Building an evidence-based Goods and Services Tax input tax credit working file for businesses

Tax professionals must maintain a rigorous working file to substantiate Input Tax Credit (ITC) claims under the Goods and Services Tax (GST) framework. This guidance focuses on establishing an evidence-backed trail for business use, clearly demarcating taxable supplies, exempt supplies, and blocked credits pursuant to Section 16 and Section 17 of the governing legislation. Proper documentation ensures that businesses accurately separate their eligible inputs from ineligible ones before filing statutory returns.

Under the statutory rules, businesses dealing in both taxable and exempt supplies face complex apportionment requirements. The framework mandates meticulous adherence to Rule 42 for general inputs and input services, alongside Rule 43 for capital goods. In practice, taxpayers often stumble when calculating the exact proportional reversals required for non-business or exempt usage, leading to potential audit disputes and interest liabilities. Tax practitioners and accountants should immediately review their clients' ITC computation sheets against the specific mandates of Rules 42 and 43.

Ensure that all working files contain clear audit trails linking every purchase invoice to its ultimate business application and proportional reversal calculation. Bottom line: maintaining these granular working files protects your clients from unexpected tax demands during departmental audits.