GST & Business
Quick answer: The FinTax24 GST Invoice Value Calculator computes the taxable value and total invoice value for supplies involving multiple GST rates, discounts, GST-inclusive pricing, reverse-charge and TDS sections in a single expression. Useful for retailers, distributors, e-commerce sellers and SaaS / IT services billing teams preparing bulk invoices.
Generate GST-inclusive invoice amounts.
Follow these 4 steps for an accurate result.
Type each line of supply with its base price and applicable GST rate.
Pre-tax discounts reduce taxable value; post-tax discounts do not. Choose the right type.
Pick intra-State, inter-State, reverse-charge, RCM or composite supply treatment.
Calculator outputs base value, CGST / SGST / IGST, total invoice value and TDS / TCS if any.
Quick answers to common questions about gst invoice calculator.
Pre-tax discounts (allowed before GST computation) reduce the taxable value as per Section 15(3). Post-tax discounts (offered on the GST-inclusive amount) must be allocated across all GST rates proportionately, as per Circular 140/10/2020-GST. The calculator handles both via the discount toggle.
Yes — Section 31 mandates a tax invoice for every taxable supply by a registered person, with serial-number continuity. For B2C supplies not exceeding ₹200 per invoice, a consolidated invoice may be issued at end-of-day. Reverse-charge supplies still require invoice on receipt.
A valid GST invoice should carry supplier GSTIN, billing / shipping address, invoice number, date, HSN/SAC code, description, quantity, unit price, GST rate, CGST / SGST / IGST value, and total value. QR code is required for invoices above ₹500 from B2C suppliers.
For reverse-charge supplies, the recipient (not the supplier) issues the invoice on receipt of goods / services, on behalf of the supplier. The recipient also issues a payment voucher and pays tax in cash. Use this calculator in RCM mode to compute line-by-line.
TDS under Section 194-IA (1% on property transfer above ₹50 lakh) is over and above GST invoicing. For e-commerce supplies, TCS at 1% (Section 52) is collected by the operator. The calculator applies TDS / TCS only if your transaction type falls under these sections.
Debit notes are issued when the taxable value or tax goes up post-invoice, and credit notes when it comes down (returns, discounts). Both must be recorded in the supplier's return for the period in which they are issued under Section 34 of the CGST Act.
Key sources: CGST Section 15 — value of supply, CGST Section 31 — tax invoice, CBIC circulars on discounts.
Reviewed by FinTax24 Content Team · Review date
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