How does Santa fund his operation? He has a staff of thousands (if not tens of thousands) of elves for which he has to provide substance and lodging, he produces billions of toys a year which he has to obtain the base materials for and then store somewhere, and he has to generate enough energy to travel at near light speed for one night a year to deliver all those toys.
Anyway, these are the types of questions that lead to a comic like today's. Assuming Santa is telling the truth, and we have no reason to doubt him, his only income appears to be the milk and cookies he receives at Christmas. Making tithing settlement in the North Pole First Ward an awkward event.