Huffman was accused of paying a consultant, Rick Singer, $US15,000 disguised as a charitable donation to boost her daughter's SAT score. Authorities say the 56-year-old actress also discussed going through with the same plan for her younger daughter, but ultimately decided not to.
Other parents charged in the scheme include prominent figures in law, finance, fashion, the food and beverage industry and other fields.
It's the biggest college admissions scandal ever prosecuted by the US Justice Department, embroiling elite universities across the country and laying bare the lengths to which status-seeking parents will go to secure their children a coveted spot.
Singer met with Huffman and her husband, 69-year-old actor William H Macy, at their Los Angeles home and explained to them he "controlled" a testing centre and could have somebody secretly change their daughter's answers, authorities say.
Singer told investigators Huffman and her husband agreed to the plan.