12 CFR § 220.8 - Cash account.
(a) Permissible transactions. In a cash account, a creditor, may:
(1) Buy for or sell to any customer any security or other asset if:
(i) There are sufficient funds in the account; or
(ii) The creditor accepts in good faith the customer's agreement that the customer will promptly make full cash payment for the security or asset before selling it and does not contemplate selling it prior to making such payment;
(2) Buy from or sell for any customer any security or other asset if:
(i) The security is held in the account; or
(i) In the case of a short call or a short put, the creditor is advised by the customer that the required securities, assets or cash are held by a person authorized to issue an escrow agreement and the creditor independently verifies that the appropriate escrow agreement will be delivered by the person promptly; or
(ii) In the case of a call issued, endorsed, guaranteed, or sold on the same day the underlying asset is purchased in the account and the underlying asset is to be delivered to a person authorized to issue an escrow agreement, the creditor verifies that the appropriate escrow agreement will be delivered by the person promptly.
(b) Time periods for payment; cancellation or liquidation -
(i) Within one payment period of the date:
(A) Any nonexempted security was purchased;
(B) Any when-issued security was made available by the issuer for delivery to purchasers;
(C) Any “when distributed” security was distributed under a published plan;
(1) The customer purchased the new security no more than 35 calendar days prior to the date of maturity or redemption of the old security;
(2) The customer is entitled to the proceeds of the redemption; and
(3) The delayed payment does not exceed 103 percent of the proceeds of the old security.
(ii) In the case of the purchase of a foreign security, within one payment period of the trade date or within one day after the date on which settlement is required to occur by the rules of the foreign securities market, provided this period does not exceed the maximum time permitted by this part for delivery against payment transactions.
(2) Delivery against payment. If a creditor purchases for or sells to a customer a security in a delivery against payment transaction, the creditor shall have up to 35 calendar days to obtain payment if delivery of the security is delayed due to the mechanics of the transaction and is not related to the customer's willingness or ability to pay.
(3) Shipment of securities, extension. If any shipment of securities is incidental to consummation of a transaction, a creditor may extend the payment period by the number of days required for shipment, but not by more than one additional payment period.
(4) Cancellation; liquidation; minimum amount. A creditor shall promptly cancel or otherwise liquidate a transaction or any part of a transaction for which the customer has not made full cash payment within the required time. A creditor may, at its option, disregard any sum due from the customer not exceeding $1000.
(c) 90 day freeze.
(1) If a nonexempted security in the account is sold or delivered to another broker or dealer without having been previously paid for in full by the customer, the privilege of delaying payment beyond the trade date shall be withdrawn for 90 calendar days following the date of sale of the security. Cancellation of the transaction other than to correct an error shall constitute a sale.
(2) The 90 day freeze shall not apply if:
(i) Within the period specified in paragraph (b)(1) of this section, full payment is received or any check or draft in payment has cleared and the proceeds from the sale are not withdrawn prior to such payment or check clearance; or
(ii) The purchased security was delivered to another broker or dealer for deposit in a cash account which holds sufficient funds to pay for the security. The creditor may rely on a written statement accepted in good faith from the other broker or dealer that sufficient funds are held in the other cash account.
(d) Extension of time periods; transfers.
(1) Unless the creditor's examining authority believes that the creditor is not acting in good faith or that the creditor has not sufficiently determined that exceptional circumstances warrant such action, it may upon application by the creditor:
(i) Extend any period specified in paragraph (b) of this section;
(ii) Authorize transfer to another account of any transaction involving the purchase of a margin or exempted security; or
(iii) Grant a waiver from the 90 day freeze.
(2) Applications shall be filed and acted upon prior to the end of the payment period, or in the case of the purchase of a foreign security within the period specified in paragraph (b)(1)(ii) of this section, or the expiration of any subsequent extension.