Invoice Number Generator

Generate a clean, GST-compliant invoice number in a financial-year format like INV/2026-27/001 — sequential, unique, and reset per year.

How it works

GST rules require invoice numbers to be consecutive, unique, and no more than 16 characters, within a series. A financial-year format like INV/2026-27/001 keeps them ordered, resets cleanly each April, and makes GSTR-1 filing painless. Never reuse or skip a number — gaps invite questions.

Frequently asked

What are the rules for GST invoice numbers?
They must be consecutive, unique within a financial year, and up to 16 characters (letters, numbers, / and - allowed). A per-FY series that resets each April is the standard approach.
Can I reset invoice numbers each year?
Yes — a new series per financial year is normal and recommended, as long as numbers stay consecutive and unique within each year.

Retainer numbers every invoice for you in a financial-year-safe series that resets automatically each April — no manual counter to get wrong. Try Retainer free