any trust that is not a grantor trust. (g) Regulations The Secretary shall issue such regulations or other guidance as may be necessary or appropriate to carry out the purposes of this section, including— (1) regulations establishing a process by which a beneficiary may demonstrate the portion of such beneficiary’s interest in a trust, and (2) regulations for determining the appropriate attribution of assets in a trust for purposes of subsection (e)(1) in the case of a trust with multiple grantors. 2902. Net value of taxable assets (a) In general For purposes of this subtitle, the term net value of all taxable assets means, as of any date, the excess of— (1) the value of all property of the taxpayer (other than property excluded under subsection (b)), real or personal, tangible or intangible, wherever situated, over (2) any debts (including any debts secured by property excluded under subsection (b)) owed by the taxpayer. (b) Exclusion for certain assets under $50,000 Property of the taxpayer shall not be taken into account under subsection (a) if such property— (1) has a value of $50,000 or less (determined without regard to any debt owed by the taxpayer with respect to such property), (2) is tangible personal property, and (3) is not property— (A) which is used in a trade or business of the taxpayer, (B) in connection with which a deduction is allowable under section 212, or (C) which is a collectible as defined in section 408(m), a boat, an aircraft, a mobile home, a trailer, a vehicle, or an antique or other asset that maintains or increases its value over time (within the meaning of section 5.02(2) of Revenue Procedure 2018–08). (c) Rules for determining property of the taxpayer For purposes of this subtitle: (1) Property included in estate Any property that would be included in the estate of the taxpayer if the taxpayer died shall be treated as property of the taxpayer. (2) Inclusion of certain gifts Any property transferred by the taxpayer after the date of the enactment of this chapter, to an individual