.........And what happens if you lose with a zero rating??....?
Lowest rating

Chess.com needs to learn maths!
I'm guessing there are very few players so low but if two sandbagging friends played each other, shouldn't it be possible to have -8 and stay at 100 or 0 rating?

There's no limit on ECF ratings so they can get negative- and do- I've met a few people who got negative ratings!

J-Star-Roar wrote
There's no limit on ECF ratings so they can get negative- and do- I've met a few people who got negative ratings!
Now that's not normal.
100 is the lowest Live Chess rating. 0 is the lowest Online Chess rating