GST Invoice vs Bill of Supply: Which One Should You Issue?

Choosing the correct GST document is important for every registered business. Many traders, retailers, service providers and small businesses often get confused between a GST invoice and a bill of supply.

Both documents are issued under GST, but they serve different purposes.

A GST invoice is generally issued when GST is charged on a taxable supply. A bill of supply is issued when GST is not charged, such as by composition taxpayers or suppliers dealing in exempt goods or services.

Issuing the wrong document can create problems during GST return filing, customer reconciliation, Input Tax Credit (ITC) claims and compliance reviews.

This guide explains the difference between GST invoice and bill of supply, when to issue each document, mandatory details, examples and how businesses can manage GST billing more efficiently.

What Is a GST Invoice?

A GST invoice is a tax document issued by a registered supplier when selling taxable goods or services where GST is applicable.

It acts as proof of supply and shows:

• Supplier details
• Customer details
• GSTIN details
• Product or service information
• HSN/SAC codes
• Taxable value
• GST rate
• CGST, SGST or IGST amount
• Total invoice value

A GST invoice also helps the buyer claim eligible Input Tax Credit (ITC), provided other GST conditions are satisfied.

Under GST, tax invoices are governed by Section 31 of the CGST Act and prescribed particulars under Rule 46.

For creating compliant invoices, businesses can use GimBooks’ GST Invoice Format.

What Is a Bill of Supply?

A bill of supply is a document issued when GST is not charged on the transaction.

Unlike a GST invoice, a bill of supply does not show GST separately because no tax is collected from the customer.

A bill of supply is generally issued by:

• Composition scheme taxpayers
• Suppliers providing exempt goods or services
• Businesses where GST is not applicable on the supply

A bill of supply contains supplier details, recipient details, description of goods/services, value of supply and other required particulars, but does not include GST tax calculation.

GST Invoice vs Bill of Supply: Quick Comparison

GST Invoice vs Bill of Supply: When Should You Issue Each?

The easiest way to decide is to check whether GST is being charged.

Issue a GST Invoice When:

You should issue a GST invoice when:

• You sell taxable goods
• You provide taxable services
• GST is applicable on the transaction
• The customer requires GST documentation
• The buyer may need ITC eligibility

Examples:

Example 1: Retail Sale

A Maharashtra electronics dealer sells a laptop worth ₹50,000 plus 18% GST.

The seller should issue:

GST Invoice

because GST is charged.

Example 2: Service Provider

A digital marketing agency provides services worth ₹1,00,000 plus GST.

The agency should issue:

GST Invoice

because the service is taxable.

Issue a Bill of Supply When:

A bill of supply is generally issued when GST is not charged.

Common situations:

1. Composition Scheme Businesses

Example:

A small retailer registered under the GST composition scheme sells goods to customers.

The retailer cannot collect GST separately.

The correct document:

Bill of Supply

2. Exempt Goods or Services

Example:

A supplier provides an exempt service where GST is not applicable.

The supplier issues:

Bill of Supply

GST Invoice vs Bill of Supply Examples

Can a Bill of Supply Claim Input Tax Credit?

No. A bill of supply does not include GST charged separately, so the recipient cannot claim Input Tax Credit based on GST amount.

For ITC claims, businesses generally require a valid GST tax invoice containing applicable GST details.

A common mistake among businesses is treating every GST document as eligible for ITC. The document type matters.

GST Invoice Mandatory Details

A GST invoice should generally include:

Supplier Details

• Legal business name
• Registered address
• GSTIN

Invoice Details

• Invoice number
• Invoice date
• Due date where applicable

Customer Details

• Customer name
• Address
• GSTIN/UIN where applicable

Goods or Services Details

• Description
• HSN/SAC
• Quantity
• Unit price
• Taxable value

GST Details

• GST rate
• CGST
• SGST
• IGST
• Cess if applicable

Total Details

• Total invoice value
• Signature/digital authentication where applicable

For a complete checklist, read:

GimBooks GST Invoice Mandatory Fields Audit Checklist

Bill of Supply Mandatory Details

A bill of supply should include:

• Supplier name
• Supplier address
• GSTIN
• Serial number
• Date of issue
• Recipient details
• Description of goods/services
• HSN/SAC where applicable
• Value of supply
• Signature/digital authentication

Unlike a GST invoice, it does not include:

• GST rate
• CGST amount
• SGST amount
• IGST amount

Common Mistakes Businesses Make

Mistake 1: Issuing Bill of Supply for Taxable Sales

Some businesses issue a bill of supply even when GST is applicable.

