Bookkeeper vs BAS Agent vs Accountant: Which Does a Small Business Need?

The three roles, and the line the law draws

Role	Does	Registration required?	Typical cadence
Bookkeeper	Records transactions, reconciles bank feeds, maintains the ledger, runs accounts payable and receivable, often payroll	None to keep books; BAS services for a fee require registration	Weekly or fortnightly
BAS agent	Prepares and lodges activity statements and advises on GST, PAYG and related obligations	Yes: Tax Practitioners Board (Tax Practitioners Board, public register)	Monthly or quarterly
Accountant / tax agent	Income tax return, financial statements, structure and tax advice, year-end	Yes for tax agent services: Tax Practitioners Board	Annually, plus advice as needed

The line that matters is registration. Anyone can call themselves a bookkeeper; only a registered BAS or tax agent may provide BAS services for a fee under the Tax Agent Services Act 2009. A bookkeeper who also lodges your BAS is either registered, working under a registered agent's supervision, or breaking the law.

Which one do you need?

Under the GST registration threshold of $75,000 (ATO, Registering for GST) with no staff, many businesses need a bookkeeper's discipline and an accountant at year end, and nothing else. Once GST applies, the quarterly statement needs a registered agent or your own careful lodgment. Once there are employees, the job changes shape: Single Touch Payroll reporting every pay (ATO, Single Touch Payroll), super with each pay from 1 July 2026 (ATO, Payday Super for employers), and award rates that move every 1 July. At that point the question stops being which role and becomes who holds the whole picture.

The handover problem

Three separate providers means three handovers a quarter: the bookkeeper closes the period, the BAS agent lodges from it, the accountant adjusts at year end, and each one finds the previous one's loose ends. The owner relays between them. That relay is the coordination tax, and it is the strongest argument for the three functions sitting in one team, with a registered BAS agent inside it, while the external accountant keeps the return and the advice.

Questions that sort the good from the loose

Ask a bookkeeper how often they reconcile and who reviews their work. Ask a BAS agent for their registration and who signs off before lodgment. Ask an accountant whether they want reconciled books at year end or expect to rebuild them. The answers tell you whether you are buying a function or a person.