Corporate wants ITC on air tickets: put its GSTIN on the PNR

A corporate client books close to thirty flights a month through your agency, then asks for "the GST bill" so its accounts team can claim input tax credit. If the company's GSTIN was on the PNR before you issued the ticket, the airline invoices the company directly. If not, the e-ticket in the traveller's name is the invoice, and the credit the client was counting on isn't there.

This trips up corporate accounts often: the GSTIN goes in at one moment, booking, and IndiGo and SpiceJet won't let you add it afterward. Below: the fields to collect before ticketing, which carriers still let you fix a missed GSTIN, your service-fee invoice, and a tracker to keep every PNR honest against GSTR-2B.

Why the client's GSTIN has to be on the PNR before you ticket

The airline's tax invoice follows whatever GSTIN was entered at booking, not what the client asks for afterward. IndiGo's GST page and SpiceJet's page both say GST details go in only before the PNR is generated, and a GSTIN once submitted can't be changed after confirmation. Air India is the one carrier of the three with a real door afterward: its GST.AI FAQ allows a website edit within 48 hours, then a GST.AI amendment, which needs Air India's approval when an agent adds the GSTIN.

Miss the window and the ticket is still a valid invoice, just not one your client can claim on. Under Rule 54(4) and Rule 46(d) of the CGST Rules, a ticket in any form counts as the tax invoice for passenger transport, with or without the recipient's address, but it must carry the other Rule 46 particulars, which include the recipient's name and GSTIN if registered. Rule 36(2)'s proviso allows ITC on a document missing some particulars only if it still carries, among other details, the GSTIN of both supplier and recipient. An e-ticket in the employee's name, with no company GSTIN, fails that test.

That costs real money. Section 16(2)(aa) of the CGST Act and Rule 36(4) of the CGST Rules block the credit until the airline has reported the invoice and it shows up in the client's GSTR-2B. The credit itself is real: Section 16(1) and the Explanation to Section 16(2)(b) of the CGST Act let a registered company claim credit on an employee's business flight, since a service provided to any person on the company's direction and on its account counts as received by the company. The credit is there to be had; it just depends on the right GSTIN sitting on the PNR.

What a missed GSTIN costs the client: one month, worked out

Example: Say a GST-registered client books 28 domestic sectors through you in a month: 24 economy at a taxable value of ₹6,000 each (off the airline's invoice, not the all-in fare) and 4 business-class at ₹30,000 each. From 22 September 2025, air travel is taxed at 5% in economy and 18% in any other class (PIB's FAQ on the 56th GST Council, as of October 2026). Economy GST: 24 × ₹6,000 × 5% = ₹7,200. Business GST: 4 × ₹30,000 × 18% = ₹21,600. Total ₹28,800, claimable only once it lands in GSTR-2B. You earned ₹250 a sector, ₹7,000 in fees. Miss the GSTIN on every PNR, with no fix available, and the client loses ₹28,800 that month, 4.1 times your fees; twelve similar months, roughly ₹3,45,600 a year.

The GST capture card: five fields to collect before ticketing

Copy this once per client, per GST registration it wants billed:

GST DETAILS FOR AIRLINE INVOICES
(fill once per company, per state GST registration)

1. Legal name: ________________________________________
   (exactly as on the GST certificate)
2. GSTIN: ______________________________________________
   (15 characters, capital letters)
3. Registered address of this GSTIN: __________________
4. E-mail for GST invoices: ____________________________
   (accounts inbox, not the traveller's personal e-mail)
5. Contact number: _____________________________________

Before you ticket, confirm:
- GSTIN and legal name verified on the GST portal, date checked: ______
- This is the state registration that should carry this traveller's cost
- This is a business trip, not leave or holiday travel

The five fields mirror what Air India's GST.AI FAQ asks for, which its agents record in the SSR segment against the booking reference. IndiGo and SpiceJet ask agents for at least the GSTIN, the customer's name and the company's e-mail at booking.

Verify GSTIN and legal name on the GST portal's Search Taxpayer tool first; IndiGo admits it can't validate a GSTIN at booking, so that check sits with you. The state registration matters too: under the IGST Act's place-of-supply rule, passenger transport to a registered person is supplied at that person's location, so the GSTIN on the PNR sets the place of supply and, with it, whether the airline charges IGST or CGST plus SGST. Confirm it's a business trip too: Section 17(5)(b)(iii) blocks credit on travel benefits for employees on vacation, such as leave or home travel concession; business travel isn't on that list.

Send this once to accounts:

Hi [Name], for GST credit on flight bookings, share five details per GST
registration you want billed: legal company name, GSTIN, address, the
e-mail accounts wants GST invoices on, and a contact number. Airlines
take these at booking, and some won't let us add them later.

Run this before you click issue:

• GST fields entered in the booking flow, before the ticket is issued
• Agency's own GSTIN is NOT in that field
• GST e-mail is the client's accounts inbox, not the traveller's
• PNR, ticket number and GSTIN used noted on the booking record
• For Air India, re-check within 48 hours

Never put your agency's GSTIN on a client's ticket

IndiGo's clarification on GST numbers says the invoice goes to whoever's GST number was given at booking, that IndiGo can't validate that number, and that if an agent enters its own GSTIN "for customer support and coordination purposes," the invoice is issued to the agent, with any loss of credit to the end customer being the agent's responsibility. It applies to tickets issued from 1 July 2017.

