The Rams and QPR will do battle at the weekend for a place in the Premier League and Forsyth believes that QPR's highly-paid, experienced squad is under more pressure.
"[QPR] came down from the Premier League last year and kept a lot of the players that played there," he told Derby's website.
"Some of their signings this season have got a lot of top flight experience as well, so I think the pressure is on them."
Forsyth, 25, has played every single game for Derby in his first full season with the Rams, with his performances at left-back earning him a first Scotland call-up.
"Since the day I signed, I don't think I could have wished for it to go any better. Hopefully it has got a happy ending to follow as well," he added.
Derby finished third in the table and then beat Brighton & Hove Albion 6-2 on aggregate to reach the final at Wembley. They are looking to return to the Premier League after six seasons in the second tier.