Gas Pipeline Uniform Accounting Regulations

72 In each fiscal period of a company, there shall be debited to account 321 (Amortization of Debt Discount, Premium and Expense), and credited to account 170 (Unamortized Debt Discount and Expense), a portion of each of the debit balances included in account 170 and the calculation of that portion shall be based on the ratio of the fiscal period to the remaining life of the respective securities, calculated from the beginning of the fiscal period to the date of maturity of the debt to which the charges relate, and correspondingly there shall be credited to account 321 (Amortization of Debt Discount, Premium and Expense) and debited to account 270 (Unamortized Debt Premium and Expense), a similar portion of each of the credit balances included in account 270.