Wisconsin Statutes
Wis. Stat. § 403.403 (2026)
Unauthorized signature
✓ current as of July 2026
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403.403(1)(1) Unless otherwise provided in this chapter or ch. 404, an unauthorized signature is ineffective except as the signature of the unauthorized signer in favor of a person who in good faith pays the instrument or takes it for value. An unauthorized signature may be ratified for all purposes of this chapter.
403.403(2)(2) If the signature of more than one person is required to constitute the authorized signature of an organization, the signature of the organization is unauthorized if one of the required signatures is lacking.
403.403(3)(3) The civil or criminal liability of a person who makes an unauthorized signature is not affected by any provision of this chapter which makes the unauthorized signature effective for the purposes of this chapter.
Notes of Decisions
Cited in 4
cases, 1986–2001 · leading case: In the Matter of Disciplinary Proceedings Against Harman, 2001 WI 71 (Wis. 2001).
In the Matter of Disciplinary Proceedings Against Harman, 2001 WI 71 (Wis. 2001). “Harman's reliance on a provision in the Uniform Commercial Code, Wis. Stat. § 403.403 (1) to support that ratifica *447 tion argument is misplaced.”
Bostwick-Braun Co. v. Szews, 645 F. Supp. 221 (W.D. Wis. 1986). “Plaintiff’s attempt to apply Wis. Stat. § 403.403 is thus not only incorrect (it applies only to commercial paper), but it would not lead to the result urged by the plaintiff even if it were applicable.”
Korhumel Steel Corp. v. Wandler, 600 N.W.2d 592 (Wis. Ct. App. 1999). “6 This is Colorado's version of our § 403.403(2)(b), Stats., 1993-94, the predecessor to the present § 403.”
Coveau v. Durand, 432 N.W.2d 662 (Wis. Ct. App. 1988). “The court refused to consider parol evidence pursuant to sec. 403.403(2)(a), Stats., and entered a judgment in favor of Coveau.”
Wis. Stat. § 403.403(2)(a): 1 case
Coveau v. Durand, 432 N.W.2d 662 (Wis. Ct. App. 1988). “The court refused to consider parol evidence pursuant to sec. 403.403(2)(a), Stats., and entered a judgment in favor of Coveau.”
Wis. Stat. § 403.403(2)(b): 1 case
Korhumel Steel Corp. v. Wandler, 600 N.W.2d 592 (Wis. Ct. App. 1999). “6 This is Colorado's version of our § 403.403(2)(b), Stats., 1993-94, the predecessor to the present § 403.”
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