What is GST and VAT?

Value Added Tax (VAT) and Goods and Services Tax (GST) are indirect consumption taxes applied to the sale of goods and services. While terminology varies by country—Europe generally uses VAT, while countries like Australia, India, and Canada use GST—the underlying economic principle remains the same. The tax is collected incrementally at every stage of the supply chain, but the end consumer ultimately bears the cost.

Inclusive vs. Exclusive Tax Calculations

When running a business or managing invoices, you will often need to calculate tax in two different ways:

• Adding Tax (Exclusive): The price provided does not include tax. To find the final price, you calculate the tax amount and add it to the base price. (e.g., $100 + 10% GST = $110 Final Price).
• Removing Tax (Inclusive): The price provided already includes the tax. You need to extract the tax amount to find the original base price. You cannot simply subtract the tax percentage; you must use the formula: Base Price = Total Price / (1 + Tax Rate).

Why Accurate Tax Calculation is Critical

For business owners, making a mistake in VAT or GST calculations can lead to serious compliance issues, fines, and penalties from tax authorities. Furthermore, if you miscalculate inclusive tax, you might accidentally pay tax out of your own profit margins rather than passing it correctly to the consumer.