The assessable income of a super fund generally includes all types of income from its investments such as interest, dividends, rent and capital gains.
However, it also includes concessional contributions received on behalf of its members, which is effectively any contribution the person or employer making the contribution claims as a tax deduction.
This is why they are taxable contributions and therefore incur contributions tax of 15% (increasing to 30% for individuals with income greater than $250,000).
Some of the main types of concessional contributions are: