Item 3. Legal Proceedings

We are subject to routine legal proceedings, as well as demands, claims and threatened litigation that arise in the normal course of our business. The ultimate outcome of any litigation is often uncertain and unfavorable outcomes could have a negative impact on our results of operations and financial condition. Regardless of outcome, litigation can have an adverse impact on Synopsys because of the defense costs, diversion of management resources and other factors.

We regularly review the status of each significant matter and assess its potential financial exposure. If the potential loss from any claim or legal proceeding is considered probable and the amount is estimable, we accrue a liability for the estimated loss. Legal proceedings are inherently uncertain and as circumstances change, it is possible that the amount of any accrued liability may increase, decrease, or be eliminated.

In July 2017, the HTA issued a final assessment against Synopsys Hungary for fiscal years 2011 through 2013. The HTA disallowed Synopsys Hungary's tax positions taken during these years regarding the timing of the deduction of research expenses and applied withholding taxes on certain payments made to affiliates, resulting in an aggregate tax assessment of approximately $44.5 million and interest and penalties of $18.0 million. On August 2, 2017, Synopsys Hungary filed a claim contesting the final assessment with the Administrative Court. On November 16, 2017, Synopsys Hungary paid the assessment as required by law, while continuing its challenge to the assessment in court. Hearings were held in February and July 2018, February 26, 2019 and April 30, 2019. On December 10, 2018, Synopsys withdrew its claim contesting the final assessment with regard to the timing of the deduction of research expenses, resulting in a remaining disputed tax assessment of approximately $25.0 million and interest and penalties of $11.0 million. On April 30, 2019, the Administrative Court ruled against Synopsys Hungary. The Administrative Court's opinion was received on May 16, 2019. Synopsys Hungary filed an appeal with the Hungarian Supreme Court on July 5, 2019. In the second quarter of 2019, as a result of the Administrative Court's decision, we recorded a tax expense due to an unrecognized tax benefit of $17.4 million, which is net of estimated U.S. foreign tax credits for the tax assessments. The Hungarian Supreme Court heard our appeal on November 12, 2020 and remanded the case to the Administrative Court for further proceedings. We received the Hungarian Supreme Court's written decision in the first quarter of fiscal 2021. On April 27, 2021, the Administrative Court reheard the case and again ruled against Synopsys Hungary. We received the written opinion from the Administrative Court on May 19, 2021 and filed an appeal with the Hungarian Supreme Court on July 19, 2021. The hearing for the appeal is scheduled for January 27, 2022.

For further discussion of the Hungary audit, see Note 13 of Notes to Consolidated Financial Statements under the heading "Non-U.S. Examinations."