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GST Compliance Guide — 2026
Input Tax Credit (ITC) — Claims, Conditions, Reversals & Blocked Credits
A complete, practical guide to claiming ITC correctly, understanding when it must be reversed, which credits are permanently blocked under Section 17(5), and how to reconcile ITC with GSTR-2B to avoid interest and penalties.
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Fundamentals
What Is Input Tax Credit (ITC) Under GST?
Input Tax Credit (ITC) is the mechanism under GST that allows a registered business to deduct the GST paid on purchases (inputs, input services, and capital goods) from the GST collected on sales (output tax). Only the net difference — output tax minus ITC — is deposited to the government. This eliminates the cascading effect of tax on tax that existed under the pre-GST regime.
ITC is the single most powerful tool in GST for reducing effective tax outflow. A business that correctly claims all eligible ITC pays significantly less tax than one that does not — while one that incorrectly claims ineligible ITC faces interest at 18% per annum plus penalties.
Getting ITC right is therefore not just a compliance exercise. It is a direct lever on your business's working capital and profitability.
GST Payable Formula
Net GST Payable = Output Tax Collected − Input Tax Credit (ITC)
If ITC exceeds output tax, the balance accumulates as an electronic credit ledger balance — refundable in certain cases.
ITC is governed by Sections 16 to 21 of the CGST Act, 2017, read with Rules 36 to 45 of the CGST Rules, 2017. These provisions define eligibility, conditions, restrictions, and reversal requirements in detail.
Eligibility
Conditions to Claim ITC — Section 16 of the CGST Act
All four conditions under Section 16(2) must be satisfied simultaneously before ITC can be claimed. Failing even one disqualifies the claim entirely.
- Valid Tax Invoice or Debit Note: The taxpayer must hold a tax invoice, debit note, bill of entry, or other prescribed document issued by a registered supplier.
- Goods or Services Received: The goods must have been actually received, or the services actually rendered. ITC on goods received in instalments is available only on receipt of the last instalment.
- Tax Paid by Supplier: The tax charged by the supplier must have actually been paid to the government — either in cash or through the supplier's own ITC adjustment. This is verified via GSTR-2B reconciliation.
- GST Return Filed: The taxpayer must have filed their GST return (GSTR-3B). ITC is reflected and claimable only after the return for the period is filed.
- Invoice Reflected in GSTR-2B: From January 2022, ITC can only be claimed to the extent it appears in the auto-generated GSTR-2B statement. Excess claims are not permitted and attract interest.
- Payment to Supplier Within 180 Days: If payment is not made to the supplier within 180 days of the invoice date, the ITC claimed must be reversed along with interest. It can be reclaimed once payment is made.
Who Cannot Claim ITC?
Composition dealers under the GST Composition Scheme cannot claim ITC. Businesses registered only for making exempt supplies also cannot claim ITC. Persons paying tax under Section 10 (composition) are specifically excluded from ITC provisions.
Types of ITC
Types of Input Tax Credit Under GST
ITC is classified based on the nature of the inputs on which tax has been paid:
📦
ITC on Inputs
Tax paid on raw materials, consumables, and goods used directly in the production or supply of taxable goods or services. Fully claimable in the period of receipt.
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ITC on Input Services
Tax paid on services procured for business use — professional fees, software subscriptions, freight, marketing services, etc. Claimable in the period when the service invoice is received and the tax is paid by the supplier.
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ITC on Capital Goods
Tax paid on machinery, equipment, computers, and other capital assets used for business purposes. ITC is available fully and immediately — not spread over the life of the asset (unlike pre-GST CENVAT rules). Proportionate reversal applies if used for exempt supplies.
🔄
ITC on IGST (Imports)
IGST paid on imported goods and services (as per the bill of entry) is available as ITC. This is a significant benefit for import-intensive businesses, eliminating the old countervailing duty credit complexities.
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Transitional ITC
ITC carried forward from pre-GST returns (Excise, VAT, Service Tax) was claimable in the transition period under TRAN-1 and TRAN-2 forms. This window is now closed — only historical records are relevant.
