Spoke · Pillar: BAS / GST Compliance

Four BAS deadlines per year. Miss one. Pay penalties per 28-day period.

28 October. 28 February. 28 April. 28 July. The four quarterly BAS deadlines that govern every Australian GST-registered business with under $20M turnover. Lodge electronically and you get four weeks more on three of them. Miss any deadline and the FTL penalty accrues per 28-day period.

Why this lives on XIntelliSync, not on a tax agent's website

BAS quarterly deadlines (28 Oct / 28 Feb / 28 Apr / 28 Jul) attract ATO Failure to Lodge penalties scaled by entity size — small entities $313+ per overdue quarter, large entities $1,565+, escalating with repeat offences. XIntelliSync's automated-tax-deadline-alerts agent surfaces the deadline 14 days, 7 days, and 24 hours before each quarter-end, with the prepared BAS bundle ready for ATO Business Portal upload. We don't lodge on your behalf — that's your tax agent's role or your direct portal action — but we make missing the deadline impossible to do silently. The article below is the deadline schedule, the FTL penalty matrix, and the 4-week tax-agent extension rules.

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Quick answer

BAS quarterly deadlines: 28 October (Q1), 28 February (Q2), 28 April (Q3), 28 July (Q4). Lodging via the ATO Business Portal or via a registered tax agent grants a 4-week extension on Q1, Q3, and Q4 (no extension on Q2 because of the Christmas calendar). Monthly BAS is required above $20M annual turnover. Missing a deadline triggers Failure to Lodge penalties scaled by entity size and number of 28-day periods overdue.

The four quarters

Quarter by quarter. Self-lodgement vs tax-agent lodgement.

Quarterly BAS covers the previous three months. Self-lodgement deadlines are 28 days after each quarter end. Lodging via the ATO Business Portal or via a registered tax agent grants a 4-week extension on Q1, Q3, and Q4.

Q1July – September

Self-lodgement deadline

28 October

Tax-agent / portal extension

25 November

Self-lodgement deadline 28 October. Lodging via the ATO Business Portal or via a registered tax agent grants a 4-week extension to 25 November.

Q2October – December

Self-lodgement deadline

28 February

Tax-agent / portal extension

28 February

Q2 deadline aligned to 28 February for both self-lodgement and tax-agent lodgement (no separate extension because of the Christmas holiday calendar).

Q3January – March

Self-lodgement deadline

28 April

Tax-agent / portal extension

26 May

Self-lodgement deadline 28 April. Tax-agent lodgement granted a 4-week extension to 26 May.

Q4April – June

Self-lodgement deadline

28 July

Tax-agent / portal extension

25 August

Self-lodgement deadline 28 July. Tax-agent lodgement granted a 4-week extension to 25 August.

Failure to Lodge penalty schedule

Entity size. Penalty units per 28-day period.

The FTL penalty scales with entity size and the number of 28-day periods overdue. Penalty unit value is CPI-indexed; confirm current value at ato.gov.au.

  • Small entity

    Annual turnover under $1M

    1 penalty unit per 28-day period (max 5 units per BAS)

    Maximum FTL penalty per overdue BAS scales with the current penalty unit value (CPI-indexed; confirm current value via ato.gov.au).

  • Medium entity

    Annual turnover $1M to $20M

    2 penalty units per 28-day period (max 10 units per BAS)

    Doubled rate over small entity. Repeat lodgement failures attract escalating penalties.

  • Large entity

    Annual turnover above $20M

    5 penalty units per 28-day period (max 25 units per BAS)

    Five-times rate. Large entities required to lodge BAS monthly (not quarterly) which compounds penalty exposure.

  • Significant global entity

    Global parent turnover above $1B

    Higher tier — penalty multiplier of up to 500x in extreme cases

    Reserved for SGE classification. Most AU SMBs do not fall in this tier.

FTL penalty unit values verifiable on ato.gov.au/general/interest-and-penalties/penalties. GIC (general interest charge) on overdue tax accrues separately from FTL penalties.

All 22+ industries served

BAS cycle + GST treatment by industry.

Different industries have different GST classifications, different turnover thresholds, and different TPAR obligations. Below: the most-relevant BAS feature for every industry XIntelliSync serves.

  • Construction

    TPAR mandatory — building & construction industry must report contractor payments annually by 28 August. GST on supplies, GST credits on materials. Progress claim invoicing creates BAS timing complexity.

