Why average daily balance, not average balance
Average daily balance (ADB) weights every balance by the number of days it was held, so it reflects how much cash a business truly keeps on hand across the month — not a lucky snapshot on deposit day. A merchant that deposits big on the 1st and drains the account by the 15th has a low ADB even if the peak balance looked healthy.
How underwriters use it
ADB sets the cushion side of the deal. Funders pair it with NSFs, negative days and true revenue to size an advance and price the factor rate. A thin ADB against a large requested advance is a fast decline.