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Indirect Tax Laws and Practice · Accounts and Records

Retention Period of Accounts and Special Audit under GST

Updated 11 October 2026 · Fact-checked

Under section 36 of the CGST Act, a registered person must keep books and records until 72 months after the due date of the annual return for that year. If an appeal, revision, proceeding or offence investigation is pending, keep the related records for one year after final disposal, or the 72 months, whichever is later.

Understand Retention Period, Audit and Special Cases

Section 35 tells you what accounts to keep. Section 36 tells you how long to keep them. Rule 56 adds the detail on what records, where and in what form. The retention rule is a time limit counted from a fixed date, not from the date you made the entry.

The base rule is simple. Keep books and records until seventy-two months have expired from the due date of furnishing the annual return for the year to which the accounts relate. The clock starts from the due date, not from the date you actually file. So late filing does not extend the period.

The proviso covers a person who is a party to an appeal, revision or any other proceedings before an Appellate Authority, Revisional Authority, Appellate Tribunal or court. It applies whether he filed it or the Commissioner did. It also covers a person under investigation for an offence under Chapter XIX. Such a person must retain records of the subject matter of that matter for one year after final disposal, or for the 72-month period, whichever is later.

Notice what the proviso does not do. It does not cover all records; only those pertaining to the subject matter. It does not replace the base period; it sets a floor, and you take the later of the two dates.

The audit angle comes from section 66. An officer not below Assistant Commissioner can, with the Commissioner's prior approval, direct special audit by a chartered accountant or cost accountant nominated by the Commissioner. This is why a cost accountant must know records rules: you may be the auditor, and the records must be there to audit. Rule 56(16) also links preservation to section 36 and says where records must be kept.

Key rules to remember

Basic retention period (section 36)
Retain until 72 months from the due date of the annual return for the year of the accounts
Counted from the due date, not the actual filing date.
Retention when proceedings are pending (proviso to section 36)
Later of: (a) 1 year after final disposal of appeal, revision, proceedings or investigation; (b) the 72-month period
Applies only to records pertaining to the subject matter of the appeal, revision, proceedings or investigation.
Special audit trigger (section 66(1))
Officer not below Assistant Commissioner + prior approval of Commissioner + opinion that value is not correctly declared or credit availed is not within normal limits
Auditor is a chartered accountant or cost accountant nominated by the Commissioner.
Special audit report time (section 66(2))
Report within 90 days; extendable by a further 90 days
Extension by the Assistant Commissioner on application by the registered person or the auditor, or for material and sufficient reason.
Rule 102 forms
Direction in FORM GST ADT-03; findings communicated in FORM GST ADT-04
Rule 102 of the CGST Rules.
Preservation and place (Rule 56(16))
Preserve per section 36; manual records at every related place of business; digital records accessible at every related place of business
Applies to accounts with invoices, bills of supply, credit and debit notes and delivery challans.

How to solve Retention Period, Audit and Special Cases questions

Use this method for any question on retention, audit or related records.

  1. 1Identify the financial year of the accounts and find the due date of the annual return for that year.
  2. 2Add 72 months to that due date. This gives the base retention date.
  3. 3Check whether any appeal, revision, proceeding or investigation under Chapter XIX is pending for the records in question.
  4. 4If yes, work out one year after final disposal for the subject-matter records. Compare it with the base date and take the later.
  5. 5If the question mentions special audit, check the officer rank, prior approval of the Commissioner, the grounds, and the 90 plus 90 day report timeline.
  6. 6Check Rule 56 for where and how the records must be kept, including electronic form and log of edits.
  7. 7State the conclusion clearly with the section number and a date or period.

Quickest way: Later-of-two-dates check

When to use it: For MCQs and short case questions asking until when records must be kept.

  1. Write the annual return due date plus 72 months.
  2. Ask: is any proceeding pending on these records?
  3. If no, that date is the answer.
  4. If yes, add one year to the final disposal date for those records.
  5. Pick the later date. Apply it only to the subject-matter records.

