A GST invoice is more than a bill. Your customer may use it to claim input tax credit, and you use it as the record of a sale. Getting the details right the first time saves a lot of back and forth.
The details a tax invoice usually carries
- Your business name, address and GSTIN.
- A unique invoice number and the invoice date.
- Your customer’s name and address, and their GSTIN if they are registered.
- A description of each item or service, with its HSN code for goods or SAC code for services.
- Quantity, unit and the taxable value of each line.
- The tax rate and the tax amount, shown as CGST and SGST for sales within a state, or IGST for sales between states.
- The place of supply, which decides which of those taxes applies.
- The total amount in figures and in words, and an authorised signature or digital signature.
Common mistakes to avoid
- Skipping or mistyping the customer’s GSTIN, which blocks their credit.
- Using the wrong tax split, for example CGST and SGST on an interstate sale.
- Reusing or skipping invoice numbers, which makes your records hard to reconcile.
- Adding a discount after the invoice is issued instead of issuing a credit note.
Make it routine
The easiest way to stay consistent is to store your customers’ GSTINs and your items’ HSN codes once, then generate invoices from a quotation. That way each invoice starts from complete data instead of being typed fresh.
Rules change and every business is different, so please confirm the details with your chartered accountant.