How to Lodge Your Own BAS Through ATO Online Services
Registrum Team 1 May 2026 5 min read Reviewed 21 May 2026
BAS
GST
ATO
Compliance
You can lodge your own Business Activity Statement (BAS) through ATO Online Services, as long as you're preparing it for your own business. If a third party prepares or lodges BAS for you for a fee, they must be a registered BAS or tax agent under the Tax Agent Services Act 2009 (Cth).
1. Get your figures right
Reconcile your bank accounts to your accounting software. Make sure GST on income (G1) and GST on expenses (G11) are accurate. PAYG withholding (W1, W2) should match your payroll records.
2. Log in to ATO Online Services
Use your myID (formerly myGovID) linked to your business through Relationship Authorisation Manager (RAM). From your business portal, navigate to Activity Statements.
3. Enter the figures
Fill in G1 (total sales), 1A (GST on sales), 1B (GST on purchases), W1 and W2. Most accounting software (including Registrum) prepares these labels exactly so you can copy them across.
4. Lodge and pay
Review, lodge, and pay via BPAY or direct debit before the due date. Quarterly BAS is generally due on the 28th day of the month following each quarter (with extensions in some quarters — check the ATO website for current dates).
Common mistakes
Double-counting GST on capital purchases (G10), forgetting to report GST-free sales (G3), or missing PAYG instalments. Good record-keeping and software automation reduce most of these risks.
Disclaimer: General information only — not tax, legal or financial advice. BAS lodgement obligations vary by business. Consult a registered tax/BAS agent for your situation.