In general terms, for legal expenses to be deductible, they must have been incurred to generate income, or be part of normal operating expenses and can not relate to the creation, amalgamation or termination of a business or the taking over of another business.
Expenses that can be claimed for tax purposes include:
Improving employment contracts
Fees for stamping and registering leases on property
Renewals of leases
Expenses that relate to registering, renewing (and defending) patents, renewal and defending trade marks, contracts and other commercially important information
Expenses that are not deductible include:
The costs of registering new trademarks
Acquisition of capital assets
Expenses incurred in the sale of a business
Forming, registering or liquidating a company
However, from the 2010 financial year legal expenses under $10,000 are tax deductible in full.