A civil contractor wins a $1.8 million road reconstruction at a genuine eleven per cent margin. Eight months later the job is complete, the margin held, and the business is in serious trouble — an overdraft at its limit, a supplier on stop-credit and a tax debt on a payment plan.

Nothing went wrong on the job. What went wrong is that the wages, the fuel, the asphalt and the subcontractors were paid in weeks one to four, and the money for weeks one to four arrived in week nine. Multiply that by three concurrent jobs and a growing order book and the business runs out of cash while it is making money.

Construction cash flow is not an accounting topic. It is the operating constraint that decides how much work a civil SME can carry, and it is the reason profitable contractors fail. This guide covers how the cycle works, how to forecast it before you bid, and what actually moves the needle. Forecasting it during the job is a separate discipline, covered in our guide to job costing and cost control.

Profit is an opinion, cash is a fact

The distinction that costs contractors the most money is between profit and cash. They are different measurements of different things, and a job can be excellent on one and fatal on the other.

	Profit	Cash
What it measures	Revenue earned less costs incurred, over a period	Money in the account, on a date
When it is recognised	When the work is done	When the payment clears
What kills a business	Sustained losses, over years	A single month where the wages cannot be paid
What a growing order book does	Increases it	Consumes it

That last line is the one to sit with. In most industries, growth consumes cash gradually. In construction, growth consumes cash immediately and severely, because every new job requires you to fund four to ten weeks of costs before the first dollar arrives. A contractor doubling turnover is doubling the size of the hole they have to fund, and doing it before any of the additional margin is received.

Where the cash gap comes from

Six components, each of which adds days.

Component	What it costs you in days
The claim period	You claim monthly, so work done on day 1 waits until day 30 to be claimed. Average across the month: about 15 days
Assessment	The superintendent or principal assesses and issues a payment schedule or certificate: typically 10 business days
Payment period	From certification to payment: commonly 10 to 20 business days, sometimes longer on private work
Wages and fuel in advance	Paid weekly or fortnightly, during the claim period, before any of it is claimed
Mobilisation and establishment	Spent before the first claim, and sometimes not claimable as a separate item
Retention or security	A percentage of every payment withheld, or a guarantee facility consumed — see §06 and §07

Add them up on a typical council contract and the gap between spending a dollar and receiving it runs to somewhere between six and ten weeks. On private and Tier 1 subcontract work with longer payment terms, it can be considerably more.

The practical implication is a number every contractor should know: your business needs enough working capital to fund roughly two months of every job’s costs, simultaneously, for every job you are running. That number is the real ceiling on how much work you can carry, and it is the same constraint an assessor is testing when they examine your capacity — see demonstrating financial capacity in tenders and prequalification.

The claim cycle, day by day

Worked through on a contract with a reference date on the last day of the month, a 10-business-day assessment period and a 15-business-day payment period.

When	What happens	Cash effect
1–31 March	Work performed. Wages paid weekly, fuel and materials on account	Cash out, all month
31 March	Reference date. Claim prepared with measurement and supporting evidence	—
1 April	Payment claim served	—
~15 April	Payment schedule or progress certificate issued. Any amount scheduled lower than claimed must be explained	The number is now fixed
~7 May	Payment received, less retention	Cash in — five weeks after the average dollar was spent
20 April	Meanwhile, supplier accounts for March fall due on 30-day terms	Cash out, before the March claim is paid

Three things follow from reading the cycle this way.

• A missed claim date costs a full month. If the claim is served two days late and the contract sets a monthly reference date, that work waits until the next cycle. This is the most expensive administrative error available on a civil contract, and it is entirely avoidable with a notice calendar — see contract administration for civil SMEs.
• Supplier terms are usually shorter than client terms. Thirty-day supplier accounts against a five-week payment cycle means you fund the difference on every job, every month.
• The assessment step is where money is lost quietly. A claim that is assessed down is a cash event as well as a commercial one, and the time to prevent it is when the claim is prepared — see §11.

The statutory framework that sits over all of this — reference dates, payment claims, payment schedules, the consequences of failing to respond, and adjudication as a fast recovery mechanism — is covered in full in security of payment in Australia. This guide assumes it and deals with the money.

