Under USCF rules, you don't have to keep score for Blitz and Quick chess (less than game in 30 minutes per side). Longer than that, yes, you have to keep score. Exceptions are for disabled players and young players who haven't learned how to keep score yet. (The TD can waive the requirements for these young players at his discretion.)
If you're required to keep score and you simply refuse to do it, the TD can penalize you by subtracting time from your clock, and if that doesn't work, he can forfeit you.
Hello chess.com. I have a legit question for you today. Is it required to write down notation in tournaments? Can you get disqualified if you don't writed own notation? I find it very annoying and distracting when playing because you have to worry about writing down the CORRECT move and if you accidently write down the wrong move then you get even more distracted.