The credits allowed under chapter 10, article 5 of this title are allowed against the tax due under this chapter to the extent the credit is derived from items otherwise included in computing Arizona small business gross income. To the extent the credits allowed by this section exceed the tax due under this chapter for the taxable year, the excess amount of the credits claimed by the Arizona small business is allowed as a credit against the tax imposed on the small business taxpayer under chapter 10 of this title.
A.R.S. § 43-1742