Child support is one of those areas where the rules are clear on paper and messy in practice. California uses a statewide formula to calculate support, and the courts apply it pretty consistently, but the paperwork that goes into getting an order signed is where most cases get tripped up. People assume the hardest part is the calculation. The hardest part is actually filling out the forms correctly, attaching the right documents, and filing in a way that the court accepts on the first try. The mistakes people make are predictable, and most of them are avoidable once you know what to look for.
Filing the Wrong Type of Case
The first place people get into trouble is picking the wrong case type. Child support comes up in several different contexts in California, and each one has its own procedural path. A divorce with minor children handles support as part of the divorce case. Unmarried parents typically have to establish parentage first through a paternity case before support can be ordered. Parents already covered by an existing order who want changes file a request for order to modify, not a new petition.
Filing the wrong type of case wastes time and money. A new support petition filed in a case that already has an order gets rejected. A standalone support filing between unmarried parents who have not established legal parentage gets stuck. The fix is figuring out the correct case type before any paperwork goes to the clerk.
Mixing Up Court Procedures
Another version of this mistake is filing in the wrong court entirely. California Department of Child Support Services, known as DCSS, handles many support cases through its own administrative process. People sometimes file private court paperwork while DCSS already has the case, or try to handle things through DCSS when their case is in private court. The two tracks have different rules and different forms.
Incomplete or Inaccurate Income & Expense Declarations
The income and expense declaration, form FL-150, is the heart of any child support case. Courts will not issue an order without it, and the numbers on it drive the support calculation. This is also the form where most mistakes happen.
The most common errors are leaving sections blank, rounding numbers in ways that do not match supporting documents, and forgetting to include all sources of income. Gross income on the FL-150 should match what shows on pay stubs and tax returns. If the numbers do not line up, the court notices, and the other side will absolutely notice.
Forgetting Non-Wage Income
Income for child support purposes is broader than just a paycheck. It includes self-employment income, rental income, investment income, bonuses, commissions, tips, military allowances, disability payments, unemployment, and many other sources. People who are W-2 employees sometimes assume only their salary counts. People who are self-employed sometimes leave off business income or report only net rather than addressing the deductions separately. Either approach causes problems when the court calculates support.
Inaccurate Expense Reporting
The expense side of the FL-150 matters less for the support calculation, since the guideline formula is mostly income driven, but inaccurate expense information can affect deviation arguments, hardship findings, and spousal support calculations. Padding expenses to look poor or leaving them blank to look like you have no costs both backfire.
Missing or Incomplete Supporting Documentation
Forms by themselves are not enough. Courts want documentation that supports the numbers on the forms. Pay stubs for at least the last two or three months, the most recent W-2 or 1099, tax returns for the past two years, and records of self-employment income and expenses are standard. Self-employed parents and parents with variable income need to provide more documentation than salaried employees because the court has to figure out an actual income figure rather than relying on a single pay stub.
People often submit the form without attachments, or submit incomplete attachments that do not cover the relevant time period. The court may issue the order anyway based on incomplete information, which often produces a support amount that does not reflect reality. Fixing it later requires filing a modification.
Health Insurance & Childcare Costs
Two specific expense categories matter for the support calculation. Health insurance premiums for the children get added to or factored into the support amount, and so do work-related childcare costs. Both need to be documented. The amount paid, who pays it, and what portion is attributable to the children all matter. Vague claims like “I pay for the kids’ insurance” without documentation get discounted by the court.
Service of Process Errors
Once the paperwork is filed, the other parent has to be served. California has specific rules about how service must happen, who can do it, and what proof must be filed. Service of process is one of the most common places where cases get stalled.
Service has to be done by someone who is over 18 and not a party to the case. The petitioner cannot serve the respondent personally. Service has to happen within specific timeframes before the hearing. Proof of service has to be filed with the court using the correct form. Missing any of these requirements means the hearing gets continued or the case gets dismissed.
Skipping Service Entirely
A surprising number of people file paperwork without ever serving the other parent. They assume that filing is enough, or that the court will notify the other parent. Neither is true. Until the other parent is properly served, the case cannot move forward, and the court cannot issue an enforceable order.
Using Outdated Forms
California court forms get updated periodically. The Judicial Council revises them when laws change or procedures are updated. People who pull forms from old websites or use outdated templates end up filing forms the court will not accept. The rejection slip from the clerk usually says something like “current revision required,” and the filer has to start over with the correct version.
Always pull forms from the official California Courts website or from a current source. Forms older than a year or two should be checked against the current version before filing.
Wage Garnishment & Earnings Assignment Issues
California requires an earnings assignment for child support in most cases. This is the legal mechanism that has the support amount withheld directly from the paying parent’s paycheck. The form, FL-195, has to be prepared along with the support order and served on the employer.
People sometimes skip the earnings assignment, assume the other parent will pay voluntarily, and end up with collection problems later. Even when the parents agree the paying parent will send checks directly, California law generally requires the earnings assignment unless both parents and the court agree to a different arrangement.
Self-Employed Payors
Self-employed parents do not have employers to send the earnings assignment to. This means alternative collection mechanisms have to be addressed at the time the order is entered. Cases involving self-employed payors that do not address collection upfront often end up in enforcement actions later.
Not Following Through on Final Orders
The last common mistake is procedural. A hearing happens, the judge announces a ruling, and the parties leave thinking the case is done. It is not. Someone has to prepare the actual written order based on the ruling, submit it to the judge for signature, and serve it on the other party. Without the signed written order, there is nothing enforceable. The verbal ruling at the hearing is not the order.
People sometimes assume the court will prepare the order. Courts almost never do this. The parties, or someone helping them, have to prepare the order and submit it. Cases drag on for months because no one ever finalized the paperwork after the hearing.
How to Avoid These Mistakes
Most of these errors come from one of two sources. Either the person filing does not know what the court requires, or they know but are working too fast to catch their own mistakes. Both problems are addressable.
Working with someone who handles child support paperwork mistakes regularly catches issues before they become rejections. Registered Legal Document Assistants, often called LDAs, prepare these documents for self-represented parties based on the parties’ instructions. LDAs are not attorneys and cannot give legal advice, but they know which forms are required, what the court will reject, and how to put a filing together that actually moves through the system.
For people preparing their own paperwork, the practical advice is to slow down, double check every form against the most current version, make sure every supporting document is attached, and verify that service is done correctly. A small amount of upfront care prevents weeks of delay later.