Payment terms across Australian clients

Not all clients pay at the same speed, and the differences are large enough to change which work you chase.

Client type	Typical behaviour
Commonwealth agencies	Supplier payment policies set short payment periods for contracts under a threshold, with faster terms again where electronic invoicing is used. Generally the fastest payers in the market[1]
State agencies	Most states have adopted faster payment policies for smaller contracts and for e-invoicing, with standard terms otherwise[1]
Local government	Varies widely by council. Usually reliable, sometimes slow, and heavily dependent on the certification step and the finance run cycle
Water and network authorities	Structured and predictable, generally on standard commercial terms
Tier 1 head contractors	Longer terms. Payment often follows their own claim cycle to the principal, which effectively adds a month to yours
Developers and private clients	The widest range, and the highest credit risk. Terms are negotiable, and worth negotiating

Two practical points. First, where a client offers faster payment for electronic invoicing, use it — it is free money in cash-flow terms and many contractors never set it up. Second, where you are subcontracting, ask directly how the head contractor’s payment cycle aligns with theirs; the answer determines whether you are funding four weeks or nine. That question belongs in the conversation described in subcontracting to Tier 1 civil contractors.

The cash curve of a civil job

Every civil contract has a characteristic cash shape, and knowing it before you bid tells you what the job will demand of the business.

Phase	What is happening	Cash position
Pre-start	Bid costs, bonds or guarantee fees, insurance, management plans, mobilisation	Negative, and entirely self-funded
Establishment	Site setup, compound, traffic management establishment, survey	Deepening — the largest single outflow before any income
Early works	Clearing, bulk earthworks, drainage. Heavy plant and labour, high burn	The trough — usually the deepest point of the job
Peak production	Steady claiming against steady cost	Recovering, roughly one payment cycle behind
Finishing	Costs fall faster than claims; final quantities and variations claimed	Best position of the job
Completion	Demobilisation, defects rectification, final claim	Slight outflow; final claim outstanding
Defects period	Retention or security held, minor rectification costs	Flat, with money outstanding for 6–12 months

The shape is important because the trough is what you have to fund. On a job with heavy early earthworks and a light finishing scope, the trough is deep and early. On a job that starts with a long design or approvals period, the trough is shallower but longer. A contractor running three jobs whose troughs coincide is running a business-level cash crisis that has nothing to do with any of the three jobs individually — and it is entirely predictable a month in advance if anyone is looking. Not every civil contract has this shape. A term maintenance contract claims monthly against work already done, which is why a maintenance base is the most effective ballast against project troughs.

The retention drag

Cash retention is money you have earned, that has been withheld, that you may have to ask for twice, and that a meaningful number of contractors never fully recover.

The mechanics are simple: a percentage — commonly five per cent — is deducted from each progress payment up to a cap; half is typically released at practical completion and the remainder at the end of the defects liability period. On a $2 million contract, that is $100,000 accumulated during the works, $50,000 released at completion, and $50,000 held for another six to twelve months.

Three consequences worth acting on.

• Retention accumulates across contracts. Five completed jobs with retention outstanding is a substantial sum sitting in other people’s bank accounts. Very few civil SMEs can say, without looking, what their total outstanding retention is. That number should be on a page.
• Release does not happen automatically. Both release points normally require a claim, and the second one — at the end of the defects period, months after everyone has moved on — is the one most often forgotten. The process for recovering it is set out in practical completion, defects liability and the final claim.
• A guarantee may be better than cash. Where the contract permits an approved unconditional undertaking instead of cash retention, the cash-flow difference is significant: you keep the full progress payment and pay a facility fee instead. Whether that trade is worth it depends on the fee and on whether the facility consumes borrowing capacity you need elsewhere — see §07.

Security, guarantees and facility capacity

Contract security and cash flow are the same conversation viewed from different ends.

A bank guarantee does not take cash out of your progress payments, but it does consume facility capacity — and the facility is usually secured against assets, cash, or a director’s property. The total value of guarantees you have outstanding across all live contracts is therefore a hard limit on how much work you can hold at once, and it binds well before your ability to do the work does.

