In the first 90 days of a new engagement, we almost always find the same thing: a supplement backlog that the previous bookkeeper didn't know existed and the owner assumed had been collected.
Supplements don't disappear because of fraud. They disappear because of friction — the gap between where they're approved (the carrier's portal) and where they need to land (the books). Nobody's lying. The workflow just doesn't close the loop.
The Three-Stage Leak
Supplement revenue has three stages at which it can disappear:
Stage 1: Submission to approval. Supplements submitted to the carrier that never get followed up on. If your project manager submits a supplement and then moves on to the next job without a tracking system, that supplement may sit in the carrier's pending review indefinitely. No one calls. It never gets approved. The revenue is gone.
Stage 2: Approval to invoicing. A supplement gets approved, but the approval notification goes to the PM's email, the PM notes it in a job management platform, and it never gets formally invoiced. Or it gets invoiced but under the original job invoice rather than as a supplemental line, so the payment tracking is ambiguous.
Stage 3: Invoicing to books. The supplement is invoiced and the carrier pays it — but the payment hits the bank as a lump sum that gets applied to the original job invoice, leaving the supplement itself unreconciled. The money arrived. Nobody knows which supplement it was for.
Each of these stages requires a different fix. The total leak is the sum of all three.
What the Numbers Look Like
For a restoration company doing $2M in annual revenue, with a reasonable mix of water, fire, and storm jobs:
- Average supplement per job (approved): $4,200–$6,800
- Average supplement approval rate: 65–78% of submitted scope
- Estimated uncollected supplements due to workflow failure: 12–18% of total approved supplements
At the lower end of those ranges, a $2M company is leaving $38,000–$54,000 per year on the table. That's not a projection — it's a recurring finding in our cleanup engagements.
The Fix: A Supplement Register
The workflow we install is a supplement register — a running ledger, maintained in parallel to the books, that tracks every supplement from submission through final payment. It includes:
- Job number and carrier
- Date submitted
- Scope items and dollar amount submitted
- Carrier review status and date
- Approval amount (often less than submitted)
- Invoice date
- Payment date and amount received
- Variance (approved vs. received)
This register gets reconciled against the books monthly. Any supplement that's been approved but not received gets flagged for PM follow-up. Any supplement that's been received but not posted correctly gets corrected in QBO before the month closes.
The register itself isn't complicated — we maintain it in a shared spreadsheet for most clients, or inside their job management platform if it supports it. The discipline is in the reconciliation. When you make it a monthly close requirement, the leak stops.
Backfilling Historical Supplements
For companies that have been operating without a supplement register, there's typically a backlog of approved-but-uncollected supplements going back 6–18 months. This is recoverable in most cases.
Carriers are legally obligated to pay approved supplements. If you have documentation that a supplement was approved — an email from the adjuster, a portal notification, a revised XactAnalysis report — you can submit a demand for payment. Most carriers will process it without dispute if the documentation is clean.
We've collected $38,000 in a single quarter for one client just by going back through closed jobs and pulling approval records. The money was sitting in the carrier's system waiting for an invoice that was never generated.
Related reading: The Hidden Cost of Generic Bookkeeping for Restoration Contractors · The Complete Guide to Insurance Billing Accounting for Restoration · AR Days Outstanding for Restoration: What's Normal vs. What's a Problem