WIP & Job Costing

The document your bonding agent won’t let you skip

If you’ve been bonded for any length of time, you already know the drill. Somewhere in the renewal packet, alongside the financial statements and the personal indemnity forms, there’s a request for an updated work-in-progress schedule. It’s easy to treat this as one more piece of paperwork standing between you and the bond you need. It isn’t. It’s the document your surety trusts more than almost anything else in the file, and understanding why changes how seriously you treat it.

What a WIP Schedule Actually Shows

A work-in-progress schedule takes every active job and lines up three things that, on their own, tell you very little: what you’ve spent so far, what you’ve billed so far, and what you now believe the job will actually cost to finish. From that comparison, it calculates a job’s percentage of completion and translates that into recognized revenue and gross profit — not the revenue you’ve invoiced, but the revenue you’ve actually earned based on where the job really stands.

That distinction is the entire point. A contractor can be cash-flush and profit-blind at the same time, invoicing ahead of the real progress on one job while quietly falling behind on another. A WIP schedule is what surfaces that gap. It’s also what exposes the two conditions every bonding agent is specifically trained to look for: underbilling, where a contractor has done more work than they’ve invoiced for and is essentially financing the job out of pocket; and overbilling, where a contractor has invoiced ahead of the actual progress and is using this job’s cash to plug a hole somewhere else. Either one, left unmanaged across a portfolio, is how profitable-looking contractors end up in real trouble.

Why the Surety Cares So Much

A surety isn’t extending you a loan. When they issue a bond, they’re pledging their own capital that you will perform, and if you don’t, they’re the one who has to step in and pay to get the job finished. Before they take on that risk, they need a credible answer to a simple question: is this contractor’s backlog actually as healthy as their income statement suggests?

A surety who trusts your WIP schedule extends more capacity, on better terms, with fewer questions.

The WIP schedule is where that trust gets built, or lost. A surety underwriter who sees consistent, accurate WIP reporting is looking at a contractor who understands their own jobs in real time — cost overruns, estimate accuracy, billing discipline — and can course-correct before a problem becomes a claim. A surety who sees WIP data that’s inconsistent, hand-assembled at the last minute, or absent entirely is looking at a much bigger unknown, and underwriters price unknowns conservatively. That shows up as reduced bonding capacity, more restrictive terms, or a renewal that takes far longer and asks far more questions than anyone wants to answer.

Why This Is Harder Than It Looks

A WIP schedule sounds like a spreadsheet exercise, and that’s exactly where the trouble usually starts. The inputs behind it — actual job costs, revised cost-to-complete estimates, billed-to-date figures — have to come from a job costing system that’s actually tracking each job correctly, cost code by cost code, not from a general ledger that lumps everything into “materials” and “labor.” Estimated costs to complete need to be revised as the job progresses, not left frozen at the original bid number, or the whole percentage-of-completion calculation quietly drifts away from reality. And it needs to happen consistently, job after job, month after month — not reconstructed under deadline pressure the week a bonding renewal is due.

This is also where a lot of contractors get burned without realizing it. A WIP schedule built on stale cost estimates, or one that treats every job as being exactly as profitable as originally bid, can look clean on the surface while hiding the exact problems a surety is trained to find. It doesn’t take an adversarial underwriter to catch this — it takes one who’s seen a thousand of these schedules and knows what a real one looks like.

The Real Takeaway

A WIP schedule isn’t a form you fill out because a surety asked for it. It’s an ongoing discipline — built on job costing that’s actually accurate, cost estimates that get revised as jobs evolve, and a consistent monthly process — that happens to produce the exact document your bonding agent, your lender, and eventually a buyer will all want to see. Getting it right isn’t about assembling numbers once a year under deadline. It’s about having a system that keeps those numbers honest all the time, so that when someone asks, the answer is already sitting there, ready.