GST Invoice Guide for Mumbai Businesses & Freelancers (2026)
If your business is registered in Maharashtra, your GSTIN starts with the state code 27 — a small detail that causes a surprising number of invoice rejections when it's typed incorrectly or copied from the wrong template.
GST invoicing basics for Mumbai businesses
Any business registered in Maharashtra carries the state code 27 as the first two digits of its GSTIN. This single detail decides whether a transaction is treated as intra-state (CGST + SGST) or inter-state (IGST) — and getting it wrong is one of the most common reasons an invoice gets flagged during a client's own GST reconciliation.
What's different about invoicing from Mumbai
Mumbai's business landscape leans heavily on BFSI, media, and performance-marketing agencies, centred around Andheri, BKC and Lower Parel. Mumbai agencies frequently bill out-of-state D2C brand clients, so getting the IGST vs CGST+SGST split right on the first invoice matters for faster payment approvals
Building a compliant invoice, step by step
- Confirm your GSTIN begins with 27 (for Maharashtra) and double-check the buyer's GSTIN state code too — don't assume it matches their office address.
- Decide CGST+SGST vs IGST based on the *place of supply*, not just the billing address on the client's letterhead.
- Use a sequential invoice number series per financial year, as required under GST rules — this matters even more if you invoice several Mumbai clients from the same series.
- Fill in the correct HSN/SAC code for your goods or service category — this is checked more closely for B2B invoices than B2C.
- Generate the invoice with Utility Hub's free GST Invoice Generator, export to PDF, and keep a static copy — banks and auditors in Mumbai routinely ask for a saved copy, not just a shareable link.
When to double-check with a CA
This guide covers the standard GST invoice format used nationwide, including in Maharashtra. For anything involving exports, reverse charge, or composition scheme, confirm the specifics with your CA before sending the invoice to a client.
Frequently asked questions
Does this invoice generator work for businesses outside Mumbai?
Yes — it works for any Indian state. The Mumbai guide simply starts from the Maharashtra (27) state code, which you can change for any other state.
Is this a valid GST invoice format for Maharashtra?
It follows the standard Indian GST invoice format (GSTIN, HSN/SAC, taxable value, CGST/SGST/IGST breakup) used nationwide, including Maharashtra. Confirm final compliance with your CA for your specific business type.
Is my invoice data uploaded anywhere?
No — the invoice is generated entirely in your browser; nothing is sent to a server.