Assuming you are offering this account to consumers, look at Regulation DD, Appendix A, Section 1.C. for information on how to properly calculate the APY for this account. It is only that properly calculated APY that can be used in your disclosure and advertising for the account (per definition of APY in Reg DD).
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Jim Bedsole, CRCM, CBA, CFSA, CAFP
My posts - my opinions