The School Tax Credit Donation Portal consists of a color coded map of every school district in Maricopa County. This tax credit is claimed on Form 335.Form Number 331 Category Tax Credits To donate, complete the form in the donation brochure or donate online. Tax credit donations go directly to the children and programs at IMAGINE PREP SURPRISE, a non-profit, tuition-free charter school. Donate to help children receive the education they need. Receive a dollar-for-dollar tax credit when donating our Arizona STO.