Company: SNY
Filing Date: 2025-10-29
Form Type: 424B5
Source: 0001193125-25-255563
Chunk: 114

Company: Sanofi
Filing Date: 2025-10-29
Form: 424B5
Chunk 114
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 date that you receive the interest payment if that date is within five business days of the end of the accrual period. If you make this election, you must apply it consistently to all debt instruments from year to year and you cannot
change the election without the consent of the U.S. Internal Revenue Service. If you use the accrual method of accounting for tax purposes, you should recognize foreign currency gain or loss on the receipt of a foreign currency interest payment if
the spot exchange rate in effect on the date the payment is received differs from the rate applicable to a previous accrual of that interest income. This foreign currency gain or loss should be treated as ordinary income or loss, but generally will
not be treated as an adjustment to interest income received on the debt security. Your interest income will be foreign source for U.S. federal income tax purposes, and any foreign exchange gain you realize (as described above) generally will be U.S.
source.

Subject to applicable limitations and the Final FTC Treasury Regulations (as defined below), any withholding tax paid with
respect to interest payments may be eligible for foreign tax credits (or deductions in lieu of such credits) for U.S. federal income tax purposes, subject to applicable limitations. Treasury Regulations issued on December 28, 2021, which apply
to foreign taxes paid or accrued in taxable years beginning on or after

31

December 28, 2021 (the “Final FTC Treasury Regulations”) impose additional requirements for foreign taxes to be eligible for credit. However, the IRS has indicated that taxpayers
generally may defer the application of many of the additional requirements until further notice. The calculation of foreign tax credits involves the application of complex rules that depend on a U.S. holder’s particular circumstances. You
should consult your own tax adviser with regard to the availability of a foreign tax credit with respect to any withholding tax.

Purchase, Sale and Retirement of Debt Securities

Initially, your tax basis in a debt security generally will equal the cost of the debt security to you. Your tax basis should increase by any
amounts that you are required to include in income under the rules governing original issue discount and market discount, each of which is discussed below, and will decrease by the amount of any amortized premium and any payments other than
qualified stated interest made on the debt security. (The rules for determining these amounts are discussed below.)

If you purchase a
debt security that is denominated in a foreign currency, the cost to you (and therefore generally your initial tax basis)