You can covert separate into community property and visa versa through a transmutation agreement. I cannot understand your final sentence.
The above is general legal and business analysis. It is not "legal advice" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts not reflected in the question. I am not your attorney until retained by a written retainer agreement signed by both of us. I am only licensed in California. See also avvo.com terms and conditions item 9, incorporated as if it was reprinted here.
It's not clear whether your question is about your wife's interest in the company or distributions to you based on the company's structure and agreements among the partners.
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In California, all assets and income derived or obtained or derived during the course of a marriage is considered "community property", of which your spouse has a 50% interest in. Unless there is an agreement in writing to the contrary, your wife has a 50% interest in the 25% interest of the business that you own with the three other partners.
The salary you are paid from the business is considered community property, so are the profits and losses from the business. Therefore, your wife has a 50% interest in the salary you are paid, and a 50% interest in the profits/losses from 25% of the business as a whole.
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