(a) Scope. This section applies if—

(1) A dealer in securities acquires a security that is subject to section 475(a) and the dealer's basis in the security is determined, in whole or in part, by reference to the basis of that security in the hands of the person from whom the security was acquired; or

(2) A dealer in securities acquires a security that is subject to section 475(a) and the dealer's basis in the security is determined, in whole or in part, by reference to other property held at any time by the dealer.

(b) Rules. If this section applies to a security—

(1) Section 475(a) applies only to changes in value of the security occurring after the acquisition; and

(2) Any built-in gain or loss with respect to the security (based on the difference between the fair market value of the security on the date the dealer acquired it and its basis to the dealer on that date) is taken into account at the time, and has the character, provided by the sections of the Internal Revenue Code that would apply to the built-in gain or loss if section 475(a) did not apply to the security.