Why it is wrong:

• GST is not collected properly
• Buyer may not receive valid GST documentation
• Compliance issues may arise

Mistake 2: Showing GST on Bill of Supply

A bill of supply should not show GST as a separately collected tax.

If GST is charged:

Use a GST invoice.

Mistake 3: Composition Dealer Issuing Tax Invoice

Composition taxpayers cannot issue normal tax invoices charging GST.

They issue:

Bill of Supply

Mistake 4: Wrong Document Selection in Billing Software

Selecting the wrong invoice type during billing can affect:

• GST reports
• Customer records
• Tax calculations
• Compliance reporting

Businesses should configure their billing software properly.

GST Invoice vs Bill of Supply: Decision Checklist

Use this checklist before creating a document.

GST Billing Workflow: How Businesses Should Manage Documents

A simple GST billing workflow:

Step 1: Identify Supply Type

Check:

• Taxable supply
• Exempt supply
• Composition supply

Step 2: Select Correct Document

Choose:

• GST Invoice
• Bill of Supply

Step 3: Add Customer Details

Verify:

• Customer name
• GSTIN
• Address
• State code

Step 4: Add Product or Service Details

Include:

• Description
• HSN/SAC
• Quantity
• Rate
• Tax details

Step 5: Review Before Sharing

Check:

• Document type
• GST calculation
• Customer details
• Invoice numbering
• Total value

GST Invoice vs Bill of Supply: Which One Should Small Businesses Use?

For most regular GST-registered businesses selling taxable goods or services:

GST Invoice is the correct document.

For:

• Composition taxpayers
• Exempt supply providers

Bill of Supply is generally used.

The correct choice depends on the nature of supply, not business size.

A small business can issue GST invoices if GST applies, while a larger business may issue bills of supply for exempt transactions.

How GimBooks Helps Create GST-Compliant Documents

Managing different GST documents manually can create errors, especially when businesses handle multiple customers, products and tax rates.

With GimBooks GST Billing Software, businesses can create and manage GST invoices, maintain customer records and organize billing workflows.

GimBooks helps businesses:

• Create GST invoices quickly
• Maintain invoice formats
• Manage customer details
• Calculate GST automatically
• Track billing records
• Generate GST reports
• Manage invoices from mobile and web

Businesses can also use ready templates like:

• GST Invoice Format
• Bill of Supply Format
• Delivery Challan Format

GST Invoice vs Bill of Supply: Final Checklist

Before issuing any GST document:

✓ Check whether GST applies ✓ Confirm business registration type ✓ Select correct document type ✓ Verify customer GSTIN ✓ Add correct HSN/SAC ✓ Check taxable value ✓ Apply correct tax treatment ✓ Review invoice numbering ✓ Save document records ✓ Maintain GST reports

Conclusion

Understanding the difference between GST invoice and bill of supply helps businesses avoid billing mistakes and maintain GST compliance.

A GST invoice is used when taxable goods or services are supplied and GST is charged. A bill of supply is used mainly for composition taxpayers and exempt supplies where GST is not collected.

Before issuing any document, businesses should check the nature of supply, GST applicability and customer requirements.

Using GST billing software like GimBooks can help businesses select the correct document type, maintain accurate records and simplify everyday billing operations.

FAQs

What is the difference between GST invoice and bill of supply?

A GST invoice includes GST charged on taxable supplies, while a bill of supply is issued when GST is not charged, such as exempt supplies or composition scheme transactions.

Can a composition dealer issue a GST invoice?

No. A composition taxpayer generally issues a bill of supply and cannot collect GST separately from customers.

Can a customer claim ITC on a bill of supply?

No. A bill of supply does not contain GST charged, so it does not support ITC claims.

When should I issue a GST invoice?

Issue a GST invoice when supplying taxable goods or services where GST is applicable.

When should I issue a bill of supply?

Issue a bill of supply for exempt supplies or when registered under the composition scheme.

Does a bill of supply require HSN or SAC?

Yes, applicable HSN codes for goods or accounting codes for services may be required.

Can I create GST invoices and bills of supply using billing software?

Yes. GST billing software like GimBooks helps businesses create GST invoices, manage customer records and maintain billing reports.

Is GST invoice mandatory for every sale?

Registered businesses supplying taxable goods or services generally need to issue GST invoices as required under GST rules.