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BETTESWORTHConstruction
cash flow forecasting

How to Build a Cash-Flow Forecast for a Construction Business

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A construction cash-flow forecast shows, period by period, whether the business will have enough available cash to pay labor, subcontractors, suppliers, taxes, debt and overhead while customers’ money is still moving through billing and approval. Build it in two linked layers: forecast receipts and payments for every active project, then add company-wide cash movements and the opening bank balance. For each week or month, calculate opening cash + receipts − payments = closing cash, carry that closing figure into the next period, and act on the lowest projected balance.

This is a liquidity plan, not a profit report. A job can be profitable on paper and still create a cash shortfall when costs are paid before a progress invoice is collected. Conversely, an advance or overbilling can increase cash without being earned profit.

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What a construction cash-flow forecast should answer

The forecast should answer one operational question: on each future date, how much cash is expected to be available after all reasonably foreseeable receipts and disbursements? That requires more detail than a revenue projection. The date work is performed, the date it is invoiced, the date an invoice is approved, and the date money reaches the bank may all differ. The same is true for costs: a material may be ordered today, delivered next month and paid under terms several weeks later.

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A useful forecast therefore records timing and status, not just totals. At minimum, it should make these items visible:

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  • Actual cash available at the start of the forecast.
  • Receipts by project, with billing, approval, due-date and collection assumptions.
  • Payments for payroll, subcontractors, materials, equipment and other job costs.
  • Office payroll, rent, taxes, insurance, debt service, owner distributions and other non-project movements.
  • The projected closing balance and the lowest balance in the horizon.
  • Uncertainty, such as pending change orders, late approvals, cost overruns or delayed retainage.

RICS’s Cash flow forecasting, 2nd edition, published 26 July 2024, addresses construction contract and project cash flows and notes that many principles overlap with organizational cash-flow forecasting. A company forecast must extend that project view to shared overhead, financing and bank balances.

Choose the horizon, periods and owner

Choose periods that match the decisions you need to make. A rolling weekly forecast is appropriate when payroll, supplier terms or a near-term funding gap are the main concern. Monthly periods are easier for longer-range planning and may fit tax, debt or management reporting cycles. There is no universal horizon or update frequency; set one that reflects your payment cycle, then document it.

Many contractors use a detailed 13-week weekly view for immediate liquidity and a longer monthly view for the rest of the year. That combination is a management choice, not a required industry standard. Assign one person to maintain the file or system, and assign project managers, payroll, accounts payable and billing staff responsibility for supplying changes by a stated cut-off date.

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Set the opening cash correctly

Reconcile the first period’s opening balance to the bank. Include only funds that can actually be used for the obligations being forecast. Show restricted cash, escrowed funds or amounts reserved for a lender separately where they cannot pay ordinary bills. If several bank accounts are pooled operationally, state that assumption; otherwise show each account and a consolidated total.

Define statuses before entering amounts

Use consistent labels such as contracted, approved, submitted, pending approval, forecast and collected for receipts. For costs, distinguish paid, invoiced, committed and remaining estimate. A status field prevents an unapproved request or an optimistic collection date from looking like committed cash.

Build a receipt schedule for every active project

Start with one schedule per job. Use the executed contract, schedule of values or milestones, current programme, billing records and collection history. Do not treat the contract value as a receipt forecast: only the portion expected to be billed and collected in each period belongs in the cash schedule.

Map the billing-to-cash sequence

  1. Estimate earned progress or milestone completion. Use the latest project schedule and site information, not an old baseline.
  2. Set the preparation date. Record when the application, pay request or invoice can be assembled.
  3. Set submission and review dates. Allow for the owner, architect, quantity surveyor or other reviewer to check the claim.
  4. Set the contractual due date. Apply the executed contract’s payment terms and any notice requirements.
  5. Set a realistic collection date. The due date is not proof that cash will arrive that day; use known customer behavior and current disputes to adjust it.
  6. Separate deductions. Show retainage, discounts, withholding, disputed amounts and unapplied cash rather than burying them in one percentage.

Progress billing invoices incrementally for work completed or milestones instead of waiting for final completion. Because billing date and collection date are different events, the forecast should carry both. If approval is a condition to payment, model preparation, submission, review, approval, contractual due date and expected bank receipt as separate dates.

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Include deposits, advances and approved changes

Enter mobilization deposits, customer advances and other contractual prepayments on the date they are expected to clear. Label them as advances or unearned amounts in the notes; cash received ahead of performance is not automatically revenue or profit.

Keep approved change orders in the contracted or approved column only when the change is authorized and its billing basis is clear. A pending request can be shown in a separate upside or downside scenario, but it should not be counted as committed cash. If a change creates an immediate subcontract or material commitment before approval, show that potential payment in the relevant scenario.

Forecast retainage release separately

Track the withheld amount separately from ordinary invoice collections. Forecast release only when the contract’s closeout, certification and other requirements support a date. Do not apply one percentage to every contract or jurisdiction.

