Knowledge Base & Tutorials

Invoicing Guides & Tax Knowledge

Everything you need to know about professional billing, GST regulations, and getting paid on time.

Advertisement Space

Clean AdSense banner placeholder (Format: horizontal)

GST Essentials

What is a GST Invoice and When is it Mandatory?

A GST Invoice (also referred to as a Tax Invoice) is a legal document issued by a registered taxpayer when selling taxable goods or services in India. Under the GST regime, a valid tax invoice is the primary document required by the buyer to claim Input Tax Credit (ITC).

Under Section 31 of the CGST Act, 2017, issuing a tax invoice is mandatory whenever taxable goods or services are supplied, unless the value of the supply is less than ₹200 and the recipient is unregistered and does not request an invoice.

Difference Between Tax Invoice & Bill of Supply:

• Tax Invoice: Issued for taxable supplies where GST is charged and ITC can be claimed.

• Bill of Supply: Issued when supplying exempt goods/services or when the supplier is registered under the GST Composition Scheme (where tax cannot be charged to customers).

Create a GST Invoice Online

Tax Calculations

CGST vs SGST vs IGST: How Tax is Calculated on Invoices

The Indian GST structure is divided into three components based on the geographic location of the buyer and seller:

CGST (Central GST)

Collected by the Central Government on intra-state supplies.

SGST (State GST)

Collected by the State Government on intra-state supplies.

IGST (Integrated GST)

Collected on inter-state supplies (between two different states) and imports.

Real-World Calculation Example:

Assume a service with taxable value of ₹10,000 under the 18% GST slab:

• Intra-State (Same State): CGST (9%) = ₹900 + SGST (9%) = ₹900. Total = ₹11,800.

• Inter-State (Different State): IGST (18%) = ₹1,800. Total = ₹11,800.

Freelancer Guide

Invoice Format and Best Practices for Freelancers & Solo Contractors

As a freelance designer, developer, or consultant, a professional invoice conveys credibility and ensures you get paid without administrative delays.

Itemize Milestones & Deliverables: Instead of vague descriptions, write specific deliverables (e.g. “Phase 1: Wireframing & UI Prototype” or “20 hours consulting @ ₹1,500/hr”).
Always State Payment Terms: Net 7, Net 15, or Due Upon Receipt. Specify preferred payment channels (UPI ID, Direct Bank Transfer, or PayPal).
Maintain Sequential Invoices: Never reuse an invoice number. Keep a clean sequential numbering series for tax filing and audit tracking.

Create a Freelancer Invoice Now

Best Practices

Invoice Numbering Systems: Best Practices & Formats

A consistent invoice numbering scheme prevents duplicates, simplifies bookkeeping, and is a mandatory legal requirement under most commercial and tax authorities.

Prefix + Sequential NumberINV-001, INV-002, INV-003

Simple, clean, and universal for small businesses.

Year / Financial Year Based2026-INV-1001, 26-27/001

Ideal for resetting numbers each financial year.