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Tax and accountingCommonwealthMinimum retention

Capital gains tax records

How long should Australian businesses keep capital gains tax records, and when does the clock start?

Keep for5 years after no further CGT event can happen
Clock startsNo further CGT event can happen
Applies toOwners of CGT assets

General information, not legal advice or permission to destroy a record. Coverage may be incomplete or out of date. Check the official text, other applicable obligations and any investigations, disputes or legal holds before disposal. Get advice for your situation. Terms of use.

Under the Income Tax Assessment Act 1997, owners of CGT assets must keep capital gains tax records for at least 5 years after no further CGT event can happen. Clock starts: no further CGT event can happen.

Records of every act, transaction or event relevant to working out a capital gain or loss.

4 provisions of the Income Tax Assessment Act 1997 apply to these records. Each one is set out below.

The terms

s 121-25(1)–(2)Income Tax Assessment Act 1997
5 years
until the end of 5 years after it becomes certain that no CGT event (or no further CGT event) can happen
s 121-20(1)Income Tax Assessment Act 1997
No period stated
Start not stated
s 121-35(1)(b)Income Tax Assessment Act 1997
5 years
after the requirement in paragraph (2)(b) is satisfied
s 100-70Income Tax Assessment Act 1997
5 years
after a CGT event has happened

Conditions and exceptions Caution

The 5 years run from when it becomes certain that no CGT event can happen for which the records could be relevant (s 121-25).

From the provisions:

  • The Commissioner notifies you that you do not need to retain them
  • For a company that has finally ceased to exist
  • Only applies to records reasonably expected to be relevant to working out a capital gain or loss from a CGT event
  • Exceptions set out in section 121-30 (not reproduced in this provision)
  • An entry must have been made in a register in English setting out the information
  • The entry must be certified by a registered tax agent or person approved by the Commissioner

The law

Income Tax Assessment Act 1997, s 121-25(1)–(2) · How long you must retain the recordsOfficial text ↗
You must retain records that section 121‑20 requires you to keep. (2) You must retain them until the end of 5 years after it becomes certain that no CGT event (or no further CGT event) can happen such that the records could reasonably be expected to be relevant to working out whether you have made a capital gain or capital loss from the event.
Text as at 27 August 2026
Income Tax Assessment Act 1997, s 121-20(1) · What records you must keepOfficial text ↗
You must keep records of every act, transaction, event or circumstance that can reasonably be expected to be relevant to working out whether you have made a capital gain or capital loss from a CGT event.
Text as at 27 August 2026
Income Tax Assessment Act 1997, s 121-35(1)(b) · Asset register entriesOfficial text ↗
retain those of the records that contain the information entered in the register for at least 5 years after the requirement in paragraph (2)(b) is satisfied
Text as at 27 August 2026
Income Tax Assessment Act 1997, s 100-70 · How long you need to keep recordsOfficial text ↗
The law requires you to keep records for 5 years after a CGT event has happened.
Text as at 27 August 2026

Other terms that apply to these records

This page covers capital gains tax records on their own. The same file is often caught by other laws as well, with different periods and start dates. See why a legal term is not a schedule.

3 records. 3 sets of rules. They don't agree.

One business file can hold all of these at once.

Capital gains tax records5y+Income Tax Assessment Act 1997, s 121-25(1)–(2), s 121-20(1), s 121-35(1)(b), s 100-70 · no further CGT event can happen
Business tax records5yIncome Tax Assessment Act 1936, s 262A(1), (4) · later of preparation or the transaction
Depreciation and roll-over records5y+Income Tax Assessment Act 1997, s 40-340(6), s 40-340(7), s 40-360(4) · the balancing adjustment event or disposal

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