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Reconcile GST returns separately for every GSTIN, then consolidate the closed results for management reporting. A business may share a PAN across state registrations, but each registration is a distinct person under Section 25(4) of the Central Goods and Services Tax Act, 2017, as published by CBIC. That means sales, tax liabilities, input tax credit (ITC), and return differences must remain traceable to the GSTIN that reported them.
Why reconciliation must be GSTIN-wise
Use the GSTIN—not the company-wide PAN—as the working unit for return checks. Section 25(4) treats a person with more than one registration as distinct persons for purposes of the Act. CBIC’s reconciliation form instructions likewise describe separate reconciliation statements for each GSTIN and require multi-state entities to derive ITC separately for each GSTIN.
You can aggregate resolved figures for internal management reporting, but that summary should preserve state, GSTIN, and tax-head dimensions. A consolidated number must not conceal which registration owns a liability, credit, or unresolved difference.
Set up a GSTIN-level control file
Before comparing returns, establish a reliable master and keep underlying records tagged to the registration they belong to.
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- GSTIN master: Record each registration’s legal name, state, GSTIN, return frequency, accounting location, responsible preparer and reviewer, and any separate registration or Input Service Distributor (ISD) role. Verify registration details in the GST Portal.
- Registration-tagged source data: Extract sales invoices, credit and debit notes, purchase invoices, expenses, reverse-charge items, tax payments, and electronic ledger movements with the relevant GSTIN and tax period.
- Shared-cost support: Keep the original invoice, the registrations that use the service, the allocation calculation, and evidence for the allocation basis. Do not let a consolidated accounting entry erase the underlying registration detail.
- Return calendar: Record filing frequency per GSTIN. The GST Portal says a taxpayer can select QRMP for some GSTINs while other GSTINs under the same PAN remain outside QRMP; confirm each registration’s current frequency, period, and due dates on the portal. See the GST Portal QRMP FAQ.
Reconcile outward supplies and tax liability
Start with the registration’s sales records and compare them with that GSTIN’s GSTR-1, the statement of outward supplies. The GST Portal’s guide describes invoice-level and summary data, amendments, notes, exports, and HSN/SAC summaries in GSTR-1. Include the applicable exempt, nil-rated, and non-GST reporting as well as taxable supplies.
- Tie source records to GSTR-1. Compare invoice-level sales and adjustments for the GSTIN and period. Check amendments, credit and debit notes, exports, and the relevant HSN/SAC summaries.
- Review any GSTR-1A changes. The portal describes GSTR-1A as an optional facility to add or amend records for the same period before filing GSTR-3B. Check whether changes have been made and whether they affect the liability comparison.
- Compare liability with GSTR-3B. Reconcile the outward-supply liability reported in GSTR-1 to the relevant GSTR-3B amounts and identify classification, timing, or other differences for follow-up.
- Tie tax paid to records. Compare the return liability and payment with the GSTIN’s payment records and electronic ledger movements. Keep each tax head visible rather than netting across registrations.
Use the GST Portal GSTR-1 guide for its description of GSTR-1 and GSTR-1A. A difference is an item to investigate, not automatically an error: document its period, classification, cause, and resolution.
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Reconcile inward supplies and ITC
Review GSTR-2B against the books of the same GSTIN. GSTR-2B is an auto-drafted, static ITC statement generated for each registered person; it is not a return to file. It informs the review but does not determine every eligibility question. The portal’s GSTR-2B FAQ and GSTR-2B advisory explain its role and limitations.
- Match documents to the correct GSTIN. Compare purchase and expense records with the registration’s GSTR-2B using supplier, invoice, date, taxable value, and tax details.
- Classify each exception. Distinguish supplier filing or timing differences, data mismatches, possible duplicates, potential ineligibility, reverse-charge items, and other review questions.
- Assess credit rather than accepting the statement blindly. Check eligibility under the applicable rules, identify duplicate claims, apply required reversals, and review reverse-charge tax. The advisory notes that the system’s “ITC not available” categories are limited; the taxpayer must self-assess other restrictions.
- Follow up on supplier changes. Track missing or incorrect supplier reporting and amendments. Portal guidance says a GSTR-1A addition or amendment reaches the recipient’s next-period GSTR-2B, so record the expected period and verify the later statement.
- Tie eligible ITC to the return and ledger. After required reversals and checks, compare the eligible amount with GSTR-3B and the GSTIN’s electronic credit ledger. Do not count a credit twice or use one registration’s credit as though it belonged to another.
Keep credits and shared services in the right registration
Do not pool ITC across state registrations simply because they belong to the same business or PAN. CBIC FAQ guidance says separate state registrations are distinct registered persons and cross-utilization of credit between them is not allowed. Consult the CBIC FAQ.
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Common input services used by multiple registrations need an appropriate invoicing or distribution approach. CBIC’s Sectoral FAQs describe distributing credit through the ISD mechanism to the distinct persons that actually use the services. Identify centrally received services, the registrations that use them, and the supporting invoice and allocation records. The right treatment depends on current law and the facts; obtain professional review when the supply, valuation, place of supply, or ISD treatment is uncertain.
Log differences so another reviewer can close them
Maintain one exception log with a separate GSTIN and tax-period reference for every item. Include enough detail to trace the difference from source document to return and resolution.
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- GSTIN and tax period
- Source value and return or statement value, with the relevant tax head
- Amount and likely cause, such as timing, mismatch, duplicate, classification, or eligibility review
- Action required, owner, and target date
- Closure evidence, such as a corrected record, supplier follow-up, return adjustment, or documented review
A reviewer should be able to follow each open or closed item back to the relevant invoice, books, portal download, and return entry.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Close the financial year registration by registration
Prepare an annual turnover and ITC bridge for each GSTIN. Reconcile the underlying books or consolidated financial statements to that registration’s annual return, explain timing items and allocations from central accounts, and retain the supporting calculations. CBIC’s reconciliation form instructions describe GSTIN-wise reconciliation, but those are historical instructions; check the current form and requirements for the financial year being filed.
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Use a consolidated view only after GSTIN checks
Once registration-level reconciliation is complete, aggregate the results for management reporting if useful. Keep the underlying GSTIN, state, and tax-head breakdown, and show unresolved exceptions separately so a corporate total does not imply that credits or liabilities can move between registrations.
When comparing registrations, useful dimensions include return frequency, state and tax-head ledger balances, outward-supply mix and volume, shared-service use, open GSTR-2B mismatches, and year-end differences. The treatment of a difference depends on its facts and applicable rules; the same apparent mismatch need not have the same remedy for every state registration.
Portal functionality, forms, return rules, and law can change. The cited portal and CBIC materials were reviewed on October 4, 2026; verify the live portal calendar, current consolidated law, and applicable-year forms before filing or deciding a transaction-specific tax position.
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