Construction cash-flow problems: find the cause and next step
A cash shortage can come from timing, missing applications, extra costs or an unpaid balance. The right response depends on which problem you actually have.
by Jack Butler-Kettle · About 5 min readShare
What does this mean for me?
A profitable job can still run short of cash when payments arrive after costs fall due. A positive month-end balance can hide an earlier funding gap.
A timing gap needs a different response from an unpaid debt or a cost overrun. Confusing them can leave the underlying problem unresolved.
What do I need to do?
1. Find the date and cause of the shortfall
Build a short-term forecast using actual payment dates and supported expectations. Weekly periods may reveal a gap hidden by a positive month-end balance.
Check applications, assessments, invoices and actual receipts separately. An amount applied for is not necessarily agreed, due or paid.
Keep the project forecast separate from the business bank balance where other projects share that account. Explain transfers rather than treating them as project earnings.
The RICS cash-flow forecasting guidance addresses preparing and using construction forecasts. Our worked forecast example shows the basic calculation.
2. Separate the different commercial problems
Compare the forecast with the contract records, cost ledger, orders and payment history. Several causes can exist together, so do not force every difference into one explanation.
Scroll across to read all columns.
Different causes need different work What the records show Work to investigate A supported receipt moves to a later date Update timing assumptions and assess the funding gap Completed work has not been applied for Prepare the valuation and check the payment procedure The assessed amount is below the application Reconcile the difference and establish what is disputed An amount remains unpaid Check the due position, notices, evidence and recovery options Remaining costs exceed the original allowance Reforecast cost to complete and identify the cost movement Retention is included too early Check the contractual release conditions and forecast date 3. Correct applications and commercial reporting
Missing measurement, weak variation records and duplicate deductions can make the payment position difficult to assess. Trace material differences to the underlying records.
Subcontract payment assessments can prepare or assess the ordinary payment cycle. A defined application check can identify reconciliation errors and missing support.
Project cost reporting and cost value reconciliation can reconcile costs, commitments, forecast value and expected cash. Keep the cash forecast distinct from the reported margin.
4. Identify amounts requiring claims support
Where payment is overdue, record the relevant agreement, application, assessment, notices and payment history. Identify the disputed amount and any approaching deadline.
Overdue payment recovery addresses the supported payment position and recovery options. Underpayment recovery addresses an account assessed below the amount properly supported.
A cash shortage alone does not establish entitlement to extra payment or a right to stop work. Any proposed action needs its own contractual assessment.
5. Test changes without disguising the problem
Model the effect of a delayed receipt, an accelerated purchase or a change in delivery sequence. Record the assumptions and the decisions needed.
Separate agreed changes from hoped-for concessions. Moving a supplier payment in a spreadsheet does not change its contractual payment date.
If the forecast indicates difficulty meeting debts, seek appropriate accounting and insolvency advice promptly. A project QS forecast is not a solvency assessment or funding commitment.
6. Prepare a useful brief for support
Identify the project, upcoming payment dates and the amount of the forecast gap. Gather the contract, latest applications, notices, payment history and cost records.
State whether you need a one-off reconciliation, a revised forecast, regular reporting or help with a disputed amount. Explain any information gaps at the outset.
Project Partner Retainer can support an agreed recurring reporting cycle. A contested payment requires an expressly agreed claims scope.
Send an initial outline before detailed confidential documents so we can check fit, conflicts and capacity. The scope and fee are agreed before work starts.
Sources
Construction cash-flow forecasting
Use bank cash and expected payment dates, not earned value. Carry each closing balance into the next opening balance and show any funding gap.
Free blank template for your own project. The completed example is shown below. No email address required.
View the completed example
Completed fictional example
Westhaven refurbishment · 14 October 2026 · Version 1.0
Construction cash-flow forecasting
Scroll across if needed to read the whole record. A dash means no value has been entered.
| Period / scenario | Opening cash (£) | Receipts (£) | Payments (£) | Closing cash (£) | Timing / action |
|---|---|---|---|---|---|
| October baseline | £20,000.00 | £60,000.00 | £70,000.00 | £10,000.00 | Includes £25,000 client receipt expected 16 Oct |
| October delayed receipt | £20,000.00 | £35,000.00 | £70,000.00 | -£15,000.00 | £25,000 moves to November; arrange £15,000 funding or reschedule outflows |
| November after delay | -£15,000.00 | £75,000.00 | £50,000.00 | £10,000.00 | Includes delayed £25,000; opening equals October delayed close |
The first two rows are alternative scenarios, not consecutive periods. The November row follows the delayed scenario. Include VAT in cash flows where actually payable or recoverable.