Invoice Number Generator
Free invoice number generator with prefix & financial year format
Frequently asked questions
What is the GST rule for invoice numbering?
Under Rule 46 of CGST Rules, invoice numbers must be: unique, sequential, max 16 characters, contain only alphanumeric/dash/slash, and reset every financial year (April 1).
What's a good invoice numbering format?
A common GST-compliant format is PREFIX/FY/SEQUENCE — e.g., INV/25-26/0001. This shows business prefix, financial year, and sequence number, making audits easy.
Can I have separate invoice series?
Yes — GST allows multiple series (e.g., one per branch, business vertical, or document type). Each series must be sequential within itself, and you must declare them in your books.
Do I need to restart numbering each year?
Yes — GST mandates a fresh sequence at the start of every financial year (1 April). You can keep the prefix and just reset the counter.
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