Bill Of Supply Vs Tax Invoice Under GST: The 2026 Control Guide

Key Takeaways

A tax invoice is mandatory for every taxable supply, a bill of supply is issued only for exempt supplies or by composition dealers, these documents are not interchangeable.
Input Tax Credit is unlocked only by a valid tax invoice or debit note, a bill of supply never generates ITC and will not appear in GSTR-2B.
Exports are zero-rated, not exempt, whether with IGST payment or under LUT, you must issue a tax invoice, not a bill of supply.
Composition dealers cannot collect GST or issue tax invoices, any ITC booked against their documents is inadmissible.
Operationally, tag vendors as taxable, composition, or exempt, and block ITC posting for the latter two, automate 2B matching with tools like AI Accountant GST Reconciliation.

A vendor sends you a bill of supply, your AP team books ITC anyway. GSTR-2B shows nothing. Now you have an ITC claim with no supporting document, and a potential penalty of ₹10,000 or the tax evaded, whichever is higher, under Section 122(1)(v) of the CGST Act, 2017.

A tax invoice is the only document that unlocks Input Tax Credit for a recipient, see AI Accountant GST Reconciliation. A bill of supply carries no tax, shows no tax, and cannot generate ITC, ever. The rule is in Section 31 of the CGST Act, 2017: issue a tax invoice for every taxable supply, and a bill of supply only when the supply is exempt or the supplier is on the composition scheme. Getting this wrong does not just block ITC, it triggers document correction obligations, GSTR-2B mismatches, and penalty exposure.

Bill Of Supply Vs Tax Invoice Under GST: The Short Answer

A tax invoice is issued for every taxable supply, a bill of supply is issued only for exempt supplies or by composition dealers, the two documents are legally distinct and not substitutable.

Legal basis — Tax Invoice: Section 31(1), CGST Act, 2017; Bill of Supply: Section 31(3)(c), CGST Act, 2017
Who issues it — Tax Invoice: Any registered supplier making a taxable supply; Bill of Supply: Composition dealers, suppliers of exempt or non-GST goods or services
Tax shown on document — Tax Invoice: Yes, CGST, SGST, or IGST explicitly stated; Bill of Supply: No, tax cannot appear on the document
ITC for recipient — Tax Invoice: Eligible under Section 16(2)(a); Bill of Supply: Not eligible, ever
E-invoicing — Tax Invoice: Applicable above ₹5 crore aggregate turnover for B2B and exports; Bill of Supply: Not applicable
Mandatory fields rule — Tax Invoice: Rule 46, CGST Rules, 2017; Bill of Supply: Rule 49, CGST Rules, 2017
GSTR-2B reflection — Tax Invoice: Appears as ITC eligible line; Bill of Supply: Does not appear as ITC line
Reverse Charge flag — Tax Invoice: Required; Bill of Supply: Not required

The rule most teams get wrong, a zero-rated export supply is not an exempt supply. Exports under LUT still require a tax invoice, not a bill of supply.

What Is The Decisive Rule: Bill Of Supply Vs Tax Invoice Under GST?

The CGST Act draws a clean line, taxable supply means tax invoice, full stop. If no tax is being collected, because the supply is exempt, non-taxable, or the supplier pays tax themselves under composition, a bill of supply is issued instead.

The Trigger: Nature Of Supply And Supplier Category

Section 31(1) of the CGST Act, 2017 requires a registered person to issue a tax invoice before or at the time of removal of goods or supply of services. Section 31(3)(c) then carves out the exception, a registered person supplying exempt goods or services, or a registered person paying tax under the composition scheme under Section 10, must issue a bill of supply instead.

Two conditions trigger a bill of supply, either the supply is exempt, no GST applicable, or the supplier is a composition dealer, GST is absorbed by the supplier, not collected from the buyer. Neither condition is about the buyer's status.