📨
ITC via ISD
Input Service Distributor (ISD) is a mechanism for head offices to distribute ITC of common input services to branch offices or units, in proportion to their turnover.
Step-by-Step Process
How to Claim ITC in GSTR-3B — Step by Step
ITC is claimed in Table 4 of GSTR-3B every month or quarter. Here is the complete process:
Download GSTR-2B for the Tax Period
Log in to gst.gov.in → Services → Returns → Returns Dashboard → Select period → Download GSTR-2B. This auto-drafted statement (generated on the 14th of each month) shows all ITC available based on your suppliers' GSTR-1 filings.
GSTR-2B is a static document — it does not change after the 14th. ITC for invoices uploaded by suppliers after the 14th will appear in the next month's GSTR-2B.Reconcile GSTR-2B with Your Purchase Register
Match every invoice in GSTR-2B against your internal purchase register. Identify: (a) invoices in GSTR-2B but not in your records — confirm receipt before claiming, (b) invoices in your records but not in GSTR-2B — contact the supplier to file their GSTR-1 and do not claim ITC until it appears.
Claiming ITC beyond what appears in GSTR-2B attracts interest at 18% per annum from the date of filing. Never claim excess ITC.Check Eligibility of Each Invoice
Before entering any ITC, verify each invoice: Is the supplier GST-registered? Are the goods or services used for business purposes? Are they blocked under Section 17(5)? Is payment expected within 180 days? Only proceed if all checks pass.
Open GSTR-3B → Table 4 (Eligible ITC)
Go to Returns Dashboard → GSTR-3B → Prepare Online. Navigate to Table 4: Eligible ITC. You will see the following sub-tables:
4(A)(1) — ITC on imports of goods
4(A)(2) — ITC on imports of services
4(A)(3) — ITC on inward supplies liable to reverse charge (RCM)
4(A)(4) — ITC received from ISD
4(A)(5) — All other ITC (regular domestic purchases)Enter ITC Figures Split by IGST, CGST, SGST
Enter the total eligible ITC under each sub-table, split correctly between Integrated GST (IGST), Central GST (CGST), and State GST (SGST/UTGST). Enter any reversals in Table 4(B). The portal auto-calculates Net ITC = 4(A) minus 4(B).
IGST ITC can be used to offset IGST, CGST, and SGST liabilities — in that order. CGST ITC can offset CGST and IGST only. SGST ITC can offset SGST and IGST only. Cross-utilisation between CGST and SGST is not allowed.File GSTR-3B and Download ARN
After entering all ITC and verifying output tax liability in Table 3, pay any net tax from the cash ledger. File GSTR-3B using EVC (OTP on registered mobile) or DSC (mandatory for companies and LLPs). Download the ARN confirmation for your records.
Section 17(5)
Blocked Credits Under Section 17(5) — ITC You Cannot Claim
Section 17(5) of the CGST Act permanently blocks ITC on specific categories of goods and services, regardless of whether they are used for business purposes. These are called blocked credits and must never be entered in Table 4 of GSTR-3B.
❌ ITC Blocked — Cannot Claim
- Motor vehicles for passenger transport (capacity ≤ 13 persons), motorcycles — unless used for further supply, transportation of passengers, or driving school
- Food, beverages, outdoor catering, beauty treatments, health services, cosmetic or plastic surgery
- Membership of clubs, health clubs, and fitness centres
- Travel benefits (leave travel allowance) to employees
- Works contract services for construction of immovable property (other than plant and machinery)
- Goods and services used in construction of immovable property on own account
- Goods or services for personal consumption of employees
- Goods lost, stolen, destroyed, written off, or disposed as gift or sample
- Tax paid under composition scheme by supplier
✓ Exceptions — ITC Allowed Despite 17(5)
- Motor vehicles used for transportation of goods
- Motor vehicles used for supply of transportation of passengers (taxi operators, bus operators)
- Motor vehicles used for imparting training on driving
- Vehicles used by the business for test drives (car dealers)
- Food and beverages supplied as part of the taxable service (restaurants, caterers)
- Works contract services for plant and machinery (not for construction of building)
- Health insurance mandatory for employees under any law
- Food provided to employees mandatory under any law
Practical Impact: If your business erroneously claims blocked ITC and it is detected in a GST audit or scrutiny, you will be required to reverse the full amount with interest at 18% per annum from the date of the wrong claim, plus a penalty of 10% of tax or ₹10,000 — whichever is higher.
