It’s bill-collecting season, the time of year when law firms gently remind their corporate clients that payment for legal services is due. But while this end-of-year ritual is as customary as the holiday party at most firms, there’s a sense of anxiety surrounding this year’s drive, as partners nervously eye their stacks of outstanding receipts.

“The difference this year is that the combination of the economy and Sept. 11 is going to make people a little more concerned about whether clients will have the cash to pay for legal services,” says Heller Ehrman White & McAuliffe Chairman Barry Levin.