💡 Key Takeaways:
- A Bill of Supply is issued when no GST can be charged on a transaction.
- Composition taxpayers and sellers of exempted goods must issue a Bill of Supply.
- Unlike a Tax Invoice, a Bill of Supply never shows tax rates or tax amounts.
- Buyers cannot claim Input Tax Credit (ITC) using a Bill of Supply.
- Transactions under ₹200 do not require an invoice unless requested by the buyer.
Issuing the wrong invoice under Indian GST law can instantly trigger tax notices, audit red flags, and compliance penalties. While registered businesses routinely issue a standard Tax Invoice to collect tax, specific transactions strictly prohibit tax collection. In those exact scenarios, the law mandates an entirely different commercial document.
That document is the Bill of Supply. Whether you are a small retailer enrolled under the Composition Scheme or a distributor dealing exclusively in tax-exempt agricultural items, issuing this document correctly is a mandatory legal requirement. Failing to understand the underlying rules creates serious accounting headaches during annual return reconciliations.
In this comprehensive guide, we unpack everything you need to know about the Bill of Supply in 2026. We cover its statutory foundation under Section 31 of the CGST Act, key differences against a regular invoice, mandatory invoice fields, and critical advice from our active CA practice.
What Is a Bill of Supply under GST?
A Bill of Supply is a legally mandated document issued by a GST-registered business when supplying goods or services on which no Goods and Services Tax (GST) can be charged to the buyer. Governed by Section 31(3)(c) of the Central Goods and Services Tax (CGST) Act, it serves as official proof of sale for non-taxable transactions. Because no tax is collected, the recipient cannot claim Input Tax Credit on the purchase.
When Must You Issue a Bill of Supply?
The GST framework explicitly defines which businesses and transactions require a Bill of Supply instead of a traditional tax invoice. There are two primary categories of sellers and one specific threshold exception recognized by law.
1. Composition Scheme Taxpayers
Taxpayers who opt for the Composition Scheme pay tax at a flat rate directly to the government out of their turnover. Under the law, composition dealers are strictly prohibited from collecting tax from their customers. Therefore, whenever a composition dealer sells goods or services, they must issue a composition invoice titled specifically as a Bill of Supply. This document must carry a mandatory declaration stating: “Composition taxable person, not eligible to collect tax on supplies.”
2. Suppliers of Exempted Goods and Services
When a regular GST-registered business supplies exempted goods or services—such as unprocessed fresh food, fresh milk, or healthcare services—no tax applies. Even though the seller holds a regular GST Registration, they cannot issue a standard tax invoice for these items. They must issue a Bill of Supply documenting the exempt transaction.
3. Small Value Transactions under ₹200
Under statutory provisions issued by the CBIC Official portal, a registered person does not need to issue a Bill of Supply if the value of the goods or services supplied is less than ₹200. This relaxation applies only if the recipient is unregistered and does not demand an invoice. The seller can instead consolidate all such small daily sales into a single aggregate Bill of Supply at the close of the business day.
Bill of Supply vs Tax Invoice: Key Differences
Understanding the exact legal boundaries between a tax invoice and a Bill of Supply is critical for flawless bookkeeping. The table below outlines their primary operational distinctions under current Indian tax law.
| Feature / Parameter | Tax Invoice | Bill of Supply |
|---|---|---|
| Primary Purpose | Collect tax on taxable supplies | Record non-taxable or exempt supplies |
| Tax Charged? | Yes (CGST, SGST, IGST clearly shown) | No (Zero tax displayed) |
| Input Tax Credit (ITC) | Eligible for buyer claim | Not eligible for ITC |
| Issued By | Regular GST-registered taxpayers | Composition taxpayers & exempt sellers |
| Statutory Reference | Section 31(1) of CGST Act | Section 31(3)(c) of CGST Act |
Tax Collection and Input Tax Credit Restrictions
The most important distinction centers on Input Tax Credit. When a buyer receives a valid tax invoice, they can offset the GST paid against their output liability. However, a Bill of Supply carries zero tax component. Buyers who receive a Bill of Supply cannot claim any ITC credit on that transaction under any circumstances.
Mandatory Formatting Differences
While both documents require the seller’s business name and GSTIN, a tax invoice contains detailed tax rate columns (e.g., 5%, 12%, 18%, 28%). Conversely, a Bill of Supply omits tax rate columns entirely. It focuses exclusively on item descriptions, quantities, values, and applicable discounts.
Mandatory Rules under Section 31 of CGST Act
GST compliance rules under Section 31 stipulate that every Bill of Supply must contain specific statutory elements to be considered legally valid by tax authorities during an audit.
Section 31(3)(c) Legal Provisions
According to rule 49 of the CGST Rules, read alongside Section 31(3)(c), a valid document must contain the supplier’s name, address, and 15-digit GSTIN. It must also feature a consecutive serial number not exceeding 16 characters, containing alphabets, numerals, or special characters like hyphens or slashes, unique for each financial year (e.g., FY 2025-26).
