Rule 42 and 43 ITC Reversal: Common Credit Control for Finance Teams

Common credit is not reversed by an arbitrary percentage. Rules 42 and 43 prescribe separate calculations for inputs/input services and capital goods.

What the business should understand

• Section 17 requires attribution where goods or services are used partly for business/non-business or taxable/exempt supplies.
• Rule 42 addresses inputs and input services; rule 43 addresses capital goods over the prescribed useful-life method.
• Exclusive taxable/zero-rated credit, exclusive exempt/non-business credit and common credit must be identified before the proportion is calculated.
• Exempt turnover has statutory inclusions and exclusions that can differ from accounting revenue.
• Rule 42 requires annual true-up under the applicable process; capital-goods common credit continues through the rule 43 life.

Use the GST Input Tax Credit Eligibility and Blocked-Credit Checker to work through the related inputs before acting.

The five-point review

For the connected rule, example or next step, see GST 180-Day ITC Reversal Calculator: Rule 37 Working.

Practical example

For the connected rule, example or next step, see GST Reconciliation Dashboard for Finance Teams.

How to apply the framework

Tag exclusive credit at invoice level so only genuine common credit enters the formula. This is usually more valuable than debating the final percentage.

For capital goods, maintain asset-level commencement, use changes and remaining useful life. When an asset changes from exclusive taxable to common use, rule 43 treatment must be documented.

Decision workflow

Define the legal question before changing the return

Identify the GSTIN, tax period, transaction, document and exact statutory question. Review credit pool, use and turnover together. Freeze the source data so that later ERP edits do not destroy the evidence used for the decision.

Reconcile from commercial reality to portal data

Start with the contract or commercial event. Move through the invoice, receipt or movement evidence, e-invoice or e-way bill, accounting entry, return and electronic ledger. Classify each difference as timing, error, ineligible amount, statutory exception, disputed position or completed correction. Avoid a plug entry whose only purpose is to make two reports equal.

Record the conclusion and future control

Prepare a concise position note with facts, authority, amount, alternative view and approval. Preserve the filing acknowledgement and update the responsible master data, vendor rule, invoice workflow or monthly checklist. The objective is not only to survive one review but to prevent the same issue in the next period.

Action checklist

• Classify invoice credit before claiming.
• Compute rule 42 monthly.
• Maintain rule 43 asset register.
• Use statutory exempt turnover.
• Perform annual true-up.
• Reconcile reversals to GSTR-3B.

Evidence to keep

• Invoice-level ITC register
• Taxable/exempt turnover working
• Rule 42 monthly and annual file
• Rule 43 capital-goods register
• GSTR-3B and ledger entries

Warning signs

Finin2min takeaway