Committed costs,
the money already promised.

Every cost on a residential job passes through three states. It is budgeted when the winning estimate becomes the baseline and a line says what the work should cost. It is committed the moment the builder promises the money to someone, by issuing a purchase order, signing a subcontract or acting on an accepted quote. It is actual when the invoice arrives and the accounts record what the work did cost. The three states, and the discipline of managing the gaps between them, are the subject of the construction cost control reference. This node is about the middle state, because the middle state is the one most builders cannot see.

Defined precisely, a committed cost is money the business is already obliged to pay for work or materials on a job, where the obligation exists but the invoice does not yet. The commitment is created by the decision, not by the document. The purchase order and the subcontract record commitments; the phone call that told the supplier to proceed created one just as surely, whether or not any paper followed. A committed position is simply the running total of those promises, line by line, against the budget.

Why it matters

By the time an invoice arrives, the money it represents was spent weeks earlier, on the day the order was placed or the subcontract was signed. The invoice is a receipt for a decision already made. The decision window, the point where a different choice was still available, was at commitment. A builder whose reporting starts at the invoice is reviewing decisions long after they stopped being decisions, which is why committed cost is the earliest true signal that a job is drifting, and the last point at which drifting is cheap to correct.

The committed position begins where the estimate to budget handover ends, because commitments can only be measured against a baseline that survived the handover at line level. From there, purchase orders and subcontracts create the commitments, and receiving and invoice matching closes them, converting committed value into actuals as the bills arrive. What binds the whole chain together is structure. When budget lines, orders and invoice coding share one set of cost codes, budgeted versus committed versus actual is a report; when they do not, it is a research project.

Downstream, the committed position is one of the three inputs to any honest forecast of where the job will land, alongside actuals and the forecast for the scope not yet bought. The wider discipline this node belongs to is covered in the builder cost tracking guide; this page is about the state of a cost that most reporting skips over entirely.

The operator's summary of invoice-based job costing is blunt. A builder who only tracks paid costs is driving by the rear-view mirror, and the mirror is running on roughly a two-month delay, the gap between the day money was promised and the day the paid report finally shows it. Everything in that mirror is true and none of it is current. The jobs it describes are the jobs as they stood when those orders were placed, which is why a business can report healthy for months while quietly committing its margin away on live sites.

The second thing experienced operators know is that a committed position is only as good as the discipline that feeds it. The honest committed total is built one habit at a time, the commitment raised before the work, every time, including the awkward cases, the phone order placed from the ute and the site instruction given at the boundary fence. Both commit money the moment the words are said, and both exist nowhere until someone records them. A pattern many builders will recognise is the invoice that arrives above the price agreed on the phone, and the dispute that collapses because the original rate lives in nobody's files. The order-first habit is covered practically in the purchase order workflow guide.

The test seasoned builders apply is deliberately mundane. Could the office state any live job's committed total this afternoon, without anyone starting a reconciliation exercise? If the answer requires pulling orders from a folder, ringing the supervisor about what has been instructed, and an evening of matching, the business does not have a committed position, it has the raw materials for one. Many builders find that evening of reconciliation is exactly where their week goes, days on the tools and nights re-assembling what the systems should have held.

Where software fits the workflow

Traditionally the budget lives in a spreadsheet, the orders in a folder, and the actuals in the accounting file, and the committed position is assembled by hand whenever someone worries. In VIABUILD the three states share one structure. The budget arrives line by line from the estimate, purchase orders and subcontracts raise commitments against those same lines, and cost tracking shows budgeted, committed and actual per cost code as the working view rather than a month-end exercise. Oryn™ reads each incoming invoice in the context of the order behind it, so an invoice above the committed price surfaces as a discrepancy to resolve, with the original rate on record, instead of a quiet overrun discovered at reconciliation. The builder still makes every call; the system's job is to make the committed position a fact rather than a project.

Committed cost tracking is internal management practice rather than a regulated activity, but several Australian realities shape how it has to work. The points below are labelled by evidence class; practices differ between businesses and change over time, so confirm anything that touches your accounts with your own advisers.

• Common practice. Most small Australian building businesses run their books in a small-business accounting package, which records a cost when a bill is entered or paid. On trade account terms the gap between placing an order and the invoice being entered commonly runs to weeks, so a builder job-costing out of the accounting file has no committed position by construction, not by oversight.
• Professional recommendation. Reporting job cost against commitment, not just against payment, is standard cost-management practice in Australian quantity surveying and professional cost control. The AIQS publishes professional guidance on cost management practice; the principle scales down to a residential builder with a purchase order register.
• Common practice. Budgets and estimates are commonly held excluding GST while supplier invoices arrive including it. A committed position has to keep the comparison like for like, or every line carries a phantom overrun of roughly the GST margin. Confirm the treatment for your structure with your accountant.
• Common practice. Whether your business reports on a cash or accrual basis is a tax and reporting matter between you and your accountant, and nothing in a committed cost report replaces it. The committed position is a management view that sits alongside the accounts, not inside them.

Illustrative only, not a benchmark. A job carries a budget line of $60,000 for windows and glazing. The supplier's quote comes back at $67,000 and the builder accepts it and places the order. In a commitment-based view, the line shows $7,000 over budget on the day the order is raised, weeks before manufacture begins. The overrun is a decision. The builder can respecify one bank of windows, negotiate the price, or accept the hit deliberately and plan to claw it back on another package, and any of those choices is still open.

Run the same order through an invoice-based view instead. The windows are manufactured, delivered and installed, the invoice arrives on the supplier's terms, and it is entered when the bookkeeping catches up. The $7,000 surfaces weeks after the decision that caused it, with the windows already in the wall. Nothing about the overrun changed except the moment it became visible, and that moment is the difference between a decision and a fact. Multiply this one line by every package on every live job, and that is the argument for tracking commitment.

Committed cost (money promised by an order, subcontract or instruction, not yet invoiced), actual cost (what invoices record), accrued cost (an accounting recognition of work received but not yet billed), uncommitted budget (budget minus committed minus forecast remaining), commitment residual (the difference between a commitment and its final actual), purchase order register (the running record of live commitments), variance at commitment (budget against committed on the day the promise is made). Definitions for the wider vocabulary live in the construction glossary. From here, the natural next article is cost to complete, the forecasting discipline that turns a committed position into a view of where the job will actually land.

• Australian Institute of Quantity Surveyors , professional guidance on cost management practice, including reporting cost against commitment.
• Your own purchase orders, subcontracts and site instructions on each job, the primary record of what has actually been promised and at what price.
• Your accountant, for how accruals, GST treatment and cash versus accrual reporting apply to your business structure.