If you are a senior senior that still needs to take the ­SAT or re-take it, the deadline for the November test date is 10/27.

If you are going to do it in December, the deadline is November 5th.
College Board Link below for registration:
collegereadiness.collegeboard.org/sat/register/dates-deadlines
Test Date: November 7, 2020
Late Registration: October 27, 2020 (for registrations made online or by phone)
Test Date: December 5, 2020
Registration Deadline: November 5, 2020
Late Registration: November 24, 2020 (for registrations made online or by phone)