The former Manchester United and Real Madrid footballer last year ended five years in America's Major League Soccer with the LA Galaxy, leaving after winning the MLS Cup Final in December.
[David Beckham holds up his new football shirt during the Paris Saint Germain press conference at Parc des Princes, Paris]
Speaking at a press conference today (January 31), Beckham said: "One of the reasons I wanted to come to Paris was we decided on something quite unique. I won't receive any salary. My salary will go to a local children's charity.
[Paris Saint-Germain's David Beckham, Nasser Al-Khelaifi and Leonardo following a press conference at Parc des Princes, Paris]
"That's one of the things we're excited and proud to do. It's something exciting and I'm not sure it's been done before."
He added of the move: "I'm excited and it's something we've been working on for a while and I am happy it has happened.
"I chose Paris because I can see what the club are trying to do. I turned down a lot of clubs to join Paris Saint-Germain. I'm very honoured."
Of rumours linking him with a return to England, Beckham added: "I always said unless it was Manchester United I wouldn't want to play for any other Premier League team."
The midfielder will reunite with PSG boss Carlo Ancelotti, who was in charge during one of his loan spells at AC Milan in 2008.
The BBC's Ben Smith said on Twitter that Beckham will be involved in PSG's Champions League squad, giving him "one last chance to make an impact at the highest level".
Beckham had worked with Premier League side Arsenal this month to improve his fitness ahead of the move.
Watch the press conference below: