(50 ILCS 505/4) (from Ch. 85, par. 5604)
Sec. 4.
Any bill approved for payment pursuant to Section 3 shall be paid within 30 days after the date of approval. If payment is not made within such 30 day period, an interest penalty of 1% of any amount approved and unpaid shall be added for each month or fraction thereof after the expiration of such 30 day period, until final payment is made.
(Source: P.A. 84-731.)