Whether you have a right of setoff against garnishments may be a matter of state law. For example, you can't exercise setoff in front of an IRS levy (which isn't a garnishment order under the regulation, anyhow), but you might be able to setoff in front of a state-court-issued garnishment order. Check with bank counsel to determine when setoffs may and may not be taken, and the technical requirements involving default, etc.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8