Typically zero in Reading and Writing and zero or one in Math, depending on the specific form's curve. Math has fewer questions, 44 against 54, so a single miss sometimes still scales to 800 while in Reading and Writing it usually does not.
The asymmetry between sections is worth planning around. Math sometimes tolerates a single miss because there are fewer questions to scale across, whereas Reading and Writing usually does not. If you are chasing 1600, Reading and Writing accuracy is the tighter constraint.
The full picture, with the surrounding detail, is in How Many Questions Can You Miss for a 1500 SAT?.