
CA

GST warriors!
Have you ever felt like you’re playing hide-and-seek with Input Tax Credit (ITC) reversals? You’re not alone.
Rule 42 of CGST/SGST Rules is the maze every CA, tax consultant, and business owner must navigate when dealing with mixed-use inputs.
But don’t worry; this guide is your map, compass, and a little bit of comic relief. Let’s crack Rule 42 together and make ITC reversal one less thing to lose sleep over!
Input Tax Credit (ITC) is the backbone of the GST regime, letting you claim credit for GST paid on business purchases.
But here’s the twist: if those purchases are used for both taxable and exempt supplies or business and personal reasons, Rule 42 of CGST/SGST Rules steps in.
It ensures you only claim what’s rightfully yours and reverse the rest. Mess this up, and you’re looking at penalties, interest, and a not-so-friendly GST officer knocking at your door.
Rule 42 of CGST/SGST Rules is not just for big corporates, it applies to everyone from boutique consultancies to manufacturing giants.
| Rule | Applies To | Frequency | What’s Reversed |
|---|---|---|---|
| Rule 42 | Inputs & input services | Monthly + Annual | ITC on mixed-use inputs |
| Rule 43 | Capital goods | Quarterly + Annual | ITC on capital goods |
Specific Credit
Common Credit
Why this matters: Under Rule 42 of the CGST/SGST Rules, only the common credit gets split up and reversed.
Let’s break down the math (don’t worry, we’ll keep it simple):
Variables:
Steps:
1. Common Credit (C1):
C1=T−(T1+T2+T3)
2. Credit for Taxable Use (T4):
Subtract T4 from C1 to get credit for mixed use.
3. Exempt Supplies Reversal (D1):
D1=Exempt Turnover/Total Turnover×C1
4. Non-Business Use Reversal (D2):
D2=5%×C1 (unless you have exact numbers)
5. Final Eligible ITC:
Eligible ITC=C1−(D1+D2)
Let’s say:
Step-by-step:
C1=1,00,000−(10,000+20,000+5,000)=₹65,000
D1=(2,00,000/10,00,000)×65,000=₹13,000
D2=5%×65,000=₹3,250
Total Reversal=₹13,000+₹3,250=₹16,250
Eligible ITC=₹65,000−₹16,250=₹48,750
Monthly Filing
Annual Adjustment
Pro tip: Keep your records tight; GST audits love to zoom in on ITC reversals.
A CA firm offers both taxable consulting and exempt educational workshops. Office rent and utilities are standard inputs. Rule 42 of CGST/SGST Rules ensures only the business/taxable portion of ITC is claimed, with the rest reversed.
A manufacturer produces both taxable goods and exempt items (like certain food products). Inputs like electricity and maintenance are shared. Rule 42 ensures the ITC is allocated appropriately.
A: Late reversal means 18% interest and possible penalties. Always reconcile monthly and annually.
A: Yes, make adjustments in subsequent GSTR-3B or your annual return (GSTR-9).
A: No, exports and SEZ supplies are zero-rated but still considered taxable.
A: Use the 5% default for non-business use unless you have precise figures.
A: Failing to segregate specific and common credits and missing annual adjustments.
Mastered Rule 42 of CGST/SGST Rules? Do you have a hack, horror story, or favorite tool? Drop it in the comments below; let’s help each other make GST compliance a breeze!


Chartered Accountant


Vyapar TaxOne


CA