  • Healthcare

    Many medical services GST-free under Division 38-7 (medical services) and Division 38-10 (other health). Allied health may be partially GST-free. Pharmacy mixed — most prescription medicines GST-free, retail products taxable.

  • Hospitality

    Restaurant meals consumed on-premises taxable at 10% GST. Takeaway food may be GST-free if it qualifies as basic food per Division 38. Liquor always taxable. Tip pooling does not affect GST.

  • Retail

    Most retail goods 10% GST taxable. Basic food items (bread, milk, fresh fruit/veg, plain meat) GST-free under Division 38 Schedule 2. Mixed baskets require per-line classification — software with up-to-date ATO classification codes is essential.

  • Consulting / Professional Services

    Most consulting services 10% GST taxable. Exports of services may be GST-free under Division 38. Sub-contracted work to other GST-registered consultants — GST on supplier invoice claimable as input credit. TPAR may apply for cleaning/IT/security services.

  • Digital / Tech

    Software licences and SaaS subscriptions to AU customers: 10% GST. Exports to overseas customers: typically GST-free under Division 38 export rules. TPAR mandatory for IT services to other businesses. Stripe/payment-processor fees include GST claimable as input credit.

  • Finance

    Most financial supplies INPUT-TAXED under Division 40 — no GST charged on supply, no GST credits claimable on related expenses. Fee-based services (advisory, brokerage) often taxable at 10% GST. Mixed-supply businesses must apportion input credits.

  • Legal

    Legal services 10% GST taxable. Trust account holdings are NOT consideration for supply — no GST until earned/billed. Disbursements (court filing fees, expert reports) may be GST-free or taxable per ATO rulings. Expense recoveries treated per the Goods and Services Tax Ruling GSTR 2000/37.

  • Childcare

    Childcare services GST-free under Division 38-145 if approved-services or registered-carer. CCS subsidy reconciliation creates BAS timing complexity. Materials and supplies (10% GST) claimable as input credits.

  • Education

    Most education courses GST-free under Division 38-85 (education courses) when delivered by registered training organisations or approved tertiary providers. Course materials may be partially taxable. International student fees typically GST-free under Division 38 export rules.

  • Manufacturing

    Manufacturing supplies generally 10% GST taxable. Exports GST-free under Division 38. Raw materials with GST claimable as input credits. Capital purchases (machinery, vehicles) GST claimable in the period acquired. Quarterly BAS most common; monthly required if turnover exceeds $20M.

  • Transport

    Road freight services 10% GST taxable. International freight (export and import legs) typically GST-free under Division 38. Fuel tax credits available — separate claim through BAS. TPAR mandatory for road freight services to businesses.

  • Mining

    Mining production 10% GST taxable; exports GST-free. Substantial fuel tax credits, R&D tax incentive offsets, and capital allowances flow through BAS. Native title and royalty payments have specific GST treatment per ATO mining-industry rulings.

  • Agriculture

    Most fresh food (bread, milk, fruit, vegetables, meat) GST-free under Division 38 Schedule 2. Processed/packaged food typically taxable. Fuel tax credits available for off-road farm machinery. Livestock sales GST-free between primary producers.

  • Fitness

    Fitness services 10% GST taxable. Membership fees GST applies. Equipment retail (apparel, supplements) taxable. Personal-trainer commissions to contractors may trigger TPAR if industry-wide reporting becomes mandatory.

  • Non-profit

    Charitable not-for-profits with GST registration: most fundraising events GST-free under Division 38 if non-commercial test passes. Gifts and donations not consideration — no GST. Government grants may or may not be consideration depending on conditions. NDIS supports GST-free under Division 38-38.

  • Events

    Event ticket sales 10% GST taxable. Bundled packages (ticket + food + accommodation) require apportionment per ATO events-industry guidance. Sponsorship income generally taxable. Door-takings reconciliation drives BAS-period accuracy.

  • Creative

    Creative services to AU clients 10% GST taxable. International commissions GST-free under Division 38 export rules. Royalty income taxable. TPAR may apply for security/courier/cleaning sub-contractors used in production.

  • Marketing

    Marketing services 10% GST taxable. Media spend pass-through (Google Ads, Meta Ads) — GST treatment depends on whether you re-bill or just facilitate. Overseas service exports GST-free under Division 38.

  • Human Resources

    HR consulting and recruitment services 10% GST taxable. Placement fee payments are taxable supplies. Background-check pass-through costs require apportionment if charged at-cost vs marked-up.