Common mistakes in Retention Period, Audit and Special Cases

  • Counting 72 months from the date the annual return was actually filed.

    Students link retention to filing, which feels natural.

    Fix: Section 36 counts from the due date of furnishing the annual return. Late filing does not extend it.

  • Counting 72 months from the end of the financial year.

    Confusion with other limits that run from year end.

    Fix: Always start from the annual return due date for that year's accounts.

  • Saying the one-year-after-disposal period replaces the 72 months.

    The proviso sounds like a separate rule.

    Fix: Take the later of the two. If 72 months ends later, that date stands.

  • Applying the proviso to all books of the person.

    Students read 'party to appeal' broadly.

    Fix: The proviso covers records pertaining to the subject matter of the appeal, revision, proceedings or investigation only.

  • Saying special audit can be ordered by any officer on his own.

    Section 66 conditions are skipped.

    Fix: Officer must be not below Assistant Commissioner, with prior Commissioner approval, and the auditor is nominated by the Commissioner.

  • Thinking a prior audit under another law bars special audit.

    Assumption that one audit is enough.

    Fix: Section 66(3) says special audit applies even if accounts were audited under any other provision or law.

Worked examples

Example 1

Rahul Traders, Pune, has accounts for a year whose annual return was due on 31 December 2025. No proceedings are pending. Until what date must the books be retained?

Show the solution
  1. The base rule is 72 months from the due date of the annual return.
  2. Due date is 31 December 2025.
  3. 72 months is 6 years.
  4. 6 years after 31 December 2025 is 31 December 2031.

Answer: Rahul Traders must retain the books until 31 December 2031 (expiry of 72 months from the annual return due date).

Example 2

For a year whose annual return was due on 31 December 2025, Meena Industries is party to an appeal over its input tax credit. The appeal is finally disposed of on 30 June 2032. Until when must it retain the records of that credit? What if the appeal were disposed of on 31 March 2031?

Show the solution
  1. Base period: 72 months from 31 December 2025 ends on 31 December 2031.
  2. Case 1: one year after final disposal on 30 June 2032 is 30 June 2033.
  3. Compare 30 June 2033 with 31 December 2031. The later is 30 June 2033.
  4. Case 2: one year after 31 March 2031 is 31 March 2032.
  5. Compare 31 March 2032 with 31 December 2031. The later is 31 March 2032.
  6. The proviso applies to records pertaining to the subject matter of the appeal.

Answer: Case 1: until 30 June 2033. Case 2: until 31 March 2032. In both cases the later of the two dates applies, for the subject-matter records.

Exam tips

  • Practise date-based MCQs: always start from the annual return due date, then add 72 months.
  • Learn the 90 plus 90 day limit and who may extend it; examiners like numbers from section 66.
  • In case scenarios, check whether the pending matter relates to the records in question before applying the proviso.
  • Quote section 36, section 66 and Rule 56(16) by number in descriptive answers, and add a one-line conclusion.
  • Remember the Rule 102 forms: ADT-03 for direction, ADT-04 for findings.

Practice questions from Accounts and Records

Retention Period, Audit and Special Cases in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Retention Period, Audit and Special Cases: frequently asked questions

How long must books of accounts be retained under GST?

Until 72 months from the due date of furnishing the annual return for the year of the accounts, under section 36 of the CGST Act. The period runs from the due date, not the actual filing date.

What if an appeal is pending when the retention period ends?

Retain the records pertaining to the subject matter of the appeal for one year after its final disposal, or for the 72-month period, whichever is later. The same applies to revision, other proceedings and investigation of an offence under Chapter XIX.

Who can order a special audit under GST?

An officer not below the rank of Assistant Commissioner, with the Commissioner's prior approval, if he thinks the value is not correctly declared or credit availed is not within normal limits. The auditor is a chartered accountant or cost accountant nominated by the Commissioner.

What happens if a registered person fails to account for goods or services?

Under section 35(6), the proper officer determines tax on the goods or services not accounted for, as if they had been supplied by that person. Sections 73, 74 or 74A apply mutatis mutandis to determine the tax.