Example: A composition dealer sells goods worth ₹2 lakh to a B2B buyer. The buyer wants ITC. The composition dealer cannot provide it. The correct document is a bill of supply. Even if the dealer labels the document 'tax invoice', no ITC flows, the legal document type is determined by the supplier's registration, not the label.

What A Bill Of Supply Cannot Show

Rule 49 of the CGST Rules, 2017 is explicit, a bill of supply shall not contain any tax charged. This is not a formatting preference, it is a prohibition. If a supplier shows CGST or SGST on a bill of supply, that document is non-compliant and the recipient still cannot claim ITC because the underlying supply is either exempt or from a composition dealer.

The fields a bill of supply must contain include, supplier name, address, and GSTIN, a consecutive serial number unique to the financial year, date of issue, recipient's name, address, and GSTIN or UIN if registered, HSN code, description, value of supply net of any discount, and the supplier's signature or digital signature.

Frequently Asked Questions About Tax Invoice Vs Bill Of Supply Basics

Can a supplier issue a bill of supply for a taxable supply if the amount is small?
No. The document type is determined by whether the supply is taxable, not by the transaction value. Section 31(1) of the CGST Act, 2017 requires a tax invoice for every taxable supply. The only threshold based relaxation is for certain address fields when the recipient is unregistered and value is below ₹50,000 under Rule 46, it remains a tax invoice. A bill of supply is never appropriate for a taxable supply regardless of value.

Is a composition dealer's document a tax invoice or bill of supply under GST?
It is a bill of supply. Composition dealers registered under Section 10 cannot collect GST from recipients and therefore cannot issue tax invoices. The CBIC FAQ on Composition Levy confirms this. Any recipient who books ITC based on a document from a composition dealer has claimed ITC without a valid document, that ITC is disallowable.

When Do You Issue Each Document: Practical Scenarios In FY 2025–26

The decisive question every Monday morning is not “what document did the supplier send?”, but “what kind of supplier is this and what kind of supply is this?”. These two facts determine the correct document before the transaction is even entered.

Taxable Supply By Regular Registered Dealer

This is the straightforward case. A regular GST registered supplier selling goods or services that are taxable issues a tax invoice with CGST, SGST or IGST explicitly stated. The recipient books ITC. GSTR-2B reflects it.

Example: A ₹5 lakh software service from a regular registered supplier attracts 18% GST. The tax invoice shows ₹90,000 IGST. The recipient claims ₹90,000 ITC. The invoice appears in GSTR-2B.

Exempt Or Non-GST Supply

If a supply falls under Schedule III or is specifically exempted by notification, for example, unprocessed agricultural produce or certain health services, no GST applies. The registered supplier issues a bill of supply. No ITC flows to the recipient, and none should be expected.

Watch for mixed vendors, a supplier selling both taxable and exempt goods must issue a tax invoice for taxable items and a bill of supply for exempt items. Rule 49 of the CGST Rules, 2017 recognizes bill of supply structure without tax, separate documents are cleaner and avoid classification disputes.

Composition Dealer Sales

A composition dealer's turnover limit is ₹1.5 crore, ₹75 lakh for certain states. They pay GST at a flat rate from their own pocket. They issue a bill of supply and must display the words “composition taxable person”. Tag these vendors at onboarding, any invoice from them is a bill of supply by definition.

Export Supplies: Tax Invoice Required In Both Cases

This is where teams make the most expensive mistake. An export supply, whether with payment of IGST or under an LUT or Bond, is zero-rated, not exempt. Both scenarios require a tax invoice per Rule 46 of the CGST Rules, 2017. For LUT exports, the invoice must carry the endorsement “Supply meant for export under bond or Letter of Undertaking without payment of Integrated Tax.” Issuing a bill of supply for an export treats the supply as exempt, an error that can unwind refund claims and trigger scrutiny.

Frequently Asked Questions About When To Issue Each Document

If a supplier sells both taxable and exempt goods, should they issue one document or two?
Two separate documents are safest. A tax invoice covers taxable goods with GST shown. A bill of supply covers exempt goods with no tax shown, per Rule 49. Combining them creates classification risk because a tax invoice cannot validly cover exempt supplies and a bill of supply cannot show tax.

