in six months. If the honest answer is no, the discount is mostly an excuse.
When a plan makes sense
These plans aren’t a scam. For someone who already knows they’ll carry a balance, a low-fee plan is a straightforward improvement. It locks in a fixed payoff date and a known cost, and it’s usually cheaper than your card’s APR. Some people also like the structure: a plan forces the balance to zero on schedule, while a revolving balance can drift for years.
The plan makes the most sense when your offered fee converts to an APR well below your card’s rate, when the purchase is something you needed anyway (a replacement washer, not a fourth pair of earbuds), and when the monthly installment fits your budget without squeezing savings.
When to skip it
Skip it if you’d have paid the card in full anyway. Adding a fee to a purchase you could have covered is paying for nothing.
Be careful about stacking plans, too. Ten plans at once is allowed, and a handful of “small” monthly installments adds up fast during the holidays. Each one raises your minimum payment, and a missed payment brings the usual late fees and credit damage. Plan balances also sit on your card, so they still count against your credit limit.
Finally, compare the fee with a 0% intro APR card if you qualify. A true 0% promotion with no plan fee beats any installment plan, as long as you pay it off before the promo ends. That comparison matters more for bigger purchases where fees add up.
A five-minute check before the sale
Before October 6, log in to your card account and look for the plan options. Chase, for one, lets you estimate plan offers on its dashboard before you buy. Note the monthly fee and the plan length, then plug them into an online loan calculator or simply compare total fees to what your card’s APR would charge over the same months. Write down your card’s current APR while you’re there.
Then set a sale budget, in dollars, and decide how you’ll pay for it before the deals start dropping. If the budget comes from money you already have, you won’t need the button at all. If it doesn’t, you’ll at least know whether the plan you’re offered is a fair loan or an expensive one.
