GST Calculator with Input Tax Credit for Ecommerce
A free GST calculator with input tax credit for ecommerce: forward and reverse GST, CGST + SGST or IGST splits, and net tax payable after ITC offsets.
GST Invoice Calculator
Inclusive / Exclusive Tax Breakdown
Input Tax Credit (ITC) Calculator
Tax Liability Offset & Carryforward Balance
Tax collected from buyers that is payable to government.
How to use the GST and ITC calculator
This free GST calculator works out the tax on a sale in both directions: add GST on top of a base price (exclusive) or extract the GST already included in a price (inclusive). It splits the tax into CGST and SGST for sales within your state, or shows it as IGST for inter-state sales.
The second panel is an input tax credit (ITC) calculator: enter the GST you collected on sales and the GST you paid on purchases to see how much ITC offsets your liability, what you still owe in cash, and any credit carried forward.
It works for any marketplace. For example, it doubles as an Amazon seller GST calculator: enter the GST-inclusive selling price to see the taxable value and the tax inside it.
Step by step
- 1Choose Exclusive (GST added on top) or Inclusive (GST already inside the price).
- 2Enter the amount and pick a rate — 0%, 5%, 18% or 40% — or type a custom rate (for example 3% or an older 12%/28% invoice).
- 3Select CGST + SGST (intra-state) or IGST (inter-state) to see the split.
- 4Copy the breakdown, or use the ITC panel to offset input tax against output tax.
How the GST and ecommerce ITC (input tax credit) calculation works
- Exclusive: GST = amount × rate ÷ 100, and invoice value = amount + GST.
- Inclusive: taxable value = amount × 100 ÷ (100 + rate), and GST = amount − taxable value.
- Intra-state sales split the GST equally into CGST and SGST; inter-state sales carry the full amount as IGST.
- All amounts are rounded to two decimals. Nothing you type leaves your browser.
Frequently asked questions
What is the difference between inclusive and exclusive GST?
Exclusive means GST is added on top of your price. Inclusive means the price you entered already contains GST, so the calculator works backwards to the taxable value and the tax inside it.
Can I use it as a reverse GST calculator online for India?
Yes. Choose Inclusive and enter the GST-inclusive price, such as a marketplace listing price. The calculator works backwards to the taxable value and shows the GST inside it, split into CGST + SGST or IGST.
When do I charge IGST instead of CGST and SGST?
IGST applies when the place of supply is in a different state from your registration. Within the same state, the same total GST is split equally between CGST and SGST.
Is this calculator a substitute for my GST return?
No. It gives quick, accurate arithmetic for day-to-day pricing. File returns using your books and the GST portal, and check unusual cases with your tax adviser.
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