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For an Indian GST audit, assessment or appeal, keep the books that support each return and the source document that lets an officer trace every figure or tax position back to the underlying transaction. File the records by financial year, return period, GSTIN, registered place of business and issue, then preserve the notice, your response, filing proof and the authority’s outcome with the same case file.
The exact request depends on the notice, tax period and State or Union Territory rules. The checklist below covers the core records under the Central GST framework and shows what to add for an audit, scrutiny or appeal.
Start with a notice-controlled document file
Do not send an identical bundle for every GST matter. First extract five limits from the notice or order:
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- the financial year and return periods;
- the GSTIN and registered place of business covered;
- the transaction or issue, such as turnover, tax rate, exemption, input tax credit, refund or stock;
- the records and explanations specifically requested; and
- the response, payment and filing deadline.
Create a matter index using those limits. Put a copy of the notice or order at the front, followed by an issue list, a document register and numbered files. Keep originals or reliable electronic copies, and record where each item came from. This prevents a large volume of unrelated invoices from obscuring the evidence that answers the actual question.
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Keep the opening and closing story connected
A return-period file must explain more than transactions occurring during that period. Preserve documents that explain opening balances, later amendments, credit or debit notes, adjustments, payments, refunds and closing balances. If a figure changes in a later period, cross-reference both periods so an officer can follow the complete trail.
Statutory records and the retention clock
Section 35 of the Central Goods and Services Tax Act requires a registered person to keep true and correct accounts at the principal place of business. The rules add activity-specific records and supporting documents, including invoices, bills of supply, debit and credit notes, delivery challans, receipt, payment and refund vouchers, and relevant e-way bills. Records should be maintained at each related registered place of business. See the CBIC CGST Act and CBIC Accounts and Records Rules.
General 72-month period
Section 36 sets the ordinary retention period at 72 months from the due date for furnishing the annual return for the year to which the accounts and records relate. The period runs from the annual-return due date, not simply from the date of an invoice or the end of the financial year.
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If the records relate to an appeal, revision, other proceeding or the specified investigation, retain them until the later of the general statutory period or one year after final disposal of that matter. Do not destroy a relevant file merely because six years appears to have passed while the proceeding is still pending. Mark the file with the disposal date and the later destruction date calculated under section 36.
These are statutory periods under the Central framework. Amendments, notifications and State or Union Territory provisions can affect a live case, so check the law and the period named in the notice before disposing of records.
Core documents to keep for any GST matter
The following sets form the base file. Keep only the categories that apply to the business, but do not omit a category merely because the return itself contains a summary number.
| Record set | What to retain | What it establishes |
|---|---|---|
| Books and ledgers | Sales and purchase registers, general ledger, trial balance and relevant financial statements | How return totals arise in the accounting system and how balances roll forward |
| Supply documents | Tax invoices, bills of supply, credit notes, debit notes and delivery challans for inward and outward supplies | The supplier or recipient, value, tax treatment, amendment and movement of goods or services |
| Settlement evidence | Receipt, payment and refund vouchers, bank references and evidence of tax payments | That consideration, refunds or tax liabilities were actually settled |
| Movement records | E-way bills and transport or delivery records where relevant | Dispatch, receipt and movement details that support the supply documents |
| Inventory records | Stock accounts for opening balance, receipts, supplies, losses, theft, destruction, write-offs, gifts or samples and closing balance; separate raw material, finished goods, scrap and wastage where relevant | Quantity reconciliation and the treatment of unusual stock movements |
| Special transactions | Import and export records, reverse-charge supply records and documents supporting those transactions | Customs or cross-border facts and the basis for reverse-charge tax |
| Returns and workpapers | GST returns and statements, book-to-return reconciliations, and calculations supporting turnover, rates, exemptions, deductions, input tax credit and refunds | The method used to arrive at each reported tax position |
| Procedural history | Notices, audit communications, document requests, correspondence, submissions, delivery or filing proof, findings and orders | What the authority asked, what was supplied and how the matter progressed |
Build a traceable electronic record system
Electronic records are acceptable only if the business can produce them in a readable and authenticated form. The accounts-and-records rules also address backups and an audit trail linking source documents with the financial accounts. A spreadsheet total without the underlying invoice, voucher or system history is not a dependable audit trail.
- Use a stable folder hierarchy. A practical path is
Financial year / GSTIN / place of business / return period / issue, with subfolders for books, source documents, reconciliations, correspondence and payments. - Give each document a persistent identifier. Use invoice or voucher numbers already used in the books; do not rename files in a way that breaks the accounting-system reference.
- Preserve readable exports. Retain the original electronic file where possible and an export that an officer can open without proprietary software. Keep the metadata or report parameters needed to reproduce a ledger or return extract.
- Back up independently. Keep effective, tested backups rather than a second copy on the same device. Record the backup date and restore-test result.
- Protect authenticity. Restrict editing, retain access logs or version history where available, and document corrections through the accounting system instead of silently replacing a file.
- Create an index. Map every return line, reconciliation adjustment and disputed amount to the ledger account and source-document range.
When handing over electronic records, provide a short read-me file explaining file formats, accounting periods, software-generated reports, naming conventions and the person who can answer system questions.
Documents for a GST audit
Under the CBIC audit rules, the audit notice is FORM GST ADT-01 and the audit findings are recorded in FORM GST ADT-02. The audit tests the source documents behind the books and returns, including turnover, exemptions and deductions, tax rates, input tax credit availed and used, refund claims and other relevant matters. The applicable procedures are set out in the CBIC Assessment and Audit Rules.
Assemble an audit working file
- Place ADT-01 and its document request at the front, then make a checklist matching every requested item.
