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Reverse GST Calculator

Enter a GST-inclusive price and the GST rate to get the price before GST and the GST amount. Switch to “Add GST” to go from a net price to the inclusive total.

%

Common rates as a starting point. Rates change and some goods carry reduced rates, so confirm yours with your tax authority.

Price before GST
—
Before taxGST
Price before GST—
+ GST—
Total price with GST—
Solution, step by step
    Several amounts? Split a whole list at the same rate, for example a month of receipts.
    Price incl. taxBefore taxGST
    Total——
    The formula

    How to remove GST from a GST-inclusive price

    Reverse GST, also called GST back calculation, finds the taxable value and the GST inside an inclusive price.

    Remove GST (reverse)Price before tax = Total ÷ (1 + rate)
    GST = Total − Price before tax
    Add GSTGST = Price × rate
    Total = Price × (1 + rate)

    GST is charged on the taxable value, so an inclusive price is taxable value × (1 + rate). To remove GST you divide: at 18% divide by 1.18, at 10% divide by 1.1, at 5% divide by 1.05.

    Subtracting the rate from the total gives the wrong answer. 18% of 11,800 is 2,124, but the GST charged was 1,800.

    Quick reference

    Divide-by table: remove GST at common rates

    To take GST out of a tax-inclusive price, divide by the figure in the second column. To find the GST inside the total, multiply by the third.

    GST ratePrice before tax = total ÷GST = total ×Example: 1,000 incl. tax
    3%1.030.029126970.87 + 29.13
    5%1.050.047619952.38 + 47.62
    9%1.090.082569917.43 + 82.57
    10%1.10.090909909.09 + 90.91
    12%1.120.107143892.86 + 107.14
    15%1.150.130435869.57 + 130.43
    17%1.170.145299854.70 + 145.30
    18%1.180.152542847.46 + 152.54
    28%1.280.21875781.25 + 218.75
    40%1.40.285714714.29 + 285.71
    Worked examples

    Reverse GST examples

    Tap an example to load it into the calculator.

    ₹11,800 including 18% GST. What is the taxable value?
    11,800 ÷ 1.18 = 10,000.00
    GST = 1,800.00
    Load in calculator →
    A$110 including 10% GST. How much is GST?
    110 ÷ 1.1 = 100.00
    GST = 10.00
    Load in calculator →
    Rs 5,900 including 18% sales tax (GST) in Pakistan.
    5,900 ÷ 1.18 = 5,000.00
    GST = 900.00
    Load in calculator →
    How to

    How to calculate GST from a total, by hand

    Turn the GST rate into a decimal. 18% ÷ 100 = 0.18.
    Add 1. 1 + 0.18 = 1.18.
    Divide the inclusive price. 11,800 ÷ 1.18 = 10,000, the price before GST.
    Subtract to get GST. 11,800 − 10,000 = 1,800. In India, for an intra-state sale, that is 900 CGST + 900 SGST.

    Stop working tax out by hand

    In EloERP each tax rate is set once as inclusive or exclusive. Every POS sale and invoice then splits the price into the amount before tax and the tax itself, and posts the tax to its own ledger account. In Pakistan, Saudi Arabia, Malaysia, the UAE and Lesotho it also files the invoice with the tax authority.

    Start 15-Day Free TrialBook a demo
    • Tax-inclusive or exclusive prices per tax rate
    • Tax split on every receipt and invoice
    • Tax posted to its own ledger account
    • E-invoicing for FBR, ZATCA, MyInvois, UAE and Lekuka
    FAQ

    GST calculator: questions

    How do I calculate GST from a GST-inclusive amount?
    Divide the inclusive amount by 1 plus the GST rate. At 18%, divide by 1.18: 11,800 ÷ 1.18 = 10,000 before GST, and the GST is 11,800 − 10,000 = 1,800.
    What is the reverse GST formula?
    Price before GST = GST-inclusive price ÷ (1 + GST rate ÷ 100). GST amount = inclusive price − price before GST, or inclusive price × rate ÷ (100 + rate).
    How do I remove 10% GST from a price?
    Divide by 1.1, or take one-eleventh of the total as the GST. For a price of 110, the price before GST is 100 and the GST is 10.
    What is GST back calculation?
    It is the same reverse calculation: starting from a GST-inclusive price and working back to the taxable value and the GST inside it, as you need when a supplier quotes an inclusive price.
    How do I calculate GST exclusive to inclusive?
    Switch the calculator to “Add GST” and enter the price before GST. It multiplies by 1 plus the rate: 10,000 at 18% becomes 11,800.
    Does it split CGST and SGST?
    It gives the total GST. For an intra-state sale in India split it in half for CGST and SGST (18% GST is 9% + 9%). For an inter-state sale the whole amount is IGST.
    Is this GST calculator free?
    Yes. It runs in your browser, needs no sign-up and sends nothing anywhere.
    More free tools

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