35 ILCS 5/507U

The Department shall print on its standard individual income tax form a provision indicating that if the taxpayer wishes to contribute to the Prostate Cancer Research Fund, as authorized by this amendatory Act of the 91st General Assembly, he or she may do so by stating the amount of the contribution (not less than $1) on the return and that the contribution will reduce the taxpayer's refund or increase the amount of payment to accompany the return. Failure to remit any amount of increased payment shall reduce the contribution accordingly. This Section shall not apply to any amended return.