The "Uninvoiced" balance that appears in the Account Balance area of a Client Account screen reflects the balance for Jobs that have been completed but the Invoice has yet to be generated.
You'll see an amount in this field when a Job has been completed but the Invoice Frequency at the Job level is set to anything other than "Daily" or "Print in Advance."
For example, if a Client has a weekly mowing service but they are billed monthly, the Uninvoiced Balance becomes a running total until the Invoice is generated on the last day of the month. Remember that when a Job is completed in this scenario, an Invoice is created but not yet generated. It's an Incomplete Invoice. You can view Incomplete Invoices by going to Accounting > Invoices > Incomplete tab.
To see which Jobs are contributing to the Uninvoiced Balance, click on All History in the Jobs section:
Jobs with a green check mark indicate that the visit has been completed but the Invoice has not been generated: