Sweetie has been baking cakes for 8 years. Last year she crossed ₹50L and got a GST number. She charged 18% on her cakes and paid GST every month — until her cousin asked, "Hold on, are you claiming ITC on the flour and oil you buy?"
She wasn't. She'd been double-paying for two years. Let's fix this.
- ITC = GST you paid on purchases, which you can offset against GST you collected on sales.
- Net GST you pay = output GST (on sales) − ITC (on purchases).
- 4 conditions: valid invoice + goods/services received + tax paid by vendor + your GSTR-3B filed.
- Blocked under Sec 17(5): most motor vehicles, food & beverages, club memberships, personal-use goods.
- Strict rule: it must match your GSTR-2B. No match = no credit.
Sweetie's bakery math, with and without ITC
In one month:
👉 Bought flour, oil, packaging worth ₹1,00,000 + ₹18,000 GST = ₹1,18,000
👉 Sold cakes worth ₹2,00,000 + ₹36,000 GST = ₹2,36,000
Without ITC
What Sweetie did for 2 years
She paid ₹36,000 to govt. Her supplier already paid ₹18,000. Govt collected ₹54,000 on the same value chain. Double tax.
With ITC
How GST is supposed to work
She offsets the ₹18,000 she already paid. Net cash to govt = ₹36,000 − ₹18,000 = ₹18,000. Total in chain = ₹36k. Fair.
That's why ITC exists. GST is meant to be 18% on the value added, not 18% stacked on every link of the chain. ITC is the mechanism.
The 4 conditions for claiming ITC
Vendor's invoice must show their GSTIN, your GSTIN, taxable value, tax rate, tax amount, HSN code. No proper invoice = no credit.
Paper invoices without delivery don't qualify. For services delivered over time, partial ITC as the work accrues.
You only get ITC when your vendor has filed their GSTR-1 and the invoice shows up in your GSTR-2B. This is the famous "vendor compliance" problem.
ITC is claimed via Table 4 of GSTR-3B. Must be claimed within the same FY or by GSTR-3B of November of next FY, whichever is earlier.
What you CAN'T claim — blocked credits (Sec 17(5))
The big "no" list:
- Motor vehicles — except if you're in vehicle trading, transport, or driving school
- Food & beverages, outdoor catering, beauty, health services — unless used to make same-category outward supplies
- Club / gym / health-centre memberships
- Rent-a-cab, life insurance, health insurance — unless mandated by law or same-category supplies
- Personal-use goods / services
- Goods lost, stolen, written off, gifted, sampled
- Construction of immovable property for own use (other than plant & machinery)
The monthly ITC routine
Every month, around the 14th, your GSTR-2B auto-generates. It's the system's view of what ITC you can legally claim, pulled from your vendors' GSTR-1 uploads.
Your job is to compare it against your purchase register:
👉 Invoice in books + in 2B → claim it.
👉 Invoice in books, missing from 2B → vendor hasn't filed. Chase them. Defer the ITC to next month.
👉 Invoice in 2B, not in your books → verify it's actually yours. Sometimes a vendor enters a wrong GSTIN.
From Jan 2022, you can only claim ITC that appears in your GSTR-2B. Earlier there was a 5% / 10% provisional buffer. Now zero. If vendor hasn't uploaded, you can't claim — even with a perfect invoice and full payment.
The vendor problem — and how to handle it
The harshest part of GST: your tax credit depends on someone else's discipline. If your vendor doesn't file their GSTR-1 or doesn't pay GST to govt, you lose ITC even with a perfect invoice.
What sensible businesses do:
👉 Pick vendors with GST track records (check on GST portal — file history is public)
👉 Hold a portion of payment (often 10%) until the invoice reflects in your 2B
👉 Use vendor-rating workflows in your accounting tool — repeat offenders move to "no further orders"
👉 For big-ticket purchases, ask for a written GST-filing undertaking
Reverse Charge Mechanism (RCM) — when YOU pay GST
In some cases, the buyer (you) pays GST instead of the seller. Common scenarios:
- Import of services
- Goods Transport Agency (GTA) services
- Legal services from advocates / firms
- Director's sitting fees
- Insurance / banking / business correspondents (specific cases)
For RCM: you self-invoice, pay GST in cash, then claim it back as ITC (if eligible). RCM tax must be paid in cash — can't offset with existing ITC.
The order in which ITC gets used
From 1 Feb 2019, you must use ITC in this sequence:
👉 IGST credit first — against IGST, then CGST, then SGST liability
👉 CGST credit — only against CGST and IGST liability
👉 SGST credit — only against SGST and IGST liability
Translation: don't let IGST credit pile up. Use it first or you can end up with cash payable on CGST/SGST while IGST credit sits idle.
GST isn't "18% on sales". It's "18% on value added". ITC is the mechanism that makes it so. Master ITC and you've mastered GST.
Quick answers
Yes, if used for business. Full ITC available in the month of purchase. For motor vehicles, restrictions apply under Sec 17(5).
You can claim only when the invoice appears in your GSTR-2B. If the vendor files late, the invoice shows up in a later month's 2B — claim it then. ITC isn't lost, just deferred.
Yes, but only until 30th November of the next FY or filing of GSTR-9 for that FY, whichever is earlier. After that window, ITC is permanently lost.
Composition vendors can't issue tax invoices — they issue "bills of supply". You can't claim ITC on those purchases. Factor that into your vendor mix.
If you make both taxable and exempt supplies, ITC is restricted proportionally (Rules 42 / 43). Common in mixed-use real estate, education, healthcare.
When you might want help
Claiming ITC right is the single highest-leverage GST activity. Where it pays off most: monthly 2B reconciliation (15 minutes well spent), chasing late vendors before the year-end ITC window closes, and the complex rules around RCM, Rules 42/43, blocked credits — these are easy to get wrong and expensive when you do.
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We match every invoice to GSTR-2B, chase late vendors, optimise your tax outflow. Fixed monthly fee.