Committed Cost versus WIP: what helps your Team Manage their Project Better
Ask a project manager how a job is tracking, and you’ll often get two different answers depending on what number they’re looking at.
One shows what’s actually been spent and claimed so far. The other shows what’s already been committed and forecast, through purchase orders, subcontracts, timesheets and variations, even if the invoice hasn’t landed yet.
Both numbers matter. Relying on just one of them is where a lot of construction teams get caught out. WIP makes the accountants happy, but commitments and forecasts give your project team better tools to manage their jobs.
What is Work in Progress?
Work in progress, or WIP, generally reflects the value of work completed and forecast on a project at a given point in time, whether or not it’s been formally claimed or invoiced yet.
It’s a useful snapshot of progress, and it’s often the figure used in monthly reporting to show how a project is tracking against budget.
The problem is that WIP alone doesn’t tell the whole story. It reflects what’s happened, not necessarily what’s already forecast for later.
What is Committed Cost?
Committed cost reflects the value of work and materials that have already been agreed through issued purchase orders, signed subcontracts, unapproved variations, and timesheets, regardless of whether the cost has hit the books yet.
This is the money that’s already spoken for, even if it hasn’t shown up as an actual cost or claim in the current reporting period.
A project can look perfectly healthy based on WIP alone, while committed costs quietly tell a very different story about what’s still to come.
Why Relying on Just One Number is Risky
Looking at WIP without committed and forecast cost is a bit like checking your bank balance without accounting for cheques that haven’t cleared yet.
The money might still be sitting there on paper, but it’s already spoken for. Spend against it, and you’re heading for trouble, even though the numbers looked fine a moment ago.
On a construction project, this shows up as budgets that appear on track right up until a wave of committed costs, subcontractor claims, retentions, material deliveries or approved variations, all at once and push the project over budget with little warning.
Bringing both Numbers together
The real value comes from viewing committed cost and WIP side by side, rather than treating them as separate reports that get checked at different times, if at all.
CATProjects brings job costing and subcontract management into the same system, so committed costs from purchase orders, time entry, variations and subcontracts are visible alongside the value of work actually completed.
That combined view gives project managers and site teams a much more honest picture of where a project genuinely stands, rather than a partial view based on WIP alone.
What this Looks like Day to Day
For a project manager, having both figures visible together changes the kinds of questions that get asked.
Instead of just asking “how much have we spent so far?”, the conversation becomes “how much have we spent, and how much more is already committed or forecast that hasn’t hit the books yet?”
That second question is often the one that actually predicts whether a project is heading for trouble, well before it shows up in a traditional progress claim or monthly report.
Help Operations Teams make Better Day-to-Day Decisions
Commitmentals help project management teams benefit from this visibility, giving them tools for forecasting and calculating the cost to complete.
Knowing how much budget is genuinely still available, once committed costs are accounted for, helps operational decisions get made with much more confidence. Whether it’s approving an additional purchase order, agreeing to a variation, or deciding whether there’s room to bring a trade on earlier.
Without that visibility, it’s easy for operations teams to unintentionally commit a project beyond its remaining budget, simply because the true financial position wasn’t clear when the decision was made.
Reduce End-of-Month Surprises
One of the most common frustrations for project teams is a budget position that looks fine right up until it suddenly doesn’t.
When committed cost isn’t tracked alongside WIP, this often shows up as a nasty surprise at month’s end, when a batch of subcontractor claims, variations, retentions or supplier invoices arrives all at once and pushes the project past budget with little warning.
Keeping committed costs visible throughout the month, rather than reviewing actual costs only at reporting time, reduces much of the surprise. Problems become visible as commitments are made, not weeks later when the invoices finally arrive.
Purchase Orders are often where the Gap begins
A large share of committed costs typically begins with purchase orders, materials, plant hire, and trade packages ordered as the project progresses.
When purchase orders are raised outside the main job costing system, on paper, in email, or through a separate spreadsheet, they’re easy to lose track of. The order is real, and the cost is coming, but it hasn’t been reflected anywhere that would affect the project’s reported financial position.
Issuing purchase orders directly through the same system used for job costing helps close that gap. As soon as an order is raised, it’s reflected as a committed cost, rather than existing only as a document sitting in someone’s inbox until the invoice eventually arrives.
Variations deserve the same Treatment
Unapproved variations are another common source of committed cost that often isn’t reflected quickly enough.
A variation might be agreed on site, confirmed by email, and the additional work already underway, well before it’s formally priced and entered into the project’s cost records.
In the meantime, that additional cost is real and committed, even if it isn’t yet visible in the numbers anyone is looking at. Treating variations with the same discipline as purchase orders and subcontracts, recording them as committed as soon as they’re issued, keeps the overall committed cost picture accurate and current.
Frequently Asked Questions
What’s the difference between committed cost and WIP? WIP reflects the value of work actually completed so far. Committed cost reflects money that’s already been agreed through purchase orders, subcontracts and variations, even if it hasn’t been invoiced or claimed yet.
Why isn’t WIP enough on its own? WIP only shows progress to date. It doesn’t reflect costs already locked in but not yet on the books, which can make a project look healthier than it actually is.
How does CATProjects help track both? CATProjects brings job costing, timekeeping, variations, claims, purchasing, retentions and subcontract management into one system, so committed costs and WIP can be viewed together rather than checked separately.
Is this only useful for large projects? No. Committed cost and WIP matter on projects of any size. CATProjects is configurable for businesses of different sizes, making this visibility accessible for growing Main Contractors and Subcontractors as well as larger, established ones.
Does WIP help site and project teams, or just accounts? Primarily accounts. While accounts teams use this data for reporting, project managers and site teams rely on commitments to support forecasting and cost-to-complete estimates.
Get a Clearer Picture of where your Project stands
A project that looks healthy based on WIP alone can still be heading for trouble once committed costs are properly accounted for.
With more than 25 years of experience supporting Australian and New Zealand construction businesses, Construction Software (Asia Pacific) built CATProjects to give Main Contractors and Subcontractors a genuine, combined view of committed costs and WIP, not just half the picture.
If you’re ready to see the full financial position of your projects, contact the team at CATProjects today.
