BAS Labels Explained: G1, G10, G11, 1A and 1B

Introduction

The Business Activity Statement (BAS) is the primary reporting tool for GST in Australia. Understanding the key labels—G1, G10, G11, 1A, and 1B—is essential for accurate lodgment and avoiding penalties. This article explains each label in detail, provides practical examples, and offers reconciliation tips for sole traders, small business owners, and importers.

1. Understanding the BAS: Purpose and Structure

The BAS is used to report your GST obligations to the Australian Taxation Office (ATO). It captures total sales, purchases, and the resulting GST amounts. The labels are divided into two main sections: GST on sales (G1, 1A) and GST on purchases (G10, G11, 1B).

Key points:

• You must lodge a BAS monthly, quarterly, or annually depending on your GST turnover.
• Most businesses use the GST calculation worksheet to determine amounts for each label.
• Errors can lead to audits, penalties, and interest charges.

2. Label G1 – Total Sales (including GST)

G1 represents the total value of all sales made during the reporting period, including any GST. This includes:

• Taxable sales (both standard-rated and reduced-rate supplies)
• GST-free sales (e.g., basic food, medical services, education)
• Input-taxed sales (e.g., residential rent, financial supplies)
• Export sales (if GST-free)

Example: A café sells $10,000 of coffee (GST-inclusive) and $2,000 of GST-free fresh fruit. G1 = $12,000.

Expert Tip: Always include all sales, even if they are GST-free or input-taxed. The ATO uses G1 to verify your total business activity.

3. Label G10 – Capital Purchases

G10 captures the total value of capital purchases made during the period, including any GST. Capital purchases are assets with a useful life of more than 12 months, such as:

• Vehicles, machinery, and equipment
• Computers and office furniture
• Buildings (if used for a creditable purpose)

Example: A tradie buys a new ute for $55,000 (GST-inclusive). G10 = $55,000. The GST component ($5,000) will be claimed in 1B.

Warning: Do not include purchases of trading stock or consumables in G10—those go into G11.

4. Label G11 – Non-Capital Purchases

G11 covers all other purchases that are not capital assets. This includes:

• Trading stock (goods for resale)
• Raw materials and supplies
• Rent, utilities, and professional fees
• Repairs and maintenance

Example: A retailer buys $20,000 of inventory (GST-inclusive) and pays $1,100 for electricity (GST-inclusive). G11 = $21,100.

Note: If a purchase is partly for business and partly private, you must apportion the GST claim. Only the business-use portion goes into G11 (or G10).

5. Label 1A – GST on Sales

1A is the total GST you have collected (or are liable to collect) on your sales. It is calculated as:

1A = (G1 – GST-free sales – input-taxed sales) × 1/11

This formula works because GST is 1/11th of the GST-inclusive price for standard-rated supplies (10% GST).

Example: From the café example: G1 = $12,000, GST-free sales = $2,000. Taxable sales = $10,000. 1A = $10,000 × 1/11 = $909.09.

Important: If you use the GST calculation worksheet, you must separately record GST-free and input-taxed sales to correctly compute 1A.

6. Label 1B – GST on Purchases

1B is the total GST you can claim as input tax credits on your purchases. It is calculated as:

1B = (G10 + G11) × 1/11

However, you cannot claim GST on purchases that are:

• GST-free (e.g., basic food, exports)
• Input-taxed (e.g., residential rent, financial supplies)
• Private or non-business use

Example: From the tradie example: G10 = $55,000, G11 = $0. 1B = $55,000 × 1/11 = $5,000.

Expert Tip: Keep all tax invoices for purchases over $82.50 (GST-inclusive) to substantiate your 1B claims. The ATO may request them during an audit.

7. Reconciling G1, G10, G11 with 1A and 1B

Reconciliation ensures your BAS is accurate. The net GST payable (or refundable) is:

Net GST = 1A – 1B

If 1A > 1B, you owe the ATO. If 1B > 1A, you receive a refund.

Common reconciliation checks:

• Verify that G1 matches your total sales per your accounting system (including all streams).
• Ensure G10 and G11 sum to total purchases (excluding private items).
• Cross-check 1A and 1B against your GST collected and paid records.

8. Common Adjustments and Errors

Adjustments may be required for:

• Creditable purpose changes (e.g., asset used partly privately)
• Bad debts written off (you can claim back GST paid)
• Adjustments for price changes (e.g., discounts, returns)

Frequent errors:

• Including GST-free sales in the 1A calculation
• Claiming input tax credits on purchases without a valid tax invoice
• Mixing up G10 and G11 (capital vs. non-capital)

ATO Ruling: Refer to GSTR 2006/9 for detailed guidance on apportionment of input tax credits.

GST Calculator & Tools

Our GST Calculator Suite simplifies BAS preparation. Use the BAS Calculator to automatically compute G1, 1A, 1B, and net GST from your sales and purchase data.

Step-by-step guide:

1. Enter your total sales (GST-inclusive) in the “Total Sales” field.
2. Enter your GST-free and input-taxed sales separately.
3. Enter your total capital and non-capital purchases (GST-inclusive).
4. Click “Calculate” to see 1A, 1B, and net GST.

Use our GST Database to check the GST treatment of specific goods and services—ideal for importers and small businesses dealing with complex items.

Common GST Mistakes to Avoid

• Misclassifying purchases: Putting capital items in G11 or vice versa. Always check the asset’s useful life.
• Forgetting to adjust for private use: If you use a business asset partly for personal purposes, you must reduce your 1B claim proportionally.
• Not keeping tax invoices: The ATO requires invoices for purchases over $82.50 (GST-inclusive) to claim input tax credits.
• Including GST-free sales in 1A: Only taxable sales contribute to 1A. GST-free and input-taxed sales must be excluded.
• Lodging late: Late BAS lodgment attracts penalties. Set reminders or use our BAS calculator to prepare early.

Conclusion

Understanding BAS labels G1, G10, G11, 1A, and 1B is fundamental to accurate GST reporting. By correctly classifying sales and purchases, reconciling amounts, and using tools like our GST Calculator Suite, you can minimise errors and avoid ATO penalties. For complex situations, always consult a registered tax agent. Explore our GST Calculator and GST Database for further assistance.