BAS Compliance Guide for Arborists: Lodgement, Deadlines and Common Mistakes (2026)

Every arborist who turns over more than $75,000 a year has to lodge a Business Activity Statement. That is not optional. Yet BAS compliance remains one of the biggest headaches in the tree care industry, and the ATO knows it. Arborist businesses have complex cost structures: mixed-use vehicles, fuel-hungry equipment, seasonal labour, subcontractors paid in cash, and jobs that span multiple reporting periods. Get your BAS wrong and you face penalties, interest charges, and audit attention you do not want.

This guide covers everything an arborist business owner needs to know about BAS lodgement, from deadlines and reporting labels to the specific mistakes we see tree care operators make every quarter. It is written from direct experience preparing BAS returns for arborist clients across Australia.

What Is a BAS and Why Arborists Get It Wrong

A Business Activity Statement (BAS) is the form you lodge with the Australian Taxation Office to report and pay several tax obligations in one go. Depending on your business, a BAS covers:

• Goods and Services Tax (GST) collected and paid
• Pay As You Go (PAYG) withholding from employee wages
• PAYG instalments toward your annual income tax
• Fuel tax credits
• Fringe benefits tax instalments (if applicable)

Arborists get BAS wrong more often than most trades because the industry has a unique combination of complicating factors. You run heavy diesel equipment that qualifies for fuel tax credits. You hire a mix of employees and subcontractors, sometimes on the same job. You buy capital equipment worth hundreds of thousands of dollars. You do cash work for residential customers. And your income swings wildly between wet and dry seasons.

All of this creates room for error. The ATO’s data-matching programs are specifically designed to catch discrepancies in industries like tree services, where cash transactions are common and fuel claims are significant. Getting your BAS right is not just about avoiding fines. It protects your business from a full ATO audit.

BAS Lodgement Deadlines: Quarterly vs Monthly

Most arborist businesses lodge BAS quarterly. You must lodge monthly only if your annual GST turnover exceeds $20 million, though you can voluntarily elect to lodge monthly if you prefer tighter cash flow management.

Quarterly BAS Due Dates (2025-26 Financial Year)

If you lodge your own BAS (not through a registered agent), these are your deadlines:

Quarter	Period	Due Date
Q1	1 July – 30 September 2025	28 October 2025
Q2	1 October – 31 December 2025	28 February 2026
Q3	1 January – 31 March 2026	28 April 2026
Q4	1 April – 30 June 2026	28 July 2026

If you lodge through a registered BAS agent or tax agent, you typically get an extra four weeks on most quarters. That extension alone is worth the cost of professional help.

Monthly BAS Due Dates

Monthly BAS is due on the 21st of the following month. There is no automatic extension for agent lodgement on monthly returns. For most arborist operations turning over $500,000 to $5 million, quarterly lodgement makes more sense. You get longer to prepare, and your accountant has time to reconcile properly.

Which Should Arborists Choose?

Quarterly suits the majority of tree care businesses. However, consider monthly lodgement if:

• You regularly claim large fuel tax credits and want faster refunds
• Your business consistently receives GST refunds (e.g., you bought a $300,000 crane truck this quarter)
• You want to smooth out cash flow rather than face a large quarterly bill

If you are unsure which reporting cycle suits your arborist operation, book a free consultation and we will assess your specific situation.

GST on Arborist Services: What Is Taxable and What Is GST-Free

If you are registered for GST (mandatory above $75,000 turnover), you must charge 10% GST on most arborist services. This includes tree removal, pruning, stump grinding, land clearing, mulching, arborist reports, and consulting. For a full breakdown, see our GST guide for arborist businesses.

Taxable Arborist Services (GST Applies)

• Tree removal and disposal
• Pruning, shaping, and crown reduction
• Stump grinding and root removal
• Land clearing and site preparation
• Mulch sales and delivery
• Emergency storm damage callouts
• Arborist assessment reports
• Consulting and project management
• Crane hire with operator (if part of your business)

Potentially GST-Free Supplies

Very few arborist services are GST-free, but there are edge cases:

• Export services: Work performed for an overseas client who is not in Australia when the service is performed may be GST-free under the export rules.
• Sale of a going concern: If you sell your entire arborist business as a going concern to a GST-registered buyer, the sale can be GST-free.
• Farmland clearing under certain conditions: Some vegetation management on agricultural land may have different GST treatment. Get specific advice on this.

