IRS form 1099-B which records the maturity of a certificate of deposit generally reports the principal amount of the investment as both the Proceeds and Cost or other basis reporting $0 gain.
As you described, the interest income is reported separately.
In your case, what cost basis has been assigned and what explanation have your been given?
You may need to report The cost basis is incorrect or missing on my 1099-B.
@sbchapp
[Edited 03/13/25 | 6:53 pm PST]
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