divestitures and redeem the senior notes. The only financial covenants are the maintenance of a leverage ratio of less than 3.5 to 1.0, and an adjusted current ratio of at least 1.0 to 1.0. We were in compliance with the covenants as of September 30, 2025.
On October 10, 2025, we entered into an agreement with an unaffiliated third party to sell certain producing wells and undeveloped leasehold acreage in East Texas for $430 million in cash, subject to adjustment and customary closing conditions. The sale is expected to close in the fourth quarter of 2025 and has an effective date of October 1, 2025. We intend to use the net proceeds from the divestiture to reduce long-term debt.
Federal and State Taxation
At September 30, 2025, we had $743.0 million in U.S. federal net operating loss ("NOL") carryforwards and $1.8 billion in certain state NOL carryforwards. As a result of the change of control in August 2018, our ability to use NOLs to reduce taxable income is limited. If we do not generate a sufficient level of taxable income prior to the expiration of the pre-2018 NOL carryforward periods, then we will lose the ability to apply those NOLs as offsets to future taxable income. We estimate that $740.6 million of the U.S. federal NOL carryforwards and $1.2 billion of the estimated state NOL carryforwards will expire unused.
Our federal income tax returns for the years subsequent to December 31, 2020 remain subject to examination. Our income tax returns in major state income tax jurisdictions remain subject to examination for various periods subsequent to December 31, 2021. Currently, we are under examination with the United States Internal Revenue Service and the state of Louisiana and believe that our significant filing positions and deductions will be sustained under audit or the final resolution will not have a material effect on the consolidated financial statements. Therefore, we have not established any significant reserves for uncertain tax positions.
In July 2025, the One Big Beautiful Bill Act ("OBBBA") was signed into United States federal law. We expect to benefit from certain provisions contained in the OBBBA, including increased interest expense deductions and bonus depreciation and have included these expected benefits in our income tax provision for the three and nine months ended September 30, 2025.
ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISK
Natural Gas and Oil Prices
Our financial condition, results of operations and capital resources are highly dependent upon the prevailing market prices of natural gas and oil. These commodity prices are subject to wide fluctuations and market uncertainties due to a variety of factors, some of which are beyond our control. Factors influencing natural gas and oil prices include the level of global demand for oil, the foreign supply of natural gas and oil, the effect of the war in Ukraine and the geopolitical response to Russia's invasion, the establishment of and compliance with production quotas by oil exporting countries, weather conditions that determine the demand for natural gas, the price and availability of alternative fuels and overall economic conditions. It is impossible to predict future natural gas and oil prices with any degree of certainty. Sustained weakness in natural gas and oil prices may adversely affect our financial condition and results of operations and may also reduce the amount of natural gas and oil reserves that we can produce economically. Any reduction in our natural gas and oil reserves, including reductions due to price fluctuations, can have an adverse effect on our ability to obtain capital for our exploration and development activities. Similarly, any improvements in natural gas and oil prices can have a favorable impact on our financial condition, results of operations and capital resources.
As of September 30, 2025, we had natural gas price swaps to hedge approximately 50.1 Bcf of our 2025 natural gas production at an average price of $3.48 per MMBtu and approximately 116.8 Bcf of our 2026 production at an average price of $3.51 per MMBtu. We also had natural gas collars to hedge approximately 13.8 Bcf of our 2025 natural gas production at an average ceiling price of $3.80 and an average floor price of $3.50 and 167.9 Bcf of our 2026 production at an average ceiling price of $4.35 and an average floor price of $3.50. None of our derivative contracts have margin requirements or collateral provisions that could require funding prior to the scheduled cash settlement date.
An increase of 10% in the market price of natural gas on September 30, 2025 would decrease the fair value of our natural gas price swaps and collars by approximately $91.7 million. A decrease of 10% in the market price of natural gas on September 30, 2025 would increase the fair value of our natural gas price swaps and collars by approximately $91.5 million. The impact of hypothetical changes in market prices of natural gas on our natural gas derivative financial instruments does not include the offsetting impact that the same hypothetical changes in market prices of natural gas may have on our physical sales of natural gas. Since our outstanding natural gas derivative financial instruments hedge only a portion of our forecasted physical gas production, a positive or negative impact to the fair value of our natural gas derivative financial instruments would be partially offset by our physical sales of natural gas.