Company: SNY
Filing Date: 2025-10-27
Form Type: 424B5
Source: 0001193125-25-250786
Chunk: 117

Company: Sanofi
Filing Date: 2025-10-27
Form: 424B5
Chunk 117
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clusions of original issue discount to reflect the premium paid over the adjusted issue price.

Floating rate debt securities generally will be treated as “variable rate debt instruments” under the U.S. Treasury Regulations
governing original issue discount. Accordingly, the stated interest on a Floating Rate Debt Security generally will be treated as “qualified stated interest” and such a debt security will not have original

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issue discount solely as a result of the fact that it provides for interest at a variable rate. If a floating rate debt security does not qualify as a “variable rate debt instrument,”
the debt security will be subject to special rules that govern the tax treatment of debt obligations that provide for contingent payments. We will provide a detailed description of the material tax considerations relevant to U.S. holders of any such
debt securities in the applicable prospectus supplement.

Certain Original Issue Discount Debt Securities may be redeemed prior to
maturity, either at the option of the Company or at the option of the holder, or may have special repayment or interest rate reset features as indicated in the applicable prospectus supplement. Original Issue Discount Debt Securities containing
these features may be subject to rules that differ from the general rules discussed above. If you purchase Original Issue Discount Debt Securities with these features, you should carefully examine the applicable prospectus supplement and consult
your tax adviser about their treatment since the tax consequences of original issue discount will depend, in part, on the particular terms and features of the debt securities.

Short-Term Debt Securities

The rules described above will also generally apply to Original Issue Discount Debt Securities with maturities of one year or less
(“short-term debt securities”), but with some modifications.

First, the original issue discount rules treat none of the
interest on a short-term debt security as qualified stated interest, but treat a short-term debt security as having original issue discount. Thus, all short-term debt securities should be Original Issue Discount Debt Securities. Except as noted
below, if you are a cash-basis holder of a short-term debt security and you do not identify the short-term debt security as part of a hedging transaction you will generally not be required to accrue original issue discount currently, but you should
be required to treat any gain realized on a sale, exchange or retirement of the debt security as ordinary income to the extent such gain does not exceed the original issue discount accrued with respect to the debt security during the period you held
the debt security. A cash basis holder may not be allowed to deduct all of the interest paid or