01/04/2026 • 8 min read
What is the BAS lodgement deadline for 2026?
If you are searching for the BAS lodgement deadline 2026, the first thing to know is that your exact due date depends on how your business reports GST and PAYG withholding to the ATO. Most Australian businesses lodge their Business Activity Statement (BAS) either monthly or quarterly, while some may have annual GST reporting obligations.
In general, quarterly BAS due dates follow the standard ATO pattern:
- Quarter 1 (July to September): 28 October
- Quarter 2 (October to December): 28 February
- Quarter 3 (January to March): 28 April
- Quarter 4 (April to June): 28 July
If you lodge through a registered tax or BAS agent, you may be eligible for extended lodgement concessions, depending on your circumstances and whether prior lodgements are up to date.
Because ATO calendars can be updated and some due dates shift when they fall on a weekend or public holiday, it is important to confirm your specific obligations directly with the ATO or your registered accountant or BAS agent.
2026 quarterly BAS lodgement deadlines
For businesses lodging quarterly, these are the key dates to keep in mind during the 2026 calendar year.
Quarter 2 BAS 2026
This relates to the period 1 October to 31 December 2025. The standard due date is:
- 28 February 2026
If you lodge online yourself, the ATO often provides a short additional concession for eligible quarterly activity statements. However, this may not apply in all cases, especially where payment is overdue or prior statements have not been lodged.
Quarter 3 BAS 2026
This relates to the period 1 January to 31 March 2026. The standard due date is:
- 28 April 2026
Quarter 4 BAS 2026
This relates to the period 1 April to 30 June 2026. The standard due date is:
- 28 July 2026
Quarter 1 BAS for the 2026–27 financial year
Although this falls later in the year, many business owners planning ahead for the BAS lodgement deadline 2026 also want to note the first quarterly due date for the new financial year. For the period 1 July to 30 September 2026, the standard due date is:
- 28 October 2026
Monthly BAS due dates in 2026
If your business reports GST monthly, your BAS is generally due on the 21st day of the following month. For example:
- January 2026 BAS: due 21 February 2026
- February 2026 BAS: due 21 March 2026
- March 2026 BAS: due 21 April 2026
- April 2026 BAS: due 21 May 2026
- May 2026 BAS: due 21 June 2026
- June 2026 BAS: due 21 July 2026
Monthly lodgers should keep an especially close eye on due dates because the turnaround time is much shorter than for quarterly reporting. This can be challenging where bookkeeping is behind, bank accounts are not reconciled, or source documents are incomplete.
What information is usually included in a BAS?
Your BAS may include one or more of the following obligations:
- GST collected on sales and paid on purchases
- PAYG withholding amounts withheld from employee wages
- PAYG instalments
- Fuel tax credits, where applicable
- Other tax reporting obligations depending on your registration profile
For many small businesses, the BAS is not just a formality. It is one of the key compliance checkpoints that reveals whether bookkeeping is current, whether GST coding has been applied correctly, and whether payroll and STP-related records align with ATO expectations.
What happens if you miss a BAS lodgement deadline?
Missing a BAS due date can create several problems for businesses:
- Failure to lodge on time (FTL) penalties
- General interest charges on unpaid amounts
- Increased ATO scrutiny if late lodgements become a pattern
- Cash flow stress if liabilities are discovered too late
- Compounding compliance issues if multiple quarters are overdue
For accountants and bookkeepers, overdue BAS work often becomes more expensive and time-consuming because the underlying records may need to be reconstructed before figures can be trusted. This is particularly common with clients who have missing invoices, unreconciled bank transactions, or several quarters of backlog.
Why BAS lodgements get delayed
There are a few recurring reasons businesses miss the BAS lodgement deadline 2026:
- Bank accounts have not been reconciled
- Receipts and tax invoices are incomplete
- GST has been coded inconsistently
- Payroll records and PAYG withholding figures do not match
- The business changed software or stopped using bookkeeping software altogether
- The owner underestimated how long catch-up work would take
These issues are especially common in small businesses that are growing quickly, changing staff, or trying to manage compliance internally without enough time or systems in place.
