(iii) Special rule for joint bank, brokerage, and other investment accounts (e.g., accounts held at mutual funds) established between spouses or between persons other than husband and wife. In the case of a transfer to a joint bank, brokerage, or other investment account (e.g., an account held at a mutual fund), if a transferor may unilaterally regain the transferor's own contributions to the account without the consent of the other cotenant, such that the transfer is not a completed gift under § 25.2511-1(h)(4), the transfer creating the survivor's interest in the decedent's share of the account occurs on the death of the deceased cotenant. Accordingly, if a surviving joint tenant desires to make a qualified disclaimer with respect to funds contributed by a deceased cotenant, the disclaimer must be made within 9 months of the cotenant's death. The surviving joint tenant may not disclaim any portion of the joint account attributable to consideration furnished by that surviving joint tenant. See paragraph (c)(5), Examples (12), (13), and ( 14 ), of this section, regarding the treatment of disclaimed interests under sections 2518, 2033 and 2040.