For U.S. federal fixed-price construction, Federal Acquisition Regulation (FAR) 32.103 states that retainage withheld under the contract shall not exceed 10 percent of the approved estimated amount, and retained amounts are to be paid promptly when all contract requirements are complete. That is a rule within the federal regulation’s scope, not a general rule for private contracts or every state. Enter the percentage and release date required by each executed contract and applicable law.

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Build the job-outflow schedule

Project cost reports show what has been incurred against budget; a cash forecast must show when those costs are paid. Build an outflow schedule that combines actual invoices, open commitments and the remaining cost estimate.

Payroll and labor

Map employee payroll, payroll taxes, benefits, per diem and reimbursable labor to the actual pay dates. If time is approved after a pay-period end, place the cash on the payroll date rather than on the date hours were worked. Include project labor and any shared field staff only once.

Subcontractors

For each subcontract, record the expected application date, approval lag, payment terms, retainage and likely payment date. Include scheduled deposits, stored-material payments and final releases where the contract requires them. Reconcile the schedule to approved payment applications and accounts payable so that a commitment is not counted again when its invoice arrives.

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Materials and equipment

Use purchase orders, supplier terms and delivery schedules. A deposit or early-payment requirement may create cash outflow before installation or before the related customer billing is collected. Separate equipment purchases, rentals, fuel, maintenance and mobilization; their timing often differs even when they support the same job.

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Insurance and other job costs

Include project-specific insurance, permits, testing, temporary facilities, freight and professional services when they are material. Place annual or milestone charges on the dates they are expected to be paid, not evenly across months unless installments actually work that way.

Add company-level cash movements

After each project schedule is complete, add the cash that exists outside job cost ledgers. Typical lines include:

  • Office and management payroll, payroll taxes and benefits.
  • Rent, utilities, software, telecommunications and professional fees.
  • Income, sales, payroll and other taxes, with payment dates from filed returns or current estimates.
  • Insurance premiums and renewals.
  • Loan principal, interest, equipment finance and required reserves.
  • Owner distributions, capital contributions and intercompany transfers.
  • Vehicle or equipment purchases and other one-off capital spending.

Mark whether a line is recurring, contractual or discretionary. Avoid double counting: a project manager’s wages should be either in a job schedule or company overhead, according to your accounting policy, not in both. Shared cash should be assigned once at the company level.

Use a clear period calculation

Each period should have separate receipt and payment columns and a carried-forward balance. A simple spreadsheet layout is:

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Line Purpose
Opening available cash Reconciled cash that can be used at the start of the period.
Project receipts Collections by job, including deposits, approved progress billings and retainage releases when supported.
Company receipts Financing, owner funding or other non-project inflows.
Project payments Payroll, subcontractors, materials, equipment and other job disbursements.
Company payments Overhead, taxes, debt, insurance, distributions and capital spending.
Net cash movement Total receipts minus total payments.
Closing available cash Opening cash plus net movement; carry this to the next period.
Lowest projected balance Flag the minimum closing balance and its period for action.

The same calculation can be expressed as closing casht = opening casht + receiptst − paymentst, with opening casht+1 = closing casht. Add a reconciliation line that compares actual bank cash with the forecast closing figure at each update.

Worked hypothetical example: why timing matters

The following numbers are hypothetical and do not describe normal industry terms. Assume a U.S. private contract, a weekly forecast, an opening available bank balance of $120,000 and no restricted cash. The contract allows a $200,000 progress application after a milestone, with 5% contractual retainage and payment 30 days after approval. The owner is expected to approve the application 10 days after submission. The forecast assumes $190,000 will be collected after the $10,000 retainage, with release at closeout. Confirm all dates and deductions against the executed contract.

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Week Key event Receipts Payments Closing cash
1 Submit $200,000 application; no collection yet $0 $78,000 payroll, suppliers and subcontractors $42,000
2 Application under review; material deposit due $0 $55,000 job costs and $18,000 office overhead -$31,000
3 Approval expected; no contractual receipt yet $0 $20,000 payroll and supplier payments -$51,000
4 30-day payment period begins after approval $0 $16,000 project and overhead payments -$67,000
5 Expected collection of $190,000 net of retainage $190,000 $24,000 payments $99,000

This example exposes a funding gap before the expected collection even though the gross application is large. A manager could respond by confirming the approval date, negotiating supplier timing, arranging a documented short-term facility, accelerating an eligible billing or revisiting discretionary spending. The forecast does not guarantee that any action will succeed; it makes the timing problem visible early.

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Model construction-specific timing deliberately

Progress billing and approval risk

Do not place the full value of work completed into the collection column. Break it into the claim date, review period, approval, contractual due date and expected receipt. If a claim is likely to be disputed, show the undisputed amount in the base case and the balance in a downside or delayed-collection case.

