(2) Prohibited transaction For purposes of this part, the term prohibited transaction means
(A) Disposition of qualified mortgage The disposition of any qualified mortgage transferred to the REMIC other than a disposition pursuant to
(i) the substitution of a qualified replacement mortgage for a qualified mortgage (or the repurchase in lieu of substitution of a defective obligation),
(ii) a disposition incident to the foreclosure, default, or imminent default of the mortgage,
(iii) the bankruptcy or insolvency of the REMIC, or
(iv) a qualified liquidation.
(B) Income from nonpermitted assets
The receipt of any income attributable to any asset which is neither a qualified mortgage nor a permitted investment.
(C) Compensation for services
The receipt by the REMIC of any amount representing a fee or other compensation for services.
(D) Gain from disposition of cash flow investments
Gain from the disposition of any cash flow investment other than pursuant to any qualified liquidation.
(4) Qualified liquidation For purposes of this part
(A) In general The term qualified liquidation means a transaction in which
(i) the REMIC adopts a plan of complete liquidation,
(ii) such REMIC sells all its assets (other than cash) within the liquidation period, and
(iii) all proceeds of the liquidation (plus the cash), less assets retained to meet claims, are credited or distributed to holders of regular or residual interests on or before the last day of the liquidation period.
(B) Liquidation period The term liquidation period means the period
(i) beginning on the date of the adoption of the plan of liquidation, and
(ii) ending at the close of the 90th day after such date.
(5) Exceptions Notwithstanding subparagraphs (A) and (D) of paragraph (2), the term prohibited transaction shall not include any disposition
(A) required to prevent default on a regular interest where the threatened default resulted from a default on 1 or more qualified mortgages, or
(B) to facilitate a clean-up call (as defined in regulations).