Run 2B vs Purchase Register reconciliation

Reconciliation is the core daily workflow. ThynkTax does it in three phases.

Phase 1: Exact match

ThynkTax matches on (Supplier GSTIN + Invoice Number + Invoice Date + Total Value). This catches ~85% of invoices in a typical period.

Phase 2: Fuzzy match

For the residual ~15%, ThynkTax applies fuzzy rules:

• Amount within ±1 paisa - typically rounding differences
• Date within ±1 day - month-boundary cases (invoice dated 31st vs 1st)
• Invoice number normalisation - strips leading zeros, trims whitespace, ignores case

The fuzzy-matched pairs are surfaced for one-click confirmation.

Phase 3: Classify residuals

Unmatched invoices land in four buckets:

• Missing in books - supplier filed but you have no PR entry. Two reasons: (a) you missed it, (b) supplier filed against the wrong GSTIN. Action: chase the supplier; ITC can wait for next month.
• Missing in portal - you have a PR entry but supplier hasn't filed. Action: chase the supplier; ITC is not available until they file.
• Mismatched - both sides exist but disagree on value or tax. Action: the AI explanation panel suggests the likely cause (e.g. supplier filed with wrong place of supply). Resolve by amending one side or rejecting in IMS.
• 17(5) blocked - invoice matches but the input is on the blocked-credit list (motor vehicle, food, etc.). Action: Accept in IMS but don't claim ITC in GSTR-3B.

Output

The reconciliation produces:

• Matched count + ITC available (drives GSTR-3B Part 4(A))
• Pending follow-ups list (auto-email to suppliers if enabled)
• Section 17(5) blocked list (for Schedule 4(D) of GSTR-3B)
• ITC reversal under Rule 37 (>180-day unpaid invoices)

Audit trail

Every match decision (auto or manual) is logged with timestamp, user, and reason. The log is what you cite if CBIC asks how a specific ITC claim was supported.