How to Use Cost-to-Complete for Subcontractor Jobs

Last updated: August 2026

Job profitability tracking becomes useful when it shows where a job is headed before closeout. Cost-to-complete gives subcontractors that forward view by combining what the job has already consumed with an honest forecast of what remains. The arithmetic takes one line; the value comes from current inputs and early action. If labor production slips, commitments pile up, or change work gets absorbed into base scope, the projection should show it while there is still enough job left to respond.

For the cost-capture side, see Job Costing for Subcontractors: A Practical Guide. That guide covers how costs get captured. This piece covers the projection those costs feed and the decisions it should trigger.

What is cost-to-complete?

Cost-to-complete is the forecast of the remaining cost required to finish the job. Estimate at completion, or EAC, equals costs to date plus cost-to-complete. Compare EAC with the cost budget to see projected cost variance; projected gross profit equals current contract revenue, including approved changes, minus EAC, and projected gross margin equals that profit divided by current contract revenue.

The forecast should include remaining committed costs plus the labor, material, equipment, supervision, and other uncommitted costs still expected to finish the work.

The common mistake is treating original budget remaining as the forecast. If the job has changed, the forecast has to change with it.

How do you know if percent complete is believable?

For cost-to-cost reporting, percent complete is calculated as costs to date divided by the current estimated total cost. That is useful, but cost does not always move in step with physical progress.

Budget spent is not work completed.

A mechanical contractor can buy equipment early. A drywall contractor can stage material before installation catches up. A concrete subcontractor can carry major early costs while later labor-intensive work is still ahead.

Before trusting the percentage, re-walk the remaining work with the foreman or project manager. Let the cost report show what has been consumed, then let the field confirm what is installed and what remains.

For the broader operating view, see What Project Management Actually Means for a Specialty Subcontractor.

When should the estimated total cost change?

Whenever job conditions change enough to alter what finishing the work will cost.

A frozen estimate at completion is how profit fade gets discovered at closeout. If production is slower than estimated, access tightens, sequencing changes, remobilization becomes likely, overtime appears, or a material assumption changes, revise the remaining-cost estimate.

The original estimate still matters as the baseline, but it should not override current field reality. For the estimating workflow that creates that baseline, see 8 Estimating Workflow Lessons for Fewer Bid Errors.

Your system can live in a spreadsheet, accounting software, or project platform. What matters is that the projection reflects what the team knows now.

Do committed costs belong in cost-to-complete?

Yes. If the company has already committed to spend the money and the cost has not yet hit actuals, it belongs in the remaining-cost picture.

Open purchase orders, executed subcontracts, rentals, vendor commitments, and approved purchases can change the outlook before accounts payable receives an invoice. A job that looks healthy on invoiced costs can already be tight once those obligations are included.

Keep actual costs separate from outstanding commitments, then forecast only the uncommitted work beyond them. That prevents double counting.

Why is labor productivity an early-warning input?

Labor often tells you the projection is moving before the monthly financial report does.

Track hours per unit installed against the estimate. If the estimate carried 0.40 labor hours per unit and comparable installed work is consistently taking 0.55, the remaining labor forecast needs another look.

Then find the reason. Check crew mix, supervision, access, sequencing, rework, and interference from other trades. The problem may also be in the estimate itself.

Hours per unit turns the forecast from a broad opinion into an operating signal. For the burdened-rate side, see Why Your Labor Costs Are Probably Wrong and What It’s Costing You on Every Job.

What should you do when the projection slips?

Check crew mix and supervision first. A struggling job may need a stronger foreman, a different mix of journeymen and apprentices, or fewer people working over one another. Adding labor without understanding the production problem can make the miss worse.

Next, sweep for unpriced change work being absorbed as base scope. Ask the foreman what the crew is doing today that was not part of the original handoff. Changed routing, added supports, rework, owner requests, and field directives can quietly burn base labor before a formal change reaches the office. For the recovery side, see The Change Order Problem: Why Subcontractors Are Leaving Money on the Table After the Bid Is Won.

Then re-walk percent complete with the foreman. If the office says the job is 70 percent complete but the field can point to rough-in, trim, testing, punch, or remobilization still ahead, the percentage needs another look.

Finally, escalate with the GC while there is job left to fix. If access, sequence, late decisions, or stacked trades are driving the miss, the team may still be able to change the plan.

The worst version of a bad projection is one nobody acts on because everyone is waiting for certainty.

How often should subcontractors update cost-to-complete?

Review active jobs in trouble weekly. For stable jobs, biweekly is a practical rhythm.

Once actual costs, commitments, labor production, change exposure, and percent complete are flowing consistently, target a five-minute review per job. Focus on three questions: What changed? Why did it change? What action follows?

The number earns its value by arriving early. A perfect answer after closeout cannot recover margin already gone. A reasonably accurate projection in week six can still influence crew decisions, change-order follow-up, GC conversations, and the next estimate.

If accounting reports still leave this operating gap, see Why Can’t QuickBooks Tell Me If a Job Made Money?. For the software-evaluation side of margin visibility, see 7 Margin Tracking Lessons in Subcontractor Software.

FAQ

What is cost-to-complete in construction?

Cost-to-complete is the current forecast of what it will cost to finish the remaining work on a job. For a subcontractor, that means including outstanding commitments, remaining labor and material, and known job conditions instead of simply subtracting costs to date from the original budget.

How do you calculate estimate at completion?

Estimate at completion, or EAC, equals costs already incurred plus the current cost-to-complete forecast. Compare EAC with the cost budget to see projected cost variance, then compare EAC with current contract revenue, including approved changes, to calculate projected gross profit and gross margin.

What is profit fade?

Profit fade is the reduction in expected job margin as a project progresses. It can appear when remaining costs rise, labor production falls behind the estimate, commitments were missed, or change work is being absorbed without recovery. Cost-to-complete helps surface that movement before closeout.

How often should subcontractors update cost projections?

Review jobs with active problems weekly and stable jobs about every two weeks. The exact cadence matters less than whether the forecast arrives early enough to drive action. Once the inputs are current, keep the review brief and focused on what changed, why, and what needs to happen next.

Win-rate tracking shows where estimating effort converts into work. Most Subs Don’t Know Their Win Rate. It’s the Most Expensive Number They’re Not Tracking. covers that preconstruction side of the feedback loop. Cost-to-complete shows whether the work you won is performing the way you priced it, so those outcomes can inform the next estimate.