The state of Arizona offers its taxpayers the opportunity to make contributions to schools and non-profit organizations (QCO) that reduce the amount of tax owed to the state or increase the amount of the taxpayer’s refund, dollar-for-dollar. There is NO NET COST to the donor and deserving individuals around the state benefit. There are three main communities tax credit donations serve, and donors can contribute to any or all of them. Shoebox is a Qualifying Charitable Organizations (QCO). Our QCO code is 20307.