In standard retail or service businesses, income and expenses are relatively predictable. A customer pays for a product, and the business pays its suppliers on regular 30-day terms.
Construction is different. Money moves in large, irregular swings. You might receive a substantial progress payment on a Tuesday, only to watch most of it clear out by Friday to cover bulk materials, equipment hire, and subcontractor invoices. Because of this volatility, a building firm can easily appear profitable on a standard tax return while quietly running out of working capital in the bank.
Surviving and growing in this industry requires tracking the specific financial mechanics of the trade. If you rely solely on a standard profit and loss statement, you are flying blind.
Job Costing: Knowing Which Projects Earn a Profit
Relying solely on an overall Profit and Loss statement can be misleading. A company might show a healthy 15% overall profit margin, but that single figure could easily conceal two high-performing jobs subsidising three others that are running at a loss. Job costing involves allocating every single expense directly to the specific project that incurred it. To maintain clean job ledgers, track:
- Direct Materials: Timber, concrete, steel, and trade supplies coded directly to a job code rather than a general materials account.
- Subcontractor Costs: Invoices for specialised trades (plumbing, electrical, earthworks) assigned to the specific build phase.
- Direct Labour: Wages and site manager hours allocated by project timesheets.
- Equipment and Plant Hire: Specific machinery rentals and site-allocated wear and tear.
- Indirect Project Overheads: Site-specific insurance, council permits, and temporary utility connections divided across active jobs.
Proper bookkeeping for construction companies ensures these inputs are reconciled in real time, allowing you to catch budget overruns early rather than discovering them months after a project completes.
How Should You Track Progress Claims and Retentions?
Construction revenue is collected over time based on project milestones rather than upfront sales. Managing this requires strict tracking of two distinct items:
Progress Claims
- Track claim submission dates against approved certified values.
- Monitor unpaid claims immediately to prevent cash flow bottlenecks on active sites.
Retention Money
- In commercial and residential builds, clients often withhold a percentage of each payment (typically 5%) as security for defects.
- Do not record retentions as discounts or write-offs; they are an asset owed to your business.
- Track the exact retention amount held per job alongside the defect liability period expiry date (often 12 months post-practical completion) so you can invoice for its full release on time.
What Does The ATO Expect for Subcontractor Payments?
Because the Australian Taxation Office (ATO) closely monitors contractor payments in the building sector, onboarding and paying subcontractors carries strict compliance duties. To avoid penalties and streamline year-end reporting, your system must track:
- Verified ABN Details: Validate every subcontractor’s ABN prior to issuing payment. If an ABN is invalid or missing, you are legally obligated to withhold 47% of their invoice value and submit it to the ATO.
- GST Separation: Maintain an accurate breakdown of the GST paid on every contractor invoice.
- TPAR Data Capture: Every August, businesses in the construction industry must lodge a Taxable Payments Annual Report (TPAR).
Capturing contractor ABNs, total gross payments, and GST at the invoice stage through structured bookkeeping services eliminates the stress of searching for missing data when the annual TPAR deadline arrives.
Managing Wages Under Payday Super Rules
Payroll in construction extends far beyond standard hourly wages. Systems must account for variable site allowances, travel pay, height money, and inclement weather pay dictated by specific modern awards or Enterprise Bargaining Agreements (EBAs).
Furthermore, the compliance landscape shifted in July 2026 with the introduction of Payday Super. Employers can no longer hold onto superannuation liabilities and pay them at the end of the quarter. Super must now be paid alongside wages, generally reaching the employee’s fund within seven business days of payday.
Because of these shifting regulations and complex award structures, many growing builders use payroll outsourcing to ensure the 12% Superannuation Guarantee is calculated on the correct baseline (Qualifying Earnings) and paid strictly within the new statutory windows.
The Danger of Crossing The Financial Year
Construction projects frequently span across the 30 June financial year-end. This creates a significant timing problem for your taxes.
If you have billed a client for a milestone in June, but you haven’t yet paid the suppliers for the materials related to that milestone, your profit for that year will look artificially high. Conversely, if you have paid for $50,000 worth of materials sitting on site but haven’t invoiced the client yet, your profit looks artificially low.
Tracking Work in Progress (WIP) allows you to adjust your accounts at year-end so you only pay tax on the profit you have genuinely earned. It aligns the income with the actual expenses incurred to generate it. Without accurate job costing and WIP data, you risk either overstating your liabilities or overpaying on tax simply due to the timing of your invoices.
Building Financial Certainty
The financial environment for Australian builders is unforgiving. A single mismanaged contract can undermine the profit of multiple successful builds, while poor visibility over retentions and super obligations creates unnecessary cash pressure. By organising your accounts around project-level job costing, structured retention tracking, automated TPAR compliance, and accurate WIP adjustments, you gain total clarity over your financial position, giving you the certainty needed to quote competitively and grow sustainably.
Befree can help construction businesses bring job costing, WIP, retention tracking and contractor reporting into a structured accounting process. Speak to our team today to discuss how we can improve financial visibility across your projects and help you stay on top of your accounting obligations.