Here'a a
prior thread on recognizing an MSB as an exempt person under phase II. The consensus is that you probably can, but it fails the "Is this wise?" test miserably.
As long as the withdrawals are being made from a deposit account, their eligibility for exemption should not be affected by whether the source is avaialble funds or a line of credit.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.