ITC Reversal
When Is ITC Reversal Required?
ITC reversal means paying back ITC that was correctly claimed earlier but must now be returned because a subsequent event disqualifies it. Reversals are reported in Table 4(B) of GSTR-3B.
| Situation Requiring Reversal | Legal Provision | When to Reverse |
|---|---|---|
| Payment not made to supplier within 180 days of invoice date | Section 16(2)(b) proviso | In the GSTR-3B of the month in which 180 days expire |
| Goods or services used partly for exempt supplies | Rule 42 | Monthly, based on proportionate formula |
| Capital goods used partly for exempt supplies | Rule 43 | Monthly, over the useful life of the asset (60 months) |
| Goods destroyed, lost, stolen, or written off | Section 17(5)(h) | In the period when the loss / write-off occurs |
| Credit note issued by supplier (purchase returns) | Section 34 | In the period when credit note is received and accepted |
| Business ceases — GST registration cancelled | Section 18(4) | In the final return (GSTR-10) or cancellation period |
| Switch from regular to composition scheme | Section 18(4) | Day before the switch becomes effective |
| ITC claimed beyond GSTR-2B amount | Rule 36(4) | Reverse excess in the same or subsequent period |
Rule 42 — Proportionate Reversal
ITC Reversal Under Rule 42 — Inputs Used for Exempt Supplies
Rule 42 applies when a business makes both taxable and exempt supplies and uses common inputs or input services for both. In this case, ITC attributable to exempt supplies must be reversed — you cannot claim ITC on the portion of inputs that serves your exempt business activities.
Rule 42 — ITC Reversal Formula
ITC to Reverse = (Value of Exempt Supplies / Total Turnover) × Total Common ITC
This calculation is done monthly and finally reconciled at the end of the financial year. Any excess reversal is reclaimed; any shortfall is paid with interest.
Step-by-Step Rule 42 Calculation
- Step 1: Identify Total ITC claimed during the period (T).
- Step 2: Separate ITC exclusively used for taxable supplies (T1) and exclusively for exempt supplies (T2).
- Step 3: Identify ITC on blocked items under Section 17(5) (T3).
- Step 4: Calculate Common Credit = T − T1 − T2 − T3 (this is called C1).
- Step 5: Apply the exempt ratio: Reversal = (Exempt Turnover / Total Turnover) × C1. This gives the amount to reverse in Table 4(B)(1) of GSTR-3B.
- Step 6: Reconcile annually in GSTR-9. Adjust any difference.
Who Needs Rule 42? Businesses supplying both taxable and GST-exempt goods or services simultaneously — for example, a company that sells taxable goods and also provides exempt educational services, or an exporter supplying both domestic taxable goods and zero-rated exports with common overhead expenses.
Rule 43 — Capital Goods
ITC Reversal Under Rule 43 — Capital Goods Used for Exempt Supplies
Rule 43 applies the same proportionate reversal principle as Rule 42 but specifically for capital goods (machinery, equipment, computers, vehicles used for business) that are used for both taxable and exempt supplies.
Rule 43 — Monthly Reversal Formula
Monthly ITC Reversal = (ITC on Capital Goods / 60 months) × (Exempt Turnover / Total Turnover)
The 60-month figure represents the assumed useful life of capital goods under GST. The ratio is applied monthly and reconciled annually.
Unlike Rule 42 (which is calculated each month on the basis of that month's ITC), Rule 43 operates over the entire assumed 60-month life of the capital good. The ITC is spread equally across 60 months and the exempt-proportion of each month's allocation is reversed in Table 4(B)(2) of GSTR-3B.
Important: If a capital good is used exclusively for taxable supplies — no reversal under Rule 43 is needed. If used exclusively for exempt supplies — full ITC must be reversed immediately. Rule 43 applies only to capital goods used for both.
