While we believe our tax positions and reserves are reasonable, the resolutions of certain tax issues related to a past transaction of Tribune are unpredictable and could negatively impact our effective tax rate, net income or cash flows for the period or periods in question. Specifically, we may be faced with additional tax liabilities as a result of our acquisition of Tribune for the transactions contemplated by an agreement, dated August 21, 2009, between Tribune and Chicago Entertainment Ventures, LLC (formerly Chicago Baseball Holdings, LLC) ("CEV LLC"), and its subsidiaries (collectively, "New Cubs LLC"), governing the contribution of certain assets and liabilities related to the business of the Chicago Cubs Major League Baseball franchise then owned by Tribune and its subsidiaries to New Cubs LLC, and related agreements thereto (the "Chicago Cubs Transactions"). We may also be faced with tax liabilities as a result of the federal income tax audits of Tribune for taxable years 2014 and 2015.
On June 28, 2016, the Internal Revenue Service ("IRS") issued Tribune a Notice of Deficiency which presented the IRS's position that the gain with respect to the Chicago Cubs Transactions should have been included in Tribune's 2009 taxable income. Accordingly, the IRS proposed a $182 million tax and a $73 million gross valuation misstatement penalty. During the third quarter of 2016, Tribune filed a petition in U.S. Tax Court to contest the IRS's determination. After-tax interest on the aforementioned proposed tax and penalty through December 31, 2024 would be approximately $232 million. In addition, if the IRS prevails in its position, under the tax rules for determining tax basis upon emergence from bankruptcy, the Company would be required to reduce its tax basis in certain assets. The reduction in tax basis would be required to reflect the reduction in the amount of the Company's guarantee of the New Cubs partnership debt which was included in the reported tax basis previously determined upon emergence from bankruptcy and subject to Tribune's 2014 and 2015 federal income tax audits (described below).
On September 19, 2019, Tribune became a wholly owned subsidiary of Nexstar following Nexstar's merger with Tribune. Nexstar disagrees with the IRS's position that the Chicago Cubs Transactions generated taxable gain in 2009, the proposed penalty and the IRS's calculation of the gain. If the IRS prevails in its position, the gain on the Chicago Cubs Transactions would be deemed to be taxable in 2009. We estimate that the federal and state income taxes would be approximately $225 million before interest and penalties. Any tax, interest and penalty due will be offset by tax payments made relating to this transaction subsequent to 2009. Tribune made approximately $154 million of tax payments prior to its merger with Nexstar.
A bench trial in the U.S. Tax Court took place between October 28, 2019 and November 8, 2019, and closing arguments took place on December 11, 2019. The Tax Court issued a separate opinion on January 6, 2020 holding that the IRS satisfied the procedural requirements for the imposition of the gross valuation misstatement penalty. The judge deferred any litigation of the penalty until a final determination was reached by the Tax Court or Court of Appeals.
On October 26, 2021, the Tax Court issued an opinion related to the Chicago Cubs Transactions, which held that Tribune's structure was, in substantial part, in compliance with partnership provisions of the Code and, as a result, did not trigger the entire 2009 taxable gain proposed by the IRS. On October 19, 2022, the Tax Court entered the decision that there is no tax deficiency or penalty due in the 2009 tax year. On January 13, 2023, the IRS filed a notice of appeal to the U.S. Court of Appeals for the Seventh Circuit. On February 3, 2023, the Company filed a notice of cross-appeal. On February 15, 2024, the case was argued before the U.S. Court of Appeals for the Seventh Circuit. The Company expects a ruling from the Court of Appeals in 2025.
As of December 31, 2024, we believe the tax impact of applying the Tax Court opinion to 2009 and its impact on subsequent years is not material to the Company's accounting for uncertain tax positions or to its Consolidated Financial Statements. Although management believes its estimates and judgments are reasonable, the timing and ultimate resolution are unpredictable and could materially change.
Prior to Nexstar's merger with Tribune in September 2019, Tribune was undergoing a federal income tax audit for taxable years 2014 and 2015. In the third quarter of 2020, the IRS completed its audit of Tribune and issued a Revenue Agent's Report which disallowed the reporting of certain assets and liabilities related to Tribune's emergence from Chapter 11 bankruptcy on December 31, 2012. We disagree with the IRS's proposed adjustments to the tax basis of certain assets and the related taxable income impact, and we are contesting the adjustments through the IRS administrative appeal procedures. If the IRS prevails in its position and after taking into account the impact of the Tax Court opinion, Nexstar would be required to reduce its tax basis in certain assets resulting in a $17 million increase in its federal and state taxes payable and a $69 million increase in deferred income tax liability as of December 31, 2024. In accordance with Accounting Standards Codification ("ASC") Topic 740, the Company has reflected $11 million for certain contested issues in its liability for uncertain tax positions at December 31, 2024 and December 31, 2023.