Bookkeeping Tips For Construction Businesses
Good bookkeeping for tradies comes down to four habits: track every job separately, keep every receipt (digital is fine), report GST and PAYG on time through your BAS, and lodge a Taxable Payments Annual Report if you pay subcontractors. Do those four consistently and tax time stops being a scramble.
Running a construction business is not the same as running most other small businesses. You are juggling different job sites, subcontractors on top of employees, materials that move through your books in different ways, vehicles that are part personal and part work, and progress payments that land months after the invoice goes out. This guide covers how to keep on top of it, what the ATO actually requires, and where tradies most often lose money.
Why bookkeeping for tradies is different
Construction is project-driven. Every job is a small profit-and-loss statement of its own, run across multiple sites, with a different mix of labour, materials, and equipment. General bookkeeping treats a business as one bucket. Construction bookkeeping treats each job as its own bucket, so you can tell which ones actually made money and which ones only felt busy.
What makes construction accounting different
- Jobs are the unit of measurement. Every quote, invoice, receipt, and timesheet needs to be attached to a job so you can work out the real margin. A profitable business with two loss-making jobs is not the same as a profitable business with no loss-making jobs, but only good job-level records show you the difference.
- Contracts run long and payments run slow. Progress claims, retentions, and end-of-job payments create timing gaps between doing the work and getting paid. Your books need to reflect what has been earned, not just what has been banked.
- Costs need to be tracked to each project. Materials, subcontractor invoices, plant hire, and labour hours all need to be coded to a job. Miss this and the tax return still gets lodged, but you cannot price the next quote properly.
- Scope changes are the norm. Site conditions, design tweaks, and client requests move the budget constantly. Variations need to be documented, priced, agreed, and captured in the books, or they end up as unpaid work.
GST, BAS and tax obligations for tradies
If your business turns over $75,000 or more, you must be registered for GST. Once registered, you charge GST on your invoices, claim GST credits on your business purchases, and report both through your Business Activity Statement (BAS). Most tradies lodge quarterly.
GST registration and invoicing
You need to register within 21 days of hitting the $75,000 turnover threshold, and once registered you charge 10% GST on all taxable sales. Tax invoices for amounts over $82.50 (including GST) must show your business name, ABN, invoice date, a description of what was supplied, the GST amount, and the total including GST. If a customer asks for a tax invoice, you have 28 days to provide one.
For anything under $1,000, that is all that is needed. Over $1,000, the customer’s identity or ABN must also be on the invoice.
BAS lodgement: what to include and when
Your BAS reports GST collected, GST paid, PAYG withholding for any employees, and PAYG instalments toward your own income tax. Quarterly BAS due dates for most small businesses are 28 October, 28 February, 28 April, and 28 July, but lodging through a registered BAS agent gives you extra time on most quarters. Get the numbers wrong and the ATO fixes it with penalties and interest, so accuracy matters more than speed.
If you want to check your numbers before lodging, our BAS calculator gives you a quick sanity check on GST and PAYG withholding, and the PAYG calculator works out withholding for individual employees.
TPAR: the one most tradies forget
If your business earns 50% or more of its income from providing building and construction services and you pay contractors to do any of that work for you, you must lodge a Taxable Payments Annual Report (TPAR) with the ATO by 28 August each year. The report lists every contractor you paid, their ABN, and the total you paid them across the financial year.
The ATO cross-checks these against contractor tax returns. Miss the lodgement and it triggers penalties. Miss a contractor and it can trigger a review. Most quality accounting software generates TPAR-ready reports automatically, provided contractor details and payment coding are correct throughout the year.
Tax deductions tradies commonly claim (or miss)
The single biggest reason tradies overpay tax is missed deductions. Not because the rules are hidden, but because the receipts never made it into the books. Common categories worth checking each year:
- Tools and equipment. Anything under $20,000 per asset can be immediately deducted under the small business instant asset write-off for the 2025-26 year, with the same threshold set to continue from 1 July 2026. Larger items go into a depreciation pool.
- Vehicle running costs. For a work ute or van, you can claim fuel, rego, insurance, servicing, tyres, and depreciation for the business-use portion. Two methods are allowed: cents per kilometre (up to 5,000 business km at the ATO’s set rate) or the logbook method (proportional to business use, based on a 12-week logbook). One-tonne utes are eligible for the instant asset write-off; standard passenger cars are capped by the ATO car limit.
- Fuel tax credits. Diesel used off-road (in generators, on-site plant, in machinery on a job site) is eligible for fuel tax credits. Small credits add up over a year.
- Home office running costs. If you run the admin side of the business from home, you can claim a portion of electricity, internet, and phone. Keep a record of hours worked from home.
- Protective clothing, boots, sunscreen, sunglasses. Compulsory PPE and sun protection used on-site are all deductible.
- Training and licence renewals. Costs to maintain trade licences, tickets, and certifications directly related to your current work are deductible.
