TL;DRThe average number of days between issuing an invoice and collecting it.
DSO is receivables divided by credit sales, times the days in the period. A rising DSO means customers are paying slower, invoices are going out late, or follow-up is not happening — usually a mix.
Because it compounds across every invoice, small process fixes move it: a reminder three days earlier, a dispute resolved in a week instead of a month, a deposit matched the day it lands.
Where it happens in Sonic
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See it on your contracts
A walkthrough on the agreements and files you actually bill from — not a slide deck.