A standard bookkeeper can handle invoicing, bank reconciliation and payroll. A construction bookkeeper needs to do all of that and simultaneously track job-level profitability across a dozen active sites, manage subcontractor payment schedules, prepare TPAR, track retention deductions against progress claims and navigate one of Australia's most actively enforced contractor classification regimes. These are not the same skill set.
Why Construction Bookkeeping Is Different
Three structural features make construction bookkeeping fundamentally more demanding than a typical service business:
- Project-based revenue — income arrives as progress claims, not regular invoices. Each claim is tied to a specific milestone on a specific project, requiring job-level tracking rather than a single revenue account.
- Subcontractor-heavy cost structure — most construction businesses engage subcontractors for specialised trades, creating TPAR obligations, classification risk and complex payment terms including retention.
- Cash flow pattern — construction businesses are routinely profitable on paper but cash-poor in practice, because retention is withheld and progress payments arrive weeks or months after costs are incurred. Without job-level cash flow tracking, this mismatch is invisible until it's critical.
Job Costing — The Foundation of Construction Bookkeeping
Job costing tracks every cost — materials, labour, subcontractors, plant hire and allocated overheads — against individual job or project codes. At any point in a project, a correctly maintained job cost report shows:
- Original estimated cost vs actual cost to date
- Estimated cost to complete vs remaining budget
- Current gross margin vs estimated gross margin
- Unbilled costs and billed-but-uncollected progress claims
Without job costing, a construction business knows its overall P&L but cannot tell which jobs made money and which didn't — and cannot identify margin bleed until it has already destroyed the project's profitability. Xero Projects and MYOB JobManager both support job costing; the bookkeeping setup requires correctly structured tracking categories and consistent invoice coding from day one.
The profit illusion: One of the most common situations in construction — a business showing healthy overall profit while having several active jobs that are individually running at a loss. Job costing makes each job's profitability visible in real time, not retrospectively at EOFY when nothing can be done about it.
TPAR: Taxable Payments Annual Report
Australian businesses in building and construction that make payments to contractors for building and construction services must lodge a TPAR with the ATO by 28 August each year. This covers payments for contractor labour — including mixed labour-and-materials contracts where the labour component is material.
| What Must Be Reported | What's Excluded |
|---|---|
| Payments for building and construction services to contractors with an ABN | Payments to employees (these are handled through STP) |
| Contractor name, ABN and total payments made during the year | Payments for materials only (no labour component) |
| GST included in payments (separated from the payment total) | Contractors who provide invoices with no ABN if withholding has occurred |
The ATO cross-references TPAR data against contractors' income tax returns — making the accuracy of your subcontractor payment records essential, not optional. Subcontractors who don't report income that appears in your TPAR receive ATO income discrepancy notices; if your TPAR is incorrect, you create disputes and compliance complications for both parties.
Contractor vs Employee Classification — Construction's Highest Risk Area
Construction is one of the industries the ATO most actively audits for worker misclassification. The risk: a subcontractor who holds an ABN, operates a business name and invoices you for their work can still be classified as an employee by the ATO if the arrangement meets the employment criteria under the multi-factor test.
The Payday Super risk: From 1 July 2026, eligible contractors are subject to the same Payday Super timing rules as employees. A subcontractor who is actually an employee — by the ATO's classification, not yours — has generated both SG underpayment liability and Payday Super non-compliance simultaneously. The ATO's STP and clearing house data matching makes this increasingly detectable. See the SGC penalty guide for what this costs.
Classification review should be part of your bookkeeper's scope — not a one-time setup exercise. As working arrangements change, the classification can change. Any subcontractor who works substantially full-time for you, uses your equipment, and follows your direction on how to perform the work warrants fresh classification assessment.
Retention and Progress Claims
Construction contracts typically include a retention clause — commonly 5–10% withheld from each progress payment until practical completion, then released in stages (commonly half at practical completion, half at end of defects liability period). Bookkeeping needs to:
- Track retention withheld by your clients against each progress claim as a separate asset (amounts owed but not yet payable)
- Track retention deducted from your subcontractor payments as a separate liability (amounts owed to subcontractors but not yet paid)
- Flag approaching retention release dates so you can claim and release amounts on time
Construction businesses that don't track retention separately routinely overestimate their cash position (not accounting for retention owed to subcontractors) or leave retention unclaimed from clients because the release date passes unnoticed.
Construction Payroll and Award Pay
Employees in the building and construction industry are typically covered by the Building and Construction General On-site Award or the Joinery and Building Trades Award, each with specific allowances for working at heights, tool use, travel, distant work and inclement weather. These allowances significantly complicate payroll compared to a standard award and are frequently coded incorrectly by bookkeepers without construction experience.
For Brisbane-based construction businesses, see our Brisbane bookkeeping services page for construction-specific support. For Sydney construction and trades, see Sydney bookkeeping services.
Payday Super for Construction Workers
From 1 July 2026, construction employees are subject to the same Payday Super rules as any other employee — SG contributions must reach their fund within seven business days of payday. The complication in construction is FIFO-style arrangements for regional and remote work, where site allowances and travel payments need to be correctly classified as either SG-bearing ordinary time earnings or exempt allowances before the super base is calculated.
What Construction Bookkeeping Costs in Australia
Construction bookkeeping typically costs $1,200–$3,500 per month for small to mid-size builders and trades businesses — reflecting the additional complexity of job costing, subcontractor payment tracking, TPAR preparation and construction-specific payroll. Businesses with large subcontractor volumes, multi-project reporting requirements and retention tracking across many contracts sit toward the upper end of this range.
Bookkeeping Built for Construction's Complexity
OrtúsPro Global's bookkeeping team handles job costing, TPAR preparation, subcontractor payment management and construction award payroll — fixed monthly pricing, dedicated bookkeeper in 48 hours.
Frequently Asked Questions
What is TPAR and which construction businesses need to lodge it?
TPAR stands for Taxable Payments Annual Report. Australian businesses in building and construction that make payments to contractors for building and construction services must lodge a TPAR with the ATO by 28 August each year. The ATO uses TPAR data to cross-reference contractors' income tax returns — making correct contractor payment records essential.
How does job costing work in construction bookkeeping?
Job costing tracks every cost — materials, labour, subcontractors, plant hire and overheads — against individual job or project codes. This gives a real-time view of each job's profitability against the original estimate, allowing builders to identify margin bleed before it becomes a loss. Without job costing, construction businesses know overall profit but cannot tell which jobs made money and which didn't.
Are construction subcontractors employees or contractors for payroll tax and super purposes?
This is one of the most complex classification questions in construction. The ATO uses a multi-factor test to determine worker classification regardless of how the contract is structured. Subcontractors who work exclusively for one builder, use the builder's equipment and take direction on how to do the work may be classified as employees regardless of the ABN they hold.
How much does construction bookkeeping cost in Australia?
Construction bookkeeping typically costs $1,200–$3,500 per month for small to mid-size builders and trades businesses, reflecting the additional complexity of job costing, subcontractor payment tracking, TPAR preparation and construction-specific payroll.