AixKit
All-in-One Online Calculators
AixKit
All-in-One Online Calculators
Part of: Finance & Tax →
Goods and Services Tax (GST) is an indirect tax levied on the supply of goods and services. It replaces multiple older taxes such as VAT, service tax, and excise duty and is applied at each stage of the supply chain. GST is widely used in countries including India, Australia, New Zealand, Canada, and Singapore.
Calculate GST-inclusive and GST-exclusive prices instantly using standard tax formulas.
Whether you are a business owner issuing invoices, a retailer setting product prices, a consumer checking a receipt, or a freelancer calculating billing amounts, this calculator handles the maths in seconds — no manual calculation needed.
GST Amount = Base Amount × GST Rate ÷ 100
Total Price = Base Amount + GST Amount
Original Amount = Total Price ÷ (1 + GST Rate ÷ 100)
GST Amount = Total Price − Original Amount
This calculator uses standard GST formulas used in real-world invoicing and accounting.
For quick percentage calculations on any figures, the Percentage Calculator is a useful companion.
Base Amount: $1,000 | GST Rate: 18%
GST Amount = 1,000 × 18 ÷ 100 = $180
Total Price = 1,000 + 180 = $1,180
Total Price: $1,180 | GST Rate: 18%
Original Amount = 1,180 ÷ (1 + 0.18) = $1,000
GST Amount = 1,180 − 1,000 = $180
Use the "GST Excluded" mode in the calculator above to add GST, or "GST Included" to remove it from a total.
Understanding this distinction is essential for accurate invoicing and pricing.
The price does not include GST. Tax is added on top when the final invoice or receipt is issued. This is the base amount before any tax is applied. Most business-to-business (B2B) quotes are GST exclusive so the buyer knows the net cost and the tax separately.
The price already includes GST. The total you see is what the buyer pays — the tax is embedded in the figure. Most consumer retail prices are GST inclusive, so customers see the final amount immediately.
This calculator handles both clearly — choose the mode that matches your situation.
For related tax calculations, see the Sales Tax Calculator or the VAT Calculator.
GST and VAT are both consumption-based indirect taxes, but they differ in structure, terminology, and implementation across countries.
Every GST-registered business must display the GST amount separately on invoices. Accurate GST calculation ensures the invoice is legally compliant and the correct tax is collected from the buyer.
Online stores must display GST-inclusive prices to consumers in most jurisdictions. Calculating the exact GST portion upfront prevents undercharging or overcharging at checkout.
Retailers set shelf prices that are GST inclusive in many countries. Knowing how much of the price is tax helps with margin calculations and compliance reporting.
Businesses must report total GST collected and GST paid on purchases when filing periodic returns. Accurate per-transaction GST figures are essential for correct net GST liability calculation.
For broader financial planning, the Interest Calculator and Loan Calculator complement GST calculations for complete business finance analysis.
A small error in GST rate or calculation method leads to incorrect pricing — either undercharging (losing revenue) or overcharging (creating a compliance liability). Calculating correctly every time protects your margins and your business reputation.
Applying the wrong rate or confusing inclusive and exclusive pricing are among the most common GST errors. This calculator eliminates both risks by clearly labelling the mode and showing the full breakdown.
Tax authorities require businesses to collect and remit the exact GST amount. Systematic errors — even small ones — can result in penalties, interest charges, or audits. Accurate calculation at the point of transaction is the first line of compliance.
Clients and customers expect invoices that clearly show the pre-tax amount and the tax separately. Transparent GST billing builds trust and reduces disputes over quoted vs final prices.
The GST rate directly determines how much tax is added to any transaction. Understanding the impact of different rates helps businesses set correct prices and consumers evaluate total costs.
Always verify the applicable rate for your specific product or service category in your country or region before issuing invoices.
Try different GST rates and amounts above to see instant results and compare your pricing scenarios.
For business pricing decisions, combine this with the Profit Margin Calculator to check your margin after accounting for GST, or the Selling Price Calculator to set a final price inclusive of tax.