Invoice software for Indian SMBs
The simplest invoice software in India.
21bill is online invoice software built for Indian small businesses. Create GST tax invoices, proforma, quotations, credit notes, and payment receipts — five documents, one clean interface. Works in any browser. 21bill is an invitation-only platform.
The 5 documents Indian SMBs issue — and when each is right.
Quotation
Price estimate before the sale is agreed. Not a legal instrument; no GST liability. Convert to invoice once the customer accepts.
Proforma invoice
Advance-payment request. Looks like an invoice but isn't a tax invoice — doesn't create GST liability until payment is received.
Tax invoice
The legal GST document. Required within 30 days of supply for services, at time of removal for goods. Goes on your GSTR-1.
Credit note
Issue when a sale is reduced post-invoice — returns, discounts, corrections. Gets reported in GSTR-1 CDNR table.
Payment receipt
Acknowledgment that money came in. Auto-generated when you record a payment against an invoice.
Full explainer: Invoice vs. proforma vs. quotation — when to use which.
Payment chasing without the awkwardness.
Indian B2B runs on credit. 21bill sends scheduled email reminders on overdue invoices, surfaces a customer-aging dashboard, and pairs each reminder with a well-drafted template you can pick the tone for.
21bill is invitation-only.
We work with a closed cohort of Indian SMBs. Tell us about your invoicing workflow and we'll get back to you.