What does your deposit contract/agreement say? Does it provide for the charging of an OD fee when a bank fee takes an account negative? From a regulatory perspective, you're going to pull the UDAAP trigger if you don't disclose it if that's what happens.
But from a date OD perspective, what difference does it make what transaction took the account into sub-zero territory. It went negative, and if it doesn't return to positive, you will have a charge-off in 45 (CUs) or 60 (others) days.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8