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Retainage and closeout

Show gross billings, retainage withheld and net cash separately. Link release to punch-list completion, certificates, lien waivers and other actual contract conditions. A late closeout can shift a material receipt beyond the forecast horizon.

Change orders

Maintain separate rows for approved changes, pending requests and rejected or withdrawn items. Include a pending change in the base case only when authorization and a reliable collection path exist. Otherwise, use it as scenario information while still modeling any cost that has already become an obligation.

Cost-to-cash gaps

Compare cost incurred and remaining cost to the dates money leaves the bank. Large purchases, subcontractor deposits or payroll increases can precede the billing that funds them. A job-cost report can identify an overrun; the cash forecast shows the week in which the overrun must be financed.

Create base, downside and upside scenarios

Start with a base case using the most supportable dates. Then copy the schedule into scenarios that change assumptions rather than hiding uncertainty in a single percentage.

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  • Collection delay: move selected customer receipts by one or more periods where approval or payment history warrants it.
  • Schedule slippage: move both progress receipts and related costs when a milestone is likely to move.
  • Cost overrun: increase remaining labor, material or subcontract cost on the affected job and place it on the expected payment dates.
  • Retainage delay: move release beyond the planned closeout date if certification or punch-list completion is uncertain.
  • Change-order uncertainty: exclude pending revenue from the base case while testing the cost and potential receipt in a separate case.

Record the assumption, owner and date for each scenario change. Avoid presenting an arbitrary “buffer” as a probability or industry benchmark; the available guidance does not establish a universal construction cash reserve percentage.

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Update the forecast and explain variances

At every update, replace assumptions with actual bank, billing, payroll and accounts-payable information. Reconcile:

  1. Actual opening bank cash to the prior forecast closing cash.
  2. Collections received to the invoices and projects that generated them.
  3. Payments made to payroll, supplier, subcontractor and overhead rows.
  4. Remaining cost and progress to the latest project manager estimate.
  5. New commitments, approved changes, disputes and revised closeout dates.

Keep a short variance note for significant changes: for example, “owner approval moved from 10 to 17 June” or “steel deposit released two weeks earlier than purchase order.” Preserve the old forecast or a dated snapshot so management can see whether recurring optimism, late billing or cost growth is causing misses.

Controls that prevent common forecasting errors

  • Double counting: remove an estimated subcontract payment when the approved invoice is loaded into accounts payable, or link the rows so only one cash event remains.
  • Confusing earned revenue with cash: keep work performed, invoiced, approved and collected as separate statuses.
  • Using contract value as available cash: include only amounts with a defensible billing and collection date.
  • Applying one retainage rule: read the executed contract and applicable jurisdictional requirements for every job.
  • Ignoring taxes and debt: import payment dates from filed returns, loan schedules and insurance notices.
  • Hiding restricted cash: exclude funds that cannot legally or practically pay the forecast obligations.
  • Overlooking shared overhead: add company-level costs after project schedules are consolidated.
  • Failing to update commitments: require project managers to report purchase orders, subcontract awards and schedule changes before each cut-off.

Spreadsheet or construction-management software?

A spreadsheet can be sufficient for a small portfolio when one team maintains disciplined project rows, version control and regular bank reconciliation. Use protected formulas, a change log, data validation for statuses and a separate assumptions tab. Keep the detailed project schedules linked to a consolidated cash view rather than retyping totals.

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As the number of jobs, billing rules, bank accounts or users grows, software that connects job costing, progress billing, commitments and project tracking can reduce manual re-entry. It does not remove the need to verify contract terms, approval dates or collection assumptions. Compare options on these axes:

Decision axis Questions to ask
Project detail versus company totals Can users drill from the company balance to a job, invoice, commitment and payment date?
Billing status Are submitted, approved, disputed, collected and retainage amounts distinct?
Change orders Can approved and pending changes be separated in the base case and scenarios?
Cost timing Does the system show committed costs, payroll timing and supplier terms rather than only cost-to-date?
Scenario and variance updates Can assumptions be changed, dated and compared with actual cash?
Effort and integration What bank, payroll, accounts-payable and project-data connections are reliable enough to keep dates current?

Software is optional; a stale integrated system is less useful than a carefully maintained spreadsheet.

How to use the forecast in management decisions

Review the lowest projected available balance, its date and the assumptions that drive it. Then decide whether to accelerate a supportable billing, resolve an approval dispute, phase a purchase, adjust subcontractor payment timing within contract limits, defer discretionary spending, contribute capital or arrange financing. Document the decision and its effect in the next forecast.

Use the forecast alongside, not instead of, job-cost, work-in-progress, profit-and-loss and balance-sheet reporting. It cannot prove that a project is profitable, and it cannot guarantee liquidity. Before entering due dates, retainage percentages or release assumptions, review the executed contracts and applicable rules with the responsible project and finance personnel. Obtain accounting or legal advice when a contract, tax or financing issue is material.

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