When in doubt, charge GST. It is far easier to issue a credit note than to owe the ATO money you never collected.

BAS Reporting Labels That Trip Up Arborists

The BAS form uses alphanumeric labels. Here are the ones that matter most for tree care businesses, and where arborists commonly put the wrong numbers.

GST Section

Label	Description	Arborist Notes
G1	Total sales (including GST)	All invoiced tree work, mulch sales, consulting fees. Include GST-free and input-taxed sales here too.
G2	Export sales	Rare for arborists. Only if you did consulting for an overseas client.
G3	Other GST-free sales	Sale of a going concern, or any GST-free supply. Most arborists leave this at zero.
G10	Capital purchases (including GST)	This is where arborists make mistakes. A new chipper, crane truck, or elevated work platform goes here. Not your fuel, not your rope.
G11	Non-capital purchases (including GST)	Everything else: fuel, chainsaw chains, PPE, subcontractor payments, insurance, rent, phone, accountant fees.
1A	GST on sales	Auto-calculated if using accounting software. Should be 1/11th of your GST-inclusive taxable sales.
1B	GST on purchases	GST credits you are claiming back on your business purchases.

The G10 vs G11 Distinction

This trips up arborists constantly. A capital purchase is an asset costing more than $300 that you use over multiple years. For arborists, common G10 items include:

• Wood chippers ($30,000 – $250,000+)
• Crane trucks and EWPs ($150,000 – $500,000+)
• Stump grinders ($5,000 – $80,000)
• Chainsaws over $300
• Ute or truck purchases
• Trailers

Non-capital G11 items include fuel, consumables (chains, ropes, rigging gear under $300), subcontractor invoices, insurance premiums, and office expenses. Getting the split right matters because the ATO cross-references your capital purchase claims against depreciation schedules and asset registers.

PAYG Withholding Labels

Label	Description	Arborist Notes
W1	Total salary, wages and other payments	Gross wages for all your climbers, groundies, admin staff. Include overtime, allowances, and director fees.
W2	Amount withheld from payments at W1	The PAYG tax you held back from employee wages. Must match your payroll records exactly.
W3	Other amounts withheld	Tax withheld from subcontractors who have not given you an ABN, or voluntary withholding agreements.
W4	Total amounts withheld	Sum of W2 + W3. This is what you owe the ATO for the period.

Fuel Tax Credit Label

Label 7C is where you claim your fuel tax credits. For arborists, this is often a significant amount. Diesel used in chippers, stump grinders, and other off-road equipment attracts the higher credit rate (check the current ATO rates for off-road use, as these change every six months). Diesel in your on-road trucks attracts a lower rate (a lower rate for on-road heavy vehicles (check ato.gov.au for current rates)). See our detailed fuel tax credits guide for arborists.

Common BAS Mistakes in Tree Care Businesses

After years of preparing BAS returns for arborist clients, these are the mistakes we see repeatedly. Each one can trigger ATO scrutiny or cost you money.

1. Claiming GST Credits on Non-Business Purchases

Your ute does the school run and tows the chipper. Your phone is used for personal calls and client bookings. If an item has mixed business and personal use, you can only claim the business portion of the GST credit.

The ATO expects you to use a reasonable method for apportioning mixed-use items. For vehicles, a logbook kept for at least 12 continuous weeks sets your business-use percentage for five years. Without a logbook, you have no defensible position in an audit. A common figure for arborist utes used primarily for work is 75-90% business use, but you need the logbook to prove it.

2. Incorrect Fuel Tax Credit Claims

Fuel tax credits are a major entitlement for arborists, but the rates differ depending on use. The two biggest errors are:

• Claiming the off-road rate for on-road travel: Your truck driving between jobs is on-road use (lower rate). The chipper running at the job site is off-road use (higher rate). You need to track both separately.
• Not claiming at all: Many smaller arborists do not realise they can claim fuel tax credits on the diesel their wood chipper, stump grinder, and other plant equipment burns through. On a busy chipper doing 50 litres a day, that is roughly $25 per day or $6,500 per year you are leaving on the table.

You need fuel purchase records (receipts or supplier statements) that show the quantity of fuel purchased. A reasonable basis for splitting fuel between on-road and off-road use is essential. Read our full fuel tax credits breakdown for the current rates and claiming method.

