Free Invoice Number Generator – Create GST-Compliant Invoice Series

Invoice Number Generator

Enter prefix and financial year

Invoice Prefix Your business abbreviation or branch code

Financial Year

Starting Number

Number of Invoice Numbers to Generate

Separator

Invoice Number Series

Format

—

Total Generated

—

💡 Business Impact

Sequential, unique invoice numbers are mandatory for GST compliance. Gaps or duplicates can trigger audit questions.

Recommended Actions

✓ Reset series at the start of each financial year

✓ Maintain separate series for different invoice types

✓ Never leave gaps in the invoice sequence

✓ Include branch code for multi-location businesses

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Formula & How It Works

Format: [PREFIX][SEP][FY][SEP][SEQUENCE]
Example: INV/25-26/0001
Rules: Max 16 characters | Sequential | Unique per FY | Alphanumeric + / and -

Worked Example

Single branch: INV/25-26/0001 → INV/25-26/0002 → ... → INV/25-26/0010

Multi-branch: MUM/25-26/0001 (Mumbai) | DEL/25-26/0001 (Delhi)

When to Use This Calculator

Generate invoice number series before financial year start
Create branch-wise invoice series for multi-location business
Ensure sequential numbering for GST compliance
Plan invoice numbering convention for new business
Train billing team on correct invoice number format

Frequently Asked Questions

What is the format for GST invoice numbers? +

GST invoice numbers must be unique within a financial year, can be up to 16 characters, alphanumeric, and consecutive. They cannot contain special characters except / and -.

Should invoice numbers reset every financial year? +

Yes. Invoice serial numbers should reset at the beginning of each financial year (April 1). Use the financial year in the prefix (e.g. 24-25/INV/001).

Can I use the same invoice number for GST and non-GST bills? +

It's best to maintain separate series for tax invoices, credit notes, and debit notes as per GST rules.

What happens if invoice numbers are not sequential? +

GST audit may flag gaps in invoice sequences. Always maintain a sequential, unbroken series within a financial year.

Can I have multiple invoice series? +

Yes. You can have different prefixes for different branches, supply types, or business verticals — as long as each series is internally sequential.