📊 BAS Helper
Calculate your BAS figures for quarterly lodgement. Select your quarter and enter GST-inclusive amounts.
📅 Q1 — Jul–Sep (July, August, September) — Due: 28 October
GST Section
PAYG Withholding (Optional)
How to Fill In Your BAS
The Business Activity Statement (BAS) is lodged with the ATO either monthly or quarterly:
- G1 (Total Sales): All income your business received, including GST
- G2 (Export Sales): Sales to overseas customers (GST-free)
- G3 (GST-Free Sales): Domestic sales that are GST-free (e.g., basic food, health)
- G11 (Non-capital purchases): Business purchases eligible for GST credits
- 1A (GST on Sales): = (G1 - G2 - G3) ÷ 11
- 1B (GST on Purchases): = G11 ÷ 11 (this is your credit)
- W1/W2: Wages and PAYG withholding if you have employees
BAS Lodgement Due Dates
| Quarter | Period | Due Date |
|---|---|---|
| Q1 — Jul–Sep | July, August, September | 28 October |
| Q2 — Oct–Dec | October, November, December | 28 February |
| Q3 — Jan–Mar | January, February, March | 28 April |
| Q4 — Apr–Jun | April, May, June | 28 July |
If you lodge through a registered tax agent, you may be eligible for extended due dates.