3. Missing Subcontractor Withholding Obligations

If a subcontractor does not quote their ABN on an invoice, you must withhold 47% from the payment and report it on your BAS at label W3. This catches out arborists who use casual climbers or groundsmen as subcontractors without proper paperwork.

Even when a subcontractor does provide an ABN, you may have a voluntary withholding agreement in place, which also needs reporting. And if the ATO determines that your “subcontractors” are actually employees (a common finding in tree care), you face back-payment of PAYG withholding, super, and penalties. For more on this risk, see our PAYG withholding guide for arborists.

4. Cash Jobs Not Reported

The ATO’s data-matching capability is far more advanced than most arborists realise. They cross-reference your reported income against bank deposits, supplier data, council permit records, insurance claims, and even social media posts showing completed jobs. If you remove a large tree and get paid $5,000 in cash, the council development application, the tip receipt for the green waste, and the fuel purchases that day all leave a data trail.

Every dollar of revenue must appear on your BAS at label G1. Omitting cash income is tax evasion, and the penalties are severe: up to 75% of the tax shortfall plus interest.

5. Wrong Reporting Period

Arborist jobs can span weeks. A large land-clearing contract might start in March (Q3) and finish in April (Q4). The GST rule is that you report the income in the period you issue the invoice or receive payment, whichever comes first. If you invoice in March but the customer pays in April, the income goes on your Q3 BAS.

Similarly, if you receive a deposit in Q3 and the balance in Q4, the deposit is reported in Q3 and the balance in Q4. Getting this wrong throws out your GST calculations and creates mismatches the ATO will query.

6. Forgetting to Reverse GST on Bad Debts

Arborists doing commercial work or council contracts sometimes face slow-paying or non-paying clients. If you have reported GST on a sale and the debt remains unpaid for 12 months or more (and you have written it off), you can claim back the GST on your BAS as a decreasing adjustment. Many arborists do not know about this and effectively pay GST on income they never received.

PAYG Withholding for Arborist Employers

If you employ climbers, ground crew, or admin staff, you must withhold PAYG tax from their wages and report it on your BAS. This is non-negotiable and one of the ATO’s highest compliance priorities.

What You Must Withhold

PAYG withholding applies to:

• Ordinary wages and salary
• Overtime payments
• Allowances (travel, tool, height)
• Bonuses and commissions
• Director fees
• Termination payments (specific withholding rates apply)
• Working holiday maker payments (15% flat rate up to $45,000)

Use the ATO’s tax tables or your payroll software to calculate the correct withholding amount. The amount depends on the employee’s tax file number declaration, their residency status, and whether they have a HELP/HECS debt or claim the tax-free threshold.

Common PAYG Issues in Arborist Businesses

The tree care industry has specific PAYG risks:

• Sham contracting: Paying a climber as a subcontractor when they work set hours, use your equipment, and only work for you. The ATO treats them as an employee, and you owe back-withholding plus penalties.
• No TFN declaration: If an employee does not give you a Tax File Number declaration within 14 days of starting, you must withhold at the top marginal rate (47%). Many arborists forget this for casual workers.
• Allowances not withheld correctly: Height allowances and travel allowances paid to arborist employees are subject to PAYG withholding unless they fall within the ATO’s reasonable amounts published each year.

For the full breakdown on withholding obligations and penalties, read our PAYG withholding guide for arborist employers.

PAYG Instalments: How They Work for Growing Arborist Businesses

PAYG instalments are separate from PAYG withholding. This is a prepayment of your own income tax (or your company’s income tax), collected in instalments throughout the year so you do not face a massive tax bill at year end.

The ATO will notify you to pay PAYG instalments once your business or investment income reaches certain thresholds (generally above $4,000 in tax owed in the prior year for individuals, or any company that lodged an income tax return with tax payable).

Two Methods for Calculating Instalments

1. ATO instalment amount: The ATO tells you a fixed dollar amount to pay each quarter. Simple, but it does not adjust if your income drops. This suits arborists with stable, predictable revenue.
2. Instalment rate method: You report your actual business income for the quarter and multiply it by the ATO-provided instalment rate. This suits arborists with seasonal fluctuations, as you pay less in quiet quarters and more in busy ones.

Most arborist businesses benefit from the instalment rate method because tree work is seasonal. If your Q3 (January to March) is storm season and you earn double your normal revenue, you pay more that quarter. If Q2 is quiet, you pay less. This avoids overpaying in slow periods.

