How to do your BAS statement at home

For many small business owners and sole traders, doing your own BAS (Business Activity Statement) at home is a practical option — provided you have the right guidance and tools. This article walks you through how to complete your BAS accurately, avoid penalties and stay compliant with the Australian Taxation Office (ATO).

What is a BAS?

A BAS is a form you lodge with the ATO to report and pay your tax obligations such as GST, PAYG instalments, PAYG withholding and other taxes. Australian Taxation Office+1 Even if you’re doing it yourself you must keep accurate records of sales, purchases, wages and other transactions. Watson and Watt

Step-by-step guide to completing your BAS from home

Gather your records – Ensure you’ve recorded all sales, purchases, expenses, wages and other relevant transactions for the reporting period. Accuracy here is key. Palladium Financial Group
Check your reporting period – Determine whether you lodge monthly, quarterly or annually depending on your turnover and ATO registration. business.gov.au
Calculate GST on sales and purchases – You need to report GST collected from customers and GST paid on business purchases. Australian Taxation Office
Include PAYG instalments & wages – If you have employees, you’ll need to report PAYG withholding. If you’re paying income tax in instalments you’ll report those too. Australian Taxation Office+1
Complete the BAS form – Log into the ATO’s Online services or use SBR (Standard Business Reporting) enabled software to complete the BAS. Australian Taxation Office+1
Review and lodge – Double-check all figures, ensure you’ve reported in whole dollars, and fill only the relevant fields. Australian Taxation Office
Pay any amount owing – If tax is payable, ensure payment is made by the due date to avoid penalties. Australian Taxation Office

Keep your records – Maintain your records for five years (or as required) in case the ATO audits or you need to correct figures later. Australian Taxation Office

Common mistakes to avoid

Leaving fields blank that apply to you or reporting using “N/A” or “nil” incorrectly. Australian Taxation Office
Failing to lodge on time — even if you owe nothing you must lodge a “nil” BAS. Australian Taxation Office
Mixing personal and business transactions, or missing purchases which reduce tax obligations.
Using outdated or incompatible software that does not integrate with the ATO.
Ignoring due dates, getting surprised by penalties or interest.

Tips for doing BAS at home smoothly

Use accounting software or cloud-based solutions to automate data capture and reduce manual work.
Regularly update your books — don’t leave everything to the last minute.
Set reminders in your calendar for your BAS lodgement date.
If your business grows or becomes more complex, consider engaging a BAS agent or accountant to review or lodge on your behalf.
Keep abreast of any regulatory changes from the ATO that might affect your obligations.

When to consider professional help

While doing your BAS at home is feasible for many small businesses and sole traders, professional support is beneficial when:

Your business has employees or complex payroll obligations.
You operate in multiple states or have multiple divisions.
You receive audits or review notices from the ATO.
You want to optimise your tax position, deductions and cash flow.