Flat out doesn’t always mean cashed up. Many builders and subcontractors run full schedules yet still feel short on cash. From our work in accounting for builders Melbourne, we see the same patterns again and again: good operators losing cash flow because of five avoidable traps. Here are the most common issues and simple fixes you can start this week.

1) Slow Customer Payments Choke Cash (A Common Accounting Issue for Builders in Melbourne)

Late payments plague the Australian construction sector. Recent data shows 92% of construction businesses had overdue invoices in the past year—cash stuck in someone else’s bank account, not funding your jobs.

Even when clients pay, retentions (usually 5% on contract value) stay withheld. In Queensland, trust rules make this even tighter, but Melbourne builders still feel the same pain: you earn the money, but you can’t use it.

Quick fixes

  • Add clear payment expectations on every invoice: due date, supporting docs, who signs off.

  • Track retentions in a simple register.

  • Use a “progress claim checklist” to avoid delays caused by missing details.

2) Over/Under-Billing and WIP Confusion Hide Cash Pressure

Many Melbourne builders show profit on paper while running out of cash because of incorrect Work-in-Progress (WIP) treatment. Over-billing shows a profit before work is complete; under-billing means you’re funding the job yourself. Under AASB 15, these timing gaps create nasty surprises.

Quick fixes

  • Review WIP weekly: % complete vs claims vs cash received.

  • Align billing to milestones clients actually approve.

  • Keep a single dashboard for negative WIP (over-billed) and positive WIP (under-billed).

3) Retention Rules and Contract Conditions Lock Up Cash

Even though trust account rules differ by state, the cash impact is similar for Melbourne builders: retentions are money you’ve earned but can’t spend. These withheld amounts often sit untouched for months.

Quick fixes

  • Don’t count retentions as available cash in your budget.

  • Maintain a retention ledger with release dates.

  • Review which contracts have strict retention terms and adjust your cash planning accordingly.

4) Cost Inflation + Long Payment Terms = Negative Cash Cycle

Across Australia, large clients often push 30–90-day payment terms. Pair that with rising labour, materials, and insurance costs, and builders easily slip into a negative cash cycle. Late payments cost Aussie SMEs $2,500+ per month in real losses.

Construction remains a top industry for insolvency nationwide—cash strain is a major reason.

Quick fixes

  • Negotiate deposits or shorter terms.

  • Negotiate longer supplier terms to match your collections.

  • Standardise reminders (3/7/14 days) and escalate overdue accounts quickly.

The Weekly Rhythm That Changes Everything

You don’t need a 30-page report. Every Friday, check three numbers:

  1. Bank balance today

  2. Bills due in the next 14 days

  3. Invoices due in the next 14 days (and what’s blocking approval)

This is your “mini-CFO” view. If the gap looks ugly, act immediately: send a claim, chase approval, or pause non-critical spending.

When to Get Help From Accounting for Builders Melbourne Experts

You might need support if you’re:

  • Busy but constantly cash-tight

  • Always chasing progress claim approvals

  • Unsure whether a job actually made money

  • Dreading compliance reporting

If that’s you, you don’t need more spreadsheets, you need clean claims, tight retention tracking, accurate WIP, and a weekly cash rhythm.

Need Help? We literally do this for our clients every day. Start with a free 20-minute Numbers Health Check — we’ll show you the 3 changes that can move cash within the next 30 days.

Book your free Number Health Check appointment