What's the highest rating that you can get on chess.com?

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N/A

infinity would be the theoretical answer, although it is a useless answer. 

Since Hikaru has the highest blitz rating on chess.com (3200 ish) the practical answer would be about 3500, and that would assume you were able to beat Hikaru much of the time. 

Yeah but there is a guy that was rated in 19000+ in puzzles, so I guess is close to 20000?

I have seen players with a tactics rating of 18000

@ALYURFED

In Live Chess, you can't really go above 3600 unless you beat the hardest level of Kommodo consistently. The Elo system is like an integrating additions in rating that get progressively smaller as you become higher rated. There will be a point (I contend possibly 3700) where rating additions are negligible. Because as your rating goes up, the opponents' rating go down. Both'll  change by nearly zero at some point, mathematically speaking

I agree; infinity sounds like the theoretical answer, but engines are usually no more than about 3500. For the op, I think they are talking game rating and not tactics rating like others have said. Tactics ratings of many thousand like 18000+ is just inflated silliness from strong tactics players who memorize the tactics puzzle answers from the highest rated tactics and repeat to gain lots of points; they are not really this strong tactically. 

Another consideration for game rating is that although infinity sounds like the theoretical answer, this may not be possible because of the nature of the rating system. Everyone remember how grandmasters playing members several hundred points lower rated do not gain any rating points from wins? That is because you don't gain rating if the ratings are not close enough (because the higher player is expected to win really often).

The same principle applies to infinity; this may not be feasible because the strongest opponents (engine or super GM) are only sub-3500 so even if someone (or engine) were way stronger, then they wouldn't gain rating points upon winning. If 3500 is the highest rated player/engine (estimating), then anything say 4000 may not be mathematically possible. The only way to reach higher rating than this would be if you could consistently win against opponent(s) really high rated as well and since they don't exist to this level, infinity is only a theoretical point.

Yes. Typing about same response at about the same time; of course, your answer is nice and concise compared to mine

the tactics ratings are artificial anyway. They are not based upon results against other players. they are just "for fun". Playing against other human players one on one somewhere around 3400-3500 is likely the absolute upper limit. 

Your response was a good read too

There is no limit theoretically, however that is not really a practical reply.

The answer depends on how good everyone else is. If you are 500 points higher elo than the 2nd best player, then you would still get no point for beating the 2nd best player. So your elo would never move forward and would be stuck till others caught up.

as high rating that you get 0 points for winning

someone was 4000 at one point

Infinity

Chess is a moral game. if you like your life(job,...)you will improve easily but if not you can recession easily

there is people who are 65k in puzzles check the leaderboard

Infinite