- Union fees, industry association memberships, and subscriptions. Master Builders, HIA, MEA, and industry publications are all claimable.
- Software and admin costs. Accounting software, job management apps, quoting tools, phone and internet used for business.
Every claim needs a record. The ATO position is straightforward: if you cannot substantiate it, you cannot claim it. Photographing receipts into your accounting app the day you get them takes seconds and saves the July scramble.
Practical bookkeeping tips
The compliance side is what you must do. These are what will save you time and money.
Ask for help early
If you are already behind, get help before it compounds. A backlog of a quarter is a Saturday afternoon for a bookkeeper. A backlog of a year is a project. Registered BAS agents can lodge on your behalf, correct errors on prior returns, and set the books up so it stays on top of itself.
If the budget for a full outsourced bookkeeper is not there yet, most tradies start with a setup session and quarterly reviews. That gets Xero, MYOB or QuickBooks configured correctly for construction (jobs, subcontractors, TPAR coding), then leaves you to run the day-to-day.
Keep in the loop with every job
Job-level tracking is where most tradies find money. Every quote, timesheet, subcontractor invoice, and materials receipt needs to be coded to a job in the software. Do that and at any point you can look at a job and see whether it is running to budget.
A project management app or a simple site management tool that syncs to your accounting software makes this much easier than trying to reconcile paper dockets at the end of a job. Communication between whoever is on site and whoever runs the office matters just as much as the tech.
Keep a digital trail
Go paperless where you can. Photograph receipts into your accounting app as soon as you get them. The ATO requires you to keep business records for five years, and a phone photo counts as a record provided it is clear and complete.
Cloud storage (Google Drive, OneDrive, Dropbox) as a backup means nothing gets lost if a phone dies or a laptop walks off a site. If the ATO ever reviews you, having every receipt, invoice, and BAS working paper in a searchable folder turns a stressful process into an administrative one.
Use accounting software built for tradies
Xero, MYOB, and QuickBooks Online are all fine choices, but the value comes from setting them up properly for construction work: subcontractor supplier records with ABN captured, TPAR flags on the right contacts, job or project tracking turned on, and bank feeds connected so transactions come in automatically.
Job management apps such as ServiceM8, Tradify, simPRO and AroFlo bolt onto the accounting software and handle quoting, scheduling, timesheets, and invoicing from a phone on site. For smaller trades, the software plus one app is often enough. For larger builders running multiple crews, dedicated construction software may make more sense. Shoebox provides training and setup support for all three main platforms.
Don’t dig yourself into a hole
Bookkeeping for tradies is not complicated, but it is unforgiving if it slips. Miss a BAS, miss a TPAR, or lose a quarter of receipts and you spend more time and money fixing it than you would have spent keeping on top of it in the first place.
Shoebox Books & Tax specialises in bookkeeping and tax for tradies and construction businesses. Our BAS agents handle GST, PAYG, single touch payroll, and TPAR, and our tax accountants find the deductions most tradies miss. Fixed-price packages mean no surprise invoices, and we come to the site or the office instead of asking you to come to us.
Have a look at our tradies accountant service, browse our bookkeeping pricing, or find your local expert. Prefer to talk it through? Book a free consultation or call 1300 65 35 83.
Frequently Asked Questions
Do I need to register for GST as a tradie?
You must register for GST if your business turnover is $75,000 or more in a financial year, or if you expect to hit that threshold within 12 months. Below $75,000 it is optional. Once registered, you charge 10% GST on all taxable sales, claim GST credits on business purchases, and report both quarterly on your BAS. Most established tradies are registered.
When do I need to lodge a TPAR?
If your business earns 50% or more of its income from building and construction services and you pay contractors to provide any of that work, you must lodge a Taxable Payments Annual Report with the ATO by 28 August each year. The report covers payments made across the previous financial year, listing each contractor’s name, ABN, and the total paid. The ATO uses it to cross-check contractor tax returns.
What is the best accounting software for tradies?
Xero, MYOB and QuickBooks Online are the three most used platforms among Australian tradies, and all three handle GST, BAS, single touch payroll, and TPAR. The best choice depends on the size of your team, whether you need job costing, and which platform your bookkeeper works with. Adding a trade-specific app such as ServiceM8, Tradify, simPRO or AroFlo handles quoting and scheduling from site.
How long do I need to keep bookkeeping records?
The ATO requires most business records to be kept for five years from the date they were created, the date the transactions were completed, or the date you lodged the relevant tax return, whichever is later. Digital copies of paper records are acceptable provided they are clear and complete. For construction businesses with long-running contracts or capital assets, some records may need to be kept longer.
Can a bookkeeper handle both my BAS and my TPAR?
Yes, provided they are a registered BAS agent. Only registered BAS agents can lodge BAS and TPAR on your behalf under Australian law. Registered agents also get access to extended BAS lodgement deadlines through the ATO’s agent program. Shoebox Books & Tax has registered BAS agents across our network of local franchisees, and we specialise in tradie and construction businesses.
