Speaking to TV Guide, Kohan explained that she thinks it would be the right time for the series to finish.
"In my mind, [the seventh season] is [the final season]," she said. "Everyone's contract is up next year, [including] the actors and mine. Seven years is a good run, and I'd rather leave while on top. I'd never say never, but I have a feeling this might be it."
Kohan admitted that she has mixed feelings about bringing the show to a close, saying: "It's very strange and exciting and scary and sad in a lot of ways. We have such an extraordinary team.
"I would hope to take everyone over to [my] next project, including some of the actors if possible. I think it's such a strong group of people across the board. That will be very hard to let go of. However, I think growth is an obligation of a writer and it's time to stretch my wings."
Kohan also confirmed that she has already planned an ending for the series.
"I do [have an ending], which I would never reveal," she said. "There are two versions of the end of the series that I've had in mind, and it would be figuring out which way to go."