Varying Your PAYG Instalments

If your income has dropped significantly (say you lost a major council contract or had equipment downtime), you can vary your PAYG instalments to a lower amount. Lodge the variation through your BAS at label T7 (varied amount) or T8 (varied rate). Be careful: if you vary too low and underpay by more than 15%, the ATO charges the general interest charge on the shortfall.

Record-Keeping Requirements Specific to BAS

The ATO requires you to keep records that substantiate every figure on your BAS for at least five years. For arborist businesses, this means maintaining:

Sales Records

• Tax invoices issued for every job over $82.50 (including GST)
• Records of cash payments received
• Bank statements showing deposits
• Quotes and job sheets tied to invoices

Purchase Records

• Tax invoices from suppliers (fuel, equipment, parts, PPE, insurance)
• Receipts for purchases under $82.50
• Subcontractor invoices showing ABN and GST status
• Hire purchase and lease agreements for financed equipment
• Import documents if buying equipment from overseas

Fuel Records for Fuel Tax Credits

• Fuel purchase receipts showing litres purchased
• Logbooks or GPS records to split on-road and off-road use
• Equipment run-hours logs (many modern chippers and stump grinders have hour meters)
• Bulk fuel storage records if you have an on-site tank

Payroll Records

• Employee TFN declarations
• Payroll summaries showing gross wages, PAYG withheld, super, and allowances
• Subcontractor statements (Taxable Payments Annual Report data)
• Voluntary withholding agreements

Use cloud accounting software like Xero, MYOB, or QuickBooks. Paper-based records are still legal but make BAS preparation slower, more expensive, and more error-prone. Most arborist businesses using cloud software can have their BAS prepared in under two hours per quarter. Paper-based businesses take five to ten hours. If you want to claim arborist-specific tax deductions, your records need to be airtight.

What Happens When You Lodge Late: Penalties, Interest and ATO Enforcement

Late BAS lodgement is not a minor issue. The ATO has been ramping up enforcement, and arborists are squarely in their sights due to the industry’s historical cash economy profile.

Failure to Lodge (FTL) Penalty

If you lodge your BAS late, the ATO can apply a Failure to Lodge penalty calculated in penalty units:

• Small entities (under $1 million turnover): 1 penalty unit for each 28-day period (or part thereof) that the BAS is overdue, capped at 5 penalty units.
• Medium entities ($1 million to $20 million): 2 penalty units per 28-day period, capped at 10 penalty units.
• Large entities (over $20 million): 5 penalty units per 28-day period, capped at 25 penalty units.

One penalty unit is currently $330 (as at 2025-26). For a typical arborist business turning over $500,000 to $2 million, a BAS that is three months late could attract a penalty of $660 to $1,320. That is money straight out of your pocket for no reason.

General Interest Charge (GIC)

On top of the FTL penalty, any unpaid tax attracts the General Interest Charge. The GIC rate is currently 11.38% per annum, compounding daily. If your quarterly BAS has a $15,000 GST liability and you pay it 90 days late, you are looking at roughly $420 in interest alone. The GIC rate is reviewed quarterly by the ATO and is deliberately set above commercial lending rates to discourage late payment.

Escalation Path

The ATO’s enforcement follows a predictable escalation:

1. Reminder notice (shortly after the due date)
2. FTL penalty notice
3. Default assessment (the ATO estimates your liability, usually higher than the actual amount)
4. Director penalty notice (for company directors, making you personally liable)
5. Debt recovery action (garnishee notices on your bank account, supplier payments, or customer payments)

Director penalty notices deserve special attention. If your company fails to lodge a BAS within three months of the due date, the ATO can issue a director penalty notice that makes you personally liable for the unpaid PAYG withholding and super guarantee charge. This liability cannot be discharged by putting the company into liquidation if the BAS was more than three months overdue. You are personally on the hook.

Penalty Remission

The ATO can remit penalties in full or in part if you have a reasonable excuse. Genuine reasons include serious illness, natural disaster (bushfire, flood), death of a family member, or a significant accounting system failure. “I was too busy doing tree work” is not a reasonable excuse. Neither is “my bookkeeper did not do it.” As the business owner, the obligation is yours.

