Company: AHL
Filing Date: 2025-05-08
Form Type: 424B4
Source: 0001628280-25-023859
Chunk: 465

Company: ASPEN INSURANCE HOLDINGS LTD
Filing Date: 2025-05-08
Form: 424B4
Chunk 465
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     |   | 19.2 | % |     |   | 21.6 | % |     |   | 19.1 | % |     |   | 11.8 | % |     |   |  5.0 | % |     |   |  1.8 | % |     |   |    — | % |     |   | — | % |     |    | — | % |
| Specialty reinsurance                               |     |   | 26.7 | % |     |   | 32.8 | % |     |   | 12.7 | % |     |   |  7.6 | % |     |   |  3.1 | % |     |   |  0.6 | % |     |   | -0.9 | % |     |   | -0.2 | % |     |   | — | % |     |    | — | % |

<div align='center'>F-54</div>

#### 11.

#### Income Taxes
Aspen Holdings and Aspen Bermuda are incorporated under the laws of Bermuda. Under Bermuda law, the corporate tax rate is currently zero and, as a result, Aspen Holdings and Aspen Bermuda are not taxed on any Bermudian income or capital gains. On December 27, 2023, the Corporate Income Tax Act 2023 received Royal Assent in Bermuda, introducing a 15% corporate tax that applies to Bermuda businesses that are part of multinational enterprise groups. This new corporate tax takes effect for accounting periods beginning on or after January 1, 2025. We have adjusted our deferred tax to account for provisions within the Corporate Income Tax Act that allow for an equitable transition to the new regime including the Economic Transition Adjustments (“ETA”) and opening tax loss carryforward (“OTLC”).

The Company’s U.S. operating companies were subject to a U.S. federal income tax rate of 21%.

The Company’s U.K. operating companies were taxed at the effective U.K. corporate tax rate of 25.0%. The U.K. tax rate changed on April 1, 2023 from 19% to 25%.

Total income tax (benefit)/expense for the twelve months ended December 31, 2024, 2023 and 2022 was allocated as follows:

|                                                                      |     | Twelve Months Ended December 31, 
 2024                             
 ($ in millions)                  |