This is the definition a grace period: For purposes of § 226.5(b)(2)(ii)(B), “grace period” means a period within which any credit extended may be repaid without incurring a finance charge due to a periodic interest rate. A deferred interest or similar promotional program under which the consumer is not obligated to pay interest that accrues on a balance if that balance is paid in full prior to the expiration of a specified period of time is not a grace period for purposes of § 226.5(b)(2)(ii)(B). Similarly, a period following the payment due date during which a late payment fee will not be imposed is not a grace period for purposes of § 226.5(b)(2)(ii)(B). See comments 7(b)(11)-1, 7(b)(11)-2, and 54(a)(1)-2.
Based on that definition, you will be required to comply one way or another (depending on how you handle finance charges).
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It's not that I take life for granted. It's only that the good won't make it. Innocence dies, while Villany Thrives.