Last updated: | By DisyTax Team

Time of Supply of Goods Under GST: 2026 Complete Guide & Rules Explained

In the highly digitized framework of Indian taxation, managing cash flow is the ultimate priority for any business. Under the Goods and Services Tax (GST), you cannot simply pay tax whenever it is convenient. The exact moment your tax liability legally crystalizes is dictated by the time of supply of goods under GST. Miscalculating this single metric leads to delayed tax payments, severe interest charges, and heavy scrutiny from the GST department.

To successfully comply in FY 2026-27, businesses must clearly distinguish between the date an invoice is issued, the date goods are delivered, and the date payment is received. More importantly, the rules for physical goods drastically differ from the time of supply of services under GST. Understanding these GST basic terms is non-negotiable for accounting precision.

In this authoritative, expert-led guide authored by Chartered Accountants, we decode the stringent statutory provisions of Section 12 of the CGST Act. From understanding the crucial "Advances Exemption" to analyzing the Reverse Charge Mechanism (RCM) traps, this comprehensive guide provides the exact legal frameworks and real-world scenarios your business needs to ensure flawless compliance.

What is the Time of Supply of Goods in GST?

What is the time of supply of goods under GST? The time of supply of goods under GST determines the exact point in time when a commercial transaction is legally deemed to have occurred. This specific date triggers the supplier's statutory liability to calculate, declare, and pay GST to the government.

Accurately determining the time, place, and value of supply in GST dictates which month's return will reflect your tax liability. If the time of supply falls in August, the tax must be deposited with the government while filing the August return (usually by the 20th of September).

Bare Act Reference - Section 12(1) of the CGST Act, 2017:
"The liability to pay tax on goods shall arise at the time of supply, as determined in accordance with the provisions of this section."

Expert Explanation: The law is absolute. You cannot defer your tax liability to a future month just because your buyer has not paid you yet. The liability is strictly triggered based on the earliest occurrence of specific statutory events (like invoice issuance).

1. Time of Supply Under Normal Charge (Forward Charge)

What is the time of supply for goods under forward charge? For goods under forward charge, the time of supply is strictly the date of issuance of the invoice, or the last date on which the invoice should have been issued under Section 31. Advances received for goods do not trigger GST.

Originally, when GST was launched in 2017, the law stated that the time of supply was the earlier of the invoice date or the payment date. However, this caused massive compliance headaches for manufacturers receiving advance payments.

Crucial Legal Update (Notification No. 66/2017)

The government issued Notification No. 66/2017-Central Tax, which completely removed the "receipt of payment" criteria for goods under normal charge. Today, businesses do not pay GST when they receive advance payments for physical goods. The tax liability arises strictly when the GST invoice format is officially issued. (Note: This exemption applies only to goods, not services. You must still evaluate the treatment of advance received under GST carefully for service contracts).

Practical B2B & B2C Examples

Scenario	Invoice Date	Payment Date	Legal Time of Supply
Standard Sale	15th May 2026	10th July 2026	15th May 2026 (Tax payable in May GSTR-3B)
Advance Received	1st June 2026	10th May 2026	1st June 2026 (Advance is ignored for goods)
Late Invoicing	10th July 2026 (Goods delivered on 15th June)	10th July 2026	15th June 2026 (The last legal date the invoice should have been issued under Section 31)

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2. Time of Supply Under Reverse Charge Mechanism (RCM)

Under the Reverse Charge Mechanism, the supplier does not charge tax. Instead, the liability to calculate, declare, and pay tax rests entirely on the recipient (buyer). Understanding the RCM under GST applicability list is vital because the time of supply rules here are entirely different.

Bare Act Reference - Section 12(3) of the CGST Act, 2017:
"In case of supplies in respect of which tax is paid or liable to be paid on reverse charge basis, the time of supply shall be the earliest of the following dates, namely:—
(a) the date of the receipt of goods, or
(b) the date of payment as entered in the books... or debited in his bank account, or
(c) the date immediately following thirty days from the date of issue of invoice..."

The 31-Day RCM Trap

For goods purchased under RCM, the time of supply is the earliest of the following three events:

Date of physical receipt of goods.
Date of payment.
The 31st day from the date the supplier issued the invoice.

Example Scenario (RCM)

A registered business purchases raw cotton (notified under RCM) from an unregistered agriculturist.

Date of Supplier's Invoice: 1st June 2026
Date of Receipt of Goods: 15th July 2026
Date of Payment: 20th July 2026

Analysis: Since goods and payment were received late, the law looks at the 31st day from the invoice date. The 31st day is 2nd July 2026. Therefore, the Time of Supply is 2nd July 2026. The buyer must pay the RCM tax in their July GST returns, even though they paid the supplier later.

3. Time of Supply for Vouchers & Residual Rules

What is the time of supply for vouchers? If a voucher is tied to a specific product at the time of issuance, the time of supply is the date of issue. If the voucher can be used for various unidentified goods, the time of supply is the date of redemption.

