The 29-year-old overpowered world number one Rafael Nadal 6-3 3-6 6-1 at London's O2 Arena to pocket one million pounds and draw level with Ivan Lendl and Pete Sampras for most titles at the season-ending championships.
Federer, who holds 16 Grand Slam crowns and won five tournaments in 2010, indicated he had no plans to call it quits just yet.
"I have no plans at all - stopping, quitting, whatever you want to call it," he said.
"As long as I'm healthy, eager, motivated, which clearly I am. I've played 10 full seasons in my career, nine of them I made the World Tour Finals, so I've always had long and exhausting seasons."
"But I seem to enjoy it and take pleasure out of travelling the world, playing against the best, challenging myself in practice and so forth."
"It's been an amazing career. I hope I can play for many more years. It's a goal anyway, I think it's possible."
Federer saved his best for the final in London as he steamrolled Nadal in the first and third sets to wrap up the win in one hour and 38 minutes.
"I'm really thrilled the way I played all week. To win a fifth time is obviously amazing. I'm very happy to have won such a prestigious tournament. You ask all the top guys, we love this event," the Swiss star said.
"I'm just really happy the way I was able to finish the season in style, playing some of my best tennis, really saving the best for last. I believe I can have another great season in 2011."
After a well-deserved off-season break, Federer will head to Melbourne in January where he will attempt to defend his Australian Open crown - and start on the road back to regaining the world number one ranking.
"I think tennis, the men's game, is at an absolute high right now, with a lot of exciting games being played, with a lot of respect," he said.
"Also, I think having had me and Rafa both make the career Grand Slam already at a young age I think is great for the game. We're obviously playing not only for ourselves and beating the other guys, but also for history. I think there's a lot at stake always in all our matches we play. I think it's wonderful."
"I always knew it was going to be an interesting match (on Sunday). I think we obviously have a huge amount of respect for each other. I admire his game. Today was another great match, I thought, with some fantastic rallies. I know it doesn't take anything away from his great season, because it was magnificent."