Actuarial valuations
(c) Actuarial valuations. The present value of annuities, interests for life or a term of years, and remainder or reversionary interests for estates of decedents for which the valuation date of the gross estate is on or after June 1, 2023, is determined under paragraph (d) of this section. The present value of annuities, interests for life or a term of years, and remainder or reversionary interests for estates of decedents for which the valuation date of the gross estate is before June 1, 2023, is determined (subject to paragraph (d)(3) of this section) under the following sections: