It depends on your contract. If the account is extinguished at maturity, then you have a new account (regardless if you internally use the same account number). If it is a new account, you would trigger all new disclosure and since the account was closed, if that was the only account that the person had, they would no longer be an existing customer and would require CIP procedures.
If it is not extinguished and you have previously disclosed that it is a variable rate account, then no new disclosures would be required. If you have not previously disclosed that it is a variable account, you would have to provide them prior notice to change the interest rate.
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