GST calculator · Section 17(1) to (3) and Rule 42(1)
Rule 42 Common ITC Reversal Calculator
Estimate monthly common input tax credit reversal using the Rule 42 inputs. The year-end recalculation under Rule 42(2) is outside this calculator and must be considered separately.
Working estimate, not a determination. Check the facts, applicable notification and current legal position before relying on a calculated date or amount.
Rule 42: common credit to reverse for a month
Legal basis: Section 17(1) to (3); Rule 42(1), CGST Rules, 2017; the year-end recalculation under Rule 42(2) is not included. See the Rules 42 and 43 article. Review date: 19 October 2026.
D1, D2 and the credit kept
Work each tax head (IGST, CGST, SGST/UTGST) separately, as Rule 42(1)(l) requires. Exempt supply excludes interest on deposits and loans (except for banks and NBFCs) and most Schedule III items.
C2, common credit
Reverse (D1 + D2)
C3, common credit kept
Rule 42 working paper
Inputs will appear here after the calculation runs.