Cashflow Forecasting in Construction
Profitable-looking contractors still go under. Cashflow forecasting shows when money actually moves — applications, certification, retention, supplier payments — and where the gaps are.
Construction businesses rarely fail because a job made no profit on paper. They fail because the cash ran out before the profit arrived. Profit is an opinion formed at the final account; cash is a fact that lands (or doesn't) every month.
Profit and cash are not the same
A job can show 8% margin in the cost report while draining the bank account. Front-loaded costs, materials on site not yet certified, retention held, and a slow paying client all separate profit from cash. A cashflow forecast maps when money actually moves, not when it is earned.
Monthly applications drive everything
The application for payment is the engine of contractor cashflow. Missing an application date usually means waiting a full extra cycle for that money. A forecast built around the contractual payment calendar — application date, due date, final date for payment — shows exactly what should land and when, and makes slippage visible immediately.
Retention
Retention of 3–5% might not sound like much, but across several live jobs it is often a full month's overhead sitting in other people's bank accounts, with half of it locked away until the end of the defects period. Forecasting retention release dates — and chasing them — is free money recovery.
Delayed certification and under-certification
Forecasts must reflect reality: if the client's QS routinely certifies 90% of what you apply for, forecast that. Under-certification compounds — the shortfall rolls forward, disputes accumulate, and the gap between your ledger and your bank widens. Tracking applied-versus-certified each month shows whether a job is quietly building a dispute.
Supplier and subcontractor payments
Cash out matters as much as cash in. If your suppliers are on 30 days and your employer pays in 60, you are financing the project. Aligning subcontract payment terms with the main contract — and forecasting both sides — shows the real funding requirement month by month.
Forecast final account and cost to complete
A live forecast final account (current contract sum, agreed variations, pending changes, claims at realistic values) alongside a genuine cost-to-complete tells you the margin the job will actually finish at — not the margin the tender promised. Reviewed monthly, this catches deteriorating jobs while there is still time to act.
Why contractors fail with profitable-looking jobs
Growth is the classic trap: each new job consumes cash before it generates any, and winning three jobs at once can sink a business that any one of those jobs would have made money on. A business-level cashflow forecast across all live and secured work is what turns "we're busy" into "we're safe".
EdgelineQS builds monthly project cashflow forecasts, supports applications for payment, and provides cost-to-complete and forecast final account reporting for contractors across the UK.
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