Rule 42 of the CGST Rules governs the reversal of Input Tax Credit (ITC) on inputs and input services when they are used partly for taxable supplies and partly for exempt supplies. Understanding this rule is essential for businesses that make both taxable and exempt supplies.
This comprehensive guide explains Rule 42, the calculation methodology, and practical compliance requirements.
What Is Rule 42?
Rule 42 applies to inputs and input services. It governs the reversal of ITC on inputs and input services when:
- They are used partly for taxable supplies (including zero-rated)
- And partly for exempt supplies or non-business purposes
When Does Rule 42 Apply?
The Trigger
Rule 42 applies when a registered person uses inputs or input services for both taxable and exempt supplies.
The Requirement
The portion attributable to taxable supplies is eligible, while the portion attributable to exempt supplies or non-business use is required to be reversed.
What Are Inputs and Input Services?
Inputs
Inputs are goods used in the course of business.
Input Services
Input services are services used in the course of business.
Common Examples
- Raw materials
- Office supplies
- Consulting services
- IT services
- Marketing services
Rule 42: Calculation Methodology
Step 1: Identify Common Credit
Identify the total ITC on inputs and input services that are used for both taxable and exempt supplies.
Step 2: Calculate Exempt Turnover Proportion
Calculate the proportion of exempt turnover to total turnover.
Step 3: Apply the Formula
ITC to be reversed = Total common ITC × (Exempt turnover / Total turnover)
Step 4: Report the Reversal
Report the ITC reversal in GSTR-3B.
Rule 42: Practical Example
Scenario: ABC Traders has:
- Total turnover: ₹1,00,00,000
- Exempt turnover: ₹20,00,000
- Common ITC on inputs and input services: ₹10,00,000
Calculation:
- Exempt turnover proportion: ₹20,00,000 / ₹1,00,00,000 = 20%
- ITC to be reversed: ₹10,00,000 × 20% = ₹2,00,000
Result: ABC Traders must reverse ₹2,00,000 of ITC in GSTR-3B.
Rule 42: Complete Reversal vs Proportionate Reversal
Complete Reversal
Inputs exclusively used for exempt supplies retain no ITC—full reversal required.
Proportionate Reversal
Inputs used for both taxable and exempt supplies require proportionate reversal.
No Reversal
Inputs exclusively used for taxable supplies retain full ITC.
Rule 42: What Is Included in Exempt Turnover?
Exempt supply under GST includes:
- Nil-rated supplies which attract nil rate of tax
- Non-taxable supplies
- Supplies on which the recipient is liable to pay tax on reverse charge basis
- Transactions in securities
- Sale of building when entire consideration is received after completion
Rule 42: Compliance Checklist
Pre-Filing
- Identify all common inputs and input services
- Calculate total turnover for the period
- Calculate exempt turnover for the period
- Calculate ITC to be reversed
Filing
- Report ITC reversal in GSTR-3B
- Ensure accurate calculation
Post-Filing
- Maintain documentation for audit purposes
- Keep records of turnover and ITC calculations
Rule 42: Common Mistakes to Avoid
1. Not Applying Rule 42
Where inputs or input services are used for both taxable and exempt supplies, full ITC cannot be retained.
2. Incorrect Exempt Turnover Calculation
Exempt turnover includes RCM supplies and transactions in securities.
3. Missing the Reversal in GSTR-3B
ITC reversal must be reported in GSTR-3B.
4. Not Maintaining Documentation
Proper documentation is essential for audit purposes.
Rule 42: When Reversal Is Not Required
Exclusively Taxable Supplies
If inputs and input services are used exclusively for taxable supplies, no reversal is required.
Zero-Rated Supplies
Zero-rated supplies (exports) are treated as taxable supplies for ITC purposes. No reversal is required for exports.
Need help with Rule 42 ITC reversal calculations? Our expert team provides comprehensive advisory to ensure accurate compliance.
Contact Anuj Desai & Associates: 📧 Email: office@anujdesaiassociates.com 📞 Phone: 9619456656 🌐 Website: https://anujdesaiassociates.com 🔗 LinkedIn: linkedin.com/in/ca-anuj-desai-122547230