BAS Submission Dates: Your 2026 Lodgement & Payment Guide

The standard quarterly BAS submission dates for self-lodgers in the 2025-26 financial year are 28 October 2025, 28 February 2026, 28 April 2026, and 28 July 2026. If you lodge your own BAS, those are the key dates to plan around, and payment is generally due on the same day.

Tom, a Brisbane tradie, finishes a week of invoices, supplier calls, and payroll checks, then remembers his BAS is coming up. That moment is common. The issue usually isn't knowing BAS exists. It's knowing which date applies to your business, whether an agent changes the date, and how to avoid turning a routine lodgement into a penalty problem.

BAS Submission Dates: Your 2026 Lodgement & Payment Guide

By Panbo Ye, CFP® | FCPA | SSA® | Founder, Everglow

Who this article is for: Australian business owners, not-for-profit managers, and financial controllers seeking clarity on their ATO lodgement and payment obligations.

Introduction

BAS submission dates matter because they sit at the meeting point of compliance, cash flow, and record-keeping. A late BAS can affect more than one quarter. It can also create avoidable pressure on payroll, supplier payments, and decision-making if the numbers haven't been finalised properly before the deadline.

In practice, businesses usually fall into one of three reporting cycles: monthly, quarterly, or annual. The right cycle depends on your GST position and, in some cases, your turnover or an election you make with the Australian Taxation Office (ATO). Getting the cycle right comes first. Only then do the dates make sense.

Practical rule: If you're unsure which date applies, check your reporting cycle before you check your calendar. The wrong cycle makes the right date useless.

Understanding Your BAS Reporting Cycle

Your reporting cycle determines the rhythm of your BAS obligations. For many businesses, the cycle is stable for long periods. For others, especially growing businesses, not-for-profits, and newly established entities, the cycle may change as turnover or registration settings change.

Monthly reporting

Businesses reporting monthly generally have tighter compliance windows. Monthly BAS reporters, typically businesses with GST turnover exceeding $20 million, face deadlines on the 21st day of the following month. The same source notes that failure-to-lodge penalties start at $330 and escalate every 28 days, while General Interest Charge may accrue daily at rates often around 10-12% annually (Current as at 07/2025). Annually reporting businesses that are voluntarily GST-registered with turnover under $75,000, or $150,000 for not-for-profits, have a 31 October 2026 deadline for the 2025-26 financial year, according to QuickBooks Australia's BAS due dates summary.

Monthly reporting can suit larger businesses that want more regular visibility over GST and withholding positions. It can also be elected voluntarily in some cases, but that only works if the bookkeeping is disciplined enough to support a tighter close process.

Quarterly and annual reporting

Quarterly reporting remains the familiar cycle for many Australian businesses. Annual reporting is narrower and usually relevant only where GST registration is voluntary and eligibility conditions are met.

If you're reviewing your position, start with a proper understanding of GST turnover and how the ATO uses it. That usually answers the first practical question: which cycle should apply?

For owners working across jurisdictions, it's also useful to compare how other systems frame filing cadence and portal obligations. A good example is filing VAT with the FTA portal, which shows how reporting frequency affects internal finance processes even when the tax system itself is different.

• Monthly cycle: Typically applies where GST turnover exceeds $20 million.
• Quarterly cycle: Common for smaller businesses and the default many owners recognise in day-to-day operations.
• Annual cycle: May apply where GST registration is voluntary and turnover is under $75,000, or $150,000 for not-for-profits.

The first compliance step isn't memorising dates. It's confirming the reporting cycle the ATO expects from your business.

Quarterly BAS Submission Dates for 2025-2026

Quarterly reporting is the cycle most small business owners care about because it's the one they live with every quarter, every year. Over 60% of Australian SMEs with GST turnover under $20 million opt for quarterly BAS reporting, according to EEA Advisory's summary of 2025-26 BAS due dates.

The following dates apply to businesses that prepare and lodge their own quarterly BAS (Current as at 07/2025).

For self-lodgers, the practical point is simple. The lodgement date and payment date are usually the same date. If you owe GST, PAYG withholding, PAYG instalments, or another BAS amount, don't treat lodgement and payment as separate tasks unless the ATO has specifically advised otherwise.

What tends to trip people up

Q2 often catches owners because the due date sits later in the calendar than the other quarters. That can create a false sense of extra time. In reality, January closures, leave periods, and delayed bookkeeping often compress the useful preparation window.

If you'd like a broader tax calendar reference, see this guide to Australian tax due dates for businesses and individuals.

