A bank is under no obligation to a customer having a checking account to pay a check, other than a certified check, which is presented more than 6 months after its date, but it may charge its customer’s account for a payment made thereafter in good faith.
Wis. Stat. § 404.404
Bank not obligated to pay check more than 6 months old
Official source: Wisconsin State Legislature. Reproduced from public-domain Wisconsin statutes; confirm against the official source for the current text. Not legal advice.