403 Depreciation expense.

A. This account shall include the amount of depreciation expense for all classes of depreciable gas plant in service except such depreciation expense as is chargeable to clearing accounts or to account 416, Costs and Expenses of Merchandising, Jobbing and Contract Work.

B. The utility shall keep such records of property and property retirements as will reflect the service life of property which has been retired and aid in estimating probable service life by mortality, turnover, or other appropriate methods; and also such records as will reflect the percentage of salvage and cost of removal for property retired from each account, or subdivision thereof, for depreciable gas plant.

NOTE A: Depreciation expense applicable to property included in account 104, Gas Plant Leased to Others, shall be charged to

account 413, Expenses of Gas Plant Leased to Others.

NOTE B: Depreciation expense applicable to transportation equipment, shop equipment, tools, work equipment, power operated equipment and other general equipment may be charged to clearing accounts as necessary in order to obtain a proper distribution of expenses between construction and operation.

404.1 Amortization and depletion of producing natural gas land and land rights.

A. This account shall include charges for amortization and depletion of producing natural gas land and land rights. (See account 111, Accumulated Provision for Amortization and Depletion of Gas Utility Plant).

B. The charges to this account shall be made in such manner as to distribute the cost of producing natural gas land and land rights over the period of their benefit to the utility, based upon the exnaustion of the natural gas deposits recoverable from such land and land rights.

404.2 Amortization of underground storage land and land rights.

A. This account shall include charges for amortization of land and land rights of underground storage projects for natural gas. (See account 111, Accumulated Provision for Amortization and Depletion of Gas Utility Plant.)

B. The charges to this account shall be made in such manner as to distribute the cost of amortizable land and land rights over the period of their benefit to the utility, and with respect to any land or land rights which inIclude native gas in the storage reservoir, such amounts shall be amortized or depleted on the basis of production of such native gas after the volume of stored gas has been withdrawn from the reservoir.

404.3 Amortization of other limited-term gas plant.

This account shall include amortization charges applicable to amounts included in the gas plant accounts for limited-term franchises, licenses, patent rights limited-term interests in land, and expenditures on leased prop

erty where the service life of the improvements is terminable by action of the lease. The charges to this account shall be such as to distribute the book cost of each investment as evenly as may be over the period of its benefit to the utility. (See account 111, Accumulated Provision for Amortization and Depletion of Gas Utility Plant.)

405 Amortization of other gas plant.

A. When authorized by the Commission, this account shall include charges for amortization of intangible or other gas utility plant, which does not have a definite or terminable life and which is not subject to charges for depreciation expense.

B. This account shall be supported in such detail as to show the amortization applicable to each investment being amortized, together with the book cost of the investment and the period over which it is being written off.

406 Amortization of gas plant acquisition adjustments.

This account shall be debited or credited, as the case may be, with amounts includible in operating expenses, pursuant to approval or order of the Commission, for the purpose of providing for the extinguishment of the amount in account 114, Gas Plant Acquisition Adjustments.

407.1 Amortization of property losses.

This account shall be charged with amounts credited to account 182, Extraordinary Property Losses, when the Commission has authorized the amount in the latter account to be amortized by charges to gas operating expenses.

407.2 Amortization of conversion ex

penses.

This account shall be charged with amortization of amounts authorized by the Commission to be included in Account 186, Miscellaneous Deferred Debits, for expenses incurred in the conversion of distribution plant from manufactured gas service to natural gas service.

408 [Reserved]

Special Instructions, Accounts 408.1 and 408.2. A. These accounts shall include the amounts of ad valorem, gross revenue or gross receipts, taxes, state unemployment insurance, franchise taxes, federal excise taxes, social security taxes, and all other taxes assessed by federal, state, county, municipal, or other local governmental authorities, except income taxes.

B. These accounts shall be charged in each accounting period with the amounts of taxes which are applicable thereto, with concurrent credits to account 236, Taxes Accrued, or account 165, Prepayments, as appropriate. When it is not possible to determine the exact amounts of taxes, the amounts shall be estimated and adjustments made in current accruals as the actual tax levies become known.

C. The charges to these accounts shall be made or supported so as to show the amount of each tax and the basis upon which each charge is made. In the case of a utility rendering more than one utility service, taxes of the kind includible in these accounts shall be assigned directly to the utility department the operation of which gave rise to the tax in so far as a specific utility department, it shall be distributed among the utility departments or nonutility operations on an equitable basis after appropriate study to determine such basis.

NOTE A: Special assessments for street and similar improvements shall be included in the appropriate utility plant or nonutility property account.

NOTE B: Taxes specifically applicable to construction shall be included in the cost of construction.

NOTE C: Gasoline and other sales taxes shall be charged as far as practicable to the same amount as the materials on which the tax is levied.

NOTE D: Social security and other forms of so-called payroll taxes shall be distributed to utility departments and to nonutility functions on a basis related to payroll. Amounts applicable to construction shall be charged to the appropriate plant accounts.

NOTE E: Interest on tax refunds or deficiencies shall not be included in these accounts but in account 419, Interest and Dividend Income, or 431, Other Interest Expense, as appropriate.

408.1 Taxes other than income taxes, utility operating income.

This account shall include those taxes other than income taxes which relate to utility operating income This account shall be maintained so as to allow ready identification of the various classes of taxes relating to Utility

Operating Income (by department), Utility Plant Leased to Others and Other Utility Operating Income.

408.2 Taxes other than income taxes, other income and deductions.

This account shall include those taxes other than income taxes which relate to Other Income and Deductions.

409 [Reserved]

Special Instructions, Accounts 409.1, 409.2 and 409.3. A. These accounts shall include the amounts of local, state and federal income taxes on income properly accruable during the period covered by the income statement to meet the actual liability for such taxes. Concurrent credits for the tax accruals shall be made to account 236, Taxes Accrued, and as the exact amounts of taxes become known, the current tax accruals shall be adjusted by charges or credits to these accounts unless such adjustments are properly includible in account 439, Adjustments to Retained Earnings, so that these accounts as nearly as can be ascertained shall include the actual taxes payable by the utility. (See General Instruction 7.1 for prior period adjustments.)

B. The accruals for income taxes shall be apportioned among utility departments and to Other Income and Deductions so that, as nearly as practicable, each tax shall be included in the expenses of the utility department or Other Income and Deductions, the income from which gave rise to the tax. The income tax effect of amounts recorded in account 439, Adjustments to Retained Earnings, shall be recorded in that account. The tax effects relating to Interest Charges shall be allocated between utility and nonutility operations. The basis for this allocation shall be the ratio of net investment in utility plant to net investment in nonutility plant.

NOTE A: Taxes assumed by the utility on interest shall be charged to account 431, Other Interest Expense.

NOTE B: Interest on tax refunds or deficiencies shall not be included in these accounts but in account 419, Interest and Dividend Income, or account 431, Other Interest Expense, as appropriate.

409.1 Income taxes, utility utility operating income.

This account shall include the amount of those local, state and federal income taxes which relate to utility operating income. This account shall be maintained so as to allow ready