Indian GST invoice calculator reviewed for 2026. The menu includes 5%, 18%, 40% and special 3%, 1.5% and 0.25% rates; classification determines which applies. Intra-state GST splits into CGST and SGST/UTGST; inter-state supplies and imports use IGST. Compensation cess is nil from 1 February 2026. Separate excise duty and HSNS cess are outside this invoice estimate.

Formula

Exclusive GST = taxable value × rate. Inclusive value = (total − fixed historical cess) ÷ (1 + GST rate + historical cess rate). Eligible GST TDS = 2% of taxable value; eligible e-commerce TCS = 0.5% of net taxable supplies.

Examples

Inter-state standard invoice

₹10,000 taxable value at 18% produces IGST 1,800 and total 11,800, without CGST/SGST added again.

Eligible TCS settlement

A ₹10,000 invoice at 18% with eligible net taxable supplies of 8,000 gives TCS 40 and payment 11,760, before other deductions.

A PRACTICAL GUIDE

When to use this calculator

The Indian GST calculator separates the invoice tax components and supported TDS or TCS situations. It is useful for checking a price and understanding the difference between tax on the supply, amounts retained and the supplier's payment, without treating every percentage shown on an invoice as equivalent.

Information to prepare

Confirm the transaction date, applicable rate and intra-state or inter-state treatment. Check the conditions of GST TDS or e-commerce TCS before selecting them. Historical cess belongs only to the period and category for which it is provided and should not be added automatically to a current invoice.

How to interpret the result

The tax base is the value to which the selected transaction treatment applies. An inclusive total already contains tax and requires a reverse calculation to recover its net value. These amounts are not interchangeable. Tax charged on an invoice, tax withheld by a customer and eligible input-tax credit describe different obligations. Subtracting two amounts in a cash breakdown does not establish that they have the same legal treatment. Check what each output represents before using it in an invoice or budget.

A practical comparison

When reconciling the amount received, first review the invoice's tax base and component split, then the withholding or collection amount. A tax retained by another party does not necessarily reduce the supply's GST liability. Annual income taxation uses separate regimes and the income-tax calculator.

Check your calculation step by step

  1. Match the figures to the selected period and use INR for monetary inputs. If you start with a document in another currency or covering several periods, resolve that difference before entering a combined amount.
  2. Calculate the documented case first. Then change one input at a time to compare scenarios. Keep the original values available so a change in the result can be traced to a particular assumption rather than several simultaneous edits.
  3. Read the component breakdown alongside the formula and examples below. If an official document differs, check the date, base, rounding and omitted concepts before changing a rate or treating the difference as an error.

Continue with a related calculation

These tools cover other questions in India. Choose the one that matches the amount you want to check:

If you are comparing countries

Open the relevant jurisdiction when comparing a move, an offer or a transaction abroad. Each tool uses its own currency, period and scope; its result should not be substituted into the current calculation.

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Frequently asked questions

Which rate applies to my product?

Use its current HSN/SAC classification and notification. The menu is not an automatic product classifier. Specified tobacco and pan masala move to 40% and biris to 18% from February 2026; notified RSP-based valuation must be used where required.

Does every customer withhold 2% TDS?

No. The payer must be a specified deductor and the qualifying contract must exceed ₹250,000 excluding GST and cess. The section 51 place-of-supply exception is selectable. Domestic TDS/TCS is not applied to import assessments or zero-rated values.

What does the TCS amount represent?

The e-commerce operator collects 0.5% on eligible net taxable supplies. Enter the eligible value after returns and exclusions such as section 9(5) supplies. It is a payment settlement deduction, not additional GST on the invoice.

Can I calculate older invoices?

The menu starts with the September 2025 rate reform. Earlier dates are rejected. Historical cess for dates before February 2026 must be selected from the notification for that supply; it is not carried into current invoices.

CHECK THE REFERENCES

Official sources