The best practice is to seek court approval.
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I would suggest you make sure that you have no hidden medical injuries that resulted from the accident. If you aren't sure, contact your local bar association to get referred to a local attorney to advise you.
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California is a no fault state. This means that the state is not interested in determining who is to blame for the irreconcilable differences. However, page 2 of FL100 does provide for reasons for your request for divorce.
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The short answer is no. The FL-150 I come and Expense form is only to be served on the other parties when required for disclosures. However, there are other instances where this form needs to be filed with the court. For example, when there is a Request for Order for support or attorneys fees.