I once asked a voice actor who's done both anime and American-made cartoons, and he said the figures are so far over the map, there's no real average. He used to be a musician and said it took a long time for him to build up enough of a resume that he could voice-act full-time. How much an actor makes depends on where and how often they work. A general rule of thumb is that companies who produce cartoons for the American market have significantly higher pay scales than companies who dub anime, but they are also harder to break into and usually require having an agent with connections. A very small number, less than 1%, are enough in-demand that they make six-figure incomes just from voice acting (he stressed that this is for actors who do little or no on-camera or stage work, and includes neither the "stars" who do voice work in feature films, nor the all-around actors like Ron Perlman and Clancy Brown, who do every kind of acting, and whose voice work is only a percentage of their total income). He wouldn't name names, but I think we can assume these are actors like Billy West, Jim Cummings, Tara Strong, Tom Kenny, etc. There is another small percentage, probably 5-10% who make comfortable, if not extravagant livings from voice work, due largely to their reputations and the body of work they've already done. The rest, even some of the best-known names in the business, simply don't have the connections or the venues to make big bucks, and usually have to supplement their incomes with commercial voiceovers, audio books, radio spots, dinner theater, and non-acting jobs.