WIP Schedules: Over- and Under-Billing

The Work-in-Progress (WIP) schedule is the most important report in construction accounting. Bankers and sureties read it first.

What it shows

For each open job: contract value, estimated cost, costs to date, % complete, billed to date, and earned revenue. From that it derives:

• Overbilling (billings in excess of costs/earnings) — you've billed more than you've earned. Common and useful for cash flow, but it's essentially borrowed from the job; don't spend it as profit.
• Underbilling (costs/earnings in excess of billings) — you've done more work than you've billed. It ties up your cash and can signal billing or estimating problems.

Why sureties and lenders care

The WIP reveals profit fade, hidden losses, and whether you're financing your jobs with overbillings. A clean, accurate WIP raises your bonding capacity and credibility. A messy one scares the people who fund you.

Going Deeper (Intermediate)

The Work-in-Progress (WIP) schedule is the contractor's most important report. For every open job it lists: contract value, costs to date, estimated total cost, % complete, earned revenue, billed to date, and the resulting over- or under-billing.

• Overbilled (billings > earned revenue) = "billings in excess of costs" → a liability.
• Underbilled (earned revenue > billings) = "costs in excess of billings" → an asset.

Advanced / Pro-Level

How bankers and sureties read the WIP:

• Overbillings help cash now but are "borrowed from the future" — that work still must be performed; heavy overbilling can mask a cash problem hiding in plain sight.
• Underbillings are a red flag — usually unbilled work, cost overruns, or sloppy billing; it means you financed the owner's project with your cash.
• Fade/gain analysis: did estimated margins fade as jobs progressed? Consistent fade signals weak estimating or PM.
• A clean, accurate WIP is what unlocks bonding capacity and bank lines — it's your financial credibility.

Practice Challenge

A job has earned $500k of revenue (cost-to-cost) but you've billed $620k. Over- or under-billed, and what's the caution? (Answer: overbilled $120k (billings in excess) — a liability and a cash boost, but that $120k of work is still owed; don't mistake the cash for profit.)

In Practice

A bank asks for your WIP schedule before extending credit. A clean one showing controlled billings builds trust; a messy one full of overbillings scares them off.

Common Mistakes to Avoid

• Not maintaining a WIP schedule
• Spending overbillings as if they were profit
• Ignoring the profit fade the WIP reveals

Takeaway: A clean WIP schedule raises your bonding capacity; a messy one scares your lenders.

Educational content — not legal, accounting, or licensing advice. Rules vary by state and change; verify with the licensing board and a CPA.