• Q2 is different: It falls due on 28 February 2026, not on the same pattern business owners often expect from the other quarters.
• Weekends and holidays matter: If a due date falls on a weekend or public holiday, it shifts to the next business day.
• Self-lodgement means discipline: You need your reconciliations, coding, and payroll figures ready before the due date, not on it.

Mark these dates early and work backwards from them. BAS stress usually comes from unfinished records, not from the date itself.

How a BAS Agent Changes Your Lodgement Dates

Engaging a registered BAS agent or tax agent may provide breathing room, but only where the ATO concession rules are met. It's not an automatic extension because a business decides to use an adviser after the quarter has ended.

The dates that change

According to A One Outsourcing's BAS due date guide, registered BAS agents gain lodgement concessions only if prior statements were electronically lodged and the client is ATO-compliant. For the 2025-26 financial year, the extended dates are:

• Q1: 25 November 2025
• Q3: 26 May 2026
• Q4: 25 August 2026
• Q2: No extension. It remains due on 28 February 2026.

That means the trade-off isn't just "agent versus no agent". It's really "organised compliance versus last-minute rescue". Owners sometimes assume an adviser can create more time after the deadline pressure appears. That's rarely how it works well.

What works and what doesn't

What works is engaging early, keeping records current, and making sure prior lodgements have been managed properly. What doesn't work is handing over incomplete records near the deadline and expecting the concession to solve poor internal processes.

A registered adviser may also reduce practical error risk because the BAS is reviewed through a tax lens, not just produced from bookkeeping software. That's particularly useful where payroll, GST coding, mixed-use costs, or entity structures add complexity.

If you're considering outsourced support, this overview of small business accounting services sets out the kind of help owners typically use when BAS preparation becomes repetitive or risky.

Agent concessions are useful. Clean records are better. The strongest compliance position uses both.

A BAS agent may give you more time on some quarters, but only early engagement and good compliance habits make that time available.

What Happens If You Lodge or Pay Your BAS Late?

A late BAS usually creates two separate exposures. Lodgement penalties apply if the form is not lodged on time. Interest can apply if the amount owing is not paid by the due date. Those consequences often arrive together, but they are administered differently and need different responses.

For a practice owner, charity treasurer, or newly arrived business operator still adjusting to Australian reporting rules, that distinction matters. A medical practitioner with PSI concerns may have clean clinical income records but weak GST coding on overheads. A not-for-profit may be dealing with grants, fundraising, and volunteer-run administration. A Chinese enterprise entering Australia may be profitable yet still miss BAS deadlines because the local tax calendar, payment references, and lodgement process work differently from what the finance team expects.

The practical rule is simple. Lodge on time even if you cannot pay in full. Lodging late can trigger failure-to-lodge consequences. Paying late can trigger interest on the unpaid balance. If both happen, the problem is larger than it needed to be.

A common pattern looks like this. The quarter ends, bank accounts have not been reconciled, payroll figures are still being checked, and one or two supplier accounts have uncertain GST treatment. The BAS is deferred while the records are cleaned up. Then the due date passes. At that point, the issue is no longer just bookkeeping quality. It becomes a compliance matter.

What usually helps:

• Lodge as soon as the figures are reliable, even if cash flow is tight
• Contact the ATO early if payment will be late or difficult
• Keep evidence of the steps taken, including payment plans or correspondence
• Fix the record-keeping process that caused the delay, rather than treating each quarter as an isolated problem

What I see in practice is that late BAS problems rarely start with refusal to comply. They start with process drift. Payroll is finalised late. Expense coding is left until quarter end. One person holds too much of the finance function in their head. For professional groups with mixed revenue types or unusual entity arrangements, small delays can turn into missed dates quickly.

If you are already behind, this guide to ATO fines for late lodgement explains the likely consequences in more practical detail. For broader cash reserving discipline, Comfi SME financial planning for corporate tax is a useful reference point, even though BAS sits under a different Australian tax framework.

The steadier approach is early lodgement, prompt contact, and records that are kept current enough to support the numbers before the deadline arrives.

Worked Example: Dr Sharma's Quarterly BAS

Dr Anya Sharma runs a sole trader GP practice in Sydney and works from rooms in the inner west. Her September quarter records are mostly in order, but she still needs to separate GST-bearing expenses from items that don't carry GST and confirm payroll figures for her receptionist before lodging.

The mechanics of BAS preparation are familiar. The judgment sits in classification. That matters even more for medical professionals because some supplies may be GST-free, while other business costs still create input tax credit questions.

How the quarter is reviewed

Dr Sharma starts with her software reports, then checks bank reconciliations, payroll summaries, and tax invoices. She doesn't rely on the BAS summary screen alone. She reviews whether the coding reflects the substance of the transaction.

