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Adding a 180 day expiration to checks
Your bank has discretion to honor checks after 6 months, so you should talk to your bank about their specific policy. In general, banks won't accept "large" stale checks. The meaning of "large" varies -- $25,000 in NYC, as little as $2k in other places. Banks that service high-volume check issuers (like rebate companies) reject checks at 180 days. For business purposes, I think some banks will create accounts for specific mailings or other purposes as well. (i.e. 2011 refund account) The accounts close after a year.