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Published on: Sep 9, 2026

Rules 42 and 43 of CGST Rules - Input Tax Credit Reversal

Rule 42 and 43 of the CGST rules are crucial for managing the input tax credit (ITC) for supplies used both for business purposes and other purposes. To appropriately claim the input tax credit in such cases, taxpayers must reverse the input tax credit claim if claiming the credit becomes nil. This article dives deep into the details of Rules 42 and 43 of the CGST rules, along with the procedures for reversing the input tax credit claim.

Understanding Rule 42 of CGST Rules

Manner of Determination of Input Tax Credit: Rule 42 addresses the method for determining ITC concerning inputs or input services used both for business and non-business purposes, or for taxable supplies, including zero-rated supplies and exempt supplies.

  • Total Input Tax - 'T': Represents the total input tax on inputs and services during a tax period.
  • Non-Business Tax - 'T1': Part of 'T' attributable to non-business purposes.
  • Exempt Supplies Tax - 'T2': Part of 'T' used for exempt supplies.
  • Unavailable Tax Credit - 'T3': Represents credit not available under Section 17(5).
  • Eligible Credit - 'C1': Calculated as C1 = T - (T1 + T2 + T3);

For a detailed explanation, visit our Input Tax Credit Overview.

Further down the line, input tax credits intended for supplies that aren't exempt, including zero-rated ones, are denoted as 'T4'. After attribution, the remaining credit, called common credit 'C2', can be calculated by:

C2 = C1 - T4;

This distinction is crucial for understanding the benefits of the CGST regime.

The allocation of credits for exempt supplies, denoted as 'D1', and non-business purposes, denoted as 'D2', involves the following calculations:

  • Exempt Supply Credit - 'D1': Calculated using D1 = (E ÷ F) × C2, where 'E' stands for the exempt supplies value, and 'F' denotes the total turnover.
  • Non-Business Credit - 'D2': Equal to 5% of C2.
  • Business-Purpose Credit - 'C3': Determined using C3 = C2 - (D1 + D2);

Diving into Rule 43 of CGST Rules

Manner of Determination of ITC for Capital Goods: Rule 43 outlines ITC management for capital goods used partly for business and partly for non-business purposes or exempt supplies. Here is how it operates:

  • Capital goods used exclusively for producing taxable supplies (including zero-rated) are credited directly to the ledger.
  • Common capital goods credit is denoted as 'Tc', representing the aggregate 'A' credited to the ledger.
  • Monthly credit on capital goods, 'Tm', is calculated as Tm = Tc ÷ 60;

The allocation of common credit for exempt supplies, 'Te', is also significant:

Te = (E ÷ F) x Tr

For comprehensive guidelines and assistance on ITC, check our complete Input Tax Credit Guide.

Understanding these rules can significantly enhance strategic tax planning and compliance under the GST framework.

By comprehending the nuances of ITC under CGST Rules 42 and 43, businesses and tax professionals can ensure more accurate and advantageous tax calculations.

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Frequently Asked Questions

Common questions about CGST Rules 42 & 43.

Rules 42 and 43 of the CGST Rules provide the manner of determining and reversing input tax credit in cases where inputs or input services are used partly for business purposes and partly for other purposes, or partly for making taxable supplies (including zero-rated supplies) and partly for making exempt supplies. These rules help taxpayers correctly calculate and claim the eligible input tax credit.
Under Rule 42, the input tax credit attributable to exempt supplies, denoted as 'D1', is calculated as: D1 = (E/F) x C2, where 'E' is the aggregate value of exempt supplies during the tax period, 'F' is the total turnover in the state of the registered person during the tax period, and 'C2' is the common credit left after attributing input tax credit to taxable supplies.
Rule 43 deals with the determination and reversal of input tax credit on capital goods used partly for business and partly for other purposes, or partly for making taxable supplies and partly for making exempt supplies. It provides a mechanism to calculate the common credit on capital goods and the portion attributable to exempt supplies, which needs to be reversed.
Under Rule 43, the common credit on capital goods for a tax period, denoted as 'Tc', is the aggregate of the amounts of input tax credit on capital goods not exclusively used for exempt supplies or non-business purposes. This common credit is then spread over the useful life of the capital goods to calculate the input tax credit attributable to each tax period.
'Tm' denotes the amount of input tax credit attributable to a tax period on common capital goods during their useful life. It is calculated as Tm = Tc/60, where 'Tc' is the common credit on capital goods for the tax period.
Under Rule 43, the input tax credit attributable to exempt supplies for capital goods, denoted as 'Te', is calculated as: Te = (E/F) x Tr, where 'E' is the aggregate value of exempt supplies during the tax period, 'F' is the total turnover of the registered person during the tax period, and 'Tr' is the aggregate of 'Tm' for all common capital goods whose useful life remains during the tax period.
The amount 'Te', representing the input tax credit attributable to exempt supplies for capital goods, along with the applicable interest, is required to be added to the output tax liability of the registered person during every tax period of the useful life of the concerned capital goods.
Yes, under Rule 42(2), the input tax credit determined as per sub-rule (1) must be calculated finally for the financial year before the due date for furnishing the return for the month of September following the end of the financial year to which such credit relates.
If the aggregate of the amounts calculated finally in respect of 'D1' and 'D2' under Rule 42(2) exceeds the aggregate of the amounts determined under sub-rule (1), the excess amount must be added to the output tax liability of the registered person, along with interest. Conversely, if the aggregate of the amounts determined under sub-rule (1) exceeds the final calculation, the excess amount can be claimed as credit.
Under Rule 42(1)(j), the amount of credit attributable to non-business purposes if common inputs and input services are used partly for business and partly for non-business purposes, denoted as 'D2', is calculated as 5% of the common credit 'C2'.