The teenager is set to remain at Loftus Road until the end of the season and goes straight into Paulo Sousa's squad for Saturday's clash with Southampton.
The Morocco international is delighted to have joined the Rs and is relishing the prospect of regular first team football in the Championship.
"Harry Redknapp told me that Tottenham are not really in a position to give young players like me an opportunity right now, and he said that QPR were keen on me," Taarabt told the club's official website.
Experience"He told me to come here and show what I can do. As soon as he told me about the move, I was interested.
"Other Championship clubs came in for me also, but QPR is a team that plays football in the way that I like to play it, so this is why I wanted to come here.
"I said 'yes' straight away. This is good for me.
"I have come here to learn, and I know that the physical side is something I will need to handle. It will be good for my experience and for my development."