GST Pro DocsInvoice Numbering
Choose between Shopify order numbers and custom GST invoice numbers with prefixes, per-financial-year sequences, and zero-padding.
Overview
GST Pro gives you two numbering modes:
- Same as order numbers — the invoice number mirrors the Shopify order number, with an optional prefix/suffix.
- Custom invoice numbers — a fully controlled sequence with a prefix, suffix, starting number, and zero-padding, configured per financial year (India's FY runs 1 April → 31 March). The sequence restarts each financial year.
Before you start
- Decide whether your accountant needs a clean per-year sequence (use Custom) or whether mirroring Shopify order numbers is enough (use Same as order numbers).
- Know the financial year you're starting from and the first number you want.
Steps
Pick a mode
Choose Same as order numbers or Custom invoice numbers.
The invoice number follows the Shopify order number. You can still add a prefix and suffix. This mode has no financial-year awareness — numbers run continuously with your orders.
You define a format for each financial year. For each year you set:
- Prefix — text before the number (e.g.
INV/). - Suffix — text after the number (e.g.
/24-25). - First invoice number for the financial year — the number the sequence starts at.
- Minimum digits — zero-padding, 0–10 (e.g. 4 digits turns
1into0001).
The sequence restarts at your start number on 1 April each year.
Add a format for the financial year (custom mode)
Click Add, choose the financial year (e.g. 2026 = 1 Apr 2026 → 31 Mar 2027), and fill in the prefix, suffix, start number, and minimum digits. Enable Start with custom number every financial year to reset the count each year.
GST Pro computes the invoice number from the order's position within the financial year, so the first order of the year becomes your chosen start number, the next becomes start + 1, and so on — independent of the raw Shopify order number.
Save and verify
Save, then generate an invoice for an order in that financial year and confirm the prefix, number, padding, and suffix all match.
Result
Invoices carry a clean, predictable number in your chosen format, with the sequence resetting each financial year when you use custom numbering.
Avoid changing the start number or format mid-year once you've issued invoices — it can create gaps or duplicate numbers in an already-issued sequence.