Why a profitable construction job can still run out of cash

Profit and cash are different questions

A forecast margin compares expected project revenue with expected final project cost. Cash flow asks when money comes in and when obligations have to be paid. A profitable job can still consume cash if supplier and subcontractor payments fall ahead of client receipts.

Common causes of project cash pressure

• Progress claims lagging behind physical progress.
• Large deposits, material purchases or subcontract mobilisation paid before the next client claim.
• Retention, disputed claims or delayed variation approval.
• Tax liabilities accumulating while project cash is used elsewhere.
• Multiple projects reaching procurement-heavy stages at the same time.
• Margin erosion reducing the cash buffer that was expected at tender.

Why forecast visibility still matters

A cash-flow forecast without a current cost forecast is fragile. If the project is actually heading toward a $70,000 overrun, the expected future cash surplus is also wrong. The cost forecast therefore informs the cash model even though it does not replace it.

Watch commitments before invoices

Committed cost is especially important for liquidity. The business may not have paid the subcontract yet, but the obligation is already real. Looking only at bank balance and accounts payable can understate the cash still required to finish the project.

Practical management response

• Keep project forecast final cost current.
• Maintain a short-term cash forecast based on expected receipts and committed payments.
• Separate approved revenue from hoped-for variation recovery.
• Track tax and statutory liabilities outside operating cash.
• Review portfolio-level procurement peaks, not just individual project profitability.