Does a supplier under the Reverse Charge Mechanism issue a bill of supply or a tax invoice?
The supplier issues the document that corresponds to their status and supply type. Under RCM, Section 31(3)(f) of the CGST Act, 2017 requires the recipient to issue a self invoice if the supplier is unregistered. If the supplier is registered but the supply is under RCM, the supplier still issues a tax invoice for a taxable supply. The tax payment obligation shifts, the document type does not. Learn the accounting here, Reverse Charge Mechanism.

What Must Each Document Contain: Fields, HSN, And E-Invoicing Rules

Rule 46 and Rule 49 each carry a distinct field list. A tax invoice has more mandatory fields because it must support ITC claims, inter state transactions, and place of supply determination. A bill of supply is simpler, but missing even one mandatory field makes it non compliant.

Tax Invoice Mandatory Fields Under Rule 46

Supplier name, address, and GSTIN
Consecutive serial number, unique for the financial year
Date of issue
Recipient name, address, and GSTIN or UIN
For unregistered recipients where taxable value is ₹50,000 or more, recipient name, address of delivery, state name, and state code
HSN code of goods or services
Description of goods or services
Quantity and unit or Unique Quantity Code for goods
Total value of supply
Taxable value of supply
Rate of tax, CGST, SGST, IGST, UTGST, or cess
Amount of tax charged, separately for each tax head
Place of supply with state name for inter state supplies
Address of delivery if different from place of supply
Whether tax is payable on reverse charge basis
Supplier's signature or digital signature

Bill Of Supply Mandatory Fields Under Rule 49

Supplier name, address, and GSTIN
Consecutive serial number, unique for the financial year
Date of issue
Recipient name, address, and GSTIN or UIN
HSN code of goods or services
Description of goods or services
Value of supply net of any discount or abatement
Supplier's signature or digital signature
No tax amount, this field is absent and cannot be added

The bill of supply has no place of supply field, no tax rate, no tax amount, and no RCM flag. Those fields are absent because they serve no purpose when no tax is charged.

E-Invoicing: Who Is Covered And What It Applies To

As of 1 August 2023, e-invoicing is mandatory for all registered persons whose aggregate turnover exceeds ₹5 crore in any preceding financial year from FY 2017–18 onwards, per Notification No. 10/2023 – Central Tax dated 10 May 2023. In FY 2025–26, this threshold remains at ₹5 crore.

E-invoicing applies only to B2B tax invoices and export tax invoices. It does not apply to bills of supply. An IRN or QR code on a document does not tell you whether the document is a tax invoice or a bill of supply, it only tells you a tax invoice above threshold was reported to the IRP.

Sectors exempt from e-invoicing regardless of turnover include insurers, banks, NBFCs, GTAs, passenger transportation, multiplex cinemas, government departments and local authorities, and SEZ units, per Notification No. 10/2023. This exemption does not affect the underlying obligation, taxable supplies still require a tax invoice, exempt supplies require a bill of supply.

Frequently Asked Questions About Document Fields And E-Invoicing

Does e-invoicing apply to bills of supply issued by large taxpayers above ₹5 crore turnover?
No. E-invoicing under Notification No. 10/2023 covers only B2B and export tax invoices. Bills of supply are excluded. A supplier with ₹50 crore turnover issuing a bill of supply for an exempt supply does not need to generate an IRN for that document.

What happens if a tax invoice is missing the RCM flag and the supply is under reverse charge?
The tax invoice is non compliant under Rule 46, which requires a declaration of whether tax is payable on reverse charge basis. In an RCM scenario, the recipient pays the tax and issues a self invoice under Section 31(3)(f). Omitting the RCM flag creates mismatch risk during audit and can complicate ITC claims.

