The actor told the Waikato Times that he has begun discussing the November 2013 celebration with showrunner Moffat.
"He was pitching the 50th anniversary at the end of this series and what everything was going to be about and it was... very exciting," said Smith. "No doubt he'll come up with something brilliant because that's the sort of man he is.
"I hope that we mark it in the best way possible and we honour the people that have been in the show before us and we make it as grand and brilliant and inventive and as much an occasion as possible. What [he's planning], I may have an idea, but I can't tell you, I'm afraid."
The 29-year-old refused to confirm or deny speculation surrounding a possible special episode reuniting multiple Doctors.
"Who knows?" he said. "I think it's an exciting idea. Whether it would be possible, or whether it could ever happen I just don't know, but whatever we can do to mark that 50th anniversary will be spectacular, that much I do know.
"Nothing's set in stone. I imagine there will be a script knocking around [for the 50th special] about Christmas [time] and there we will develop further and shoot it next spring."
Smith also spoke out to dismiss tabloid rumours that he will quit Doctor Who in the near future.
"Everyone leaves eventually [but] no, I'm not leaving any time soon," he insisted. "I am coming back for the 50th anniversary. To suggest I am quitting now is wrong."
Doctor Who continues this Saturday on BBC One and BBC America.
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Watch a trailer for the next Doctor Who episode below: