Yes can claim the tax deduction for money spent on a RAT kit in the following cases:

1. You are required to take a test before undertaking work (e.g., as a mandatory requirement under an employer’s COVID mandate),

or2. You are required to travel for work interstate and the RAT is required under a State direction or health order to enter the State or return to your home state.

But of course, if you have purchased a RAT kit for private purposes (personal travel, convenience, absence of PCR testing) or you’ve been reimbursed by your employer it will not be tax-deductible.

see also ATO announcement to ensure COVID-19 Testing expenses are tax-deductible

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