Staffing agency invoice and timesheet exceptions: how to clear them before payroll closes

Where back-office time goes in payroll week

A light industrial firm with a few hundred temps on assignment runs payroll every week, and the timesheets rarely all line up. Some are missing a client supervisor's approval. Others show overtime the schedule did not have, or carry a pay or bill rate that does not match the order. A few charge time to a purchase order that has expired. Each exception holds up either payroll accuracy or cash.

VMS clients add a second queue. Time is often approved inside the client's VMS, and invoices go through the VMS or the MSP. An invoice that fails a check comes back rejected. Beeline's supplier guide shows how much changes with the request type, including the rates section. A rejected invoice is cash that arrives late, after someone fixes the field and resubmits.

Most staffing platforms bundle billing with the rest of the back office. TempWorks sells payroll and billing with time management, JobDiva has its DivaFinancials back office and a MyTime app, Avionté sells payroll and billing, and Ceipal includes invoicing. Those systems hold the data. The exceptions sit between them and each VMS, in email threads and spreadsheets, and that gap is where an agent helps.

What makes a staffing agency invoice go wrong

A staffing invoice is only as right as the timesheet behind it. The amount comes from approved hours times the bill rate, with overtime at the rate the client agreed, and it has to carry the PO or work order number the client expects. A VMS client adds its own required fields and checks each invoice against them before it reaches accounts payable.

A rejection often traces back to a mismatch that someone could have caught earlier. The order was extended but the PO was not. The worker moved to second shift and the rate card still shows first. A supervisor approved hours in the VMS that differ from the punches in your time system. A new bill rate went onto the order but never reached the VMS. Each of these is cheaper to fix on Monday than after the client's AP team sends the invoice back.

Wage and hour accuracy matters as much as cash. A wrong correction to hours changes what a worker is paid, so the agent explains the mismatch and leaves the change to a person. The Department of Labor's hours-worked guidance says work an employer suffers or permits is work time that must be paid. Payroll verifies the hours actually worked and pays wages due on time. Billing approval is handled separately, by the account manager with the client. This is general information. Have counsel confirm the wage rules for your states.

VMS and MSP: who approves what

In a VMS program, the client's platform carries the requisition and the approved time. Invoices usually go through it as well. An MSP, the firm that runs the client's contingent workforce program, often works on top of that platform and may consolidate invoices from many suppliers. Your firm is one supplier among several, sometimes in a tier, and the program's rules decide what a valid invoice looks like.

That changes who you chase. A missing approval sits with the client supervisor, while a rejected invoice may need the MSP program team. A rate mismatch can trace back to the rate card loaded in the program. The agent keeps a record of which program each client belongs to, so the reminder goes to the right person the first time.

The exceptions worth sorting every week

Sort exceptions by the fix each one needs, so each person gets a short list of their own. The table shows the common types, with what an agent can prepare and who signs off.

Two rules hold across every row. The agent never changes hours or rates on its own, because workers' pay and the client's bill both depend on them. Nothing is submitted to a VMS or released to payroll without a person.

Timesheet approval reminders that get answered

Try one message per supervisor that lists the affected timesheets and links to the VMS, with the deadline in the first line. Measure how fast approvals come back against your current reminders, and keep whichever works better.

A reminder the agent drafts might read: 'Hi Dana, 6 timesheets for line 2, week ending 18 October, are waiting for your approval in Beeline. Payroll closes Tuesday at noon. The workers and hours are listed below.' Your payroll clerk approves the batch before it goes. Repeat reminders go to the account manager instead of the supervisor, because by then it is a client conversation.

A weekly routine before payroll closes

Adjust the days to your own cutoff. The routine works when exceptions surface while there is still time to fix them, and when the account manager hears about a rate problem before the client's AP team does.

Keep the list in one shared place instead of personal inboxes. When a payroll clerk is out, the next person can see what went out and what is still open.

• Monday morning: the agent pulls hours, schedules, rates and PO numbers from the back office and each VMS, and lists every exception with its reason.
• Monday midday: reminders to client supervisors go out after a payroll clerk approves the batch, one message per supervisor.
• Tuesday: the agent rechecks the list and sends what is still open to the account manager, with the dollar amount at stake.
• After payroll: the agent drafts a correction for each rejected VMS invoice, and billing resubmits.

Controls for anything that touches pay or billing

Payroll errors reach workers' pay and clients' bills, so the controls are stricter than for a draft email. Agree them with your payroll lead before the agent reads a single timesheet, and review them after the first month.

• The agent reads from the back office and the VMS. Any write access is limited to notes and draft messages.
• Every exception records the source values it compared, such as the order rate and the timesheet rate.
• Every correction is made by a named person, and the log shows who made it and when.
• Supervisor reminders use templates your team approved before the first one goes out.
• A weekly report shows exceptions open at payroll cutoff and invoices rejected, broken out by client.

Worked example: exception hours for 600 temps

This is an illustrative example with assumed numbers, not a client result. Take a light industrial firm with 45 internal staff and 600 temps on assignment each week. It has 25 clients, four of them on a VMS. Assume 10% of timesheets have an exception, so 60 a week, and each takes 15 minutes to sort out today. That is 900 minutes, or 15 staff hours. Add 10 rejected VMS invoices a week at 30 minutes each, another 5 hours, for 20 hours in total.

Now assume 80% of the timesheet exceptions are routine, such as a missing approval or a missing punch. That is 48, each needing about 4 minutes of review once the agent has prepared it, so 192 minutes. The other 12 still take 15 minutes each, 180 minutes. Timesheet exceptions fall from 15 hours to 6.2 hours.

For invoices, assume 60% of rejections are routine, such as a PO number or a rate field format. Six take 10 minutes of review and four take the full 30, so 180 minutes, or 3 hours instead of 5. Together, the week falls from 20 hours to about 9.2, which gives back about 10.8 staff hours. The calculator below covers the timesheet exceptions only. Two measures matter to an owner as much as the hours: invoices paid on first submission and days sales outstanding on VMS clients. Use your own numbers for both.

Starting small with exceptions

Pick one VMS client and one payroll week. Export the week's timesheets and rejected invoices, and have the agent list the exceptions with reasons. Compare its list with what your payroll team actually fixed, and count what it missed and what it flagged wrongly. Two or three weeks give a fairer picture than one if your volume swings around holidays or large new orders.

Check first whether your back office already connects to each VMS you bill through. Where it does not, our five-day AI Workflow Sprint costs $2,500 and builds a working prototype on a redacted copy of one week of data, with a full refund if we do not find 10 staff hours a week. The fee comes off the build, which starts from $7,500 per workflow, and running it costs $1,200 a month.

Common questions