Section 367.4280 - Account 428, Amortization of debt discount and expense(a) This account must include the amortization of unamortized debt discount and expense on outstanding long-term debt. Amounts charged to this account must be credited concurrently to accounts 181, Unamortized debt expense (§ 367.1810 ), and 226, Unamortized discount on long-term debt-Debit (§ 367.2260 ) .(b) This account must be kept or supported so as to show the debt discount and expense on each class and series of long-term debt.