ITC Reversal Under Rule 42 and 43, Explained

Why ITC reversal exists

Input Tax Credit is meant to apply only to inputs used for taxable business purposes. When inputs, input services, or capital goods are used partly for exempt supplies or non-business purposes, the portion of credit attributable to that non-taxable use has to be reversed — Rules 42 and 43 set out how to calculate that reversal.

Rule 42: Inputs and input services

This rule applies where common inputs and input services are used for both taxable and exempt supplies, or partly for personal/non-business purposes. The reversal is calculated proportionately, based on the ratio of exempt turnover (or non-business use) to total turnover, and is generally computed and adjusted on a periodic basis with a final annual reconciliation.

Rule 43: Capital goods

Capital goods used for both taxable and exempt supplies follow a different mechanic — the credit is spread over a prescribed useful life, and reversal is calculated for the portion of that remaining life attributable to exempt use, rather than reversed all at once.

A simplified illustration

If a business has both taxable and GST-exempt revenue streams and uses shared inputs (like office rent, or a common software subscription) across both, the ITC on those shared inputs can't be claimed in full — only the portion reasonably attributable to the taxable business. The exact ratio and computation mechanics are detailed in the rules and are worth working through carefully rather than estimating.

Where this commonly goes wrong

• Businesses with a small exempt revenue stream forgetting that any exempt supply triggers a proportionate reversal obligation on common credits
• Not tracking capital goods separately for Rule 43 purposes, and instead lumping them in with regular input reversal
• Missing the annual reconciliation and true-up, which can itself become a source of interest liability if the earlier provisional reversal was understated

This is one of the more mechanically involved areas of GST compliance — worth having your reconciliation reviewed periodically rather than only at annual return time.

Related Reading