Invoicing & Documents

Tax invoice

Section 31, CGST Act

Chapter 7 Text as on 2026-09-05 Source CBIC

Straight from CBIC

Official source, not a summary of a summary

Full text included

Read the exact words of the law yourself

Amendment history

See what changed, and when

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In one line

Section 31 requires a TAX INVOICE – for goods, before or at removal/delivery; for services, within a prescribed period (usually 30 days). It also covers bills of supply (for exempt/composition), receipt vouchers for advances, and invoices under reverse charge, with government power to notify e-invoicing and time limits.

What this means in practice

The parts that actually decide cases — the things a practitioner checks first.

1

Goods: invoice before or at removal where the supply involves movement, otherwise at delivery. Services: within thirty days (forty-five for banks, insurers and financial institutions).

2

E-invoicing applies to taxpayers with aggregate turnover above Rs 5 crore in any year from 2017-18. A document that should have carried an Invoice Reference Number but did not is NOT a valid tax invoice under Rule 48(5) – the buyer’s credit fails with it.

3

Since 01-04-2025 an e-invoice must be reported to the Invoice Registration Portal within thirty days for taxpayers above Rs 10 crore turnover.

4

Self-invoice for a reverse-charge supply from an unregistered supplier must be issued within thirty days of receipt (Rule 47A, from 01-11-2024) – and the credit depends on it.

5

No invoice is needed for a supply below Rs 200 to an unregistered person who does not ask for one, provided a consolidated invoice is raised at the end of the day.

Questions people actually ask

Real questions we get on this provision, answered straight.

Our supplier gave a manual invoice although he is over the e-invoicing threshold. Can we take the credit?+

No. Rule 48(5) makes an invoice that was required to be an e-invoice but was not, an invalid document, and credit on it fails. Ask for a compliant e-invoice with the IRN before you pay.

How this provision is built

The skeleton, clause by clause — useful when a notice cites a specific sub-clause.

(1) A registered person supplying taxable goods shall, before or at the time of,- (a) removal of goods for supply to the recipient, where the supply involves movement of goods; or (b) delivery of goods or making available th…
(2) A registered person supplying taxable services shall, before or after the provision of service but within a prescribed period, issue a tax invoice, showing the description, value, tax charged thereon and such other parti…
(3) Notwithstanding anything contained in sub-sections (1) and (2)- (a) a registered person may, within one month from the date of issuance of certificate of registration and in such manner as may be prescribed, issue a revi…
(4) of section 9 shall 2 [, within the period as may be prescribed,] issue an invoice in respect of goods or services or both received by him from the supplier who is not registered on the date of receipt of goods or service…
(5) Subject to the provisions of clause (d) of sub-section (3), in case of continuous supply of services,- (a) where the due date of payment is ascertainable from the contract, the invoice shall be issued on or before the du…
(6) In a case where the supply of services ceases under a contract before the completion of the supply, the invoice shall be issued at the time when the supply ceases and such invoice shall be issued to the extent of the sup…
(7) Notwithstanding anything contained in sub-section (1), where the goods being sent or taken on approval for sale or return are removed before the supply takes place, the invoice shall be issued before or at the time of su…

The exact words of the law

5,357 characters, unedited

Reproduced from the CBIC text. We explain it above — but you should always be able to read it yourself.

Read the full provision+
Section 31 * Section 31. Tax invoice.-

(1) A registered person supplying taxable goods shall, before or at the time of,-
(a) removal of goods for supply to the recipient, where the supply involves movement of goods; or
(b) delivery of goods or making available thereof to the recipient, in any other case, issue a tax invoice showing the description, quantity and value of goods, the tax charged thereon and such other particulars as may be prescribed : Provided that the Government may, on the recommendations of the Council, by notification, specify the categories of goods or supplies in respect of which a tax invoice shall be issued, within such time and in such manner as may be prescribed.

