N.Y. Comp. Codes R. & Regs. tit. 11, § 43.3
(3) If a policy limits the amount by which cash surrender benefits may be increased by application of a market-value adjustment formula to a specific percentage of the policy value, the same or lower percentage limit shall apply during periods when the application of the market-value adjustment formula results in a decrease in cash surrender benefits (see example 2 in section 43.9[a][1] of this Part), unless the company can demonstrate, to the satisfaction of the superintendent, that equity to terminating and continuing policyholders and to the company is better served by using a different percentage limit in such circumstances.
(b) Single premium policies.
(2) Alternatively, a market-value adjustment formula for a single premium policy may be based on (i) the difference between the interest rate, at the time the premium is remitted, based on an appropriate index of publicly traded obligations for the specified time interval, and the interest rate at the time the policy is surrendered for its cash value, based on the same index, or if no longer available, on an appropriate substitute index of publicly traded obligations, for the period remaining under the policy until the guaranteed benefit date (i.e., the end of the specified time interval); and (ii) such remaining period. No index used under this paragraph may be based on publicly traded obligations that are owned or managed by the company. (See example 3 in section 43.9[a][2] of this Part.)
(c) Policies other than single premium policies.
(6) At its option, where there is a common guaranteed benefit date for all premiums remitted, the company may base a market-value adjustment on a blended interest rate based on the weighted average of the interest rates associated with premiums previously credited as an approximation for adjustments based on each such interest rate. (See example 4[ii[ in section 43.9[b[[1[ of this Part.)
(d) Additional requirements.
(1) Under a market-value adjustment formula described in this subdivision:
(a) General principles.