⚖️ Rule 42 — ITC Reversal Calculator

Compute ITC reversal for mixed taxable & exempt supplies under CGST Rules, 2017. All fields are live — edit any value and results update instantly.

GSTR-3B: Table 4(B) Provisional Monthly Rule 42(2) Annual True-up

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Tax Period: Tax Head: FY:

Step 1 Total ITC availed this period (₹)

T Total ITC on inputs / input services (GSTR-3B Table 4A)

T3 Blocked credit — Sec 17(5) (Motor vehicles, food, gifts etc.)

Step 2 ITC exclusively attributable (₹)

T1 Exclusively for non-business / personal use (Director car, club, personal expenses)

T2 Exclusively for exempt supplies (Interest income, dividend, agri inputs)

C1 = T − T1 − T2 − T3 → —

Step 3 Common credit pool (₹)

Reversal — exempt exclusive (= T2)

—

Reversal — non-business use (= T1)

—

Common credit (C1 − D1 − D2)

—

Step 4 Turnover ratio for proportionate reversal

E Exempt turnover (Interest, rent from residential, agri — per GSTR-3B Table 3.1(c))

N Non-taxable (non-GST) turnover (Petroleum, alcohol, stamp duty)

F Total turnover (all supplies) (As per books / GSTR-3B Table 3.1 total)

C3 = C2 × (E + N) / F → —

⚠ Provisional monthly ratio — True-up mandatory at year-end using actual annual figures per Rule 42(2). Adjusted via GSTR-3B of April or annual return.

Step 5 Calculation pipeline

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Total ITC

− T1+T2+T3

—

Exclusive deduct

—

Common pool

C3 reversal

—

Proportionate

—

Eligible common

Summary — GSTR-3B Filing Reference

D1 — Reversal (exempt exclusive) 4(B)(1) —

D2 — Reversal (non-business use) 4(B)(2) —

C3 — Reversal (proportionate exempt) 4(B)(2) —

⚠️ Total ITC reversal for the period —

✅ Net eligible ITC —

Exempt ratio applied —

History Monthly Computations ▼

Annual Rule 42(2) Annual True-Up ▼