Section 21 of IGST explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.
Section 21 of the IGST Act, 2017 is a transitional provision. It provides that where a service is imported on or after the appointed day (1 July 2017), integrated tax is payable on it even if a part of the consideration was paid before that date. The tax is generally payable by the recipient in India under the reverse charge mechanism. A concession applies only to the extent the transaction was already taxed under the earlier service-tax law.
What Section 21 Says — In Plain English
When GST replaced the earlier indirect-tax regime on 1 July 2017, cross-border transactions straddling the changeover needed clear rules. In plain English, Section 21 says: if you receive a service from abroad after GST started, you pay IGST on it — even if you had already paid part of the price before GST — but you do not pay twice on any portion that already suffered service tax under the old law.
The section provides that import of services made on or after the appointed day shall be liable to integrated tax regardless of whether the transaction was initiated before the appointed day. Its proviso says that if the tax on such import had already been paid in full under the earlier law (service tax), no IGST is payable; and if the tax was paid only in part, the balance is liable to IGST. The Explanation deems a transaction to be initiated before the appointed day if either the invoice was issued or the payment was made, wholly or partly, before that day. The guiding principle is that services consumed in the GST era are taxed under GST, while any portion already taxed under the old law is not taxed again.
Clause / Sub-section Breakdown
- Main charge: Import of services made on or after 1 July 2017 is liable to IGST, even if the transaction was initiated earlier.
- Proviso — full tax paid earlier: If service tax was paid in full under the earlier law on that import, no IGST is payable.
- Proviso — part tax paid earlier: If service tax was paid only in part, the balance (the untaxed portion) is liable to IGST.
- Explanation — "initiated before": A transaction is deemed initiated before the appointed day if the invoice was issued or payment made, wholly or partly, before 1 July 2017.
Applicability & Scope
Section 21 applies to imports of services — where the supplier is located outside India and the recipient is in India — that are made on or after 1 July 2017 but where the arrangement or part payment began earlier. It works together with the reverse charge mechanism, under which the Indian recipient pays the IGST, and with the transitional provisions to avoid both double taxation and escape from tax. It is essentially a one-time bridging rule for the GST changeover, though it still governs any straddling transaction from that period.
The design problem Section 21 solves is a classic transitional one. Long-running service arrangements — consultancy engagements, licensing of intellectual property, ongoing technical support — often span the changeover date, with money changing hands both before and after 1 July 2017. Under the old service-tax regime, tax was pegged to the point of taxation (broadly the earliest of invoice or payment); under GST, the charge attaches to the supply and its time of supply. Left unaddressed, a straddling import of service could either be taxed twice (once under service tax on the advance and again under GST on the same value) or slip through untaxed. Section 21 draws a clean line: the portion of the service that had already borne service tax stays taxed under the old law and is not disturbed, while the portion that is effectively consumed and paid for in the GST era is brought to IGST. The Explanation's "initiated before" test — invoice issued or payment made, wholly or partly, before the appointed day — is the trigger that identifies these straddling transactions in the first place.
Worked Examples
Example 1 — Part advance pre-GST. An Indian company engaged a foreign consultant for a project worth ₹10,00,000. It made an advance of ₹4,00,000 in June 2017 (before GST) on which service tax was paid, and the service was received and the balance ₹6,00,000 paid in August 2017. Under Section 21, the portion already taxed under service tax (₹4,00,000) is not taxed again, but IGST at 18% is payable under reverse charge on the balance ₹6,00,000 — that is ₹1,08,000.
Example 2 — No pre-GST tax. An Indian firm imports software support worth ₹2,00,000 in August 2017, having issued no pre-GST invoice and paid nothing before 1 July 2017. The whole ₹2,00,000 is liable to IGST at 18% under reverse charge — ₹36,000 — as the entire import occurred in the GST era.
| Particular | Amount (₹) |
|---|---|
| Advance paid pre-GST (service tax paid) | 4,00,000 |
| Balance in GST era | 6,00,000 |
| IGST at 18% on balance (reverse charge) | 1,08,000 |
Step-by-Step in Practice
- Determine whether the import of service was made on or after 1 July 2017.
- Identify how much of the consideration, if any, already bore service tax under the earlier law.
- Exclude the already-taxed portion; apply IGST to the untaxed balance.
- Pay the IGST under reverse charge as the Indian recipient.
- Claim input tax credit of the IGST paid, subject to eligibility conditions.
Common Mistakes & Practical Notes
- Double-taxing a portion that already suffered service tax under the earlier law — the proviso excludes it.
- Assuming a pre-GST advance escapes GST entirely — only the already-taxed portion is spared; the balance is liable.
- Forgetting that IGST on import of services is paid by the recipient under reverse charge, not by the foreign supplier.
- Misjudging when a transaction is "initiated" — either issuing the invoice or making payment (wholly or partly) before 1 July 2017 counts.
- Overlooking that the reverse-charge IGST is generally creditable, subject to eligibility conditions.
Related Sections
Section 5(3) and 5(4) of the IGST Act (reverse charge on import of services), Section 2(11) of the IGST Act (definition of import of services), Section 7(4) of the IGST Act (import of services deemed inter-State), and the transitional provisions of Section 142 of the CGST Act.
Recent Amendments & Context
Section 21 is a transitional bridge tied to a fixed date (1 July 2017), so it has not been amended in substance — its relevance has naturally receded as pre-GST straddling transactions have been settled and time-barred. However, the broader treatment of import of services it interacts with has evolved: the reverse-charge framework under Section 5(3)/5(4) and the definition of import of services have been the subject of clarifications, and litigation on services like intra-group support and reimbursements has shaped how "import of services" is understood. The enduring principle from Section 21 — tax the consumption that happens under GST, and never tax the same value twice across the two regimes — remains the reference point for any residual transitional dispute.
A particularly litigated area adjacent to Section 21 has been the taxability of services received from a foreign head office or group company. The question of whether such intra-entity flows amount to an "import of services" at all — and if so, how they are valued under reverse charge — has generated significant controversy, with clarifications issued to narrow the exposure where a full input tax credit is available to the recipient. While these developments concern the ongoing reverse-charge regime rather than the transitional rule as such, they matter to any legacy import that straddled the changeover, because the same conceptual building blocks — supplier outside India, recipient in India, reverse-charge liability, and creditability of the tax paid — apply. For businesses, the residual lesson from Section 21 is documentary: where an old cross-border service engagement spanned 1 July 2017, the ability to prove exactly what value bore service tax before the date, and what was consumed and paid afterwards, is what determines the correct one-time IGST charge and protects against a demand alleging under-payment on the GST-era portion.
Key Facts About Section 21 of IGST
- Applies in: All states across India, under the relevant central law.
- Mode: Mostly online via the official government portal.
- Typical timeline: Ranges from a few days to a few weeks depending on the case.
- Non-compliance: May attract penalties, interest or late fees.
- Expert help: TaxClue completes the entire process end to end for you.
What does Section 21 of the IGST Act address?
It is a transitional provision making the import of services on or after 1 July 2017 liable to IGST, even where part of the consideration was paid before that date.
Who pays IGST on import of services under Section 21?
The recipient in India generally pays the IGST under the reverse charge mechanism.
Over 90% of compliance penalties in India arise from missed due dates — timely handling can save businesses thousands of rupees each year.
Section 21 of IGST: a key compliance topic in Indian tax and corporate law that businesses and individuals must understand to remain compliant.
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