That depends on what your credit score is before you file your bankruptcy case. If it is very high (over 700) then it will likely be lowered temporarily after you file for bankruptcy.
If your credit score is very low, then the score could actually increase after filing bankruptcy.
Either way, you can rebuild your credit after filing a bankruptcy case so that your credit score steadily improves over time.
Mark Markus has been practicing exclusively bankruptcy law in California since 1991. He is a Certified Specialist in Bankruptcy Law by the State Bar of California Board of Legal Specialization, AV-Rated by martindale.com, and A+ rated by the Better Business Bureau.