Your Card Rate Went Up Thursday. On the Balance You Already Owed.

If you are carrying a credit card balance, your interest rate went up on Thursday. Not on your next purchase. On the money that was already sitting there.

No letter came. None was required.

The Federal Open Market Committee voted 12-0 on September 16 to raise its target range by a quarter point, to 3-3/4 to 4 percent. The statement did not hedge: “Inflation remains elevated. Today’s policy action will support a timelier return to the Committee’s 2 percent goal.” The next morning the big banks moved the prime rate to 7.00% from 6.75%. Bank of America’s own rate page shows the change effective September 17. Prime had not moved since December 11, 2025.

Almost every general-purpose card prices off prime. Your agreement says something like prime plus 14.99%. Prime moved, so you moved.

Here’s the part nobody mentions when they explain that the Fed does not set your card rate. There is a rule that says an issuer cannot raise the APR on your account. It is Regulation Z, section 1026.55(a), and it is one of the better things the CARD Act did. It also has an exception written directly into it. Section 1026.55(b)(2) lets the increase through when the rate varies “according to an index that is not under the card issuer’s control and is available to the general public” and the increase comes from a rise in that index.

Prime is that index. And section 1026.9(c)(2)(v)(C) excuses the issuer from the 45-day advance notice for exactly the same kind of increase.

So: no warning, no opt-out, and it applies to debt you took on months ago under a different number.

Now the honest part. A quarter point is not an emergency. The Fed’s G.19 release puts the average rate on card plans at 20.94% across all accounts and 22.15% on accounts actually assessed interest in the second quarter. On a $6,000 balance, 25 basis points is roughly $15 a year. That is a sandwich.

The damage is to your plan, not your statement.

For most of two years the standard advice on card debt quietly assumed rates were headed down, so carrying a balance a while longer was a cost you could wait out. The Committee’s own projections just took that away. The median participant now puts the federal funds rate at 4.1% at the end of 2026, against a midpoint of 3.875% today. That is one more hike as the middle expectation. The 2027 median is 4.1% again.

Translation: nobody is coming to make your balance cheaper.

So stop pricing the payoff against a cut that has no schedule. Pull up your statement, find the APR that posts this cycle, and run the real balance through our debt payoff calculator at that number. Whatever it tells you is the plan, because the rate is not the variable you get to negotiate here. The balance is.

If you are shopping a transfer, a stated 0% for a stated number of months is fixed for that window, which is precisely the protection the variable exception strips out. Compare what is actually on offer on our best credit cards page and read the go-to rate, not the teaser.

Pay it down at the rate you have. That is the whole move.

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