Rule 42 and Rule 43 ITC Reversal: Calculation Method with Examples
- sai krishna
- Jun 7
- 2 min read
Rule 42 and Rule 43 of the CGST Rules require proportionate reversal of ITC when a taxpayer makes both taxable and exempt supplies, or uses inputs for both business and personal purposes.
When Does Rule 42 Apply?
Rule 42 applies to ITC on inputs and input services. It applies when: - You make both taxable and exempt supplies - You use inputs partly for business and partly for non-business purposes - You supply goods/services covered under Section 17(5) (blocked ITC)
Rule 42 Calculation (Step by Step)
Step 1: Identify total ITC claimed during the month (T) Step 2: Identify ITC directly attributable to taxable supplies (T1) Step 3: Identify ITC directly attributable to exempt supplies (T2) Step 4: Identify blocked ITC under Section 17(5) (T3) Step 5: Calculate common ITC: C1 = T - T1 - T2 - T3 Step 6: Calculate reversal: D1 = C1 × (Exempt turnover / Total turnover) Step 7: Net ITC = C1 - D1
Practical Example
Total ITC for April: ₹10,00,000 ITC for taxable supplies: ₹6,00,000 ITC for exempt supplies: ₹1,00,000 Blocked ITC (17(5)): ₹50,000 Common ITC (C1): ₹2,50,000 Exempt turnover: ₹20 lakhs | Total turnover: ₹1 crore Reversal (D1): ₹2,50,000 × (20/100) = ₹50,000 Net eligible ITC from common pool: ₹2,00,000
When Does Rule 43 Apply?
Rule 43 applies to ITC on capital goods. The reversal is calculated over 60 months (the useful life of capital goods as per GST rules). The formula is similar but spread across the life of the asset.
Annual Reconciliation (September Return / GSTR-9)
Rule 42 reversal must be reconciled annually. If the provisional reversal during the year was higher than actual, you can reclaim the excess in the September return of the following year. If it was lower, you must reverse the additional amount with interest.
Common Mistakes to Avoid
- Forgetting to include exempt supply turnover correctly (nil-rated + exempt + non-GST) - Not tracking Rule 42 reversal month-by-month - Ignoring capital goods reversal under Rule 43 - Missing annual reconciliation deadline
Disclaimer: Consult your CA for case-specific advice.
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