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Blocked credit is ITC the law makes unavailable for a specified category of supply, most notably under section 17(5) of the CGST Act. Reversal is the accounting and return treatment of reducing or giving up ITC; depending on why it is reversed, it may be permanent or reclaimable later. The legal reason for the amount—not the label used in a ledger—determines its treatment.
What is the difference between ITC reversal and blocked credit?
Section 17 of the CGST Act draws a distinction between apportionment and blocked credits. Subsections 17(1) and 17(2) restrict credit attributable to non-business use and exempt supplies. Subsection 17(5) lists categories for which ITC is not available, subject to the subsection’s own wording and exceptions. See CBIC’s CGST Act, section 17.
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“Blocked credit” therefore describes a statutory ineligibility ground. “Reversal” describes reducing credit that has been taken or included in a credit computation. An amount may be reversed because it was never eligible, because it must be apportioned for its use, or because a condition temporarily prevents retention of the credit. Reversal does not, by itself, tell you whether the amount can ever be reclaimed.
How to classify a credit amount
Assess each invoice or credit pool by its legal basis and use, then determine whether the amount is permanently unavailable or may become available again. The relevant procedures for apportionment include rule 42 for inputs and input services and rule 43 for capital goods used partly for non-business purposes or exempt supplies. The CBIC Rules compilation linked here is amended up to 1 January 2022, so confirm the rule text applicable to the tax period: CGST Rules, Part A.
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| Situation | What it means | Potential reclaim | GSTR-3B treatment described by CBIC |
|---|---|---|---|
| ITC ineligible under section 17(5) | Statutorily blocked, subject to the provision’s exceptions. | Not reclaimable while the statutory bar applies. | Table 4(B)(1), as an absolute/ineligible reversal. |
| Apportionment under section 17(1) or 17(2), with rules 42 or 43 | Credit is restricted to the eligible business/taxable-use share; the attributable ineligible portion is reversed. | The reversed portion is not treated as a temporary amount to reclaim merely because it is called a reversal. | Table 4(B)(1) for the absolute reversals described in the circular. |
| Rule 37 or section 16(2)(b) and (c) condition not yet satisfied | Credit is reversed pending satisfaction of the relevant condition. | Potentially reclaimable when the specified condition is met. | Table 4(B)(2); qualifying reclaimed ITC may be reported in Table 4(A)(5) and also shown in Table 4(D)(1). |
The reporting distinctions in the table follow CBIC Circular No. 170/02/2022-GST, dated 6 July 2022. It gives examples of absolute reversals under rules 38, 42 and 43 and section 17(5), and potentially reclaimable reversals under rule 37 and section 16(2)(b) and (c). The applicable legal provision and facts control classification; the examples are not a substitute for checking the conditions in the relevant rule or section.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Where should ITC reversal be reported in GSTR-3B?
Under the circular’s guidance, use Table 4(B)(1) for reversals that are absolute and cannot be reclaimed, including ineligible ITC under section 17(5). Use Table 4(B)(2) for reversals that are temporary and can be reclaimed after the specified condition is met. When eligible to reclaim, report the amount in Table 4(A)(5) and show the reclaim in Table 4(D)(1), as the circular directs.
Table 4(C) is the net ITC credited to the electronic credit ledger. CBIC says reversals and ITC that is ineligible under the Act should not be included in that net amount. The circular explains that GSTR-2B information flows into Table 4 but is editable; the registered person must identify ineligible credit and reversals before arriving at net ITC.
Quick Recap
What to check before filing
- Identify the provision that affects the credit: section 17(5), a use-based restriction or apportionment rule, or a condition affecting eligibility.
- For partial business or taxable use, determine the attributable eligible and ineligible portions under the applicable rules rather than treating the entire invoice as blocked by default.
- Decide whether the cause is permanent or whether a specified condition can later permit reclaim. Do not assume every reversal is permanent—or that every reversal is reclaimable.
- Apply the GSTR-3B instructions and law effective for the tax period being filed. The CBIC Rules compilation linked above runs only through 1 January 2022, and the cited circular is dated 6 July 2022; later changes were not independently confirmed here.
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