Construction WIP Schedules: What Sureties Look For

What a WIP Schedule Is Really Trying to Measure

Strip away the columns and the work-in-progress schedule is answering one question, job by job: how much of this contract has actually been earned so far, compared to how much has been billed and how much cash has come in. Everything else on the schedule — estimated cost to complete, contract value, billings to date — exists to support that one comparison.

That matters because a contractor’s income statement, on its own, can’t answer this question for a multi-month job. Revenue recognized under percentage-of-completion accounting isn’t the same as cash collected, and billings issued aren’t the same as revenue earned. The WIP schedule is the bridge between those three numbers, at the job level, updated as the job progresses rather than reconstructed once a year.

A surety reading your WIP is really asking whether you know, in real time, where every active job actually stands — not whether the company as a whole had a good year. A strong overall P&L with a messy WIP behind it tells a surety the good year might be luck, process, or both, and they have no way to tell which from the P&L alone.

Cost-to-Cost Percentage Complete in Plain English

The cost-to-cost method is the most common way contractors calculate how much of a job is actually done: costs incurred to date, divided by total estimated cost for the job. If you’ve spent $600,000 of an estimated $1,000,000 total cost, the job is treated as 60% complete — and 60% of the contract’s total revenue is recognized as earned, regardless of what’s been billed or collected.

The method is only as reliable as the estimated total cost, which is why a job’s numbers can shift meaningfully when a cost estimate is revised — a change order, a material price increase, or a subcontractor scope change all move the denominator, which moves percentage complete, which moves earned revenue, even if nothing about billing or cash has changed that day.

Estimated cost to complete is the number that quietly runs everything

Of all the inputs on a WIP schedule, estimated cost to complete is the one most often updated too slowly. A project manager who hasn’t revised their cost-to-complete estimate in two months is effectively telling the WIP schedule that nothing has changed on the job — which is rarely true on an active project. Sureties who have seen this pattern before tend to ask about it directly: how often are cost-to-complete estimates updated, and by whom.

Overbilling and Underbilling Without the Jargon

Billings in excess of costs — overbilling — means you’ve invoiced the client for more than the percentage-of-completion method says you’ve actually earned so far. Costs in excess of billings — underbilling — means the reverse: you’ve earned more than you’ve billed. Both show up as line items on a WIP schedule, and both are normal in isolation.

The jargon obscures a fairly intuitive idea: overbilling is money you’re effectively holding before you’ve earned it, and underbilling is money you’ve earned but haven’t asked for yet. A surety wants to see that both are understood and managed, not that either is avoided entirely — because avoiding both entirely usually isn’t realistic on a real construction schedule.

What Margin Movement Tells a Surety

Estimated gross margin on a job — contract value minus estimated total cost — is not supposed to be static. It moves as a project unfolds, as change orders are approved, and as actual costs come in against the original estimate. What a surety is watching for is not movement itself, but the direction, size, and explanation behind it.

Margin fade in particular is treated as a leading indicator, not a lagging one. A surety who sees the same jobs losing a point of margin every reporting period is watching a trend they’ve seen before, in other contractors, in the run-up to a bonding problem — which is exactly why catching and explaining it early, before it becomes a pattern across your whole job list, is worth more than a clean-looking total at any single point in time.

Why the WIP Must Reconcile to the Financial Statements

A WIP schedule that doesn’t tie out to the balance sheet and income statement is, from a surety’s perspective, not a WIP schedule at all — it’s a separate document that happens to describe the same jobs. The costs and earnings recognized job-by-job on the WIP should sum to the revenue, cost of revenue, and the over/underbilling asset or liability lines that appear on your financial statements for the same period.

This reconciliation is also one of the most common places small discrepancies quietly accumulate — a change order recorded on the WIP but not yet reflected in accounting, a cost booked to the wrong job, a billing entered twice. None of these individually sinks a bonding review. A pattern of them, discovered by the surety instead of disclosed by the contractor, changes the conversation from “here’s an update” to “what else hasn’t been caught.”

The Questions to Answer Before Your Next Bonding Review

Before the WIP schedule goes out the door for a bonding or lending review, a short internal check tends to catch what a surety would otherwise catch first.

Source framework
The concepts referenced in this guide align with surety-submission and financial-reporting guidance published by NASBP and construction-industry financial management resources published by CFMA, along with applicable accounting and revenue-recognition guidance. Your surety’s specific submission requirements should be confirmed directly with them.

Frequently Asked Questions