Planning on not showing up to SAT

I plan on not showing up to my SAT test after getting back my ACT (and thinking I’ve basically reached my score ceiling). Is there a way or reason to alert college board beforehand, or do I just not show up? (I also don’t want the school center waiting for me. was in a room that went 20 minutes late waiting for a kid to show, and don’t want to be that disrespectful of people’s time.)

Just don’t show up. You paid. That’s all they care about.

For the June test, I phoned the CollegeBoard to tell them D16 wouldn’t be there and would take the test at a later date. They didn’t want to hear it. Told me to call back AFTER the test to change the date.