NEW YORK — Shares of Jackson Hewitt Tax Service Inc. tumbled Thursday after the tax-services company said that a unit of Pacific Capital Bancorp wouldn't be able to deliver expected refund-anticipated loans, leaving Jackson Hewitt without 75% of the funding for its program.

Pacific Capital's Santa Barbara Bank & Trust had been expected to match its 2009 contributions to Jackson Hewitt's program, Jackson Hewitt said in a federal filing. But on Sunday, Santa Barbara Bank told Jackson Hewitt it wouldn't be in position to originate the loans for the tax season based "upon a directive received by them from their regulator."

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