Banks are stuffing mailboxes once again with 0% introductory APR credit card offers, but this time around they’ve got higher fees for doing the initial balance transfer, rising from 3% in ’09 to 4% in ’10.

And the longer the introductory period, the higher the rate, up to 5% for a 14-month period.

“So before you take the zero percent bait,” writes Consumer Reports Money blog, “do the math to see what it’s going to cost you in fees if you’re transferring a balance.”

New 0-percent credit card offers are in the mail, but with higher fees [Consumer Reports Money Blog]

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