Taxpayer not allowed research and development credit, under A.R.S. 43-1168, where the Taxpayer relies on unsubstantiated estimates of research expenditures from an acquired company in years preceding the acquisition of such company to calculate the credit.
Taxpayer did not use its investment account in its regular trade or business so its investment income was not business income. Reimbursement of shared business expenses from a co-tenant was business income.