Talbott said that only a small percentage of consumers have seen their credit card interest rates rise to compensate for the card companies' increased costs, although he could not provide an exact number. Overall, he said, about 10 percent of the country's more than 20 million credit card holders have seen their rates increase this year.
Credit.com's Detwiler said the companies have been too quick to raise their rates. The increases, she added, are discouraging some consumers from paying off their loans.
"These high punitive interest rates are going to push more people into default," she said. "It's almost a vicious circle because people see their interest rate go up, they reach a point where they realize they can't pay that credit card bill off ... and at that point, they give up."
Here are some other rules announced today:
Credit card bills may be mailed or delivered no later than 21 days before a payment due date.
Changes in payment allocation: Borrowers who have different interest rates on different portions of their credit card balances may be able to pay off the portions with higher interest rates first.
New limits on fees attached to "subprime" credit cards given to borrowers with poor credit.
New restrictions on over-the-limit fees.