The New York State United Teachers union this week is countering Gov. Andrew Cuomo’s latest push for the education investment tax credit with a new radio ad knocking the proposal.

The ad, which starts airing today, will run for the next 10 days, NYSUT said in a statement.

The minute-long spot frames the tax credit as one that helps the rich through the backing of private schools.

“We don’t need another giveaway to the rich,” said NYSUT President Karen Magee. “What we need is a fair approach to education funding that benefits all students.”

The ad comes as Cuomo has introduced a revamped version of the legislation that is aimed at bolstering donations to public schools as well as private-school scholarship programs.

Cuomo on Sunday pitched the proposal in Brooklyn and on Long Island as a matter of parental choice. The $150 million program would also provide tax credits to teachers who purchase school supplies.

The tax credit has been long sought by parochial schools and the Catholic Church, who say it can prevent struggling schools from closing.

Initially tied to the passage of the DREAM Act in the state budget by Cuomo, the package fell out of the budget negotiations in March.

The Republican-led Senate previously passed a version of the tax credit legislation, but it faces an uphill climb in the Democratic-led Assembly.

But the measure remains opposed by the teachers union, who see it as a way of creating a back-door voucher program and not funding public schooling at appropriate levels.

The union’s radio ad features a character named “Mr. Moneybags” who frames the tax credit as a way of favoring “us ‘zillionaires’ and our exclusive schools.”

NYSUT is regrouping after last month’s budget agreement dealt a blow to teacher tenure by making it harder and longer to obtain, as well as making it easier for school districts to fire teachers deemed to be low performing, despite tenure.

The budget also created a new teacher evaluation system that relies on a mix of in-classroom observation and at least one standardized test to assess performance.

The Board of Regents is due to determine how much weight to give the test versus observation by June 30, though lawmakers are pushing bills that would extend that deadline.