In May, your accounts receivable are superior to your gross sales, so you can add the days of the month straight to your AR days calculation. This is the average number of days it takes customers to pay their debt.MA (Mastercard) Days Sales Outstanding as of today (November 30, 2024) is 50.83. Days Sales Outstanding explanation, calculation, historical data and more. Then, you take out your gross sales from your accounts receivable to report it to the next month's accounts receivable. Days in AR = 61 days. Fill in if the applicant made the retail sales for which tax was collected and remitted. If sales tax was not collected and remitted on retail sales, the. First metric:calculate DSO on AR and Actual Billings. Average days delinquent (ADD) is a metric that lets companies know the average number of days that late payments take to get collected.