How do I collect an unpaid invoice from a staffing agency client?
How to collect an unpaid staffing agency invoice
Published May 13, 2026
Short answer
Staffing invoices typically stall for one of three reasons: a timecard signature is missing, the invoice is stuck in an MSP vendor portal that nobody is watching, or the end-client is disputing hours billed. Fix the documentation first (signed timecards, hour ledgers, supervisor approvals), then call the AP contact on day 3 past due to confirm portal status. Most staffing collections issues resolve once the right person sees the right paperwork. Escalate above the day-to-day manager only after two failed AP calls.
Staffing agency receivables look simple but break in predictable ways. The work was performed by a placed worker, the timecard was signed (or not), and the client's AP department processes the invoice on their own schedule. When an invoice goes past due, the issue is rarely that the client refuses to pay. It is almost always a paperwork or portal gap that nobody on either side noticed.
Before any collection call, audit the invoice file. Do you have a signed timecard for every hour billed? If your worker logged into a client time system, can you pull a copy of those hours? Is the PO number on the invoice still active, or did the client roll the project to a new PO and forget to tell you? If you cannot answer those questions in 60 seconds, the collection call will go badly because the AP contact will ask the same questions.
On day 3 past due, call AP directly. The script is short: 'I am calling about invoice 4221, $14,820, dated April 10. I want to confirm it is in your system and ask if there is any documentation gap on our side.' Most of the time, the answer is 'it is queued for the next check run' or 'we needed a copy of the signed timecard.' Both are 5-minute fixes.
MSP and VMS portals are a recurring trap. If your client uses Fieldglass, Beeline, Bullhorn VMS, or similar, your invoice may be sitting in a queue that the client does not check daily. You usually have to chase the portal, not the client. Get a login if you don't have one, and add a calendar reminder to check pending invoices weekly.
Syntharra handles the day-3 first-party call automatically for staffing agencies on QuickBooks, Xero, or FreshBooks. The call confirms the invoice is in the AP queue and surfaces any documentation gap immediately so you can resolve it before the issue ages. Disputes and portal issues route back to you the same day.