  • Insurance

    General insurance premiums INPUT-TAXED under Division 40 — no GST on the premium portion, but the policy holder may claim a decreasing adjustment. Life insurance premiums GST-free. Brokerage and intermediary services taxable at 10% GST.

  • Real Estate

    Residential rent INPUT-TAXED under Division 40 — no GST charged, no GST credits on related expenses. Commercial property rent generally 10% GST taxable. Sale of new residential premises taxable; existing residential GST-free under Division 38. Property management fees 10% GST taxable.

BAS deadlines + FTL penalties. Questions answered.

When is BAS due each quarter?+
Quarterly BAS deadlines: Q1 (Jul-Sep) due 28 October, Q2 (Oct-Dec) due 28 February, Q3 (Jan-Mar) due 28 April, Q4 (Apr-Jun) due 28 July. Lodging via the ATO Business Portal (https://bp.ato.gov.au) or via a registered tax agent grants a 4-week extension on Q1, Q3, and Q4 (no extension on Q2 due to the Christmas holiday calendar). Confirm current dates at https://www.ato.gov.au/business/business-activity-statements-(bas)/preparing-and-lodging-your-bas/due-dates-for-lodging-and-paying-your-bas/.
What's the difference between quarterly and monthly BAS lodgement?+
Quarterly is the default — you lodge a BAS every three months covering the prior quarter. Monthly is required if your annual turnover exceeds $20M, or if the ATO has placed you on monthly reporting due to past compliance issues. Monthly BAS is due 21 days after the end of each month. The trade-off: monthly lodgement spreads the cash-flow impact and gives faster GST refunds for net-credit businesses; quarterly lodgement reduces administrative burden but creates lumpy cash-flow on each lodgement.
Do I get an automatic extension if I lodge electronically?+
Yes for Q1, Q3, and Q4 — lodging via the ATO Business Portal or via a registered tax agent grants a 4-week extension on those three quarters. No extension on Q2 (October-December BAS due 28 February). The extension is automatic and does not require a separate application — simply lodge by the extended date and the extension applies. The tax agent extension dates are 25 November (Q1), 26 May (Q3), 25 August (Q4).
What is the Failure to Lodge (FTL) penalty?+
The FTL penalty applies when you do not lodge a BAS by its due date. Penalties scale with entity size and the number of 28-day periods overdue: small entities (turnover under $1M) accrue 1 penalty unit per 28-day period (max 5 per BAS), medium entities ($1M-$20M) accrue 2 units per period (max 10), large entities (above $20M) accrue 5 units per period (max 25). Penalty unit value is CPI-indexed — confirm the current value at https://www.ato.gov.au/general/interest-and-penalties/penalties/. The FTL penalty is in addition to any GIC (general interest charge) on overdue tax.
Can I get an FTL penalty remitted?+
Yes, if you have grounds. The ATO will consider remission of FTL penalties if you have a track record of compliance, the cause of the late lodgement was outside your control (illness, natural disaster, data loss, computer failure), or you took reasonable care but the lodgement was nonetheless late. Submit a remission request via the ATO Business Portal or via your tax agent. The ATO assesses each request on its merits; honesty about the cause is critical.
What happens if I owe GST and miss the BAS deadline?+
Two distinct consequences. (1) FTL penalty accrues per 28-day period overdue (per question above). (2) General Interest Charge (GIC) accrues on the unpaid GST amount itself, calculated daily at the published GIC rate (CPI-linked, currently around 11% per annum for FY2026 — confirm at ato.gov.au). GIC is not tax-deductible. The combined cost of late lodgement plus late payment compounds quickly. If cash flow is the constraint, contact the ATO BEFORE the deadline to discuss a payment plan — being upfront generally reduces the FTL exposure.
How does XIntelliSync prepare BAS to hit the deadline?+
XIntelliSync runs every transaction through XGVS at preparation stage — Division 38 / Division 40 / standard 10% GST classification, supplier ABN validation, GST credit eligibility, and label W1-G24 reconciliation. The platform tracks every BAS deadline against your business calendar and flags upcoming lodgements 14 days before the deadline. The PREPARE → DOWNLOAD → INSTRUCT → CONFIRM workflow ensures you have the lodgement file ready well before the deadline; you lodge externally via the ATO Business Portal at https://bp.ato.gov.au.

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BAS prepared 14 days before deadline. Every quarter.

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