WASHINGTON – Federal regulators on Thursday adopted sweeping new rules for the credit card industry that will shield consumers from increases in interest rates on existing account balances among other changes.

The rules, which take effect in July 2010, will allow credit card companies to raise interest rates only on new credit cards and future purchases or advances, rather than on current balances.

They were approved Thursday morning by the Office of Thrift Supervision, a Treasury Department division. The Federal Reserve and the National Credit Union Administration were expected to act on them later in the day. The changes mark the most sweeping clampdown on the credit card industry in decades and are aimed at protecting consumers from arbitrary hikes in interest rates or inadequate time provided to pay the bills. (continue reading)

FYI: The new rules prohibit:

• Placing unfair time constraints on payments. A payment could not be deemed late unless the borrower is given a reasonable period of time, such as 21 days, to pay.
• Placing too-high fees for exceeding the credit limit solely because of a hold placed on the account.
• Unfairly computing balances in a computing tactic known as double-cycle billing.
• Unfairly adding security deposits and fees for issuing credit or making it available.
• Making deceptive offers of credit.