There is no hard and fast rule. The closest guidance you will find is in an old staff opinion:
Ideally, controls on excess transfers should be sufficiently flexible to address both excess transfers in nonconsecutive months as well as the level of excess transfers in a particular month. Such controls would help depository institutions distinguish inadvertent violations of the transfer limits from abuses of the transfer limits. Thus, when a customer ignores the transfer limits applicable to an MMDA, the depository institution should take steps to close the account more quickly than it would an account from which the depositor inadvertently, and occasionally, exceeds the transfer limits by a single transfer. Nevertheless, a monitoring system that would detect and prevent all excess transfers may be costly to administer. For this reason, the staff has applied a general rule that an institution may continue to consider an account an MMDA even if there are excess transfers so long as those excess transfers are not the result of an attempt to evade the transfer limits, and if the excess transfers occur in not more than three months during any 12-month period. This working rule is not absolute, however, and the facts and circumstances must be considered in each case. STAFF OP. of Feb. 15, 1990.
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The opinions expressed here should not be construed to be those of my employer:
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