How to Prepare BAS When Subcontracting as a Carpenter
Published on July 3, 2025
How to Prepare BAS When Subcontracting as a Carpenter starts with understanding your Business Activity Statement (BAS) obligations and the steps you need to lodge and pay on time. As a sole trader in ACT Australia, you must meet your GST obligations and report tax information—including Pay-As-You-Go installments and withholding tax—either monthly BAS, quarterly BAS or an annual BAS for an annual tax period. Getting this right protects your cash flow and keeps you compliant with Australian Taxation Office (ATO) regulations.
What Is a BAS and Why It Matters
A BAS, or Business Activity Statement, is a form you lodge with the ATO to report and pay Goods and Services Tax (GST), Pay-As-You-Go (PAYG) withholding and installments, fuel tax credits, wine equalisation tax and luxury car tax if they apply. Even if your business’s annual GST turnover is under the $75,000 threshold, voluntary registration lets you pay GST on sales and claim GST credits on purchases. Meeting your BAS due dates avoids penalties and helps you plan cash flow around tax obligations.
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Registering for GST and Other Tax Requirements
Before you lodge your first BAS, make sure you’re registered correctly:
ABN and GST registration – Apply for an Australian Business Number (ABN) and register for GST through the ATO.
Reporting cycle – Choose between monthly BAS, quarterly BAS or an annual BAS reporting cycle based on your turnover and cash flow needs.
Registered agents – You can lodge through your own tax agent or BAS agent, or appoint a registered tax agent to manage BAS lodgement and BAS payments on your behalf.
Choosing monthly or quarterly BAS affects your payment cycle and how often you lodge your BAS statement. Small carpentry businesses often prefer quarterly BAS to smooth out cash demands, but monthly BAS can help manage cash flow by keeping payments smaller.
Choosing Your GST Accounting Method
Your accounting method determines when you report GST on sales and purchases:
Cash accounting – You report GST when you actually receive payment from clients and when you pay suppliers. This method suits businesses that need to track real cash flow.
Accruals accounting – You report GST when you issue invoices and when you receive supplier bills, regardless of when money changes hands.
Your choice affects labels on the BAS: G1 for total sales, 1A for GST on sales, G10/G11 for purchases and 1B for GST credits. Accounting software can automate these labels, calculate fuel tax credits and bring together your financial records for easy BAS lodgement.
Completing Your BAS: A Step-by-Step Guide
Follow these instructions to complete your BAS accurately, meet ATO requirements, and avoid costly mistakes:
1. Gather Financial Records
Start by collecting tax invoices, receipts and payroll summaries for employee wages and withholding tax obligations. Keep records for at least five years to meet ATO regulations and to support any fuel tax credits or wine equalisation tax adjustments.
2. Calculate Sales and GST Collected
Enter your GST-inclusive sales at label G1. Then work out GST on sales at 1A by dividing your GST-inclusive total by 11. For example, $110,000 in GST-inclusive fees means $10,000 in GST collected.
3. Calculate Purchases and GST Credits
Record your business purchases—including materials, subcontractor fees and small tools—at G10/G11. Claim GST credits at 1B by dividing your total GST-inclusive costs by 11. Fuel tax credits for business use of fuel must be calculated using the rates published by the ATO.
4. Determine Net GST Outcome
Subtract GST credits (1B) from GST on sales (1A). If the result is positive, that amount is payable at the BAS due date. If negative, the ATO will refund the difference as a BAS refund.
5. Include PAYG Installments and PAYG Withholding
If you’re required to pay PAYG instalments for your own income tax, report them at the PAYG installment labels. For any employees or subcontractors where you’ve withheld tax, include those amounts at the withholding tax labels (W1–W3).
6. Lodge and Pay by the Due Date
BAS due dates depend on your reporting cycle:
Reporting Cycle | Period Covered | BAS Due Date |
|---|---|---|
Monthly BAS | 1st–End of Month | 21st of Next Month |
Quarterly BAS | Jul–Sep, Oct–Dec, Jan–Mar, Apr–Jun | 28th of Month After Quarter |
Annual BAS | 1 July–30 June | Same as Tax Return Due Date |
Set calendar reminders for BAS due dates or arrange a direct debit through the ATO to avoid missing a BAS payment. If cash flow is tight, talk to a registered BAS agent or tax professional about a payment plan to spread BAS payments over time.
Special Taxes and Credits for Carpenters
Even if most of your BAS relates to GST and PAYG, you may encounter other tax items:
Wine Equalisation Tax (WET) – Applies only if you sell or supply wine products.
Luxury Car Tax (LCT) – Applies on cars over the LCT threshold when you import or manufacture cars costing more than the threshold.
Fuel Tax Credits – Claimable on fuel used off-road in machinery, plant and equipment.
Fringe Benefits Tax (FBT) – If you provide benefits such as a work ute or phone plan to employees, you report FBT separately in your annual FBT return.
Accounting software and standard business reporting tools can help track these items across your BAS reporting cycles so you don’t miss anything.
Record Keeping and Reporting Best Practices
Good record keeping is at the heart of smooth BAS lodgement:
Digital records – Use cloud-based accounting software to store invoices, receipts and BAS reports securely and access them from any device.
Regular reconciliation – Match bank statements to your sales, purchases and BAS labels each month to avoid end-of-quarter surprises.
Document organisation – Keep separate folders (physical or digital) for tax invoices, PAYG withholding summaries and special tax records like LCT and WET adjustments.
Well-organised records make it easier to work with a registered tax or BAS agent, and ensure compliance if the ATO requests to review your financial records.
Actionable Tips to Streamline Your BAS Process
To save time and reduce stress around your business’s annual GST turnover and BAS obligations:
Automate Invoicing: Choose accounting software that automatically calculates GST, fuel tax credits and WET so your BAS labels update in real time.
Schedule Regular Check-Ins: Reconcile your accounts weekly or monthly and review your BAS figures at least two weeks before the due date.
Engage a Professional: Partner with a registered BAS agent or tax agent to lodge your BAS and annual tax return, freeing you to focus on carpentry work rather than admin.
Plan for Cash Flow: Set aside a percentage of each invoice for BAS payments, PAYG installments and other tax obligations so you’re not caught short at lodgement time.
Use Reminders: Flag BAS due dates, pay-as-you-go installments and annual reporting deadlines in your calendar. For July monthly BAS, set reminders early in the month to gather your records.
Conclusion
Preparing your BAS as a subcontracting carpenter doesn’t have to be challenging. By registering for GST, choosing the right reporting cycle, keeping accurate records and using accounting software, you can lodge your BAS on time every period—monthly BAS, quarterly BAS or annual BAS—and maintain healthy cash flow. When in doubt, engage a registered BAS or tax agent to guide you through your tax obligations and help you focus on delivering quality carpentry work rather than paperwork.
Lukasz Klekowski
