Can AI do my BAS or tax return in Australia?

Can ChatGPT or Claude do my BAS or tax return?

AI can do much of the groundwork: sort transactions, spot GST coding that looks wrong, compare this quarter with the last, and draft questions for your accountant. It can’t take responsibility for the result. You can prepare and lodge your own BAS or return, or pay a registered BAS or tax agent to. As at October 2026, the Tax Agent Services Act 2009 says only registered agents can charge for that work.

What AI can and can’t do with BAS and tax work, as at October 2026:

Task	Can AI help?	Who is responsible
Bank reconciliations and data entry	Yes	Whoever keeps your books (the TPB says these aren’t BAS services)
Coding transactions in Xero	Yes, as suggestions	You, or a bookkeeper working under a registered agent where GST judgement is needed
Working out GST and PAYG figures	Yes, drafts and checks	You, or a registered BAS or tax agent
Lodging the BAS	No	You, or a registered BAS or tax agent
Preparing and lodging an income tax return	Drafts and checklists only	You, or a registered tax agent
Tax advice you rely on	General explanations only	A registered tax agent

How does it change for a sole trader, a 2–10 person team and a 10–50 person business?

Size changes who checks the AI’s work, not whether someone must. A sole trader usually checks it themselves and lodges. A small team has a bookkeeper review it, with a registered agent for the GST calls and lodgement. A business of 10–50 has payroll, PAYG withholding and often a tax agent, so AI is best used to speed up month-end preparation and checks.

• Sole trader lodging your own BAS. Use AI as a second pair of eyes: ask it to compare this quarter with the last, list transactions coded GST-free that look taxable, or explain an ATO term. You lodge through ATO online services, and the figures are yours.
• 2–10 staff with a bookkeeper. AI takes the coding and reconciliation grunt work so your bookkeeper’s hours go on review. If you pay an outside bookkeeper for BAS work, check they’re a registered BAS agent on the TPB Register.
• 10–50 staff. Payroll, super, PAYG withholding and sometimes fringe benefits tax add complexity. AI fits month-end draft prep, variance checks and plain-English summaries for the owner, with a registered tax agent signing off.

Whatever your size, keep tax file numbers, payroll records and client financials out of consumer AI plans; our answer on using ChatGPT or Claude with confidential client data has the plan-by-plan rules.

What does On Autopilot charge for AI help with bookkeeping?

On Autopilot’s AI Bookkeeping Assist costs $1,500 to set up plus $399 a month (AUD, ex GST, month to month). It’s a Claude-based agent connected to your Xero that helps your existing bookkeeper: it suggests codes for uncoded transactions, prepares month-end drafts and runs BAS-ready checks for your bookkeeper or BAS agent. It never lodges, never confirms BAS figures and never gives tax advice.

What it does:

• Reads Xero with read-only access and suggests account codes that your bookkeeper accepts or changes. Every change in Xero is made by a person.
• Month-end draft prep: reconciliation status, uncoded and suspense items, and big movements against last month.
• BAS-ready checks: flags anything that looks unusual against prior quarters for your bookkeeper or BAS agent to look into.
• A plain-English monthly summary for the owner.

What it never does: lodge with the ATO, decide GST treatment, sign anything off, or give tax advice. Those stay with you and your registered agent. On Autopilot is a Melbourne-based AI consultancy and not a registered tax or BAS agent, which is why the line sits exactly there.

See AI Bookkeeping Assist, read how Claude connects to Xero, or book a free AI audit with Jenn Yang, our founder.

What does the law say about who can prepare and lodge BAS and tax returns?

The Tax Agent Services Act 2009 says you must not charge a fee for a tax agent service unless you’re a registered tax agent, and BAS services work the same way for BAS agents. A tax agent service means working out or advising on obligations or entitlements under a tax law, or dealing with the ATO for someone, where they’d reasonably rely on it. You can always prepare and lodge your own.

The Tax Practitioners Board’s examples draw the line clearly:

• Not BAS services: bank reconciliations, data entry that doesn’t involve interpreting a tax law, and coding invoices under the instruction and supervision of a registered agent.
• BAS services: coding transactions where that requires interpreting GST or other BAS rules, reconciling data to work out activity statement figures, and confirming or completing those figures for a client.
• Tax agent services: preparing or lodging returns, notices and statements about a client’s tax liabilities or entitlements.

The TPB warns of significant civil penalties for providing or advertising BAS services for a fee while unregistered. If anyone offers to prepare or lodge your BAS with AI for a fee, check them on the TPB Register first.

Who is responsible if AI gets my BAS wrong?

You are. Whoever or whatever prepares the figures, the business is responsible for what it lodges. A registered agent adds a protection an AI tool can’t: under the ATO’s safe harbour rules, if you give your registered agent all the relevant information and they fail to take reasonable care, you’re generally not liable for certain penalties for false or misleading statements or late lodgement.

So treat AI output as a draft. Check every figure against your Xero reports, never lodge straight from a chat window, and remember that what you pay a registered agent or bookkeeper is itself a deductible expense, as our answer on claiming AI tools and business costs at tax time explains.

Sources

• Tax Practitioners Board, Tax agent services (checked 03/10/2026)
• Tax Practitioners Board, BAS services (checked 03/10/2026)
• Tax Practitioners Board, Public Register (checked 03/10/2026)
• Federal Register of Legislation, Tax Agent Services Act 2009 (checked 03/10/2026)
• ATO, Safe harbour (checked 03/10/2026)
• ATO, Deductions for other operating expenses (checked 03/10/2026)