If you have a product that ordinarily compounds monthly and customers may elect to withdraw interest or have it transferred out, the account should be set up to compound monthly and the APY disclosed must reflect that compounding.
If you offer a product from which interest MUST be withdrawn during the term, you set the account up not to compound and the APY will reflect that fact.
The difference is the product design. If the customer can decide whether to take interest distributions, you have to assume that those distributions won't occur.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8