Revenue Procedure 2023-15: Safe Harbor for Utility Property

Revenue Procedure 2024-28 is not a safe harbor for utility property. It is 2024 IRS guidance on allocating cost basis for digital assets across wallets and accounts.¹ The safe harbor that natural gas utilities actually use for pipeline expenditures is Revenue Procedure 2023-15, which sets out when spending on natural gas transmission and distribution property counts as a deductible repair versus a capitalized improvement.² The mix-up between the two numbers is common enough that it is worth confirming before anything reaches Form 3115.

Who Can Use the 2023-15 Safe Harbor

The taxpayer must be a natural gas utility, generally a business that transmits or distributes gas by pipeline under the regulatory oversight of the Federal Energy Regulatory Commission or a state public utility commission. The safe harbor covers linear property only: the pipes, valves, fittings, and connected components that make up the continuous pipeline network.²

Non-linear assets sit outside the safe harbor. Compressor stations, gas processing plants, metering and regulating stations, and underground storage facilities are hubs rather than segments of the network, so expenditures on them still get analyzed under general capitalization rules or other applicable guidance. A utility that mixes station equipment into its linear property calculations risks invalidating the election, so clean classification at the asset-register level matters from the start.

How the Thresholds Work

The safe harbor does not apply one flat percentage to all spending. It sets separate replacement thresholds for transmission property, distribution mains, and small blanket work orders.

Transmission Pipelines

For a unit of linear transmission property, the test is length replaced. Replace more than 10 percent of the unit and the full cost of that replacement must be capitalized. Replace 10 percent or less and the cost is deductible as a repair.²

Distribution Mains

Distribution mains use a distance test instead of a percentage. More than four miles of mains replaced means the cost is capitalized. Four miles or less qualifies as a repair.² Distribution service lines are handled under separate simplified rules within the same revenue procedure.

Blanket Work Orders

Small routine jobs run through blanket work orders get a de minimis path. If the utility maintains a policy capping per-event charges under a blanket work order at $50,000 or less, those replacement costs are deductible regardless of the length or distance thresholds.² This is what keeps the safe harbor workable given the daily volume of minor repairs.

Costs You Must Capitalize No Matter What

Some expenditures are capital by rule, even if they would otherwise fall under the deductible side of a threshold:

Work that increases capacity by more than five percent to one or more existing or potential customers.²
Property needed to add new customers.
Spending that extends the pipeline network beyond what already exists.

These rules stop expansion projects from being routed through the repair deduction. Swapping a corroded two-inch line for a six-inch line that serves a new subdivision is not maintenance, and the safe harbor treats it that way.

Making the Election on Form 3115

The safe harbor is adopted through an accounting method change. File Form 3115, Application for Change in Accounting Method, attached to a timely filed federal income tax return for the year of the change, including extensions. A signed duplicate copy also goes to the IRS National Office in Ogden, Utah, at the address in the Form 3115 instructions.³

If the change qualifies as automatic, there is no user fee and the Commissioner’s consent is treated as granted once the form is properly filed.⁴ The IRS does not acknowledge automatic change filings, so keep certified mail receipts and copies of everything submitted.³ The designated automatic change number for the gas utility safe harbor is specified inside Rev. Proc. 2023-15 and the current list of automatic changes; confirm the number in force for your filing year, because these are updated periodically.

The Section 481(a) Adjustment

Changing methods creates a cumulative difference between what was previously reported and what the new method would have produced. That difference is the Section 481(a) adjustment. To compute it, the utility looks back at prior years, recharacterizes the relevant expenditures under the safe harbor, and measures the net effect on taxable income.

If the safe harbor generates more deductions than were previously claimed, the adjustment is negative and reduces taxable income entirely in the year of change. If it produces fewer deductions (a positive adjustment that raises taxable income), the utility generally spreads that increase over four tax years: the year of change and the next three.⁵ The four-year spread applies to voluntary, taxpayer-initiated changes only; if the IRS imposes the change during an examination, different timing rules apply. Solid historical records matter, because the adjustment amount is a common audit target.

If the IRS Rejects the Change

Filing under the automatic procedures does not shield the safe harbor from later review. If an examiner finds the utility did not meet all requirements, the IRS can adjust the Section 481(a) amount, deny the method change and put the utility on a proper method, or require a reversion to the prior method.⁵

When a change is deemed unauthorized, the IRS also looks at the time-value-of-money benefit the utility received from the incorrect treatment. That assessment can produce restricted interest computations that effectively charge for the years the wrong method was in place.⁵ The examiner can also accelerate the full 481(a) correction into the earliest year under examination rather than allowing the normal four-year spread. For a utility with millions in reclassified spending, that acceleration turns into an immediate tax bill.

Watch the DCN You Use

Some summaries associate Designated Automatic Change Number 272 with the gas utility safe harbor. That is wrong. DCN 272 was established by Revenue Procedure 2024-30 for regulated financial companies changing to the Allowance Charge-off Method for bad debts.⁶ Putting the wrong DCN on Form 3115 can delay processing or trigger a rejection. Verify the correct designated change number in the current version of Rev. Proc. 2023-15 and the latest list of automatic accounting method changes before you file.

1
Internal Revenue Service. Revenue Procedure 2024-28
2
Internal Revenue Service. Revenue Procedure 2023-15
3
Internal Revenue Service. Instructions for Form 3115 – Application for Change in Accounting Method
4
Internal Revenue Service. Revenue Procedure 2015-13
5
Internal Revenue Service. 4.11.6 Changes in Accounting Methods
6
Internal Revenue Service. Revenue Procedure 2024-30