What Goes Wrong When You Mix Them Up: ITC Denial, 2B Mismatches, And Penalties

Issuing or accepting the wrong document type is not a paperwork technicality. It blocks ITC, creates GSTR-2B gaps, and exposes both the supplier and the recipient to penalties. These consequences compound across every affected transaction in the financial year.

ITC Is Blocked, No Exceptions

Section 16(2)(a) of the CGST Act, 2017 states that a registered person is entitled to ITC only if they hold a tax invoice or a debit note. A bill of supply does not qualify. If your AP team books a ₹10 lakh purchase from a composition dealer and claims ITC, it is inadmissible.

GSTR-2B Will Not Show It

GSTR-2B reflects only ITC eligible documents, tax invoices and debit notes filed by the supplier in GSTR-1. Bills of supply do not appear as ITC lines. If your books show an ITC claim but GSTR-2B shows nothing for that vendor, either the supplier filed a bill of supply or the supplier is composition. Either way, the ITC claim has no basis.

Worked example: You receive a ₹6 lakh purchase invoice from a vendor. Your team books ₹6 lakh as purchase and ₹1,08,000 as ITC. GSTR-2B shows zero ITC from this vendor. The vendor is on composition. The ₹1,08,000 ITC must be reversed. Interest at 24% per annum applies on excess ITC from the date of availment, per Section 50(3).

Penalty Exposure For The Supplier

Section 122(1)(v) imposes a penalty of ₹10,000 or the amount of tax evaded or ITC wrongly passed on, whichever is higher, on a supplier who issues an incorrect or false invoice. Section 125 provides a general penalty up to ₹25,000 for other contraventions.

Correcting The Wrong Document

If a supplier issued a bill of supply when a tax invoice was required, the fix is a two step process under Section 34(1), the supplier issues a credit note to cancel the incorrect bill of supply, then issues a fresh, correct tax invoice. The credit note must be issued by 30 November following the end of the financial year or the date of filing the relevant annual return, whichever is earlier, per Section 34(2). As the recipient, do not book ITC until the correct tax invoice is in hand.

Frequently Asked Questions About Consequences And Corrections

Can I reverse ITC already claimed on a bill of supply and avoid penalties?
Voluntary reversal in GSTR-3B limits interest exposure, but it does not automatically prevent a penalty under Section 122(1)(v) if audited. Reverse as soon as the error is identified and obtain the correct tax invoice.

What if the supplier refuses to issue a corrected tax invoice?
Do not book ITC without a valid tax invoice. Escalate in writing, citing Section 31(1) and Section 16(2)(a). If the vendor is composition or exempt, accept that no ITC is available and reflect that in procurement pricing.

The Operational Playbook: Controls In Tally To Stop The ITC Leak

Document type errors are often a data entry problem, not a knowledge problem. The finance team knows the rule, the system does not enforce it. These controls create enforcement at the point of entry, not at the point of GSTR-2B reconciliation.

Step 1: Tag Every Vendor Master Before Entry Begins

In Tally, classify each supplier ledger as regular taxable, composition dealer, or exempt supply. Create a naming convention or use cost centre tagging to make this visible at voucher entry.

For composition or exempt vendors, disable CGST, SGST, IGST tax ledgers so no ITC eligible tax can be entered.
For regular vendors, require a GSTIN on every purchase entry, a purchase voucher without a valid GSTIN should not post.

Enable bill wise entry, then you can match each tax invoice line in 2B to a specific purchase voucher.

Step 2: Pre-Booking Check On Every Inward Document

Before any invoice is posted, the entry operator answers three questions:

Is this vendor tagged as composition or exempt? If yes, this is a bill of supply, post without ITC.
Does the document show a tax amount? If yes but vendor is composition or exempt, flag for review.
Is there a valid GSTIN on the document and does it match the vendor master? If no, hold entry and query the vendor.

Step 3: Monthly GSTR-2B Reconciliation As A Control Gate

Run reconciliation within the first five working days after the 14th of each month.

