HANOVER INSURANCE GROUP, INC.

We file a consolidated U.S. federal income tax return that includes our holding company and its domestic subsidiaries (including non-insurance operations).

The provision for income taxes from continuing operations was an expense of $183.1 million and $112.5 million in 2025 and 2024, respectively. These amounts resulted in consolidated effective tax rates of 21.7% and 20.9% on pre-tax income for 2025 and 2024, respectively. The provisions include excess tax benefits, primarily related to stock-based compensation and tax planning strategies implemented in prior years, of $3.6 million and $3.1 million, respectively. The provision in 2025 also included state income tax expense, net of federal income tax effect, of $6.3 million. In addition, the provision for 2024 included benefits related to the release of prior years’ uncertain tax position of $1.0 million. Absent these items, the provisions for income taxes for 2025 and 2024 would have been expenses of $180.4 million, or 21.4%, and $116.6 million, or 21.7%, respectively.

The income tax provision on operating income was an expense of $193.6 million and $130.1 million for 2025 and 2024, respectively. These provisions resulted in effective tax rates on operating income of 21.8% and 21.1%, respectively. The provisions for 2025 and 2024 reflect the aforementioned excess tax benefits related to stock-based compensation, state income tax expense, and the benefits related to the release of prior years’ uncertain tax position. Absent these items, the provisions for income taxes for 2025 and 2024 would have been expenses of $190.1 million, or 21.4%, and $133.0 million, or 21.6%, respectively.

We are subject to U.S. federal and state examinations for years after 2020.