Invoice Calculator
Calculate invoice subtotal, tax and total from line items.
An invoice calculator helps businesses quickly compute invoice totals including line items, discounts, GST at different rates, and TDS deductions. Getting invoice calculations right is critical for GST compliance — errors in tax calculation lead to mismatches in GSTR filings and potential notices. This calculator handles multi-item invoices with mixed GST rates, applies discounts correctly (before GST, not after), and shows the CGST/SGST or IGST split based on whether the transaction is intra-state or inter-state.
📋 How to Use This Calculator
Add line items with quantity, unit price, and applicable GST rate (0%, 5%, 12%, 18%, or 28%). Apply any pre-GST discounts. Select whether this is an intra-state transaction (CGST + SGST) or inter-state (IGST). Optionally add TDS if applicable. The calculator generates a complete invoice summary with taxable value, GST breakup, TDS deduction, and final payable amount.
💡 Key Facts & Information
Indian GST invoice requirements: GSTIN of supplier and recipient (if registered), invoice number, date, HSN/SAC code, taxable value, GST rate and amount (split into CGST/SGST for intra-state or IGST for inter-state), total invoice value. Discount treatment: discounts must be deducted before GST calculation if they are known at time of supply and mentioned on invoice. Post-supply discounts require credit notes. Common GST rates: food items 0–5%, textiles 5–12%, services 18%, luxury goods 28%. E-invoicing mandatory for businesses with turnover above ₹5 crore. Invoice value threshold for B2C: ₹2.5 lakh — above this, QR code mandatory.