Speaking at the Edinburgh International Television Festival, Moffat admitted that he would never turn down "more money" but insisted that the sci-fi drama's current budget is ample.
"The schedule and the pressure of trying to do Doctor Who on any budget - including Avatar's - is horrific," he said. "I am never, ever going to say I've got enough [money] - that's like asking, 'Would you like to be more happy?'"
However, he clarified: "Doctor Who is incredibly well looked after by the BBC - they are incredibly aware of its crown jewel status, that it's not merely a show that's successful now.
"I truly believe it could be a show that outlives everybody in this room. It could carry on that long, so it doesn't just make money now - it'll make money forever."
Moffat concluded by maintaining that he has "no complaints" about the amount of money allocated to Doctor Who.
"Of course I'd like more money, [just as I'd like] to be happier, thinner and more handsome!" he quipped.
Doctor Who returns to BBC One and BBC America on Saturday, September 1.