Three things to do about it:

1. Know your used and available facility at all times. A contractor who wins a job and then discovers the guarantee cannot be issued has a mobilisation problem and a reputational one — see contract award, conditions precedent and mobilisation.
2. Return guarantees promptly. Guarantees on completed contracts frequently remain outstanding for months because nobody asked for them back. Each one is consuming capacity you are paying for.
3. Model retention against guarantee on every contract that offers the choice. On a long defects period, a guarantee usually wins. On a short job with a tight facility, cash retention may be the cheaper option.

Building a job cash flow forecast

A construction cash flow forecast at job level is a spreadsheet exercise of about an hour, and it is the single most useful commercial document a civil SME can produce.

1. Take the programme and spread the contract value across it by month, using the activities and their durations. This is your income line before adjustment — and it comes straight out of the construction programme.
2. Shift the income by the payment cycle. Work in March becomes cash in early May. This one step is what most contractors omit, and it is where the whole problem lives.
3. Deduct retention from each payment, and add the release amounts at their expected dates.
4. Spread the costs on their own timing, not on the income timing. Wages weekly. Plant and fuel weekly to monthly. Materials on supplier terms. Subcontractors on your subcontract terms.
5. Add the pre-start outflows — bid cost, guarantee fees, insurance, mobilisation, establishment.
6. Net it by week or fortnight, not by month. A monthly net position hides a mid-month trough that is the thing that actually bounces a payment.
7. Read the trough. The maximum negative cumulative position is the amount of cash this job requires you to have. Compare it to what you actually have.

Run this before you bid, not after you win. If the trough exceeds your available working capital and facility headroom, you have found something out that matters more than the margin — and the honest responses are to negotiate terms, reduce the exposure, or decline. That is a legitimate and under-used input to the go/no-go decision.

The business-level forecast

Job forecasts are necessary but not sufficient. The failure mode is at the business level, where several job troughs coincide with a quarterly tax obligation and an insurance renewal.

A workable business-level forecast is a rolling thirteen-week view containing:

• Every expected receipt, by job, on its expected payment date rather than its claim date.
• Payroll, including superannuation and any leave liability falling due.
• Tax obligations — activity statements, PAYG instalments, payroll tax where applicable.
• Supplier and subcontractor payments on their actual terms.
• Plant finance, equipment payments and insurance premiums.
• Facility position — overdraft used and available, guarantees outstanding.
• Retention outstanding and expected release dates.

Updated weekly, it takes twenty minutes and turns cash management from a reaction into a decision. Thirteen weeks is the right horizon because it is long enough to see a problem while there is still time to act — to bring a claim forward, chase a certification, delay a plant purchase, or have an early conversation with the bank rather than a late one.

Twelve levers that close the gap

In rough order of how much they move, and how quickly.

Lever	How it works
1. Never miss a claim date	The cheapest lever and the most commonly dropped. A missed monthly reference date costs a full cycle
2. Claim everything earned	Including variations, provisional sum adjustments and rate adjustments in the month they arise, not at the end
3. Make the claim easy to certify	Assessment delay is often just a query nobody chased. See §11
4. Negotiate a shorter cycle	Fortnightly claims halve the average delay. Frequently available on larger contracts if asked for before signing
5. Seek a mobilisation or advance payment	Not always available, but transformational when it is — it funds the trough directly
6. Claim materials on site	Where the contract permits it, unfixed materials delivered and secured can be claimed before installation
7. Front-load legitimately	Establishment and preliminaries priced as separate early items rather than smeared across the rates. Legitimate; unbalanced bidding is not — see pricing strategies
8. Use e-invoicing where the client pays faster for it	Free, one-off setup, permanent benefit
9. Match subcontractor terms to client terms	Paying subcontractors on 30 days while being paid on 45 means funding the difference on every dollar of subcontracted work
10. Substitute a guarantee for cash retention	Where the contract allows it and the facility exists
11. Chase retention releases actively	Diarise both release points at contract start, not at completion
12. Use adjudication when a payment is genuinely withheld	Fast and designed for exactly this. See security of payment

Levers 1 to 3 are administrative, free, and worth more than everything below them combined. Levers 4 to 6 are negotiated at contract formation, which is why the award stage matters commercially — once the contract is signed the cycle is fixed for the life of the job.

