A low IGST balance alone does not establish utilisation
For wrongly availed IGST credit, test the combined IGST, CGST and SGST balances in the electronic credit ledger. If that combined balance never falls below the wrong IGST amount before reversal, interest under section 50(3) does not arise on that credit merely because the IGST head alone is lower. Compensation cess credit cannot be added to this combined balance. Wrong credit still needs correction even where interest is nil.
The rule, clarification and rate are separate authorities
Checked on 24 October 2026. CBIC Circular 192/04/2023-GST dated 17 July 2023 addresses this wrong-IGST-credit issue. Rule 88B(3), in ICAI’s April 2026 compilation of GST bare law supplies the utilisation and time-period mechanics. The clarification should not automatically be extended to every wrong CGST or SGST credit case.
The interest rate for the stated section 50(3) computation is 18% annually. The statutory ceiling of 24% is not the notified working rate. Finance Act, 2022, section 116(1) and the Sixth Schedule amended the relevant entry in Notification 13/2017-Central Tax from 24 to 18 with effect from 1 July 2017. Maintain this rate authority separately from the rule determining utilisation.
Reconstruct movements, not only month-end balances
Download transaction-level ledger evidence from availment through reversal or payment. A month-end surplus can conceal an earlier depletion. Record each change in the combined relevant balance, the identified wrong credit and its reversal. Interest is measured on the wrong credit actually utilised, rather than automatically on the entire ineligible invoice or mismatch amount.
Under the explanation to rule 88B(3), utilisation is linked to the ledger falling below the wrong-credit amount, to the extent of that shortfall. Where depletion occurs through tax payment in a section 39 return, its prescribed utilisation date is the return due date or actual filing date, whichever is earlier. In other cases, use the relevant ledger-debit date. Do not reflexively start interest from the original credit-availment date.
Prepare amount-and-period segments where utilisation increases or identified wrong credit is partly reversed. Do not assume a later legitimate credit entry erases interest already incurred or necessarily constitutes reversal of the wrong credit. Trace actual corrective entries and their allocation. Where several disputed credits coexist, document the allocation rather than selecting whichever assumption produces the lowest result.
Interest working and correction controls
For each established segment, the illustrations use principal × 18% × elapsed days ÷ 365, with final display rounded to two decimals. Date illustrations expressly use elapsed days between the stated dates. Retain the actual dates and verify the applicable day-count and payment presentation in the return or proceedings; do not substitute a rounded month for calendar days.
Reversal, tax payment, interest payment and correction of the underlying eligibility error are separate controls. A nil-interest conclusion should be supported by the ledger trail, not a statement that credit was “not used” based on an annual closing balance. Keep compensation cess in a separate reconciliation even where it appears on the same electronic ledger extract.
Worked illustrations
These illustrations use fictional facts and expressly stated assumptions. Amounts are Indian rupees unless a different currency or unit is specified. They are independent examples, not findings about any actual client.
Illustrative example 1: IGST head falls but combined credit is sufficient
Wrong IGST credit is ₹100,000. The relevant balances are IGST ₹80,000, CGST ₹60,000 and SGST ₹40,000: combined ₹180,000. If the combined balance stays at least ₹100,000 throughout the interval until reversal, the wrong credit is not treated as utilised for this interest test. IGST alone being ₹20,000 below the wrong credit does not change that conclusion.
Illustrative example 2: Interest on the identified shortfall
Wrong IGST credit is ₹100,000 and the combined relevant balance falls to ₹60,000, establishing utilisation of ₹40,000. Assume that amount remains utilised for an established 45-day interval until reversal. Interest = 40,000 × 18% × 45 ÷ 365 = ₹887.67, rather than interest on the entire ₹100,000.
Illustrative example 3: Cess cannot cure the deficit
Wrong IGST is ₹100,000. IGST, CGST and SGST together total ₹80,000, while compensation cess credit is ₹50,000. The relevant deficit is ₹20,000, even though a misleading all-head total would be ₹130,000. For a stipulated 30-day utilisation period, interest is 20,000 × 18% × 30 ÷ 365 = ₹295.89.
Illustrative example 4: Late return: earlier date controls
Assume the section 39 return is due on 20 August 2026, filed on 25 August, and its tax-payment debit produces identified utilisation of ₹50,000. Rule 88B uses 20 August, the earlier date. If reversal is on 19 September 2026, the elapsed interval is 30 days; interest on the stated basis is ₹739.73. Using filing date alone would omit five elapsed days.
