Australia R&D Tax Incentive (Income Tax Assessment Act 1997 Division 355) ITAA36-262A: ITAA 1936 s 262A Keep records that explain the R&D claim, in English, for 5 years

A company carrying on business keeps records that record and explain all transactions and other acts relevant to the income tax law, including documents on income and expenditure and the particulars and basis of any election, estimate, determination or calculation (such as R&D apportionments, the offset and clawback calculations), in English or readily convertible to English, so that its liability can be readily worked out, and retains them for 5 years after they were prepared or obtained or the transactions completed (longer where the amendment period is extended). The R&D Tax Incentive Guide to Interpretation (guidance) expects contemporaneous records showing the hypothesis, experiments, observations, evaluation and conclusions of each activity, and records of eligible expenditure.