2015–2020: Schitt's Creek
In 2015, Levy formed Not a Real Company Productions (with his father Eugene Levy and principals Andrew Barnsley and Fred Levy). Their first project was a television pilot with CBC, which resulted in Schitt's Creek. Levy starred in the series alongside his father, sister Sarah Levy, Catherine O'Hara, Annie Murphy, and Chris Elliott. Schitt's Creek is Not a Real Company Productions' first television series. Levy has spoken publicly about his character's portrayal of pansexuality, saying, "I think in certain parts of America, David's sexual ambiguity was a big question mark. (But) it was issues like that that I find quite exciting."
For his work on Schitt's Creek, Levy has been nominated for numerous awards, including several Canadian Screen Awards for writing and acting, winning the awards for Best Comedy Series, Best Writing in a Comedy Program or Series in 2016, and Best Comedy Series in 2019. In 2019, the series was nominated for the Primetime Emmy Award for Outstanding Comedy Series. In March 2019, Levy announced that the series was renewed for a sixth and final season, and said the decision to end the series after season six on their own creative terms was a "rare privilege".
In July 2017, it was announced that Levy would host The Great Canadian Baking Show with Julia Chan, which had its premiere on November 1 on CBC. On October 30, John Doyle of The Globe and Mail criticized the show's first episode in a review, including a critique of Levy's "feyness" while performing as host. While acknowledging the importance of criticism in media, Levy called the use of the word feyness "offensive, irresponsible, and homophobic". The Globe's public editor Sylvia Stead published a statement on November 9 explaining that "Mr. Doyle was not aware that Mr. Levy was gay and he used the term to mean preciousness". She also acknowledged that, despite the dictionary not defining "fey" as a slur, "we need to understand not just the context of words, but how they evolve and are viewed by communities that may be justly sensitive to a range of meanings." Levy and Chan returned as hosts for the series' second season, which premiered in September 2018. In March 2019, Levy announced via Twitter that he and Chan would not be returning as hosts for the series' third season, citing scheduling conflicts.
In May 2019, he was the keynote speaker at The Infatuation's annual food festival, EEEEEATSCON.
In June 2019, to mark the 50th anniversary of the Stonewall riots that sparked the start of the modern LGBTQ rights movement, Queerty named him one of the Pride50 "trailblazing individuals who actively ensure society remains moving towards equality, acceptance and dignity for all queer people".
In January 2020, he and his father Eugene Levy were guest hosts of The Ellen DeGeneres Show, filling in for DeGeneres while she took a day off. They did many of the ordinary host activities including interviewing fellow Schitt's Creek cast members Catherine O'Hara and Annie Murphy.
In July 2020, Schitt's Creek was nominated for 15 Primetime Emmy Awards for its final season, with Levy winning Outstanding Comedy Series, Outstanding Supporting Actor in a Comedy Series, Outstanding Writing for a Comedy Series, and Outstanding Directing for a Comedy Series. It became the first comedy series to sweep the four main acting categories in a single year, the first comedy or drama series to win all seven major awards in a single year, and the most-awarded comedy in a single year, beating The Marvelous Mrs. Maisel's record. Levy also became the first person to win an award in all four major disciplines in a single year.
