JPMorgan Chase & Co has come to a tentative agreement to pay $110 million to settle an overdraft fee class action, according to papers filed in federal court on Friday.

Plaintiffs accused Chase and more than 30 other banks of processing customers' debit card transactions in a way to wrongfully maximize overdraft fees.

Specifically, the banks processed debit card transactions not in the order in which customers conducted them but instead from the highest-to-lowest transaction balances; the change allegedly caused customers to drain their accounts quickly and maximized the overdraft fees assessed against them.

The case was brought in U.S. District Court for the Southern District of Florida.

"Chase made enormous profits from overdraft charges, much of it taken from Chase's most vulnerable customers," the class action claims. The bank generated $500 million a year in post-tax income from high-to-low re-sequencing, according to Chase's own analysis.

As cover for its actions, plaintiffs allege, Chase falsely maintained that it had chosen high-to-low processing because consumers requested it. The opposite was true; Chase logged almost 10,000 complaints monthly about its overdraft fees and re-sequencing, according to internal records of complaints.

The deal cut by Chase is only "a preliminary understanding," according to the filing. It is subject to additional negotiation and the approval of U.S. District Judge Lawrence King, who is overseeing dozens of consolidated overdraft cases from around the country.

"We are pleased to have reached an agreement in principle," a Chase spokesperson wrote in an e-mail. Plaintiffs attorneys did not respond to a request for comment on Friday.

Defendants in the overdraft litigation have generally fared poorly. Bank of America Corp. last year became the first to come to an settlement, agreeing to pay more than $410 million, or around 10% of the overdraft fees it is alleged to have wrongfully charged. Subsequent settlements have recovered as much as 60% of estimated wrongful overdraft revenues. A dozen banks have either settled or are seeking to get settlements approved.

Chase's proposed settlement appears relatively favorable to the bank, given that the $110 offered is just 22% of its alleged earnings from wrongful overdraft fees. One factor that likely worked in Chase's favor was a mandatory arbitration clause in its consumer contracts. Judge King ruled that Chase had failed to assert its right to arbitration in a timely fashion, but the bank was in the process of appealing that ruling. A Chase victory in its appeal  likely wouldhave killed the class action entirely.

Elsewhere, banks are under pressure to restrain overdraft fees. Revenue from them fell by $3.6 billion to $29.5 billion in 2011, while the median fee customers paid per overdraft rose a record $2.50 to $30.

After a decade long run, banks have largely abandoned high-to-low debit processing under pressure from consumer advocates and regulators. Federal rules have restricted banks' ability to charge customers for overdrawing checking accounts, unless the customers "opt in" to programs that will cover their excess charges for a fee. At the same time, banks have had to overhaul some of their checking and debit-card operations to comply with other federal regulations.

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