180-Day Payment Rule
The 180-Day Payment Rule — ITC Reversal on Unpaid Invoices
Under the proviso to Section 16(2) of the CGST Act, if you claim ITC on an invoice but do not pay the supplier within 180 days of the invoice date, you must reverse the ITC in the GSTR-3B for the month in which the 180-day period expires.
Invoice date
Day 0
ITC claimed in GSTR-3B
Month of receipt
Payment deadline to supplier
Day 180
If unpaid on Day 180 — reverse ITC in
That month's GSTR-3B
Interest on reversed ITC
18% per annum from claim date
ITC re-claimable when
On actual payment to supplier
Partial Payments: If you make a partial payment within 180 days, you can retain ITC proportionate to the amount paid. Only the ITC on the unpaid portion needs to be reversed.
Watch Out:
This rule often catches businesses by surprise when dealing with disputed invoices or long credit periods. Maintain a payment tracker against every ITC-claimed invoice and set reminders before the 180-day mark to avoid unexpected reversals and interest liability.
GSTR-2B Reconciliation
GSTR-2B and ITC — Why Reconciliation Is Non-Negotiable
From January 2022, Rule 36(4) was amended to make GSTR-2B the definitive basis for ITC claims. ITC can only be claimed to the extent it appears in GSTR-2B for that period. This rule has zero tolerance — even a rupee of excess ITC claim attracts interest at 18%.
| Scenario | Action Required |
|---|---|
| Invoice in GSTR-2B and in your purchase register | Claim ITC — eligible and confirmed |
| Invoice in your records but NOT in GSTR-2B | Do NOT claim ITC. Follow up with supplier to file GSTR-1. Claim in the month it appears in GSTR-2B. |
| Invoice in GSTR-2B but NOT in your records | Verify receipt of goods/services. If received, claim after confirming. If not received, do not claim. |
| Invoice in GSTR-2B with wrong GSTIN or amount | Ask supplier to amend their GSTR-1. Do not claim until correct invoice appears. |
| Supplier has cancelled registration | ITC already reflected in GSTR-2B can be claimed. No new ITC from such supplier going forward. |
ITC Utilisation Order — IGST, CGST, SGST
The GST law prescribes a mandatory order for utilising ITC to offset output tax liability. This order cannot be changed:
| ITC Available | First Use Against | Then Against | Cannot Use Against |
|---|---|---|---|
| IGST ITC | IGST liability | CGST, then SGST (in any order) | — |
| CGST ITC | CGST liability | IGST liability | SGST / UTGST liability |
| SGST/UTGST ITC | SGST/UTGST liability | IGST liability | CGST liability |
Penalties & Interest
Interest and Penalties on Wrong ITC Claims
Incorrect ITC claims — whether through ineligible credits, excess claims, or failure to reverse — attract significant interest and penalty under the CGST Act.
Interest on wrongly availed ITC (Section 50)
18% per annum
Interest on delayed reversal (Section 50)
18% per annum
Penalty for fraudulent ITC claim (Section 122)
100% of ITC or ₹10,000 — whichever is higher
Penalty for non-fraudulent excess claim (Section 125)
Up to ₹25,000
GST Audit trigger for large excess ITC
Departmental audit / scrutiny notice
Section 50 Amendment (2021):
Interest at 18% on wrongly availed ITC is now charged only when the ITC is actually utilised to pay output tax — not merely when it is credited to the electronic credit ledger. This was a welcome relief for businesses that had ITC in their ledger but had not used it.
Special Situations
ITC in Special Situations
ITC on New GST Registration
A newly registered business can claim ITC on stock held on the date of registration — under Section 18(1). The ITC is available on inputs held in stock, inputs contained in semi-finished goods, and inputs in finished goods. A declaration in Form GST ITC-01 must be filed within 30 days of registration.
If you have recently completed your GST Registration, ensure you file ITC-01 promptly to avoid losing this opening stock credit.
ITC When Switching to Composition Scheme
When a regular taxpayer opts into the GST Composition Scheme, all ITC on stock, capital goods, and work-in-progress must be reversed on the day before the switch becomes effective. The reversal is reported in Form GST ITC-03.
