The rise of tax credits: How Arizona created an alternative to school vouchers — and why they’re spreading

Matt Barnum:

With its recent adoption of a tax credit scholarship program, Illinois became the 18th state to adopt an innocuously named — but highly controversial — policy that critics have described as a “backdoor voucher.”

In some sense, the description is apt. But by injecting a middle layer into the government’s support of private school tuition, tax credits help avoid some of the legal and political obstacles that have dogged efforts by advocates, like Education Secretary Betsy DeVos, to promote school choice through vouchers.