I live in CA and have been working for a company for almost 2 years. My work is often based on "billable hours." I haven't been billable for a few months due to reasons out of my control, however I recently played a crucial role in landing a multi-million dollar account (larger than anything they have ever won). Shortly after we were awarded the business, I was notified that they are reducing my salary by 20% because I'm not currently billable (but will be, within two weeks). I have also never received any negative feedback. I am a female, and there is only one other person at my role/salary/situation (male). To my knowledge I have contributed much more to the company's revenue than my counterpart (and they are not reducing his salary). Is this legal?