Making the claim harder to reject

A claim that is assessed down or held up is a cash event. Most of the delay is not resistance — it is a certifier who cannot verify what has been claimed with the information provided.

• Measure against the schedule. Claim in the same items, order and units as the schedule of rates or bill of quantities, so the certifier can check line by line — see bills of quantities, provisional sums and PC sums.
• Attach the measurement. Survey, quantities, chainages, joint measurement records where they exist.
• Separate variations clearly, each with its instruction reference and approval status. A variation buried in a rate item invites the whole claim to be queried — see variations.
• Include the photographic record for work that will be covered up.
• Attach conformance evidence where payment depends on it — test results, ITP sign-offs, hold point releases. See quality management plans and ITPs.
• Provide any statutory declarations or subcontractor statements the contract requires with the claim, not after it is queried. This is a common cause of a claim sitting unassessed.
• Serve it correctly. To the right person, at the right address, by the method the contract requires. Service defects are avoidable and expensive.

One habit worth adopting: call the certifier the day after the claim is served and ask whether they have everything they need. It is a two-minute call that regularly saves a week, and it costs nothing but the willingness to make it.

Paying down the chain

When you engage subcontractors, you become the party at the top of somebody else’s cash-flow problem — and the obligations that come with it are not optional.

• “Pay when paid” does not work. Provisions making your payment to a subcontractor conditional on you being paid are void under security of payment legislation across Australian jurisdictions. Your obligation to your subcontractor stands independently of whether the principal has paid you.
• Align the terms instead. The legitimate way to manage the exposure is to set subcontract claim dates and payment terms that sit sensibly inside your own cycle — agreed up front, in the subcontract.
• Statutory declarations and subcontractor statements are commonly required with your own claim, which means your subcontractor administration directly gates your own payment.
• Trust account regimes apply in some jurisdictions and at some contract values, with specific obligations for retention and progress payments. Where they apply they are compliance obligations, not options — covered in security of payment in Australia.

There is also a commercial argument. In a tight subcontractor market, a head contractor known to pay reliably gets better prices and better crews. Payment reputation is a procurement advantage, and it costs nothing except discipline.

Growing broke

The specific failure this guide exists to prevent. It has a recognisable sequence:

1. A good year. Margins hold, and the business decides to grow.
2. Bigger jobs are won, or more of them, or both.
3. Each new job requires six to ten weeks of costs to be funded before its first payment.
4. The troughs overlap. The overdraft absorbs the first one comfortably and the second one uncomfortably.
5. Supplier payments slip. Terms tighten. Some suppliers move to cash on delivery, which pulls cash forward and makes it worse.
6. Tax obligations are deferred, because they are the only creditor who will not stop the job tomorrow.
7. A payment is delayed on one contract — a disputed variation, a certification query — and the business cannot absorb it.
8. Wages, plant finance and the tax debt all land in the same fortnight.

Every step is visible in advance on a thirteen-week forecast. Growth is not the problem — unfunded growth is. The practical rule: before taking on additional concurrent work, calculate the combined trough and confirm the business can fund it. If it cannot, the options are to stage the work, arrange facility headroom before it is needed, or decline. All three are better than discovering it in step seven. Cash is the third thing that breaks as a civil business grows — after estimating capacity and supervision — and the order matters, as our guide to scaling a civil contracting business sets out.

Cash flow as a bid decision

Six questions worth answering before pricing, because each one changes what the job costs the business to carry:

• What is the claim frequency and the payment period? Monthly at 30 days is a different job from monthly at 45.
• Is retention cash, or can a guarantee be substituted?
• Is there a mobilisation payment, or any advance?
• Are materials on site claimable?
• How front- or back-loaded is the cost profile? Heavy early earthworks means a deep early trough.
• Who is the client, and how do they actually pay? Not their stated terms — their behaviour.

Where the answers are unfavourable and the contract is otherwise attractive, several of them are negotiable at award. The time to raise them is before signing, when you are the preferred tenderer and the client has invested months in the process — the leverage discussed in contract award, conditions precedent and mobilisation.

