What are the accounts; Amortization Expense and Accumulated Amortization classified as, respectively? Amortization Expense is a contra asset; Accumulated Amortization is an expense Amortization Expense is an expense: Accumulated Amortization is a contra asset Amortization Expense is revenue: Accumulated Amortization is an asset Amortization Expense is an asset; Accumulated Amortization is an contra liability