Section 220.5 - Special memorandum account(a) A special memorandum account (SMA) may be maintained in conjunction with a margin account. A single entry amount may be used to represent both a credit to the SMA and a debit to the margin account. A transfer between the two accounts may be effected by an increase or reduction in the entry. When computing the equity in a margin account, the single entry amount shall be considered as a debit in the margin account. A payment to the customer or on the customer's behalf or a transfer to any of the customer's other accounts from the SMA reduces the single entry amount.(b) The SMA may contain the following entries:(1) Dividend and interest payments;(2) Cash not required by this part, including cash deposited to meet a maintenance margin call or to meet any requirement of a self-regulatory organization that is not imposed by this part;(3) Proceeds of a sale of securities or cash no longer required on any expired or liquidated security position that may be withdrawn under § 220.4(e) ; and(4) Margin excess transferred from the margin account under § 220.4(e)(2) .Reg. T, 63 FR 2824, Jan. 16, 1998