25 August 2026 BAS Lodgement Concession: The Australian Accounting Priority Practices Should Clear This Month

For Australian accounting practices, August 2026 is not just “tax return season”. One of the most relevant and timely compliance tasks right now is the 25 August 2026 lodgement and payment deadline for the June 2026 quarterly BAS for eligible clients lodged through a registered tax or BAS agent.

This topic matters because the June quarter BAS is often the final GST checkpoint for the 2025–26 financial year. It is where accountants and bookkeepers can catch issues before they flow into income tax returns, financial statements, Division 7A reviews, trust distribution minutes, taxable payments annual reports, payroll reconciliations and ATO debt discussions.

For small business owners, it is also a cash flow deadline. If the BAS includes GST payable, PAYG withholding, PAYG instalments, fuel tax credits or fringe benefits tax instalments, the amount due can be material — especially after a busy June quarter.

Why 25 August 2026 is the BAS date to watch

Most quarterly BAS lodgers have a standard due date of 28 July for the April to June quarter. However, where the activity statement is lodged through a registered tax agent or BAS agent and the client is eligible for the lodgement program concession, the due date is generally extended to 25 August 2026.

That makes August the practical deadline for many accounting firms managing small business BAS work at scale.

The June quarter BAS generally covers:

• GST collected and paid for 1 April to 30 June 2026
• PAYG withholding reported at W1 and W2
• PAYG instalments for income tax, if applicable
• Fuel tax credits, where the business is eligible
• FBT instalments, for relevant employers
• Adjustments, corrections and annual GST reconciliation matters

The deadline is especially important this year because many firms are still handling post-EOFY clean-up, 2026 tax return preparation, TPAR work due by 28 August, and payroll checks after STP finalisation. If BAS review is left too late, errors can multiply across multiple compliance jobs.

Who should prioritise the June quarter BAS in August 2026?

Not every client needs the same level of review. Practices should triage their August BAS list based on risk, complexity and data quality.

High-priority clients

• Businesses that lodged late or amended BAS during 2025–26
• Clients with messy records, bank-only data or incomplete bookkeeping
• Cash-based businesses with frequent transfers, owner drawings or private expenses
• Employers with payroll, PAYG withholding and superannuation obligations
• Construction, cleaning, courier, IT, road freight and security businesses also preparing TPAR by 28 August 2026
• Businesses with large GST refunds or unusual GST fluctuations
• Clients with ATO payment arrangements or existing tax debt
• Businesses that changed software, bookkeeper or bank accounts during the year

Lower-risk clients

• Clients with monthly reconciled cloud files and no major GST adjustments
• Businesses with consistent quarterly BAS patterns
• Clients with minimal payroll and no complex GST transactions
• Entities already reviewed as part of June 2026 EOFY work

A practical approach is to review high-risk clients first, then batch-process lower-risk files once source documents and bank data are complete.

June quarter BAS review checklist for August 2026

Before lodging by 25 August 2026, accountants and bookkeepers should complete a structured BAS review. The goal is not only to lodge on time, but to ensure the BAS aligns with the broader 2025–26 compliance file.

1. Confirm the BAS period and lodgement status

• Confirm the activity statement covers 1 April to 30 June 2026
• Check whether the client is eligible for the 25 August 2026 agent concession
• Review ATO Online services for overdue BAS or prior-period amendments
• Confirm payment due date and whether a payment arrangement is required

2. Reconcile all bank accounts to 30 June 2026

A June quarter BAS should not be prepared from partial data. Bank accounts, credit cards, loan accounts and merchant facilities should be reconciled to 30 June.

• Check closing bank balances against statements
• Identify unreconciled deposits, transfers and duplicate transactions
• Review suspense, clearing and uncategorised accounts
• Separate private expenses from deductible business costs
• Check whether loan repayments include both principal and interest

This is where bank-statement-first workflows are useful for catch-up clients. Tools such as Fedix MyLedger can convert bank statements, including PDFs, scans and screenshots, into reconciled ledger data, helping practices deal with clients who do not have clean software files. This is particularly relevant for August BAS work where incomplete records can delay lodgement.

3. Review GST coding

GST errors in the June quarter can distort both the BAS and the year-end accounts. Common issues include claiming GST on non-deductible items, miscoding GST-free income, and failing to adjust for private use.

• Check GST on motor vehicle expenses and private use adjustments
• Review insurance, stamp duty and bank fees for correct GST treatment
• Check overseas subscriptions and imported services
• Confirm GST treatment of grants, rebates and reimbursements
• Review asset purchases and disposals, especially around 30 June
• Check whether GST has been incorrectly claimed on wages, superannuation or loan repayments

If the business is on a cash basis for GST, ensure unpaid invoices and bills are not incorrectly included. If it is on an accrual basis, ensure debtors and creditors at 30 June are complete.

4. Match PAYG withholding to payroll records

For employers, W1 and W2 need to align with payroll reports and STP records.

• Compare BAS W1 gross wages to payroll summaries
• Compare W2 PAYG withholding to payroll tax withheld
• Review director fees, bonuses and termination payments
• Check whether wages were posted manually as journals and duplicated
• Investigate negative payroll amounts or unusual corrections

Where STP finalisation was completed in July, the June quarter BAS should be consistent with final payroll reporting. Differences are not always wrong, but they should be explainable.

5. Check superannuation timing

Although super guarantee for the June quarter was due by 28 July 2026, the August BAS review is a good time to identify unpaid or late super.

If super was not paid on time, the employer may need to lodge a Super Guarantee Charge statement. The SGC deadline for the June quarter is generally 28 August 2026. Unlike ordinary super contributions, SGC is not tax deductible and includes administration and interest components.

