Keshia Knight Pulliam made $20k PER EPISODE to star on “House of Payne” this season … and then fired the agents who put the deal together … this according to a new lawsuit.

She is being sued by Greene & Associates Talent Agency … which claims it signed Keshia back in 2007 and immediately got her a lead role on the Tyler Perry TV show as Miranda Payne.

G&A claims it she got between $7,500 to $20k per episode … including $20k per episode for all of the 2011-12 season.

But not good enough for Keshia … because according to the suit, she fired G&A back in July.

There’s just one BIG problem … G&A claims Keshia never forked over a single cent in commission from the ‘Payne’ deal … and several other shows it worked on for her.