In plain terms: your GSTIN on a client's ticket puts the invoice in your own GSTR-2B, not theirs, and there's no clean way to pass that credit on afterward. Treat it as a CA question if it's already happened. On Air India, the lever is the GST.AI amendment described above: agents can add or delete the GSTIN on invoices for their own bookings, subject to Air India's approval. Elsewhere, check the carrier's own page.

Forgot the GSTIN: what can still be fixed, carrier by carrier

As of October 2026:

Carrier	Add GSTIN after the PNR?	Route
IndiGo	No	Entered before the PNR is generated; locked once confirmed
SpiceJet	No	Same: before the PNR only
Air India	Yes, within limits	Website edit within 48 hours; then GST.AI amendment with approval
Any other carrier	Not verified here	Check that carrier's own GST page before promising a fix

Even where a fix is possible, the window isn't open-ended. Sections 16(4), 37(3) and 34(2) of the CGST Act draw the same line: no credit, no GSTR-1 rectification and no credit note declared after 30 November following the FY end, or the annual return, whichever is earlier (30 November 2027 at the latest for a FY 2026-27 ticket). Air India adds an earlier date of its own for one related step: its GST.AI sign-in page cites Section 34 to say refund of GST, which it labels "K3", won't be allowed after 31 October for tickets issued in the previous financial year. That's Air India's cut-off for K3 refunds, not the statutory date, and the page doesn't say it also limits GSTIN amendments.

Your own service-fee invoice: the one you do issue

The airline's invoice is never yours to raise. The one you do issue is your own service-fee invoice, and it needs the same GSTIN. For a registered client, place of supply is the client's location under Section 12(2)(a) of the IGST Act, so a client registered in a different state gets an IGST invoice from you.

Charge 18% on the fee itself, or on the Rule 32(3) deemed value of 5%/10% of the basic fare, if your agency uses that option; what "basic fare" means is in the agent's own GST rules on flight tickets. Report it as B2B in GSTR-1 (or IFF, if you file quarterly), against the client's GSTIN; that's how it reaches their GSTR-2B. If it stops showing up there anyway, that's covered in corporate GSTR-2B payment-hold.

The monthly GST invoice tracker

Keep one row per PNR across the month, CSV-style rather than a table, which needs more columns than a phone screen can hold:

Travel date, Traveller, PNR, Ticket no., Airline, Cabin (economy/other),
Client GSTIN used, Airline invoice received (Y/N, date), Our fee invoice
no., In client's GSTR-2B (Y/N, month), Action/owner

Four steps every month:

1. Pull airline invoices: Air India's under "Booking for" on GST.AI, IndiGo and SpiceJet from the booking e-mail.
2. Send accounts the full pack, airline invoices plus your own fee invoice, in one e-mail.
3. Ask the client to confirm which lines show up in GSTR-2B after the 14th of the next month (Rules 59 and 60 of the CGST Rules tie it to the day after the later of the GSTR-1 and IFF due dates, the 14th in practice).
4. Chase whatever is missing while the fix window above is still open, not after.

Between the airline's GSTR-1 and the client's GSTR-2B sits the client's own accept, reject or keep-pending choice in IMS. Don't plan around the next change yet: on 8 October 2026 the 57th GST Council recommended writing that IMS choice into the GSTR-2B rules as part of a returns package it suggested bringing in from the April 2027 return. That's a recommendation, not law, as of October 2026.

Common questions

Can I add GST details after booking an IndiGo flight?

No. IndiGo's GST page says GST details can be entered only before the PNR is generated, and a GSTIN once submitted can't be changed afterward.

Flight ticket ka GST bill company ke naam kaise milega?

Enter the company's GSTIN at booking, before the PNR is created. If missed, check the carrier's GST page: Air India allows a website edit within 48 hours, then a GST.AI amendment; IndiGo and SpiceJet allow nothing once the PNR exists.

Can a company claim ITC on an economy-class ticket?

Yes, for business travel, if the GSTIN is on the invoice and it reaches GSTR-2B. Any input-credit restriction tied to the airline's 5% rate limits the airline's own credit, not the buyer's, and nothing in Section 17(5) blocks a business claiming GST on business travel.

Why does the airline invoice show IGST for one leg and CGST+SGST for another?

Place of supply for a registered recipient is that person's own location under the IGST Act; for an unregistered recipient it's the point of embarkation. The same client can see IGST on one sector and CGST+SGST on another, depending on the GSTIN used and each leg's starting point.

What is the K3 line on the airline ticket?

It's the GST: Air India's GST portal labels GST on a ticket as "K3". Don't try to recompute it from the fare; read the amount off the airline's invoice.

The short version

• The airline's invoice follows the GSTIN entered at booking. IndiGo and SpiceJet allow no addition afterward; Air India gives a 48-hour window, then a GST.AI amendment.
• A missing GSTIN doesn't void the ticket, it just makes it a bill the company can't claim credit on, unless the carrier lets you fix it.
• Collect legal name, GSTIN, address, GST e-mail and contact number per state registration, and verify on the GST portal's Search Taxpayer tool.
• Never put your own agency's GSTIN on a client's ticket; IndiGo says in writing the loss of credit is the agent's responsibility.
• The statutory outer limit is 30 November after the FY ends (or the annual return, if earlier). Air India's own 31 October cut-off covers K3 (GST) refunds.
• Your own service-fee invoice needs the client's GSTIN too, reported as B2B in GSTR-1, separate from the airline's.
• Track every PNR to GSTR-2B monthly; rules change, so confirm current rates and carrier policies with your CA before any filing.