PARSIPPANY, N.J. - A tough year for Jackson Hewitt Tax Services may get tougher as the tax preparation chain, which said it would likely breach financial covenants in its credit facility, said it may not be able to refinance a $25 million term loan payment at the end of April. The company has classified the $25 million as a current obligation. It would need an amendment to the credit facility or waiver of any default or Jackson Hewitt would need to classify the $364 million  balance outstanding under the credit facility as a current portion of long-term debt.