Nine warning signs

• You do not know what your total outstanding retention is.
• You could not say today which week over the next quarter is your tightest.
• Claims are prepared in the week after the reference date rather than before it.
• Supplier payments are being timed against expected receipts rather than terms.
• A tax liability is being carried deliberately as working capital.
• The overdraft has not returned to zero at any point in twelve months.
• Guarantees remain outstanding on contracts completed more than a year ago.
• Variations are being claimed at the end of the job rather than monthly.
• Growth decisions are being made on the order book rather than on the cash forecast.

None of these is fatal on its own. Three or more together describe a business that is one delayed payment away from a serious problem — and the fix in every case starts with the thirteen-week forecast in §09. Read them in both directions: the same behaviours in a client are the early warning covered in our guide to insolvency up the contractual chain.

Checklist

• Do you produce a cash flow forecast for each job before bidding it?
• Is the income line shifted by the actual payment cycle rather than the claim date?
• Do you know the trough — the maximum cash requirement — of each live job?
• Is there a rolling thirteen-week business-level forecast, updated weekly?
• Are claim dates in a calendar with reminders, for every contract?
• Are variations claimed monthly rather than accumulated?
• Does each claim carry measurement, evidence and any required declarations at the time it is served?
• Do you know your total outstanding retention, and both release dates for every contract?
• Do you know your used and available guarantee facility?
• Have completed contracts’ guarantees been returned?
• Are subcontractor payment terms aligned to your client terms?
• Is e-invoicing set up where the client pays faster for it?
• Before taking on additional concurrent work, is the combined trough calculated?

The short version

• The gap between spending a dollar and receiving it is typically six to ten weeks. Every job requires you to fund that gap.
• Growth consumes cash immediately in construction. The order book is not the constraint; the trough is.
• Forecast each job before bidding, shifted by the real payment cycle, netted weekly. The maximum negative position is what the job demands of the business.
• Run a rolling thirteen-week forecast at business level. Twenty minutes a week turns cash from a reaction into a decision.
• Never miss a claim date. It is the cheapest lever available and the most commonly dropped.
• Make claims easy to certify — measurement, evidence and declarations attached, served correctly.
• Retention is money you earned. Diarise both release points at contract start, and know the total outstanding across all jobs.
• “Pay when paid” is void. Align subcontract terms up front instead.

Sources and further reading

This guide is general information for Australian civil construction businesses and is not financial, accounting, tax or legal advice. Payment terms, retention and security provisions, claim and certification periods, statutory declaration requirements and trust account obligations are set by the particular contract and by the security of payment legislation of the relevant state or territory, and they differ between jurisdictions. Timeframes and percentages described as typical are indicative only. Obtain advice from your accountant and, where a payment dispute arises, from a lawyer experienced in construction payment matters.

• Australian Government and state government supplier payment policies — including the Commonwealth’s supplier pay on-time or pay interest arrangements for contracts under a stated threshold, with shorter payment periods again where electronic invoicing is used, and the equivalent faster payment terms policies adopted by state governments for smaller contracts and e-invoiced suppliers. Thresholds, payment periods and eligibility differ between jurisdictions and are revised from time to time — confirm the policy applying to your contract and client before relying on a particular period. Referenced in §04.
• Security of payment legislation across the Australian states and territories, for the statutory payment claim and payment schedule regime, reference dates, the consequences of failing to provide a payment schedule, the voiding of pay-when-paid and pay-if-paid provisions, adjudication as a rapid recovery mechanism, and the retention and project trust account regimes operating in particular jurisdictions and at particular contract values. Sourced in full in our guide to security of payment in Australia.
• Australian Standard general conditions of contract for construct-only civil work (AS 2124-1992 and AS 4000-1997), for the retention and security provisions referenced in §06 and §07 — the percentage deducted from progress payments, the maximum, the reduction at practical completion, the release at the end of the defects liability period, and the substitution of an approved unconditional undertaking for cash retention where the contract permits it. Sourced in full in our guides to AS 4000 vs AS 2124 and practical completion, defects liability and the final claim.