(a) General rule.--If a payment plan agreement exists between an employer or claimant and the department for a liability for which the employer or claimant is seeking amnesty, the employer or claimant shall pay the amount or amounts required by section 1505¹ during the amnesty period in order to receive amnesty, notwithstanding any terms of the agreement to the contrary.

(b) Proceedings.--The department shall not commence any administrative or judicial proceeding against an employer with regard to any contributions, reimbursement, interest or penalty paid under the program, or any interest or penalties waived under the program. The department shall not commence any administrative or judicial proceeding against a claimant with regard to any overpayment or interest paid under the program or any overpayment or interest waived under the program.

(c) Liabilities.--If a liability for contributions described in section 1503(a)(2)² or liability for an overpayment described in section 1503(b)(3) is disclosed and paid under the program, and the department determines that the liability as disclosed was understated, the department may commence administrative or judicial proceedings and impose interest, penalties and other monetary obligations only with regard to the difference between the liability as disclosed and the correct amount of the liability.

(d) Construction.--Except as provided in subsection (c), nothing in this article shall be construed to prohibit the department from commencing administrative or judicial proceedings and imposing interest, penalties and other monetary obligations with respect to any liability that is not disclosed under the program or any amount that is not paid under the program.

(e) Refunds and credits.--An employer or claimant shall not be owed a refund or credit under this article for any amount paid prior to the amnesty period.

(f) Restrictions.--An employer or claimant may not commence an administrative or judicial proceeding with regard to the amnesty form, any report filed in connection with the program, any liability disclosed under the program or any amount paid under the program, and shall not be owed a refund or credit for any amount paid under the program.