Contents: paper no. 1. Business income / Geoff Lehman -- paper no. 2. Derivation of income / Robert Upfold -- paper no. 3. Deductibility criteria / John Mannix-- paper no. 4. Timing of deductions (including depreciation) /Rae Vecchio -- paper no. 5. Interest deductions and capital-income issues / Richard Gelski -- paper no. 6. Trading stock / Mark Veyret