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Reg DD - CD APY Calculator Confusion

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Question: 
Reg. DD's CD APY formula calculates based on 365 days. Is it possible to also use 360 days? Appendix A part 1A seems to suggest that there are options other than 365 days, but we are having a hard time clarifying its meaning. The OCC calculator allows for both 360 or 365 days so that is adding to our confusion.
Answer: 

You are permitted by 230.7 to use a daily interest factor equal to the interest rate divided by any number equal to or less than 365 (366 in a leap year). But you must apply that factor every day of the year on which you hold the deposit. So if you use a "360 method" you will actually pay more interest (because the factor will be greater than it would if you used 365).

The APY should be greater if you use 360-based factor in interest calculation.

First published on BankersOnline.com 07/18/05

First published on 07/18/2005

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