New Delhi, Feb. 7 -- An optional, online system to reconcile transaction details for availing GST credit may soon be made mandatory, according to two persons aware of the development.

The invoice management system or IMS was introduced last October by the Goods and Services Tax Network (GSTN), the company that processes tax returns. It seeks to resolve the issue of businesses not getting tax credits because of either the seller not uploading the invoice in the GST portal or entering wrong details.

"IMS will be made compulsory at some point in future, starting with large business transactions above a monetary threshold to be specified," one of the persons cited above said on condition of anonymity. "Eventually, depending on the outcome a...