How to prepare for your next BAS on time
If you want to avoid last-minute pressure next quarter, a structured BAS process can make a significant difference.
1. Reconcile bank accounts early
Do not wait until the due date is approaching. Reconciling bank transactions weekly or monthly gives you time to identify missing entries, duplicate transactions, or GST coding errors before they affect the BAS.
2. Check GST treatment on common transactions
Review whether sales and expenses have been coded correctly for GST. Errors often occur with mixed supplies, motor vehicle expenses, software subscriptions, bank fees, and imported services.
3. Make sure supporting documents are complete
Keep tax invoices, receipts, and supplier records organised. If the ATO ever reviews your BAS, the numbers should be backed by proper documentation.
4. Review payroll and PAYG withholding
If you have employees, compare payroll reports, STP submissions, and BAS figures to make sure they align. Small discrepancies can create larger year-end problems.
5. Leave time for adviser review
If your accountant or BAS agent is lodging on your behalf, send records well before the deadline. Agent concessions do not remove the need for timely and accurate information from the client.
How Fedix can help with lodging next quarter BAS
For businesses and accounting firms dealing with messy records or catch-up bookkeeping, getting ready for the next BAS can feel harder than the lodgement itself. This is where the right workflow and tools can help.
Fedix, built in Australia for Australian accountants, is designed for situations where records are incomplete, behind, or difficult to reconcile. Its core platform, MyLedger, is particularly useful when a business has bank statements but not clean bookkeeping files.
Two features are especially relevant for preparing and lodging your next quarter BAS:
- 1-Click Bank Reconciliation: MyLedger can transform bank statements, including PDFs, scans and screenshots, into reconciled accounting data far faster than manual processing. This helps bring records up to date before BAS preparation begins.
- AI Working Papers: Fedix can automatically generate BAS and GST reconciliation checks, helping accountants and bookkeepers review figures before lodgement.
For clients who are behind, this can reduce the bottleneck between “we need to lodge” and “we finally trust the numbers.” It is especially useful for firms handling shoebox clients, historical cleanup, or quarter-on-quarter catch-up work.
As one Sydney CPA put it: “Cut BAS prep time from 2 days to 1 hour.” — Grace Chan, CPA, Sydney
That kind of time saving matters when the next BAS deadline is approaching and the bookkeeping is still not fully sorted.
Tips for clients who want a smoother BAS next quarter
If you are a business owner, there are practical steps you can take now to make next quarter easier for your accountant or BAS agent:
- Send bank statements as soon as the quarter ends
- Upload receipts and supplier invoices regularly, not all at once
- Separate business and personal spending where possible
- Flag unusual transactions early
- Respond quickly to bookkeeping queries
- Ask your adviser what documents they need before the next BAS cycle starts
Even if your records are behind today, the next quarter does not have to be. A better process now can reduce stress, avoid late lodgement, and improve visibility over GST and cash flow.
Should you lodge yourself or use a BAS agent or accountant?
Some business owners lodge their own BAS through online accounting software or the ATO’s online services. That can work if bookkeeping is current and the GST treatment of transactions is straightforward.
However, if your records are behind, your industry has more complex GST issues, or you are unsure whether prior quarters were handled correctly, using a registered BAS agent or accountant is often the safer option. The cost of getting professional help is usually much lower than the cost of repeated errors, ATO penalties, or poor cash flow decisions based on inaccurate numbers.
Final reminder on BAS lodgement deadline 2026
The main BAS lodgement deadline 2026 dates for quarterly lodgers are generally 28 February, 28 April, 28 July and 28 October, depending on the reporting period. Monthly lodgers usually need to lodge by the 21st of the following month.
The key is not just knowing the deadline, but being ready for it. If your records are clean, BAS lodgement is routine. If they are behind, the real work is in getting the data accurate before submission.
For businesses and accounting firms wanting a faster path to next quarter’s BAS, tools like Fedix MyLedger can help streamline bank reconciliation and BAS review workflows, especially where records are incomplete or catch-up work is involved. 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.