• Confirm June quarter super was received by funds by 28 July 2026
• Identify late payments that may trigger SGC obligations
• Advise clients that cash flow delays do not remove the SGC requirement
• Document advice given to directors and employers

6. Review PAYG instalments

The June quarter BAS may include a PAYG instalment. Accountants should consider whether the instalment amount or rate remains appropriate, especially where the client’s 2025–26 profit has changed significantly.

• Compare instalments paid during the year to expected tax payable
• Assess whether variation is appropriate and defensible
• Warn clients about general interest charge risk if instalments are varied too low
• Document the basis for any variation

For clients with volatile income, August is often the first point where accountants have enough year-end data to identify whether earlier instalments were too high or too low.

Common June quarter BAS errors accountants are seeing in August 2026

Several error patterns tend to appear during August BAS work. These are worth building into your review process.

Duplicate income from bank feeds and invoices

Where clients use accounting software inconsistently, sales can be recorded from invoices and again from bank deposits. This can overstate GST and income.

GST claimed on full motor vehicle purchases without adjustment

Vehicle purchases around 30 June often require careful GST, depreciation and private use treatment. Review the tax invoice, finance contract and business-use percentage before lodging.

ATO payments coded as GST or tax expense

Payments to the ATO are frequently coded incorrectly by clients. BAS payments should be allocated to the correct liabilities rather than treated as deductible expenses.

Owner drawings treated as subcontractor payments

This is especially common in family businesses and sole trader files. Misclassification can affect GST, TPAR, income tax and payroll obligations.

Unreconciled merchant fees

Stripe, Square, Tyro, PayPal and marketplace deposits may arrive net of fees. Accountants should check gross sales, fees and GST treatment rather than relying only on net bank deposits.

Example: Why the August BAS review matters

Consider a building contractor lodging the June quarter BAS through a BAS agent by 25 August 2026. The draft BAS shows GST payable of $18,400. During review, the bookkeeper finds:

• $42,000 of subcontractor payments coded to materials
• $9,600 of GST claimed on loan repayments
• $15,000 of customer deposits duplicated through invoices and bank feeds
• June quarter super paid on 31 July, after the 28 July due date

The BAS position changes materially, the TPAR report needs correction before 28 August, and the employer may need advice on SGC. Without an August review, these errors would likely flow into the 2026 tax return and create ATO audit risk later.

Practical workflow for accounting firms before 25 August 2026

To manage workload, practices should avoid treating all BAS jobs as equal. A simple workflow can reduce bottlenecks.

Step 1: Segment the client list

• Red: messy records, payroll, GST refunds, ATO debt, TPAR overlap
• Amber: mostly reconciled but needs GST or payroll review
• Green: clean files ready for partner or manager sign-off

Step 2: Request missing records early

By the first week of August, request bank statements, loan statements, payroll reports, merchant reports, receipts for large purchases and 30 June supplier statements.

Step 3: Run exception reports

• Transactions coded to suspense or ask-my-accountant accounts
• Negative GST amounts
• Large round-dollar transactions
• Payments to the ATO, super funds and related parties
• Unusual changes in GST payable compared with prior quarters

Step 4: Review before lodging, not after

It is faster to correct a BAS before lodgement than to lodge first and amend later. For high-risk clients, build in manager review time before 25 August.

Step 5: Communicate payment obligations clearly

Clients need to know the amount payable, the due date, payment reference number and consequences of late payment. Where they cannot pay in full, discuss ATO payment arrangement options before the due date.

How technology can support August BAS pressure

August compresses several compliance tasks into a short window. For firms handling catch-up bookkeeping or incomplete client records, automation can reduce manual processing time while still leaving professional judgement with the accountant.

Fedix’s MyLedger 1-Click Bank Reconciliation is designed for accountants who inherit messy records, including bank statements in PDF, scan or screenshot form. Its ATO integration can also help practices retrieve client information, track lodgements and monitor due dates. As Grace Chan, CPA in Sydney, put it: “Cut BAS prep time from 2 days to 1 hour.”

The point is not to remove review. It is to get the ledger to a reviewable state faster, so accountants and bookkeepers can focus on GST treatment, PAYG withholding, SGC risk and client advice.

Final August 2026 BAS action list

• Confirm which clients have a 25 August 2026 BAS lodgement and payment deadline
• Prioritise high-risk clients with payroll, GST refunds, ATO debt or messy records
• Reconcile all bank, credit card and loan accounts to 30 June 2026
• Review GST coding for assets, insurance, private expenses and overseas purchases
• Match PAYG withholding to payroll and STP records
• Check June quarter super was paid by 28 July 2026
• Identify any SGC statement obligations due by 28 August 2026
• Coordinate BAS figures with TPAR, tax return and financial statement preparation
• Tell clients payment amounts and due dates early
• Document review points and advice before lodgement

The bottom line

The most timely Australian accounting topic for August 2026 is not simply “tax time”. For many practices, it is clearing the June quarter BAS lodgement concession by 25 August 2026 while also managing payroll, super, TPAR and year-end tax risks.

A disciplined BAS review this month can prevent amendments, reduce ATO exposure and give clients clearer cash flow expectations. For firms dealing with messy or late records, tools like Fedix can help accelerate the reconciliation and lodgement tracking process. Learn more at fedix.ai.

Disclaimer: This article is for general informational purposes only and does not constitute professional financial or tax advice. Always consult a qualified accountant or tax professional for advice specific to your situation. Fedix.ai provides tools to assist accounting professionals but does not replace professional judgement.