Not tax advice. Computation tools only. Have a professional check your work before filing.
AU·Tax year 2025 · Filing 2026

Australia tax deadlines 2026.

Every individual and self-employed income tax deadline for Australia in 2026. Plus recurring VAT / GST / sales tax filings. Each deadline links to notes on how to file, what people miss, and matching open-source tax skills.

Annual deadlines

1 this year

Open-source skills for Australia

Prepare this return with open-source skills

These skills are in the OpenAccountants repo. Add them to your AI agent and they handle the computation.

australia-gst.mdAU

Use this skill whenever asked to prepare, review, or classify transactions for an Australian GST return (Business Activity Statement / BAS) for any client. Trigger on phrases like "prepare BAS", "do the GST", "fill in BAS", "create the return", "GST return", "Activity Statement", or any request involving Australian GST filing. Also trigger when classifying transactions for GST purposes from bank statements, invoices, or other source data. This skill covers Australia only and covers both Simpler BAS and full BAS reporting. GST groups, margin scheme, partial exemption complex, and going concern are all in the refusal catalogue. ALWAYS read this skill before touching any GST-related work.

australia-payroll.mdAU

Use this skill whenever asked about Australian payroll, PAYG withholding, superannuation guarantee, Single Touch Payroll, or employer obligations in Australia. Trigger on phrases like "PAYG", "pay as you go withholding", "superannuation", "super guarantee", "STP", "Single Touch Payroll", "STP Phase 2", "Medicare levy", "tax file number", "TFN declaration", "HECS-HELP", "STSL", "Fair Work", "NES", "national employment standards", "modern award", "payslip Australia", "ATO payroll", "BAS", "IAS", "activity statement", "annual leave", "long service leave", "minimum wage Australia", or any question about running payroll in Australia. ALWAYS read this skill before processing any Australian payroll work.

au-individual-return.mdAU

Use this skill whenever asked about Australian individual income tax for sole traders. Trigger on phrases like "how much tax do I pay in Australia", "Australian tax return", "sole trader tax", "ABN tax", "Medicare levy", "LITO", "PAYG", "tax brackets Australia", "BAS", "instant asset write-off", "home office deduction", "HELP repayment", "HECS debt", "small business income tax offset", "motor vehicle deduction", or any question about filing or computing income tax for an Australian sole trader. Covers 2024-25 Stage 3 tax rates, Medicare levy and surcharge, LITO, business income computation, allowable deductions, depreciation, instant asset write-off, small business income tax offset, HELP/HECS repayments, and final tax computation. ALWAYS read this skill before touching any Australian income tax work.

au-super-guarantee.mdAU

Use this skill whenever asked about Australian Superannuation Guarantee (SG) obligations, voluntary super contributions, concessional and non-concessional caps, Division 293 tax, government co-contribution, spouse contribution tax offset, carry-forward rules, or any question about super for sole traders or employers. Trigger on phrases like "how much super do I pay", "SG rate", "super guarantee", "concessional cap", "Division 293", "salary sacrifice super", "personal super contribution deduction", "co-contribution", "BPAY super", "ATO super clearing house", "super fund contribution", or any question about Australian superannuation. Also trigger when classifying bank statement transactions showing super fund payments, BPAY super debits, or ATO Small Business Super Clearing House (SBSCH) payments. ALWAYS read this skill before touching any SG-related work.

au-payg-instalments.mdAU

Use this skill whenever asked about Australian PAYG Instalments for sole traders. Trigger on phrases like "PAYG instalments", "BAS T1 T2 T7 T9", "instalment rate", "instalment amount", "ATO instalment", "GDP uplift", "GIC", "variation of instalments", or any question about income tax prepayments through the Business Activity Statement. Covers entry/exit thresholds, instalment rate method (T1/T2), instalment amount method (T7), GDP uplift factor, voluntary variation, GIC exposure on under-estimation, and quarterly/annual election. ALWAYS read this skill before touching any PAYG instalment work for Australia.

au-medicare-levy.mdAU

Use this skill whenever asked about the Australian Medicare Levy, Medicare Levy Surcharge (MLS), low-income reduction thresholds, family thresholds, surcharge tiers, private health insurance (PHI) rebate interaction, or Medicare levy exemptions. Trigger on phrases like "Medicare levy", "Medicare surcharge", "MLS", "do I pay Medicare levy", "low income Medicare", "Medicare levy reduction", "Medicare levy exemption", "private health insurance rebate", "PHI rebate", "M1", "M2", or any question about Medicare-related levies on an Australian tax return. ALWAYS read this skill before touching any Medicare levy work.

australia-formation.mdAU

Use this skill whenever asked about forming, incorporating, or registering a company in Australia. Trigger on phrases like "set up a company in Australia", "Pty Ltd", "ASIC registration", "Australian company formation", "register a business Australia", "ABN", "ACN", "proprietary limited", "sole trader Australia", "partnership Australia", or any question about starting a business entity in Australia. Covers entity types (Pty Ltd, Ltd, sole trader, partnership, trust), registration process, costs, post-formation compliance, and bank account opening. ALWAYS read this skill before advising on Australian company formation.

au-gst-bas.mdAU

Australian Business Activity Statement (BAS) — non-GST sections. Covers PAYG withholding (labels W1-W5), PAYG income tax instalments (labels T1-T9), FBT instalments (label F1), and PAYG withholding reconciliation. Complements australia-gst.md which covers GST labels (1A-9).

Preparing a Australia return?

The OpenAccountants repo has verified, open-source tax computation skills. Clone and run them with your AI agent, then get an accountant to review.