At least their union dues are working overtime.

While city public-school teachers have gone without a new contract or regular pay raises for three straight years, their union, its staffers and political cronies have been living large off their union dues, a Post review found.

Included in the United Federation of Teachers’ $166.5 million in spending last year was a hefty $33.4 million in salary for union staffers — a slight increase from the year prior.

More than 90 staffers earned six-figure salaries between July 2011 and June 2012, the records show — including President Michael Mulgrew, who took home $275,000.

The union, which bumped its income from membership dues by $3 million in 2012 — to $129 million — spent nearly $1 million just on training for union staffers at the Rye Town Hilton in Westchester.

The union also spent more than $1 million for one company, Lackmann Culinary Services, to cater food for its various meetings and events.

via FoxNews