Can a C100 Form Be Rejected? Common Reasons & How to Avoid Them

Can a C100 Form Be Rejected?

Key Highlights:

• Yes, a C100 form can be rejected if it’s incomplete, incorrectly filled out, or submitted without proof of MIAM attendance
• Common reasons include using the wrong form version, missing signatures, incomplete sections, or failing to attach the MIAM certificate
• Courts typically return rejected forms with guidance on what needs correcting
• You’ll need to fix the issues and resubmit, which can delay your application by several weeks
• Getting help with your application can prevent rejection and speed up the process

Understanding C100 Form Rejections

Can a C100 form be rejected? Yes, absolutely. Courts reject C100 applications more often than many parents realise. If you’re planning to apply for a child arrangements order, it’s worth knowing what can go wrong before you submit your paperwork.

The good news? Most rejections happen for straightforward reasons that are easy to avoid.

Common Reasons Your C100 Application Might Be Rejected

1. You’ve Used the Wrong Form or Version

The C100 form gets updated periodically. Using an outdated version is one of the quickest ways to have your application sent back. Always download the latest version before you start filling it in.

2. Missing or Invalid MIAM Certificate

This is the most common reason for C100 form rejection. Before applying to court, you must attend a Mediation Information and Assessment Meeting (MIAM) in most cases. You’ll need to include your MIAM certificate with your application.

Without this certificate, the court will reject your form immediately. There are exemptions to the MIAM requirement, such as cases involving domestic abuse or urgency, but you must clearly indicate which exemption applies and provide supporting evidence.

Jess Knauf, Director of Client Strategy at Mediate UK, notes: “We often see parents who’ve rushed to court without attending their MIAM. This just delays everything. Even if you don’t think mediation will work, attending the MIAM is usually required before the court will accept your application.”

3. Incomplete Information or Missing Sections

Courts need complete information to process your application. Missing details on a C100 form commonly include:

• Child’s full name and date of birth
• Complete addresses for all parties
• Details of the other parent or person with parental responsibility
• Your relationship to the child
• What orders you’re asking for and why

Even one blank mandatory field can result in rejection.

4. Missing Signatures and Declarations

You must sign the statement of truth on your C100 application. This confirms that the information you’ve provided is accurate to the best of your knowledge. An unsigned form will be returned.

5. Incorrect Court Fee or Payment Issues

The C100 application currently (2025) costs £270, though you may be eligible for fee exemption or remission. If you don’t include payment or fee exemption evidence (form EX160), your application won’t be processed.

What Happens When Your C100 Form Is Rejected?

When a court rejects your application, they’ll return it to you with a letter explaining what’s wrong. You’ll need to:

1. Correct the identified issues
2. Resubmit the form
3. Wait for processing again (usually 2-3 weeks)

This delay can be frustrating, especially when you’re worried about arrangements for your children.

Real-World Example

We worked with a couple where the father had completed his C100 but forgotten to attach his MIAM certificate. He’d attended the MIAM and had the certificate at home, but simply didn’t include it in the envelope.

His application was returned, which added three weeks to an already stressful situation. Once he resubmitted with all the correct documents, the application was accepted within days.

How to Prevent Your C100 Being Rejected

Check everything twice before posting your application:

• Use the current form version
• Include your MIAM certificate (or evidence of exemption)
• Complete every mandatory field
• Sign the statement of truth
• Include the correct fee or exemption evidence
• Make copies of everything for your records

Can Mediation Help Avoid Court Entirely?

Many parents don’t realise that resolving issues through mediation can be quicker and less stressful than court. At Mediate UK, we help parents reach agreements about child arrangements without needing to complete a C100 at all.

Even if you do need to go to court eventually, attending mediation strengthens your application. It shows you’ve tried to resolve matters cooperatively.

Frequently Asked Questions

How long does it take for a C100 to be processed? Once accepted, courts typically process C100 applications within 2-3 weeks. Your first hearing will usually be scheduled 4-6 weeks after submission.

Can I resubmit a rejected C100 form? Yes. Fix the issues identified by the court and resubmit. You won’t need to pay the fee again if it was rejected for administrative reasons.

What if I disagree with the rejection? If you believe your form was wrongly rejected, contact the court in writing to explain why you think it should be accepted. However, most rejections are for clear procedural reasons.

Do I need a solicitor to complete a C100? No, but getting advice can be helpful. Many parents complete the form themselves successfully when they understand the requirements.

Getting Help With Your C100 Application

If you’re worried about whether your C100 might be rejected, getting support can save time and stress. At Mediate UK, we can help you understand the process, ensure your MIAM is completed correctly, and explore whether mediation could resolve your situation without court involvement.

Ready to discuss your options? Contact Mediate UK today on 0330 999 0959 or book a free 15 minute consultation with us. Our experienced team can guide you through the process and help you make the right decisions for your family.