Illustrative example 5: A debit outside the return-payment case
Assume another ledger debit on 5 July 2026 establishes utilisation of ₹30,000, reversed on 4 August 2026. The elapsed interval is 30 days. Interest = 30,000 × 18% × 30 ÷ 365 = ₹443.84. Do not replace the actual debit date with an unrelated return due date.
Illustrative example 6: Long holding period without utilisation
Wrong IGST credit of ₹500,000 is reversed after an assumed 90-day interval. The combined relevant balance never goes below ₹600,000 in that period. Identified utilisation is zero and section 50(3) interest on this wrong credit is zero. The 90-day delay does not make the credit eligible or remove the reversal requirement.
Illustrative example 7: Partial reversal creates two amount-period segments
Identified utilisation is ₹60,000 for 10 days. A documented ₹20,000 reversal then leaves ₹40,000 utilised for another 20 days, when the remainder is reversed. With no other relevant movements, interest = [(60,000 × 10) + (40,000 × 20)] × 18% ÷ 365 = ₹690.41. Retain the reversal allocation supporting both segments.
Ten-step verification table
| Step | Verification | Evidence to retain |
|---|---|---|
| 1 | Identify the exact wrong IGST credit and availment event | Invoice-level eligibility note and ledger entry. |
| 2 | Determine the applicable interest provision | Section 50(3) and rule 88B(3) analysis. |
| 3 | Download the complete intervening ledger movements | Transaction-level extract, not only closing balances. |
| 4 | Aggregate IGST, CGST and SGST for this circular | Head-wise balance reconciliation. |
| 5 | Exclude compensation cess from that aggregate | Separate cess balance working. |
| 6 | Locate every relevant depletion | Chronological shortfall calculation. |
| 7 | Determine utilisation dates under the correct rule limb | Return due/filing dates or other debit evidence. |
| 8 | Allocate reversals and calculate amount-period segments | Documented correction entries and allocation method. |
| 9 | Apply the verified rate and recalculate days | Rate authority and independent interest worksheet. |
| 10 | Reconcile corrective and interest payments | Return, payment evidence and final ledger review. |
Sixteen practitioner FAQs
1. Can interest arise just because IGST alone falls below the wrong credit?
Not under the circular’s combined-balance test if the relevant aggregate remains sufficient throughout.
2. May compensation cess credit be included?
No. Keep it outside the aggregate used for this wrong-IGST test.
3. Does the circular validate an ineligible invoice?
No. Eligibility and correction remain separate from whether the wrong credit was utilised.
4. Is the interest rate automatically the statutory maximum?
No. Apply the effective notified rate; the stated computation uses 18%, not the 24% ceiling.
5. Does interest invariably start on availment?
No. Establish the utilisation date under rule 88B(3).
6. Which date applies when a return is filed late?
For the specified return-payment depletion, compare the return due date and actual filing date and use the earlier.
7. What if the return is filed before its due date?
The earlier-date rule points to actual filing for that return-payment case.
8. What date applies to another kind of debit?
Use the relevant debit date under the other limb of the explanation.
9. Is a sufficient year-end balance conclusive?
No. An earlier intervening shortfall may establish utilisation.
10. Does the combined test automatically apply to wrong CGST credit?
No. This circular addresses wrong IGST. Examine the distinct utilisation restrictions and authorities for another credit head.
11. Should the entire mismatch amount always bear interest?
No. Establish how much wrong credit was utilised and for how long.
12. How should partial reversal be handled?
Trace the identified reduction and split the principal into supported amount-period segments.
13. Does a later valid credit entry automatically reverse the wrong credit?
No. Reconcile the actual correction and do not assume that an unrelated credit entry extinguishes the earlier exposure.
14. Can monthly averages replace transaction balances?
They can hide shortfalls. Use a chronology adequate to establish the utilisation events.
15. Should all interest segments be rounded separately?
Retain precision in the working and reconcile the final payable amount to applicable payment presentation rules.
16. What supports a nil-interest conclusion?
The wrong-credit identification, complete combined-balance trail, exclusion of cess and actual reversal evidence.
Conclusion
A defensible interest working identifies the wrong credit, the relevant combined balance, the utilisation event and the correction date. Reconcile those facts before multiplying by an annual rate.