Each insurance policy shall have a provision that the insured is entitled to a thirty-one-day period within which the payment of any premium or assessment after the first payment may be made. At the option of the insurer this may be subject to a reasonable interest charge for the number of days of grace elapsing before the payment of the premium or assessment. The provision shall also state that during the grace period the policy shall continue in full force, but if a claim arises under the policy during the grace period before the overdue premium or assessment is paid, the amount of such premium or assessment, with applicable interest, may be deducted from any amount payable under the policy in settlement.