Section 12(4) of the CGST Act dictates the taxation of gift cards, coupons, and vouchers.

Identifiable Supply: A store sells a voucher explicitly for "One Pair of Shoes." The tax liability arises immediately on the date the voucher is sold.
Unidentifiable Supply: A mall sells a ₹5,000 gift card that can be used for clothes, electronics, or food. Since the tax rate is unknown at issuance, the tax liability arises only on the date the customer redeems the card.

Residual Rules (Section 12(5))

If it is impossible to determine the time of supply using any of the above methods (often in cases of tax fraud or seized clandestine goods), the time of supply becomes:

The due date of the periodic return (if the taxpayer is required to file one).
The actual date the tax is paid, in all other cases.

Advanced Scenarios: Continuous Supply & Goods on Approval

Not all businesses operate on a simple "sell and deliver" model. The law provides specific invoice issuance deadlines under Section 31, which directly dictate the time of supply.

Continuous Supply of Goods

For goods supplied continuously via pipelines or cables (like natural gas or electricity), where successive statements of accounts are issued, the continuous supply of goods and services under GST rules apply. The time of supply is the date each statement is issued or the date each payment is received, whichever is earlier.

Goods Sent on Approval Basis

If you send goods to a client "on approval" (they can test it and return it if they don't like it), the invoice must be issued at the time the client accepts the goods, or exactly six months from the date of removal, whichever is earlier. Understanding the GST treatment for goods sent on approval basis prevents premature tax payments.

Common Mistakes & Compliance Risks (FY 2026-27)

During an assessment under GST, the department heavily scrutinizes invoice dates against dispatch logs. Avoid these fatal errors:

Late Invoice Issuance: Section 31 dictates that an invoice must be issued exactly at the time of removal of goods. If you dispatch goods on the 28th of the month but generate the invoice on the 2nd of the next month, the law legally pulls the time of supply back to the 28th. You will be penalized for short-payment of tax in the first month, attracting heavy GST late fees and interest.
Additions to Value (Late Fees): If you charge your customer a late fee or penalty for delayed payment, the time of supply for that specific late fee amount is the exact date you actually receive it (Section 12(6)). Do not pay GST on late fees you haven't received yet.
Ignoring RCM Liability: Purchasing goods from unregistered entities under RCM without self-invoicing within the 30-day window triggers strict actions under the GST prosecution, penalty, and procedure regulations.

Conclusion

Accurately determining the time of supply of goods under GST is the absolute bedrock of financial compliance. It dictates your cash flow, your monthly tax outflows, and your immunity against departmental audits. By recognizing that advances on physical goods are currently exempt from immediate tax, and by rigorously monitoring the 31-day trigger for RCM purchases, businesses can legally optimize their working capital.

Ensure that your accounting software is perfectly synchronized with Section 31 invoice issuance rules. Maintain impeccable accounts and records to prove exact dispatch dates. This proactive approach completely neutralizes the risk of incorrect tax payments and compounding interest charges in FY 2026-27. If you are launching a new supply chain, ensure your online GST registration accurately supports your specific operational model.

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Frequently Asked Questions (FAQs)

1. What is the time of supply of goods under GST?

The time of supply of goods under GST determines the exact point in time when a commercial transaction is legally deemed to have occurred. This specific date triggers the supplier's statutory liability to calculate, declare, and pay GST to the government.

2. What is the time of supply for goods under forward charge?

For goods under forward charge, the time of supply is strictly the date of issuance of the invoice, or the last date on which the invoice should have been issued under Section 31. Advances received for goods do not trigger GST.

3. Do I have to pay GST on advance payments received for goods?

No. Under Notification No. 66/2017-Central Tax, the government exempted businesses from paying GST at the time of receiving advances for goods. The tax liability arises only when the actual tax invoice is issued against those goods.

4. What is the time of supply under the Reverse Charge Mechanism (RCM)?

For RCM on goods, the time of supply is the earliest of three dates: the date the goods are physically received, the date the payment is made, or the 31st day from the date the supplier originally issued the invoice.

5. What is the time of supply for vouchers?

If a voucher is tied to a specific product at the time of issuance, the time of supply is the date of issue. If the voucher can be used for various unidentified goods, the time of supply is the date of redemption.

6. When should an invoice be issued for the physical movement of goods?

Under Section 31 of the CGST Act, a tax invoice must be issued exactly at or before the time of removal of goods for supply to the recipient. Generating the invoice after the goods have dispatched violates the law.

7. What is the time of supply for late fees or interest charged to a customer?

If you charge a customer extra value, such as interest or late fees for delayed payment, the time of supply for that specific additional amount is the exact date you actually receive that money in your bank account.

8. What is the time of supply for goods sent on an approval basis?

If goods are sent on an approval basis, the invoice must be issued at the time the client legally accepts the goods, or exactly six months from the date of initial removal, whichever is earlier. That date becomes the time of supply.