In connection with the acquisition of certain assets of Walter Energy consummated on March 31, 2016, we acquired deferred tax assets primarily associated with federal and state NOLs attributable to Walter Energy's write-off of its investment in Walter Energy Canada Holdings, Inc. As of December 31, 2024, we have utilized all of our federal NOLs and federal general business credit carryforwards and we had state NOLs of approximately $945.2 million.
On February 12, 2021, the Alabama Governor signed into law Alabama House Bill 170, now Act 2021-1 (the "Act"). The Act makes several changes to the state's business tax structure. Among the provisions of the Act, is the repeal of the so-called corporate income tax "throwback rule." That rule required all sales originating in Alabama and delivered to a jurisdiction where the seller was not subject to tax, to be included in the seller's Alabama income tax base. Thus, prior to repeal of the throwback rule, we had to rely on our Alabama NOL carryforwards to shelter taxes imposed under such throwback rule. As a result of the now repealed throwback rule, effective January 1, 2021, all such sales should now be excluded from Alabama taxable income without the need to utilize Alabama NOLs. As a result of the repeal of the throwback rule, we determined that it is not more likely than not that we would have sufficient taxable income to utilize all of our Alabama deferred income tax assets prior to expiration. Therefore, at December 31, 2024, we have a valuation allowance against our state deferred income tax assets of approximately $44.7 million.
Certain factors could change or circumstances could arise that could further limit or eliminate the amount of the available federal and state NOLs to the Company, such as an ownership change, an adjustment by a tax authority or changes in state and federal tax legislation. Also, certain circumstances, including our failing to generate sufficient future taxable income from operations, could limit our ability to fully utilize our deferred tax assets. Under the Internal Revenue Code of 1986, as amended (the "Code"), and similar state laws, a company is generally allowed a deduction for federal and state NOLs against its federal and state taxable income. At December 31, 2024, these state NOLs represent a deferred tax asset of approximately $4.1 million, net of the valuation allowance.
Our federal and state NOLs are subject to adjustment on audit by the Internal Revenue Service (the "IRS") and state authorities. The IRS has not audited any of the tax returns for any of the years in which the losses giving rise to the federal and state NOLs were generated. Were the IRS to challenge the size or availability of our federal and state NOLs and prevail in such challenge, all or a portion of our federal and state NOLs, or our ability to utilize our federal and state NOLs to offset any future taxable income, may be impaired, which could have a significant negative impact on our financial condition, results of operations and cash flows.
A company's ability to deduct its federal and state NOLs and utilize certain other available tax attributes can be substantially constrained under the general annual limitation rules of Section 382 of the Code if it undergoes an "ownership change" as defined in Section 382 or if similar provisions of state law apply. We experienced an ownership change in connection with the acquisition of certain assets of Walter Energy and as such, the limitations under Section 382 would generally apply unless an exception to such rule applies. An exception to the limitation rules of Section 382 is applicable to certain companies under the jurisdiction of a bankruptcy court. Due to certain uncertainties as to whether such exception applies to us, we filed a request for a private letter ruling from the IRS on these points.
On September 18, 2017, the IRS issued to us a private letter ruling, which favorably resolved these uncertainties. Based on such private letter ruling, we believe that there is no current limitation under Section 382 on the utilization of our federal NOLs to shield our income from federal taxation and that a similar analysis would be applied to our state NOLs. The private letter ruling was issued based on, among other things, certain facts and assumptions, as well as certain representations, statements and undertakings provided to the IRS by us. If any of these material facts, assumptions, representations, statements or undertakings are, or become, incorrect, inaccurate or incomplete, the private letter ruling may be invalidated and our ability to rely on the conclusions reached therein could be jeopardized.
While we do not believe an ownership change has occurred since April 1, 2016, because the rules under Section 382 are highly complex and actions of our stockholders which are beyond our control or knowledge could impact whether an ownership change has occurred, we cannot give you any assurance that another Section 382 ownership change has not occurred or will not occur in the future. As a result of our qualifying for the aforementioned exception, were we to have undergone a subsequent ownership change prior to April 1, 2018, our federal and state NOLs would effectively be reduced to zero. An ownership change after such date would severely limit our ability to utilize our federal and state NOLs and other tax attributes.
Certain transactions, including public offerings by us or our stockholders and redemptions may cause us to undergo an "owner shift" which by itself or when aggregated with other owner shifts that we have undergone or will undergo could cause us to experience an ownership change. Our certificate of incorporation contains transfer restrictions (the "382 Transfer Restrictions") to minimize the likelihood of an ownership change. See "-Risks Related to the Ownership of Our Common Stock"-Our common stock is subject to the 382 Transfer Restrictions under our certificate of incorporation and the Amended Rights Agreement which are intended to prevent a Section 382 "ownership change," which if not complied with, could result in the forfeiture of such stock and related distributions or substantial dilution of the stock ownership, respectively. Accordingly, this may impact the market price of our common stock and discourage third parties from seeking strategic transactions with us that could be beneficial to our stockholders." The 382 Transfer Restrictions were originally set to expire in April 2020. Pursuant to the first amendment to the certificate of incorporation approved by the Company's stockholders at the Company's Annual Meeting of Stockholders held on April 23, 2019, the Company effected a three-year extension of the 382 Transfer Restrictions until April 19, 2023, which became effective on March 18, 2020 upon the filing of a certificate of amendment setting forth such amendment with the Secretary of State of the State of Delaware. Pursuant to the second amendment to the certificate of incorporation approved by the Company's stockholders at the Company's Annual Meeting of Stockholders held on April 26, 2022, the Company effected a further extension of the 382 Transfer Restrictions until April 19, 2026. In addition, on February 14, 2020, we adopted an NOLs rights agreement, which was amended on March 4, 2022 and December 8, 2023 (the "Rights Agreement," and as amended, the "Amended Rights Agreement"), to supplement the 382 Transfer Restrictions through April 19, 2026 and increase the exercise price, respectively. See "Part II, Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations-Amended Rights Agreement." We may engage in transactions or approve waivers of the 382 Transfer Restrictions or the Amended Rights Agreement that may cause an ownership shift. In doing so, we expect to first perform the calculations necessary to confirm that our ability to use our federal and state NOLs and other federal and state income tax attributes will not be affected or otherwise determine that such transactions or waivers are in our best interests. For example, under certain circumstances, the Board may determine it is in our best interest to exempt certain transactions from the operation of the 382 Transfer Restrictions and the Amended Rights Agreement, if such transaction is determined not to be detrimental to the utilization of our federal and state NOLs or otherwise in our best interests. These calculations are complex and reflect certain necessary assumptions. Accordingly, it is possible that we could approve or engage in a transaction involving our common stock that causes an ownership change and impairs the use of our federal and state NOLs and other federal and state income tax attributes. For more information, see "-Risks Related to the Ownership of Our Common Stock-We could engage in or approve transactions involving our common stock that adversely affect significant stockholders and our other stockholders."