Transitional rule. If the valuation date of a transfer of property by gift is on or after May 1, 2009, and before July 1, 2009, the fair market value of the interest transferred is determined by use of the section 7520 interest rate for the month in which the valuation date occurs (see 25.7520-1(b) and 25.7520-2(a)(2)) and the appropriate actuarial tables under either 20.2031-7(d)(7) or 20.2031-7A(f)(4) of this chapter, at the option of the donor. However, with respect to each individual transaction and with respect to all transfers occurring on the valuation date, the donor must use the same actuarial tables (for example, gift and income tax charitable deductions with respect to the same transfer must be determined based on the same tables, and all transfers made on the same date must be valued based on the same tables).
26 CFR § 25.2512-5
In general. Except as otherwise provided in paragraph (b) of this section and 25.7520-3(b), the fair market value of annuities, unitrust interests, life estates, terms of years, remainders, and reversions transferred by gift is the present value of the interests determined under paragraph (d) of this section. Section 20.2031-7 of this chapter (Estate Tax Regulations) and related sections provide tables with standard actuarial factors and examples that illustrate how to use the tables to compute the present value of ordinary annuity, life, and remainder interests in property. These sections also refer to standard and special actuarial factors that may be necessary to compute the present value of similar interests in more unusual fact situations. These factors and examples are also generally applicable for gift tax purposes in computing the values of taxable gifts.