If you are behind on BAS lodgements, the best course of action is to engage a tax compliance specialist to bring everything up to date. The ATO is generally more lenient with businesses that voluntarily come forward than those they have to chase.

Practical BAS Preparation Checklist for Arborists

Use this checklist at the end of each quarter before lodging your BAS:

1. Reconcile your bank accounts to your accounting software. Every transaction should be coded.
2. Check all sales invoices are recorded and GST is correctly applied. Cross-reference against your job management system.
3. Review supplier invoices for correct GST treatment. Ensure you have valid tax invoices for all claims over $82.50.
4. Separate capital and non-capital purchases. Any equipment over $300 with a useful life beyond the current year goes to G10.
5. Calculate fuel tax credits. Split fuel between on-road and off-road use. Apply the correct rate to each category.
6. Reconcile payroll. Ensure PAYG withholding on your BAS matches your payroll records exactly. Check that all employees have current TFN declarations on file.
7. Review subcontractor payments. Confirm all subcontractors have quoted their ABN. Withhold 47% from any payments where no ABN was provided.
8. Check PAYG instalments. If your income has changed significantly, consider varying your instalment amount.
9. Review prior quarter adjustments. Include any corrections from the previous quarter (bad debt adjustments, reclassified transactions).
10. Lodge and pay by the due date. Set a calendar reminder for two weeks before the deadline.

Frequently Asked Questions

Do arborists need to lodge a BAS if they earn under $75,000?

If your annual turnover is under $75,000, you are not required to register for GST or lodge a BAS for GST purposes. However, if you have employees and withhold PAYG tax from their wages, you still need to lodge a BAS to report those withholding amounts. You can also voluntarily register for GST below the threshold, which lets you claim GST credits on equipment and expenses. This often makes sense for new arborist businesses making large equipment purchases in their first year.

Can I claim fuel tax credits for diesel used in my wood chipper?

Yes. Diesel used in a wood chipper is classified as off-road business use and attracts the higher fuel tax credit rate (at the current ATO rate – check ato.gov.au for the latest figure as rates change every six months). The same applies to stump grinders, generators, and any other equipment that does not travel on public roads. You need fuel purchase records showing the quantity bought and a reasonable basis for estimating how much fuel each piece of equipment consumed. Hour meters on equipment are the most reliable method.

What happens if my subcontractor does not have an ABN?

You must withhold 47% of the payment and remit it to the ATO via your BAS (reported at label W3). This is called “no ABN withholding.” The subcontractor can claim the withheld amount as a credit when they lodge their own tax return. To avoid this situation, always verify a subcontractor’s ABN on the Australian Business Register before making any payment. If someone claims to have an ABN but cannot provide it, treat the payment as requiring withholding.

How do I report a large equipment purchase on my BAS?

Report the GST-inclusive purchase price at label G10 (capital purchases). The GST component (1/11th of the price) will be included in your label 1B GST credit. For example, if you buy a $220,000 crane truck (GST-inclusive), you report $220,000 at G10 and claim $20,000 in GST credits at 1B. If the equipment is financed through a chattel mortgage or hire purchase, you can generally claim the full GST credit upfront in the quarter of purchase, regardless of the finance term.

Should I use a BAS agent or lodge myself?

If your arborist business has employees, claims fuel tax credits, and turns over more than $200,000, a registered BAS agent or tax agent will almost certainly save you money. They reduce errors that trigger ATO amendments and penalties, they claim deductions and credits you might miss (particularly fuel tax credits), and they give you extended lodgement deadlines. Typical BAS agent fees for an arborist business range from $300 to $750 per quarter. One missed fuel tax credit claim can exceed that cost.

Can the ATO garnish my business bank account for unpaid BAS?

Yes. If you have an outstanding BAS debt and have not responded to the ATO’s collection efforts, they can issue a garnishee notice to your bank, directing the bank to pay the ATO directly from your account. They can also issue garnishee notices to your customers, redirecting payments owed to you straight to the ATO. This is more common than arborists expect, particularly for businesses with multiple overdue BAS lodgements. The best protection is staying current with your lodgements and contacting the ATO early if you cannot pay on time to arrange a payment plan.

Get Your BAS Right the First Time

Getting your BAS right is the foundation for effective tax planning. Once your lodgements are in order, explore our 15 EOFY tax strategies for arborists and our instant asset write-off guide to maximise your deductions before 30 June 2026.