A late charge on lease-purchase agreements may be collected only once on any accrued payment, no matter how long it remains unpaid. A late charge may be collected at the time it accrues or at any time thereafter. A lessor may elect to waive imposition of a late charge due on an accrued payment in accordance with the terms of the lease-purchase agreement; provided that the waiver shall be in writing and, once a late charge is waived for a specific payment, the lessor may not seek to impose a late charge for the accrued payment in question. No late charge shall be assessed against a payment that is timely, even though an earlier late charge has not been paid in full.
HRS § 481M-7