Financial Assets Investing....tax, page-6

Regardless of whether you are a 'share trader' or 'share investor' dividends should be reported under the dividend label of the tax return and not the business section.

However, the amount of net business income reported at label 15 does need to be adjusted by the dividends related to your 'share trader' business for the small business income tax offset questions.

Given the complexity in preparing tax returns I suggest getting a registered tax agent to prepare your return. That way they can look at things such as whether it will be beneficial to calculate closing stock at cost or market value etc.