373. Notwithstanding any Act to the contrary, every municipal corporation or municipality shall pay to the school board the contributions or subsidies that stand in lieu of the school tax within 15 days of their receipt.
Where a municipal corporation or a municipality receives a partial payment, it shall, within the same time limit, pay a part of that payment to the school board proportionate to the ratio between the amount owing as school tax and the total claim.
Every amount remitted after the time limit bears interest at the rate prescribed in the fourth paragraph of section 372.