How to Use the GST & VAT Calculator
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1
Enter the base initial amount (Net or Gross price).
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2
Select a Tax Rate slab (5%, 12%, 18%, 28%) or type a custom percentage.
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3
Choose Calculation Mode: "Add GST/VAT (Exclusive)" or "Remove GST/VAT (Inclusive)".
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4
Review instant itemized breakdown: Net Amount, GST/VAT Amount, and Gross Total.
Practical Example & Use Case
Common Real-World Scenario
Calculating 18% GST on a $1,500 consulting service invoice or determining the pre-tax base cost of a $99 tax-inclusive store receipt.
Technical Notes & Limitations
Browser Engine Architecture
Calculations use decimal precision rounding to 2 fractional places for standard currency representation.
Frequently Asked Questions
What is the difference between GST inclusive and exclusive?
GST exclusive means tax is added on top of the base price. GST inclusive means the entered price already contains the tax component.
Can I use this for international VAT or sales tax?
Yes, just input your country rate percentage (e.g. 20% UK VAT, 10% Australia GST, or 7% US sales tax).