GST Input Tax Credit: The 5 Most Common Mistakes That Trigger Notices

The GST department's data-mining capabilities have improved dramatically. Mismatches between your GSTR-3B and GSTR-2B, supplier defaults, and ineligible credits are now flagged automatically — often resulting in notices within 60–90 days of filing.

Here are the five mistakes your accounting team must stop making.

Mistake 1: Claiming ITC Without GSTR-2B Reconciliation

The problem: Many businesses claim ITC based on purchase invoices and GSTR-2A without cross-checking GSTR-2B — the legally binding, auto-populated statement.

Since January 2022, the GST department restricts ITC to what appears in GSTR-2B. Claiming credits beyond GSTR-2B (even with valid invoices) results in automatic reversal plus interest at 18%.

The fix:

• Reconcile purchases with GSTR-2B every month before filing GSTR-3B
• Use accounting software that auto-imports GSTR-2B data
• Chase vendors who have not filed GSTR-1 (their delay directly blocks your credit)

Mistake 2: Claiming ITC on Blocked Credits (Section 17(5))

Section 17(5) of the CGST Act permanently blocks ITC on specific goods and services regardless of their business use.

Commonly missed blocked credits:

Exception for motor vehicles: ITC is allowed if the vehicle is used for transporting goods, or the business itself is transportation of passengers or teaching driving.

Mistake 3: Missing the Time Limit for ITC Claims

The rule: You can claim ITC on an invoice only until the earlier of:

1. 30th November of the next financial year (FY 2024-25 invoices → claim by 30 Nov 2025), or
2. Filing date of the annual return (GSTR-9) for that year

Many businesses accumulate old invoices and try to claim ITC in bulk — but if the time window has passed, the credit is permanently lost.

The fix: Set a calendar alert every September to review unclaimed ITC going back to April of the previous year.

Mistake 4: Not Reversing ITC When Payment Is Not Made in 180 Days

Section 16(2)(c): If you have taken ITC on a purchase invoice but have not paid the vendor within 180 days of the invoice date, you must reverse the ITC along with interest.

This is frequently overlooked in businesses with stretched payment cycles — especially in sectors like construction, manufacturing, and retail where payment delays are common.

What happens:

1. ITC claimed → Payment to vendor overdue beyond 180 days
2. You must reverse in GSTR-3B (Table 4B)
3. Interest at 18% from the date of original credit until reversal

Re-credit rule: Once you pay the vendor, you can re-claim the reversed ITC in the return for the month of payment.

Mistake 5: Claiming ITC on Non-business Expenditure

ITC is available only for goods and services used for business purposes. When the same purchase is used partly for business and partly for personal/exempt use, proportional reversal is required (Rule 42/43).

Common audit triggers:

• Company car used by director for personal travel — no ITC
• Mobile phone bills where personal calls exceed business calls
• Residential property renovation claimed as "business premises"
• Client entertainment claimed as "sales promotion"

Bonus: What Happens After a GST Department Notice?

1. DRC-01A (Intimation) — Informal pre-notice. Respond within 30 days or a formal notice follows.
2. DRC-01 (Notice) — Formal demand. Respond within the specified period (usually 30–60 days).
3. Personal Hearing — You can request and attend a hearing before the adjudicating officer.
4. Order (DRC-07) — Tax, interest, and penalty confirmed. Can be appealed to the Appellate Authority.

Most ITC disputes can be resolved at the DRC-01A stage with proper documentation and justified explanations.

ITC Health Check: Monthly Checklist

• ☐ Download GSTR-2B by 14th of the month
• ☐ Reconcile purchase register vs GSTR-2B line by line
• ☐ Identify vendors who have not filed — send reminders
• ☐ Verify no Section 17(5) blocked credits are claimed
• ☐ Check 180-day payment status for all ITC claimed
• ☐ Calculate proportional reversal for dual-use assets
• ☐ Review outstanding old invoices; claim before time limit