Section 6504 - Inability to pay fine and costs(a) Order for installment payments.--Upon plea and proof that a person is unable to pay any fine and costs imposed under this title, a court may, in accordance with 42 Pa.C.S. § 9758 (relating to fine), order payment of the fine and costs in installments and shall fix the amounts, times and manner of payment.(b) Imprisonment for nonpayment.--Any person who does not comply with an order entered under this section may be imprisoned for a number of days equal to one day for each $40 of the unpaid balance of the fine and costs. 1976, June 17, P.L. 162, No. 81, § 1, effective 7/1/1977. Amended 1978, Apr. 28, P.L. 202, No. 53, § 13(25), effective 6/27/1978; 1980, Oct. 5, P.L. 693, No. 142, § 402(b), effective in 60 days; 1990, April 11, P.L. 117, No. 29, § 1, effective in 60 days.