Company: SNY
Filing Date: 2025-10-29
Form Type: 424B5
Source: 0001193125-25-255563
Chunk: 121

Company: Sanofi
Filing Date: 2025-10-29
Form: 424B5
Chunk 121
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 discount on a current basis (in which case the limitation on the
deductibility of interest described above will not apply). A U.S. holder using the accrual method of tax accounting and some cash-basis holders generally will be required to include original issue discount on a short-term debt security in gross
income on a current basis. Original issue discount will be treated as accruing for these purposes on a ratable basis or, at the election of the holder, on a constant yield basis based on daily compounding.

Second, regardless of whether you are a cash-basis or accrual-basis holder, if you are the holder of a short-term debt security you may elect
to accrue any “acquisition discount” with respect to the debt security on a current basis. Acquisition discount is the excess of the remaining redemption amount of the debt security at the time of acquisition over the purchase price.
Acquisition discount will be treated as accruing ratably to the electing shareholder, or, at the election of the holder, under a constant yield method based on daily compounding. If you elect to accrue acquisition discount, the original issue
discount rules will not apply.

Finally, the market discount rules described below will not apply to short-term debt securities.

Premium

If you purchase
a debt security at a cost greater than the debt security’s remaining redemption amount, you will be considered to have purchased the debt security at a premium, and you may elect to amortize the premium as an offset to interest income, using a
constant yield method, over the remaining term of the debt security. If you make this election, it generally will apply to all debt instruments that you hold at the time of the election, as well as any debt instruments that you subsequently acquire.
In addition, you may not revoke the election without the

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consent of the U.S. Internal Revenue Service. If you elect to amortize the premium, you will be required to reduce your tax basis in the debt security by the amount of the premium amortized
during your holding period. Original Issue Discount Debt Securities purchased at a premium will not be subject to the original issue discount rules described above. In the case of premium on a foreign currency debt security, you should calculate the
amortization of the premium in the foreign currency. Premium amortization deductions attributable to a period reduce interest income in respect of that period, and therefore should be translated into U.S. dollars at the rate that you use for
interest payments in respect of that period