Before you send invoices, set up the firm details that appear on them — your GSTIN, address, and bank details. You only need to do this once.
Where to set them
Go to Settings → Configuration. There you can set:
GSTIN — your 15-character GST Identification Number.
Organization address — the billing address shown on invoices.
Bank details — account name, number, IFSC, bank, and branch. These appear in the invoice footer so clients know how to pay.
Tips
Double-check the GSTIN format — invalid numbers are flagged so you can correct them.
Add your firm's logo under Settings → Organization for a polished invoice.