By Dow Jones Newswires-Wall Street Journal
Posted Aug. 23 at 6:22 a.m.

Interest rates continue to tumble for the U.S. Treasury, companies and home buyers alike. But for a large portion of 381 million U.S. credit-card accounts, borrowing rates have been moving only one way: up.

And average rates are likely to climb further soon. New credit-card rules that took effect Sunday limit banks’ ability to charge penalty fees. They come on top of rule changes earlier this year restricting issuers’ ability to adjust rates on the fly. Issuers responded by pushing card rates to their highest level in nine years.

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