If the tax amount is not matching between your invoice printout and online filing,
You need to reconcile GSTR data to match the BUSY reports and portal reports for GST, you need to follow the below steps:
Step 1: Click on transactions.
Step 2: GST misc utilities
Step 3: Download GSTR JSON data.
Step 4: Then Reconcile GSTR data for GSTR-1, GSTR-2A (Party wise) and (Vch. wise), GSTR-2B (Party wise) and (Vch. wise), GSTR-3B,
Step 5: Then select the relevant information and set Yes to mismatch report only to view the mismatch details.