Can a contractor use the Invoice basis?

Yes, but it's risky. You'd be liable for GST as soon as you hit 'send' on an invoice, regardless of when the client pays you.

Verified for 2026 Tax Year

Retail vs. Contractor GST

Q: How does GST handle stock-takes?

For retailers, a stock-take doesn't usually affect your GST (which is driven by transactions), but it is critical for your Income Tax (end-of-year accounts).

A practical 2026 case study. How thousands of small retail sales compare to high-value project payments when it comes to GST compliance.

The 10-Second Rule

Retailers manage high volume and inventory, making the **Invoice Basis** ideal for claiming back GST on stock early. Contractors deal with high-value invoices and slow payers, making the **Payments Basis** essential for protecting cash flow.

Model Comparison

🏪

The Retailer

High Vol / Low Value

INVOICE BASIS

💻

The Contractor

Low Vol / High Value

PAYMENTS BASIS

1. Why the Basis Choice Matters

The "Accounting Basis" determines *when* you owe GST to the IRD. For a shop, you want to claim back GST as soon as you buy stock. For a contractor, you want to avoid paying GST until the client actually pays you.

RETAIL LOGIC

Buying $2,000 of stock on credit? Under **Invoice Basis**, you claim the $260 GST refund today, even if you pay the supplier next month.

CONTRACTOR LOGIC

Invoicing $50k in Jan but paid in March? Under **Payments Basis**, you don't owe the $7,500 GST until the cash is in your bank.

2. Feature Comparison

Feature	Retail (Shop)	Contractor
Primary Claims	Inventory & Supplies	Subs & Home Office
Transaction Vol.	Thousands / mo	1–5 / mo
Vehicle Rules	Vans (100% claim)	Cars (Logbook %)

Mixed-Use Risks

For contractors, the IRD heavily scrutinizes **Home Office** and **Vehicle** claims. If you claim 50% GST on a car but your logbook only proves 20% business use, you face back-dated penalties. Retailers face similar risks with "Stock for Personal Use" (e.g., taking milk from the shop for home).

3. Shop Fit-outs vs. Home Tech

Large business purchases lead to massive GST refunds. Documentation is key.

🔨

The Retailer: An $80,000 shop renovation generates a **$10,434** GST refund. You must have valid Tax Invoices from all tradies to claim this.

💻

The Contractor: A $5,000 high-end workstation generates a **$652** refund. If you game on it 50% of the time, you must adjust your claim accordingly.

Case Study FAQ

What is the "Hybrid" accounting basis?

It's a mix: You use the Invoice basis for sales and the Payments basis for expenses. It's rare but sometimes useful for businesses with very slow-paying creditors.

How does GST handle stock-takes?

A stock-take doesn't affect your GST (which is driven by transaction dates), but it is critical for your Income Tax and COGS calculations at year-end.

Explore More