partnership interest and which, by reason of a change in the services with respect to assets held (directly or indirectly) by the partnership or by reason of a change in the capital contributions to such partnership, becomes an investment services partnership interest, the qualified capital interest of the holder of such partnership interest immediately after such change shall not, for purposes of this subsection, be less than the fair market value of such interest (determined immediately before such change). (4) Special rule for tiered partnerships Except as otherwise provided by the Secretary, in the case of tiered partnerships, all items which are allocated in a manner which meets the requirements of paragraph (1) to qualified capital interests in a lower-tier partnership shall retain such character to the extent allocated on the basis of qualified capital interests in any upper-tier partnership. (5) Exception for no-self-charged carry and management fee provisions Except as otherwise provided by the Secretary, an interest shall not fail to be treated as satisfying the requirement of paragraph (1)(A) merely because the allocations made by the partnership to such interest do not reflect the cost of services described in subsection (c)(2) which are provided (directly or indirectly) to the partnership by the holder of such interest (or a related person). (6) Special rule for dispositions In the case of any investment services partnership interest any portion of which is a qualified capital interest, subsection (b) shall not apply to so much of any gain or loss as bears the same proportion to the entire amount of such gain or loss as— (A) the distributive share of gain or loss that would have been allocated to the qualified capital interest (consistent with the requirements of paragraph (1)) if the partnership had sold all of its assets at fair market value immediately before the disposition, bears to (B) the distributive share of gain or loss that would have been so allocated to the investment services