Input Tax Credit (ITC) is often the largest tax asset sitting on a company’s balance sheet. Yet every year, businesses lose eligible GST credits not because they are ineligible, but because they fail to identify and claim them within the prescribed timelines. While the law currently allows ITC claims up to 30 November of the following financial year or the date of filing the annual return, whichever is earlier, September remains the most critical month for businesses to conduct an ITC health check and clean up outstanding issues.

The Costliest Oversight in GST Compliance

Imagine discovering that your company missed Rs 25 lakh of eligible ITC from professional fees, freight expenses, software subscriptions, and asset purchases.

The invoices are genuine. The expenses are business-related. The GST has been paid.

Yet the credit is unavailable because the claim was never made within the statutory timeline.

Unlike many tax disputes that can be litigated or rectified later, a missed ITC deadline often results in a permanent financial loss. What could have reduced your GST liability becomes a direct hit to profits and cash flows.

For CFOs and finance teams, this is not merely a compliance issue. It is a working capital issue.

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Understanding the Law

Section 16 of the CGST Act governs the availment of Input Tax Credit.

A taxpayer can claim ITC only if certain conditions are satisfied, including:

• Possession of a valid tax invoice or debit note
• Receipt of goods or services
• Tax payment by the supplier
• Compliance with prescribed return filing requirements

In addition to these eligibility conditions, Section 16(4) prescribes a time limit beyond which the credit cannot be availed. Currently, ITC relating to a financial year can be claimed up to:

Earlier of:

• 30 November following the relevant financial year; or
• Date of filing the annual return (GSTR-9).

For example, ITC pertaining to FY 2025-26 generally needs to be claimed by 30 November 2026 unless the annual return is filed earlier.

While the statutory deadline extends to November, businesses should ideally complete their review exercise by September to allow sufficient time for rectifications.

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Why September Matters More Than November

Most ITC issues cannot be resolved overnight.

A finance team may identify a missing invoice today, but obtaining the document from the vendor, correcting GSTIN errors, ensuring the supplier reports it correctly, and validating the credit can take several weeks.

Businesses that begin their review in October or November often find themselves racing against time.

By contrast, organizations that perform a comprehensive September review have enough runway to identify gaps and close them before the legal deadline.

Think of September as the last practical opportunity rather than the last legal opportunity.

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Five Areas Where ITC Is Commonly Missed

1. GSTR-2B Mismatches

This remains the single biggest reason for ITC leakage.

Common causes include:

• Suppliers failing to file GSTR-1
• Wrong GSTIN reported
• Incorrect invoice details
• Omitted invoices

Many businesses assume that all invoices appearing in their books are reflected in GSTR-2B. Unfortunately, this assumption often proves expensive.

A detailed reconciliation between purchase records and GSTR-2B should be the starting point of every ITC review.

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2. Unaccounted Vendor Invoices

Invoices frequently remain stuck with operational teams rather than reaching the finance department.

Typical examples include:

• Marketing agency bills
• Legal expenses
• Software subscriptions
• Travel-related invoices
• Consulting fees

When such invoices get recorded months later, the associated ITC may be overlooked altogether.

A department-wise confirmation exercise can help uncover these hidden credits.

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3. Debit Notes

Many companies focus exclusively on invoices and ignore debit notes.

However, debit notes can carry significant GST implications, particularly where there are price revisions, contractual settlements, or quantity adjustments.

A separate review of debit notes should form part of every September ITC exercise.

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4. Capital Expenditure

Fixed asset additions often contain substantial GST credits.

Examples include:

• Plant and machinery
• Laptops and servers
• Office equipment
• Furniture
• Electrical installations

A review of the fixed asset register frequently uncovers credits that were never availed despite being eligible.

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5. Reverse Charge Transactions

RCM transactions deserve special attention because the compliance process differs from regular vendor transactions.

Businesses should verify:

• Whether GST under reverse charge was discharged
• Whether self-invoicing requirements were complied with
• Whether corresponding ITC was claimed

Errors in RCM compliance often remain unnoticed until annual reviews.

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A Practical September ITC Health Check

Finance teams should consider the following checklist:

Step 1: Reconcile Purchase Register with GSTR-2B

Identify:

• Claimed credits
• Unclaimed credits
• Invoices present in books but absent in GSTR-2B
• Invoices present in GSTR-2B but absent in books

Step 2: Create a Vendor Action Tracker

Track:

• Vendor name
• Invoice details
• GST amount involved
• Nature of discrepancy
• Expected resolution date

Step 3: Scrutinize Expense Ledgers

Focus on:

• Professional fees
• Marketing expenses
• Rent
• Freight and logistics
• Repairs and maintenance
• Technology and software costs

Step 4: Review Capital Additions

Cross-check all fixed asset purchases against ITC claimed.

Step 5: Review RCM Transactions

Ensure no eligible ITC remains unclaimed due to documentation or process gaps.

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The Financial Impact

Consider a business that identifies the following unclaimed credits during its September review:

Particulars	ITC (Rs lakh)
Professional Fees	8
Marketing Expenses	5
Freight Charges	4
Capital Assets	10
Miscellaneous Expenses	3
Total	30

A lost credit of Rs 30 lakh means Rs 30 lakh of additional cost.

For a business operating at a 10% profit margin, generating an additional Rs 3 crore of revenue may be required just to offset that loss.

That is the true cost of poor ITC management.

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Questions Every CFO Should Ask Today

Before the September close, management should have clear answers to the following:

Have all purchase invoices been accounted for?

Has a GSTR-2B reconciliation been completed?

Are vendor mismatches being actively followed up?

Have all debit notes been reviewed?

Has the fixed asset register been examined for missed credits?

Have RCM transactions been validated?

Is there a tracker for unresolved ITC items?

Has ownership been assigned for closure before the deadline?

If the answer to any of these questions is “No”, there may still be money left on the table.

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Final Thoughts

The extension of the ITC deadline from the earlier September-linked timeline to 30 November has provided taxpayers with additional breathing room. However, the extension should be viewed as a safeguard, not a strategy.

The businesses that maximize GST efficiency are not necessarily the ones that file returns fastest. They are the ones that systematically review their ITC position, reconcile differences, engage with vendors early, and ensure every eligible credit is captured before the window closes.

A September ITC review may not seem exciting, but it is one of the few compliance exercises that can directly add lakhs to the bottom line. Before focusing on new tax savings, make sure you have claimed the credits you already earned.