What is Simpler BAS?
Simpler BAS is the default GST reporting method for small businesses with a GST turnover under A$10 million. Introduced 1 July 2017, it cut the BAS from 7 GST questions down to 3 — total sales (G1), GST on sales (1A), GST on purchases (1B).
It is not the same as the UK Flat Rate Scheme. You still calculate GST in the normal way (1/11 of GST-inclusive sales); Simpler BAS just removes the requirement to classify each transaction by GST type on the form.
Who is eligible?
- GST turnover under A$10 million (projected or actual)
- Auto-enrolled by the ATO unless you opt for full reporting
- Not available for taxi operators (special rules), or businesses with input-taxed financial supplies that need full reporting
The three Simpler BAS labels
G1
Total sales
All sales including GST. Tick the "G1 includes GST" box on the BAS.
1A
GST on sales
G1 ÷ 11 (the GST component of taxable sales).
1B
GST on purchases
Total GST-bearing purchases ÷ 11. Only count purchases with valid tax invoices.
Worked Example
Quarter Q1: Total sales (G1) = $77,000. Total purchases with GST = $22,000.
1A (GST on sales): $77,000 ÷ 11 = $7,000
1B (GST on purchases): $22,000 ÷ 11 = $2,000
Net BAS payable: $7,000 − $2,000 = $5,000 due by the BAS deadline.
When is the BAS due?
- Quarterly: 28 October, 28 February, 28 April, 28 July
- Monthly: 21st of the following month
- Annual: 31 October (with your tax return)
Lodging through a registered tax/BAS agent gives you extensions of around 4 weeks (no extension applies to the February quarter).
Cash vs accruals
Simpler BAS works with both methods. Cash reports GST when invoices are paid — better for cash flow and available if your turnover is under $10m. Accruals reports GST when invoices are issued. You choose the method when you register for GST and can change it later through Online Services for Business.