Matched, tax invoice in books matches 2B line.
In books, not in 2B, investigate, it may be a bill of supply or a late filer.
In 2B, not in books, book it to claim ITC.

Resolve “in books, not in 2B” items before GSTR-3B. Do not carry unmatched ITC forward.

Step 4: Vendor Onboarding Checklist For New Suppliers

Collect and verify GSTIN, composition status, and supply category. Update the vendor master. Review composition status annually.

Step 5: Year-End Clean-Up Before 30 November

By 30 November, complete all document corrections for the prior financial year. For entries not resolved, obtain the correct tax invoice or reverse ITC.

Frequently Asked Questions About Tally Controls And Bill Of Supply Vs Tax Invoice GST India

How do you prevent ITC from being accidentally posted against a composition vendor in Tally?
Disable GST applicability on the composition vendor’s purchase ledger so CGST, SGST, IGST fields do not appear. Prefix composition vendor names with a clear tag like “COMP-” and enforce bill wise entry for traceable reconciliation.

What is the correct accounting treatment in Tally when you receive a bill of supply from an exempt supplier?
Post a purchase voucher with the full value as purchase, do not create any tax ledger entry. Use the supplier’s bill number as the reference. These entries will correctly show as “not in 2B” with no ITC, which is expected.

FAQ

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

A tax invoice is issued for every taxable supply and shows GST charged, which the recipient can claim as ITC under Section 16(2)(a) of the CGST Act, 2017. A bill of supply is issued when no GST is charged, either because the supply is exempt or because the supplier is on the composition scheme under Section 10. Rule 49 of the CGST Rules, 2017 prohibits showing any tax on a bill of supply. The recipient of a bill of supply cannot claim any ITC.

Can a composition dealer issue a tax invoice if the buyer specifically requests it?

No. A composition dealer under Section 10 is legally prohibited from collecting tax from the recipient and therefore cannot issue a tax invoice. The dealer must issue a bill of supply. If a buyer needs ITC, they should avoid sourcing from composition dealers.

My supplier issued a bill of supply for a taxable supply by mistake. How do I fix this before GSTR-3B?

The supplier must issue a credit note to cancel the bill of supply and then issue a correct tax invoice under Section 34(1). Do not post ITC until you hold the correct tax invoice. The correction deadline is 30 November following the end of the financial year, or the annual return filing date, whichever is earlier, per Section 34(2).

Is an export supply covered by a bill of supply or a tax invoice under GST?

A tax invoice is always required for export supplies, whether with payment of IGST or under LUT or Bond, per Rule 46 of the CGST Rules, 2017. Exports are zero rated, not exempt. For LUT exports, add the endorsement “Supply meant for export under bond or Letter of Undertaking without payment of Integrated Tax.”

Does GSTR-2B show any credit from bills of supply?

No. GSTR-2B reflects only ITC eligible documents, tax invoices and debit notes filed by the supplier in GSTR-1. Bills of supply do not generate any ITC and therefore do not appear as ITC lines in GSTR-2B. Such ITC, if booked, must be reversed before GSTR-3B.

What penalty does a supplier face for issuing a bill of supply instead of a tax invoice for a taxable supply?

Under Section 122(1)(v), the penalty is ₹10,000 or an amount equal to the tax evaded or ITC wrongly passed on, whichever is higher. Additionally, Section 125 provides a general penalty up to ₹25,000. Both can apply in document misclassification cases.

If a supplier is exempt from e-invoicing, do they still need to issue a tax invoice?

Yes. E-invoicing exemption and document type obligations are separate. Exempt from IRN generation does not mean exempt from issuing the correct document. Taxable supplies require a tax invoice, exempt supplies require a bill of supply.

How should a mixed vendor, one who supplies both taxable and exempt goods, be handled in AP?

Create two entries for each purchase, one voucher referencing the tax invoice for taxable items with ITC booked, and one voucher referencing the bill of supply for exempt items with no ITC. Maintain bill wise detail for each document to ensure correct GSTR-2B mapping.