An initial determination is the determination we make about your income-related monthly adjustment amount that is subject to administrative review. For the purposes of administering the income-related monthly adjustment amount, initial determinations include but are not limited to determinations about:

(a) The amount of your income-related monthly adjustment amount based on information provided by IRS; and

(b) Any change in your income-related monthly adjustment amount based on one of the circumstances listed in § 418.1310(a)(1) through (a)(4).