Reverse GST Calculator
Calculate original price and GST amount from a total value. Use our free reverse gst calculator for 5%, 12%, 18%, and 28% rates.
Reverse GST/VAT Calculator
Extract the original pre-tax price and tax amount from a GST/VAT-inclusive price with multiple rate support.
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Quick Rates:
ORIGINAL PRICE (BEFORE TAX)
$1,000.00
Base = $1,180.00 ÷ 1.18TAX AMOUNT (GST)$180.00
TAX AS % OF BASE18.0%
TAX AS % OF TOTAL15.3%
Reverse Formula
Base Price = Total ÷ (1 + Rate/100) = 1180 ÷ 1.18 = 1000.00
How to Use Reverse GST Calculator in 3 Easy Steps
1
Step 1
Input the final total price that includes the GST tax.
2
Step 2
Select the applicable GST percentage (5%, 12%, 18%, 28%) or enter a custom rate.
3
Step 3
Click 'Reverse Calculate' to perform the math.
Frequently Asked Questions
It's primarily used to find the base price of a product when only the final price (inclusive of tax) is known. This is crucial for filing GST returns and claiming Input Tax Credits (ITC).
Yes! While we provide quick buttons for standard rates like 5%, 12%, 18%, and 28%, you can also enter a custom percentage in our calculator.
Yes. Standard GST is calculated as 'Base Price x (Rate/100)'. Reverse GST is calculated as 'Total / (1 + Rate/100)' to account for the fact that the tax is already added to the base.
Absolutely. Although branded as a reverse gst calculator, the math is identical for VAT (Value Added Tax) or any other inclusive sales tax system.
Using an online tool ensures you don't make rounding errors or formula mistakes, which can lead to discrepancies in your accounting or tax filings.