(2) A registered person supplying taxable services shall, before or after the provision of service but within a prescribed period, issue a tax invoice, showing the description, value, tax charged thereon and such other particulars as may be prescribed: 1 [ Provided that the Government may, on the recommendations of the Council, by notification,-
(a) specify the categories of services or supplies in respect of which a tax invoice shall be issued, within such time and in such manner as may be prescribed ;
(b) subject to the condition mentioned therein, specify the categories of services in respect of which-
(i) any other document issued in relation to the supply shall be deemed to be a tax invoice; or (ii) tax invoice may not be issued.]

(3) Notwithstanding anything contained in sub-sections

(1) and (2)-
(a) a registered person may, within one month from the date of issuance of certificate of registration and in such manner as may be prescribed, issue a revised invoice against the invoice already issued during the period beginning with the effective date of registration till the date of issuance of certificate of registration to him;
(b) a registered person may not issue a tax invoice if the value of the goods or services or both supplied is less than two hundred rupees subject to such conditions and in such manner as may be prescribed;
(c) a registered person supplying exempted goods or services or both or paying tax under the provisions of section 10 shall issue, instead of a tax invoice, a bill of supply containing such particulars and in such manner as may be prescribed : Provided that the registered person may not issue a bill of supply if the value of the goods or services or both supplied is less than two hundred rupees subject to such conditions and in such manner as may be prescribed;
(d) a registered person shall, on receipt of advance payment with respect to any supply of goods or services or both, issue a receipt voucher or any other document, containing such particulars as may be prescribed , evidencing receipt of such payment;
(e) where, on receipt of advance payment with respect to any supply of goods or services or both the registered person issues a receipt voucher, but subsequently no supply is made and no tax invoice is issued in pursuance thereof, the said registered person may issue to the person who had made the payment, a refund voucher against such payment;
(f) a registered person who is liable to pay tax under sub-section

(3) or subsection

(4) of section 9 shall 2 [, within the period as may be prescribed,] issue an invoice in respect of goods or services or both received by him from the supplier who is not registered on the date of receipt of goods or services or both;
(g) a registered person who is liable to pay tax under sub-section

(3) or subsection

(4) of section 9 shall issue a payment voucher at the time of making payment to the supplier. 2 [Explanation .––For the purposes of clause (f), the expression “supplier who is not registered” shall include the supplier who is registered solely for the purpose of deduction of tax under section 51.]

(4) In case of continuous supply of goods, where successive statements of accounts or successive payments are involved, the invoice shall be issued before or at the time each such statement is issued or, as the case may be, each such payment is received.

(5) Subject to the provisions of clause
(d) of sub-section (3), in case of continuous supply of services,-
(a) where the due date of payment is ascertainable from the contract, the invoice shall be issued on or before the due date of payment;
(b) where the due date of payment is not ascertainable from the contract, the invoice shall be issued before or at the time when the supplier of service receives the payment;
(c) where the payment is linked to the completion of an event, the invoice shall be issued on or before the date of completion of that event.

(6) In a case where the supply of services ceases under a contract before the completion of the supply, the invoice shall be issued at the time when the supply ceases and such invoice shall be issued to the extent of the supply made before such cessation. **

(7) Notwithstanding anything contained in sub-section (1), where the goods being sent or taken on approval for sale or return are removed before the supply takes place, the invoice shall be issued before or at the time of supply or six months from the date of removal, whichever is earlier. Explanation .-For the purposes of this section, the expression "tax invoice" shall include any revised invoice issued by the supplier in respect of a supply made earlier.

What changed, and when

The amendment trail, newest first — because the version that applies to your case depends on the period.

date not stated · Substituted

92/2020-C.T.

Substituted for the proviso " Provided that the Government may, on the recommendations of the Council, by notification and subject to such conditions as may be …

date not stated · Inserted

Inserted by section 122 of The Finance Act (No. 2) Act, 2024 No. 15 of 2024 dated 16.08.2024.

Read this with

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Where this comes from

Text reproduced from the Central Board of Indirect Taxes and Customs, as available on 2026-09-05. The explanation and practice notes above are GSTZone’s own, written for this hub. If you spot anything out of date, tell us and we’ll fix it — this hub is checked daily against CBIC.

tax invoicesection 31gst invoice rulese-invoice

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