What it means
GST is a form of value added tax, meaning it taxes the value added at each stage of production and sale rather than the full selling price repeatedly. A manufacturer charges GST on its sale to a wholesaler, the wholesaler charges GST on its sale to a retailer and so on.
At each stage, the business deducts the GST it paid to suppliers, so only the tax on its own added value is passed to the authority. Countries such as Canada, Australia, India, Singapore and New Zealand use GST under that name, while many others call the same type of tax VAT.
Rates, exemptions and rules are set by each government and are changed from time to time, so a business should always check the current rules with the tax authority. Some goods, such as basic food or medical services, are often taxed at a lower rate or not at all.
For a business, the key skill is separating GST from revenue and cost. GST collected on sales is not income, and GST paid on purchases is not an expense, because both pass through to the tax authority.
The difference is a balance owed or refundable, and it is usually settled by filing a return each month or quarter. Registration thresholds mean small businesses may not have to charge GST until their sales pass a set level.
Once registered, a business must show GST on invoices, keep records and file returns on time. Late filing or incorrect claims can lead to penalties, so many companies assign a named person to oversee the process.
GST also affects pricing and cash flow. A business that quotes prices without GST needs to say so clearly, or customers may assume the tax is included and dispute the extra amount.
A business that sells on credit must pay the GST to the authority even before the customer has paid, which can create a cash gap. The nuance is that businesses making exempt supplies, such as some financial or educational services, cannot usually reclaim the GST on their costs.
That unrecoverable tax then becomes a genuine cost and must be built into pricing.
In practice
Real-world examples
Example 1
A consultancy invoices a client $5,000 plus GST at 10%, so the client pays $5,500. The consultancy keeps $5,000 as revenue and holds the $500 until it files its return.
Example 2
A cafe buys $3,000 of ingredients and equipment and pays $300 GST on them. When it files its quarterly return, it subtracts that $300 from the GST it collected on meals, which lowers the payment due.
Example 3
A small designer's sales are below the registration threshold and she is not registered. She does not charge GST to clients, but she also cannot claim back the GST she pays on her laptop and software.
Think of it
Imagine a relay race where a baton is passed along. Every runner carries a small extra weight, but drops it off at the final station, leaving only the ultimate receiver to cross the finish line carrying the full weight.
Formula
Calculation
GST payable = GST collected on sales - GST paid on purchases
Suppose a retailer sells goods for $200,000 before tax in a quarter and the GST rate is 10%, so GST collected is 200,000 x 0.10 = $20,000. In the same quarter it buys stock and supplies of $120,000 before tax, paying GST of 120,000 x 0.10 = $12,000. GST payable to the tax authority is 20,000 - 12,000 = $8,000. The rate of 10% is used here only as a round figure for illustration.Case study
Seen in the real world
Sunrise Print Studio is an illustrative, fictional printing company that grew quickly and crossed its registration threshold without noticing. For almost a year it issued invoices without GST, and its bookkeeper treated all receipts as revenue.
When the owner realised, the company had to pay GST on the sales from its own funds, because it could not now collect the tax from customers who had already paid. The bill was $38,000, which wiped out the profit for the period.
The illustrative lesson is that GST registration is triggered by turnover, not by choice, and a monthly check of sales against the threshold would have prevented the problem.
Watch out
Common mistakes
- Counting GST collected as revenue, which overstates income and leaves the business short when the tax is due.
- Failing to register once sales pass the threshold, which can leave the business paying the tax out of its own pocket.
- Claiming GST back on costs without a valid tax invoice, which can lead to the claim being rejected and penalties applied.
Questions
People also ask
Is GST the same as VAT?
They are the same type of tax, a consumption tax on value added, with different names in different countries.
Who really pays GST?
The final consumer bears it, while businesses collect it and pass it on after deducting the GST on their own purchases.
Can a business reclaim GST on all its purchases?
Usually only on purchases used to make taxable supplies, and not on items such as private spending or on costs linked to exempt sales.