N.Y. Comp. Codes R. & Regs. tit. 3, § 42.1
(b) The term fully-indexed rate is defined in section 6-m(1)(b) to mean:
“(1) for an adjustable rate loan based on an index, the annual percentage rate calculated using the index rate on the loan on the date the lender provides the ‘good faith estimate’ required under 12 USC section 2601 et seq. plus the margin to be added to it after the expiration of any introductory period or periods; or