I agree with the previous answer - contributions after your date of separation should be your separate property. Usually, in order for your ex to receive a portion of your 401k a QDRO will need to be prepared. You can read more about QDROs for 401k plans at the link below.
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Your wife will have a percentage interest in your plan based upon the amount of time
from your marriage to your date of separation. The amount contributed after separation is separate property contributions. The division will be determined by California State order that must be in compliance with Federal Erisa standards.
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