She also checks whether any Personal Services Income considerations affect the broader tax picture. PSI doesn't change the BAS dates themselves, but it can affect how practitioners think about structure, deductions, and record-keeping discipline across the year.

A BAS should be the output of clean records, not the start of the clean-up.

The decision point

Her self-lodgement deadline for the September quarter is 28 October 2025. If she were eligible under the agent concession rules discussed earlier, the Q1 date could extend to 25 November 2025. The extra time may help, but only if the records are complete enough for review.

For Dr Sharma, the core decision isn't whether an adviser can press a different button. It's whether the time saved, review quality, and reduced pressure justify professional support. For many practitioners, that's less about speed and more about preserving clinical focus while maintaining orderly compliance.

• Focus on classification: Health services can involve GST distinctions that deserve careful review.
• Check payroll before lodgement: PAYG withholding errors can flow through to BAS reporting.
• Use the quarter to improve the year: Each BAS period is a checkpoint for systems, not just a form-filling exercise.

Good BAS preparation supports cash flow because it turns uncertain tax exposure into a managed obligation before the due date arrives.

Special Considerations and Tips

The BAS rules are standard. Their application rarely is. Industry, structure, language, software habits, and internal controls all shape how easy or difficult compliance feels in practice.

For Medical and Allied Health Professionals

Medical and allied health operators often deal with GST treatment that isn't intuitive from a plain bookkeeping view. The issue usually isn't the calendar. It's whether the transactions feeding the BAS have been coded with enough care.

Practitioners should also keep PSI in mind where income is closely tied to personal effort. That sits alongside BAS compliance rather than replacing it. A sound workflow uses regular bookkeeping reviews, clear invoice support, and payroll checking before the quarter closes.

For Not-for-Profits

Not-for-profits need to pay attention to registration status, eligibility settings, and internal governance. Even where annual reporting may be available to some voluntarily registered entities, the finance team still needs a proper year-round record trail.

The accounting system matters here. Selecting software that supports document capture, approvals, and clean chart-of-account structure can make quarterly or annual compliance far less fragile. This comparison of accounting software options for Australian small businesses is a helpful starting point when existing systems are creating BAS friction.

For New Migrants and Overseas Businesses

Some of the hardest BAS issues aren't technical. They're practical. Language, unfamiliar portals, different compliance habits, and uncertainty about what the ATO expects can all create delay.

According to TTS Associates' discussion of BAS dates and tax agent extensions, data suggests migrant-owned businesses can have higher rates of late lodgement due to unfamiliarity with Australian tax systems. The same source notes that engaging an agent early is important because self-lodgers miss buffers such as the Q1 extension to 25 November 2025 and Q3 extension to 26 May 2026, and bilingual support may reduce errors for businesses entering Australia after the post-2025 migration surge.

• Keep source records together: Tax invoices, payroll reports, and bank records should be stored in one consistent system.
• Close the quarter before the deadline: Don't leave coding, reconciliations, and review to the final days.
• Get help early if the system is unfamiliar: That's especially important for overseas owners and newly arrived professionals.

BAS dates are fixed, but the compliance pressure around them depends heavily on your structure, industry, and internal systems.

Frequently Asked Questions about BAS Dates

What is the difference between a BAS and an IAS?
A BAS is a broader activity statement commonly used to report GST and other obligations. An IAS is generally used in more limited situations, often for instalments or withholding outside the regular BAS cycle. The right form depends on what the ATO has issued to your entity and how your registration settings are configured.

Is the payment due date always the same as the lodgement due date?
For many self-lodged quarterly BAS obligations, yes, payment is due on the same day as lodgement. But don't assume that applies in every circumstance without checking the statement itself. The safest approach is to read the issued activity statement and confirm the due date shown by the ATO.

What should I do if I made a mistake on a past BAS?
Don't ignore it and don't guess your way through the correction. Some errors may be corrected in a later BAS, while others may need a revision of the original statement depending on the type and size of the error. If you want specific help, you can contact Everglow for guidance on the appropriate path.

How do I lodge my BAS online?
Many businesses lodge through the ATO's online services, through myGov-linked services where relevant, or through tax and BAS agent software. Online lodgement can help with tracking and record retention, but it only works well if your bookkeeping has been finalised before you log in to submit.

Can I change from quarterly to monthly reporting?
In some cases, yes. But changing frequency should be a considered decision, not a reaction to one difficult quarter. Monthly reporting may improve visibility, yet it also demands faster reconciliations, stronger payroll processes, and more consistent bookkeeping discipline throughout the year.

If you would like clarity on how these principles may apply to your own circumstances, contact Everglow Prosperity on 1300 913 929 or email contact@everglow.au. To book directly: Book a meeting with Panbo.