HSN Code Reporting Requirements
Accurate commodity classification remains vital across all invoicing. Official guidelines managed on the GST Portal mandate the reporting of HSN (Harmonized System of Nomenclature) codes on a Bill of Supply based on aggregate annual turnover:
- Businesses with turnover up to ₹5 crore must report a minimum 4-digit HSN code for B2B supplies.
- Businesses with turnover exceeding ₹5 crore must report a 6-digit HSN code on all supplies.
What Our CA Team Sees in Practice
Practical compliance often diverges from legal theory. Based on compliance audits conducted by our team at Delhi Tax Solutions, small business owners repeatedly make three costly invoicing mistakes.
1. Illegally Collecting GST on a Composition Invoice
We frequently encounter new clients under the composition scheme who mistakenly print tax percentages on their bills. Collecting tax when issuing a composition invoice is a direct statutory violation. Tax authorities can impose a 100% penalty on the tax amount illegally collected, alongside interest charges under Section 50.
2. Mixing Exempt and Taxable Items Improperly
Traders selling both taxable items (e.g., packaged snacks at 12%) and exempt items (e.g., unbranded grains at 0%) often wonder if they must issue two separate papers. Under GST rules, a registered person supplying both taxable and exempt goods to an unregistered person can issue a single “Invoice-cum-Bill of Supply.” However, for B2B transactions, keeping documents separate simplifies quarterly reporting.
3. Entity Formation and Invoicing Structure
When entrepreneurs establish a new business venture through our Start a Business advisory programs, we stress choosing the correct invoicing architecture early. Whether operating as a sole proprietorship, partnership, or registering a company via Company Registration, setting up automated billing templates prevents expensive historical corrections.
How to Generate a Valid Bill of Supply Step-by-Step
Generating a compliant document is straightforward when following a structured sequence. Ensure your billing software or physical invoice book includes these sequential steps:
1. Essential Header Declarations
At the very top of the page, prominently print the title: BILL OF SUPPLY. If you are registered under composition levy, add the compulsory statutory declaration line directly beneath the header. Include your business logo, legal entity name, address, and GSTIN.
2. Customer Details and Itemized Breakdown
Record the document date and unique sequential serial number. For registered buyers, record their name, address, and GSTIN. For unregistered buyers, basic contact details suffice. List the goods or services, corresponding HSN/SAC codes, quantities, rates, and total net value after applicable trade discounts.
3. Filing and Record Retention Obligations
Sign the document physically or via authorized Digital Signature Certificate (DSC). Under statutory rules verified by the Press Information Bureau notifications, businesses must retain copies of all issued bills for at least 72 months (6 years) from the due date of filing the relevant annual return.
If you also operate a small manufacturing or service unit, securing an MSME Registration can help you access priority credit schemes while keeping your compliance structure lean under the composition scheme.
Conclusion: Mastering the distinction between a tax invoice and a Bill of Supply is a foundational pillar of Indian business compliance. Remember the essential rules: if you operate under the composition scheme or trade in tax-exempt items, issuing a Bill of Supply is non-negotiable. Never collect GST on this document, ensure your serial numbering remains strictly sequential, and adhere to HSN digit rules. Talk to a Delhi Tax Solutions expert to get your GST registration filed within 3 days and ensure your business billing templates are 100% compliant today. Proper documentation today guarantees smooth, stress-free tax filing tomorrow.
Frequently Asked Questions (FAQ)
Q: What is a bill of supply under GST and when is it issued?
A: A bill of supply is a commercial document issued by a GST-registered supplier when no tax can be charged on the transaction. Governed by Section 31(3)(c) of the CGST Act, it must be issued whenever a composition scheme dealer sells goods or services, or when a regular dealer supplies tax-exempt goods or services.
Q: What is the difference between a tax invoice and a bill of supply?
A: The fundamental difference is that a tax invoice is issued for taxable sales and clearly states the GST rate and tax amount collected, allowing the buyer to claim Input Tax Credit (ITC). A bill of supply contains zero tax charges, is issued for exempt or composition sales, and cannot be used to claim ITC.
Q: Can a composition dealer charge GST on a bill of supply?
A: No, a composition dealer cannot charge GST on a bill of supply under any circumstances. Composition taxpayers pay a flat tax rate out of their own turnover and are legally prohibited from collecting tax from buyers. Every composition invoice must state that the dealer is not eligible to collect tax on supplies.
Q: Is HSN code mandatory on a bill of supply in 2026?
A: Yes, HSN code reporting is mandatory on a bill of supply according to turnover thresholds. Businesses with an annual aggregate turnover up to ₹5 crore must include at least a 4-digit HSN code for B2B sales, while businesses with turnover exceeding ₹5 crore must report a 6-digit HSN code across all supplies.
Q: Is a bill of supply required for transactions under ₹200?
A: A seller is not required to issue an individual bill of supply if the value of the transaction is less than ₹200, provided the recipient is unregistered and does not request an invoice. The seller can instead generate a single consolidated bill of supply for all such small sales at the end of the day.
About this article: Researched using official government sources, real-time competitor and search-trend analysis, and Delhi Tax Solutions’ in-house tax advisory team. Last updated September 2026. This article is for general informational purposes and is not a substitute for personalised professional tax advice.