ITC on Cancellation of GST Registration
When GST registration is cancelled, ITC remaining in the electronic credit ledger on capital goods, inputs, and semi-finished goods must be reversed in the final return (GSTR-10). The reversal amount is the higher of: ITC on the fair market value of goods, or ITC calculated as per Rule 44.
ITC on Export Supplies (Zero-Rated)
Exports are zero-rated under GST. Exporters can claim full ITC on inputs used in exported goods or services and apply for a cash refund of the accumulated ITC. The refund can be claimed through the LUT Filing route (export without payment of IGST) or by paying IGST and claiming a refund.
Common Errors
7 Most Common ITC Mistakes — And How to Avoid Them
⚠️
Claiming ITC Not in GSTR-2B
Claiming ITC on invoices your supplier hasn't filed in their GSTR-1. Result: interest at 18%. Fix: always reconcile GSTR-2B before filing GSTR-3B.
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Claiming Blocked Credits
Entering ITC on food, personal vehicles, club memberships, or construction of immovable property. These are permanently blocked under Section 17(5).
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Missing 180-Day Reversal
Not tracking payment dates and missing the 180-day reversal deadline. Maintain a vendor payment tracker with invoice dates and ITC amounts.
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No Rule 42 Calculation
Businesses with exempt supplies claiming full ITC without applying the Rule 42 proportionate reversal. This is a very commonly missed compliance requirement.
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Wrong IGST/CGST/SGST Split
Entering total ITC without correctly splitting into IGST, CGST, and SGST heads. This causes mismatches and incorrect liability offset calculations.
⚠️
Missing ITC-01 on New Registration
Newly registered businesses failing to claim ITC on opening stock by not filing Form ITC-01 within 30 days. This credit is permanently lost after the 30-day window.
⚠️
Claiming ITC After Time Limit
Attempting to claim ITC after the due date of the November GSTR-3B or the annual return filing date. Time-barred ITC cannot be claimed under any circumstances.
FAQ
Frequently Asked Questions — Input Tax Credit
- What is Input Tax Credit (ITC) under GST?
ITC under GST is the mechanism that allows GST-registered businesses to deduct the tax paid on purchases from the tax collected on sales. Only the net difference — output tax minus ITC — is payable to the government, eliminating cascading tax.
- Who is eligible to claim ITC?
Any GST-registered taxpayer who is not under the Composition Scheme is eligible to claim ITC, provided they hold a valid tax invoice, the supplier has filed GSTR-1, the goods or services have been received, and the tax has been paid by the supplier.
- What is the time limit to claim ITC?
ITC must be claimed by the earlier of: (a) the due date of GSTR-3B for November of the following financial year, or (b) the date of filing the annual return (GSTR-9). After this, ITC is permanently time-barred.
- What are blocked credits under Section 17(5)?
Section 17(5) permanently blocks ITC on motor vehicles for passenger transport, food and beverages, beauty and health services, club memberships, works contract for buildings, and goods or services for personal consumption — with specific exceptions.
- What is ITC reversal and when is it mandatory?
ITC reversal is the process of paying back ITC already claimed. It is mandatory when payment to supplier is not made within 180 days, goods are destroyed or written off, goods are used for exempt supplies (Rule 42), capital goods are used for exempt supplies (Rule 43), or GST Registration is cancelled.
- What is Rule 42 ITC reversal?
Rule 42 requires proportionate reversal of ITC when inputs or input services are used for both taxable and exempt supplies. The reversal formula is: ITC to Reverse = (Exempt Turnover / Total Turnover) × Total Common ITC. This is calculated monthly and reconciled annually.
- What is GSTR-2B and how does it affect ITC claims?
GSTR-2B is an auto-generated, static monthly ITC statement on the GST portal showing ITC available based on suppliers' GSTR-1 filings. From January 2022, ITC can only be claimed to the extent reflected in GSTR-2B — excess claims attract 18% interest.
- Can ITC be claimed on capital goods?
Yes, ITC on capital goods is available fully in the period of receipt for taxable business use. If used partly for exempt supplies, proportionate reversal under Rule 43 applies across the 60-month assumed life of the asset.
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