- Prepare a return-to-ledger reconciliation for each cited period. Explain timing differences, amendments, credit or debit notes, exempt or non-GST amounts and rounding or classification differences.
- For each issue, attach the relevant invoices, vouchers, contracts or delivery records, followed by the ledger extract and the return line where the amount was reported.
- For input tax credit, retain the purchase register, tax invoices, reversal or re-credit workings, payment evidence where relevant and the return calculations that show credit availed and used.
- For refunds, retain the claim, statements, export or other underlying documents, payment evidence and the calculation supporting the amount claimed.
- For inventory questions, provide stock ledgers and records of receipts, supplies, losses, theft, destruction, write-offs, gifts, samples, scrap and wastage.
- Log every submission, meeting and clarification. Keep the authority’s discrepancy communication, your response and the evidence supplied with the final ADT-02 findings.
Audit timing to track
The Act provides at least 15 working days between the audit notice and the audit. It also provides a standard three-month completion period, extendable by up to a further six months for recorded reasons. Put these dates in a timeline, while following any dates and directions in the actual communication.
Documents for assessment and return scrutiny
Return scrutiny commonly uses FORM GST ASMT-10 for a discrepancy notice and FORM GST ASMT-11 for the taxpayer’s explanation or response. For provisional assessment, FORM GST ASMT-06 calls for information and records needed to finalise the assessment. The form names come from the CBIC Assessment and Audit Rules.
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Respond to a scrutiny discrepancy
- Save ASMT-10, the cited return and the exact discrepancy text.
- Extract the affected ledger accounts, invoice ranges and reconciliation lines for the stated period.
- Prepare a point-by-point explanation. Put the source documents immediately behind the paragraph that relies on them.
- If the discrepancy is accepted, retain the payment challan or other payment evidence and the revised calculation.
- File ASMT-11 and preserve the acknowledgment, portal reference, attachments and any later communication.
Prepare for provisional assessment
For an ASMT-06 request, provide the information needed to resolve the uncertainty identified by the officer, such as the valuation or rate basis, transaction documents and calculations. Keep the request, every submission and proof of delivery together. A form example does not create a universal checklist; the period, issue list and records specified in the notice control what must be produced.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Documents for a GST appeal
An appeal to the Appellate Authority is filed in FORM GST APL-01. The appeal rules require a certified copy of the decision or order and supporting documents. The governing procedures are in the CBIC Appeal Rules.
Build the appellate record
- the challenged order and proof of the date it was communicated;
- the original notice, relied-upon documents and submissions made during adjudication;
- documents already produced below, arranged by the issues raised in the order;
- the appeal form, statement of facts, grounds, annexures and authority or filing acknowledgment; and
- proof of admitted-tax payment and the required pre-deposit.
Section 107 generally gives a taxpayer three months from communication of the decision or order to appeal. The Appellate Authority may allow a further one month for sufficient cause. For the appeal described in the provision, the appellant must pay the admitted amount and make a pre-deposit equal to 10% of the remaining disputed tax. Confirm the amount, payment route and any current procedural change for the specific order before filing.
Control additional evidence
Additional evidence is restricted at appeal except in the circumstances listed in the rules. If you need to rely on a document that was not produced earlier, preserve the document itself and a written explanation of why it could not be produced before, along with any proof supporting that explanation. Do not assume that an item omitted during adjudication can automatically be added to the appeal bundle.
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Reconcile before submitting anything
A strong file lets a reviewer start with a disputed number and work backward. For every material amount, record the path from return or order to reconciliation, ledger, voucher, invoice and—where relevant—bank, transport, stock, import or export evidence. Use a separate schedule for differences caused by period timing, amendments, credit notes, classification, exemptions, rate changes, reverse charge or input-tax-credit reversals.
Have a second reviewer check that totals agree, attachments open, page numbers match the index and every statement in the submission has evidence. Keep the signed or approved final version so later edits cannot create uncertainty about what was filed.
Common retention and response failures
- Keeping only returns: Returns are summaries. Preserve the source records and the workpapers that explain how each figure was calculated.
- Mixing GSTINs or premises: Separate files by registered place and GSTIN, then cross-reference shared systems or centralised records.
- Deleting a pending-period file: Apply the longer pending-proceeding rule, even when the ordinary 72-month period has apparently ended.
- Using an untraceable spreadsheet: Link spreadsheet cells to ledger reports and source documents, and retain the version used for the filed response.
- Ignoring stock evidence: Keep records for losses, theft, destruction, write-offs, gifts, samples, scrap and wastage, not only purchase and sales quantities.
- Missing procedural proof: Save portal acknowledgments, email delivery records, challans, pre-deposit proof and the date an order was communicated.
- Sending excess material: Follow the notice’s period and issue list. A focused, indexed bundle is easier to verify than an unstructured archive.
Final pre-submission checklist
- Does the file identify the correct GSTIN, place of business, financial year and return period?
- Can every disputed or reported figure be traced from return or order to ledger and source document?
- Are invoices, notes, challans, vouchers, e-way bills and stock records included where relevant?
- Are import, export, reverse-charge, refund and input-tax-credit documents included where the issue requires them?
- Are reconciliations and explanations tied to numbered evidence?
- Are the notice, response, acknowledgment, payment proof and final finding or order preserved together?
- For an appeal, is the certified order, communication proof, prior record, grounds, attachments and pre-deposit evidence ready?
- Can electronic records be opened, read, authenticated and restored from backup?
- Has the retention end date been calculated from the annual-return due date and extended for any pending proceeding?
Use the specific notice or order as the controlling checklist, and verify the current Central, State or Union Territory requirements before filing or destroying records.
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