This depends on, mostly, with how you manage your items under our Fair usage policy.
For any three month period, your account has a balance of items for all three months. If you subscribe to the 50 item per month plan, you have a balance of 150 items per three month period. This way, if you submit 55 items one month, and 45 and 50 items then next two months, you’re within the limits of your plan. This policy scales at all subscription levels.
Almost every account is able to stay within the bounds of their subscription level with the Fair usage policy in place. However, if you are unable to stay within the bounds of your plan, you will be prompted to update your subscription level to reflect the number of items you are actually submitting to Receipt Bank.