How does the math work for the reduction in ratings at the start of each new ranked season?

[ztaknadroj_PSN]

I'm at 598 right now and am mainly curious if making it to 600 would make a difference in where I start for next season because it'd be in Wild Card instead of Pennant Race.

Appreciate the info!

[johndarlas_PSN]

You'll start out at 400 when the new season starts.