Paltrow, 40, who is mother to Apple, 8, and Moses, 6, has taken small roles in "Iron Man" film series and television show "Glee".
She says she deliberately tackles just one supporting job a year because she can't juggle back-to-back filming along with her kids, reported Daily Mail.
"I look for an interesting supporting part about once a year. That's the most I can manage.
Some women can do it and that's fantastic, but I can't. You make choices as a wife and mother, don't you? You can't have it all," she said.