Wyoming Ad Valorem Tax on Flared Gas: Exemptions and Valuation

In Wyoming, ad valorem tax on flared gas turns on one question: did the Wyoming Oil and Gas Conservation Commission authorize the flaring? Gas flared or vented under WOGCC authority is statutorily deemed to have no value and is exempt from taxation.¹ Gas flared without that authorization is taxable production, even though it was never sold. The Department of Revenue assigns it a value using comparable field prices or a netback calculation, certifies that value to the county, and the county applies its mill levy to produce the actual bill.

When Flared Gas Is Exempt

The core exemption is in Wyoming Statute 39-14-205: natural gas flared or vented under WOGCC authority “has no value and is exempt from taxation.”¹ The same statute exempts gas that is reinjected or consumed before sale to maintain, stimulate, transport, or produce crude oil or natural gas on the same lease or unit where it was produced, and gas consumed on-site to treat produced water for beneficial use in Wyoming.

A newer provision covers gas that would otherwise have been flared under WOGCC authority but is instead consumed on-site. That gas qualifies for exemption as long as the WOGCC certifies it came from a qualifying well.¹

When Flared Gas Is Taxable

Everything else gets taxed. Gas flared because a pipeline tie-in isn’t available, because capture isn’t economic, or for any other reason without WOGCC approval is treated as taxable production, regardless of whether it ever reached a buyer.

The paper trail runs through the WOGCC. Operators must report all flaring monthly, documenting the duration and estimated volume of gas, the circumstances that caused it, whether gas was vented or flared, and the measurement method used.² The Department of Revenue uses those monthly reports to cross-check tax filings. If an operator claims an exemption, the WOGCC authorization has to be on file to back it up. Without it, the volume defaults to taxable status.

How the Department Values Flared Gas

Flared gas that doesn’t qualify for exemption presents an obvious valuation problem: there is no sale price. Wyoming law requires valuation at the point of production, before processing or transportation, using the fair market value of comparable gas sold in the same field.³ When direct comparisons exist, the Department uses them. When they don’t, it turns to alternative methods.

The netback method starts with the price the gas fetched at a downstream point of sale and subtracts the costs of getting it there. For gas the producer did not process itself, deductible costs are transportation expenses and third-party processing fees. For gas processed in a facility the producer owns, deductions include direct processing costs such as labor, maintenance, fuel, chemicals, and environmental compliance expenses, plus a return on investment and transportation costs from the point of valuation to the point of sale. Costs incurred before the statutory point of valuation are not deductible. The Department also uses a proportionate profits method in appropriate cases.⁴ Whichever method applies, the resulting value is what the Department certifies to the county, and the county’s mill levy produces the ad valorem bill.

Reporting and Payment

Natural gas production, including taxable flared volumes, is reported on the Annual Gross Products Return (Form 4201). The form requires identifying the field name and county where production occurred, and flared volumes must be separated from total gas production.⁵ All ad valorem gross products reports must be postmarked or electronically submitted by February 25 of the year following production.⁶

Since January 2020, most mineral producers pay ad valorem taxes monthly rather than in two annual installments. Operators report production by the twenty-fifth day of the second month after the month of production, and payment is due by the twenty-fifth day of the third month after production.⁷ Gas produced in January, for example, is reported by March 25 and paid by April 25.

Smaller producers get an exception. If a taxpayer’s total severance tax liability under Chapter 14 was less than $30,000 for the preceding calendar year, that taxpayer may report annually by February 25 and pay by March 25 of the year following production.⁷ For these producers the county treasurer issues a bill based on the state-certified valuation, and property tax payment dates of November 10 and May 10 may apply to the resulting balance.

Penalties

Failing to file the annual ad valorem report on time can trigger a penalty of one percent of the taxable value of production from the well or property, up to $5,000, for each month or partial month the report is late.⁸ For other required reports and filings, the Department may impose a penalty of up to $1,000. Penalties can be waived for good cause and may be appealed to the State Board of Equalization.

Severance tax carries its own penalty track. Late severance tax returns incur a five percent penalty for each 30-day period the return is overdue, capped at 25 percent of the total tax due.⁸ If a deficiency results from negligence or intentional disregard of the rules, the Department adds five percent of the deficiency plus interest. Operators who discover unreported flared volumes are generally better off filing promptly than waiting for an audit.

Contesting a Valuation

When the Department certifies a taxable value an operator believes is too high, the operator has 30 days from the date the notice was mailed to file a written protest with the county assessor. The protest must explain why the valuation is wrong, identify the property at issue, cite the applicable statute or authority, and describe the relief sought. Vague objections get denied. A credible protest needs supporting documentation: comparable sales data from the same field, evidence of processing costs that should have been deducted, or WOGCC records showing the gas was authorized for flaring and should have been exempt in the first place.

If the protest fails at the county level, the operator can appeal to the Wyoming State Board of Equalization, which reviews mineral tax disputes regularly and has issued decisions addressing valuation methodologies for natural gas production.⁴ Production records, pricing data, and WOGCC documentation should be organized well before the hearing.

Records to Keep

Wyoming’s record retention schedule for the Mineral Tax Division requires production and pricing reports to be retained for three years after an audit or three years after the report’s due date, whichever is later. Audit and examination files must be kept for five years after the audit.⁹ Keeping records longer than the minimum is the safer practice; audits can reach back several years, and an operator who has already destroyed the supporting file has no way to defend a favorable position.

For flared gas specifically, the records that matter are monthly flare volume logs matching what was reported to the WOGCC, daily pricing data from the relevant field, copies of WOGCC flaring authorizations, and the annual gross products return filed with the Department. When an audit identifies a net deficiency, the Department calculates any penalty after first crediting any overpaid gross product or severance tax found within the audit period.⁸ That offset is one of the few taxpayer-friendly features in the penalty statute, and it only helps operators whose records can prove the overpayment.

1
Justia. Wyoming Code 39-14-205 – Exemptions
2
Cornell Law Institute. 055-3 Wyo Code R 3-39 – Authorization for Flaring and Venting of Gas
3
Wyoming Department of Revenue. Mineral Tax Process Overview
4
State of Wyoming State Board of Equalization. State Board of Equalization Docket No 2000-142
5
Wyoming Department of Revenue. Instructions for 4201 – Annual Gross Products for Natural Gas
6
Mineral Tax Division. Mineral Tax Division – FAQs
7
Justia. Wyoming Code 39-13-113 – Monthly Payment of Ad Valorem Tax on Gross Product of Mineral Production
8
FindLaw. Wyoming Code 39-14-208 – Penalties
9
Wyoming State Archives. Record Retention Schedules