Keep records longer for losses
You must keep proper records relating to your tax affairs for at least five years.
If you use information from those records in a later tax return, you may have to keep records for longer. So, if you carry forward a tax loss, you must keep the records until the end of any period of review for the income tax return in which the loss is fully deducted.
Taxation Determination TD 2007/2External Link – Income tax: should a taxpayer who has incurred a tax loss or made a net capital loss for an income year retain records relevant to the ascertainment of that loss only for the record retention period prescribed under income tax law?
You must keep records relating to your tax affairs for at least five years after preparing or obtaining them, or after you completed the relevant transactions or acts, whichever is later. If you carry forward a tax loss, you may have to keep records for longer.