Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesAfter changing invoicing, accounting, or return-preparation processes, reconcile from original invoice records to GSTR-1, GSTR-3B, and GSTR-2B—then resolve each difference by cause before filing or making a correction. The right correction route depends on the tax period, what has already been filed, and whether the issue concerns outward supplies, input tax credit (ITC), or tax payment.
Start by defining the change and the affected periods
Before comparing returns, establish what changed and which records it may have affected. A software migration, new invoice-numbering rule, revised tax-code mapping, staff handover, or different filing cut-off can create gaps that look like tax differences. Keep those separate from genuine changes in supplies, rates, or timing.
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- Record the process-change date, systems involved, affected GSTINs, and tax periods.
- Note the last invoice number or sequence in the old process and the first in the new one. Identify gaps, overlaps, resets, or duplicate sequences.
- Preserve a controlled list of source invoice IDs, credit notes, debit notes, and any records manually added or adjusted during migration.
- Identify which system or record is the source of truth for each field, including invoice number, date, recipient GSTIN, taxable value, tax rate, tax amount, and place of supply.
These are practical reconciliation controls, not a prescribed GST Portal checklist. The objective is to trace each filed amount back to a source record and explain every difference.
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Know what each return or statement tells you
| Record | What to reconcile | How to use it |
|---|---|---|
| Sales register and original tax invoices | Source invoice details, notes, supplies, and tax calculations | Use these as the transaction-level evidence for outward-supply checks. |
| GSTR-1 | Outward-supply details and amendments | Compare its reported records with the sales register and original invoices. GST Portal GSTR-1 guide and FAQs. |
| GSTR-3B | Summary liability, eligible ITC, and tax payment | Compare summary amounts with reconciled source records. Liability data is populated using GSTR-1, GSTR-1A, or IFF, but generated values still need review. Lok Sabha Public Accounts Committee report on GST return filing and system changes. |
| GSTR-2B | Supplier-reported inward-supply documents and ITC categories | Match purchase records and supplier invoices to the relevant statement, including amendments and credit notes. The statement distinguishes available, reversal, and unavailable credit; it does not by itself establish that a claim meets every legal condition. GST Portal FAQs on Form GSTR-2B. |
GSTR-1 must be filed before GSTR-3B for a tax period, a requirement effective from 1 October 2022. The Government of India stated: “Filing of GSTR-1 has been made mandatory before filing of GSTR-3B for a tax period with effect from 01.10.2022.” Government of India Parliamentary answer.
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Reconcile outward supplies from invoices to GSTR-1
Compare the sales register against original invoices and the outward-supply records in GSTR-1. Check records at invoice level where possible; matching only total tax or taxable value can conceal a wrong recipient, duplicate, or misclassified supply.
- Recipient GSTIN, invoice number, and invoice date
- Taxable value, tax amounts, and applicable tax classification
- Place-of-supply classification
- Credit and debit notes, exports, and other relevant supply categories
- Amendments and whether the amended record is reflected as intended
Investigate missing, duplicated, or altered records rather than forcing totals to agree with a manual adjustment. Preserve the original record and the reason for any correction.
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Reconcile liability in GSTR-3B
Once outward supplies are reconciled, compare the resulting liability totals and other applicable liability components with GSTR-3B. The GST system uses GSTR-1, GSTR-1A, or IFF data to populate liability in GSTR-3B. Check the generated information against source records and resolve differences before filing; auto-population is not a substitute for review.
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Match purchase records to GSTR-2B and review ITC
Compare the purchase register and supplier invoices with the GSTR-2B relevant to the period being reviewed. A supplier document can appear in the next applicable GSTR-2B rather than the statement corresponding to the invoice date, so do not treat an invoice-date and statement-period difference as proof of an error.
Review whether documents appear as available, subject to reversal, or unavailable credit. Then assess ITC eligibility and any required reversals under the applicable provisions using the underlying facts and records. GSTR-2B is an important matching statement, not a complete legal eligibility determination.
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For inward invoices, the Invoice Management System (IMS) provides recipient actions to accept, reject, or keep records pending. Use those actions as part of document review, not as proof by themselves that ITC satisfies all legal conditions. The Government of India Parliamentary answer records IMS introduction in late 2024. Government of India Parliamentary answer.
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Classify each mismatch before choosing a correction
Give each exception a cause and an owner. This makes it easier to distinguish a migration defect from a supplier-side reporting issue or a genuine tax-period difference.
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- Missing supplier filing or late reporting: Contact the supplier, request the appropriate filing or correction, and retain the response. Recheck the next applicable GSTR-2B.
- Wrong GSTIN or invoice data: Identify whether the error is in your source records or the supplier’s reporting. Route supplier-side errors to the supplier and track the correction.
- Duplicate or migration record: Trace both entries to source documents and document which record is valid. Check that a duplicated import has not affected the return.
- Amendment or credit note: Link the changed document to the original transaction and confirm the amendment or note is reflected in the relevant return or statement.
- Classification, tax, or value error: Recheck the underlying transaction, mapping, and calculation rather than changing a return total without support.
- Genuine timing difference: Record the reason and expected period of appearance, especially where supplier reporting determines the GSTR-2B statement period.
Choose the correction window based on the tax period
Current-period outward-supply correction through GSTR-1A
GSTR-1A is an optional, once-per-tax-period facility to add a missed outward-supply record or amend a record in GSTR-1 for that same period. It becomes available after GSTR-1 has been filed or its due date has passed, whichever is later, and before filing GSTR-3B for that period. Changes made through GSTR-1A populate the taxpayer’s GSTR-3B; the recipient’s ITC for those records appears in the next tax period’s GSTR-2B. The GST Portal describes its purpose and workflow in the GSTR-1 guide and FAQs and GSTR-2B FAQs. GSTR-1A was introduced in August 2024, according to the Government of India Parliamentary answer.
Older periods and other kinds of error
Do not treat GSTR-1A as a general route for every prior-period issue. The applicable amendment route and time limit depend on the period, return status, error, and circumstances; the cited portal instructions make amendments subject to the CGST Act time limit. Check the current Act and rules for the relevant case before acting. If the issue concerns ITC or tax payment rather than an outward-supply record, establish the applicable correction route separately.
Where the amount or eligibility is material, have a qualified GST professional review the reconciliation and proposed correction. A general workflow cannot determine the right route without the tax period and facts.
Build controls into the new process and close the period
Use the change as an opportunity to compare the old and new workflows across the points most likely to break invoice-to-return traceability:
- Who owns each source record and which system is authoritative
- Invoice identifiers and numbering continuity
- GSTIN and place-of-supply mappings
- Tax-rate and taxable-value calculations
- Posting and filing cut-offs
- Amendment and credit-note handling
- Import and export completeness
- Audit trail, exception ownership, and approval of manual adjustments
Close the reconciliation by retaining before-and-after exports, mapping rules, an invoice-level exception log, supplier confirmations, return summaries, payment or credit notes, and approval records for manual adjustments. Each exception should have an explanation and disposition; do not carry an unexplained difference into a later period.
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