Budget vs Committed Cost vs Actual Cost in Construction

Budget: what was allowed

The budget is the approved cost plan. It creates the baseline against which procurement and forecast movements are measured. A budget is not proof that the work can still be bought for that amount.

Committed cost: what the business has already agreed to spend

Committed cost captures awarded subcontract packages, purchase commitments and other obligations before every dollar is invoiced or paid. This matters because an accounting ledger can still look clean while the commercial obligation already exists.

Actual cost: what has been recognised to date

Actual cost is historical. It is essential for reconciliation, but by itself it cannot tell you the final outcome of an incomplete project.

Why all three matter together

Suppose a trade budget is $100,000. Only $20,000 has been invoiced, but a subcontract has already been awarded at $115,000. Looking only at actual cost says the trade is 20% spent. Looking at the commitment says the project has already locked in a $15,000 budget overrun before the remaining claims arrive.

Actual cost tells you what happened. Committed cost tells you what you have bought. The forecast tells you what the whole category is now expected to cost.

Then add the uncommitted remainder

Some work will remain outside current commitments. That scope still needs a realistic cost-to-complete allowance. Otherwise the project forecast quietly assumes unprocured work will cost nothing, which is ambitious even by construction standards.

A practical monthly review

Confirm budget and approved budget changes.
Reconcile awarded and ordered commitments.
Update actual cost and claims where relevant.
Identify uncommitted scope and known procurement quotes.
Update remaining forecast allowances.
Review the resulting forecast variance and margin.