Ontario Custody Forms: Essential Documents for Your Case

Debra Jul 07, 2026

Navigating child custody laws in Ontario can be complex, but understanding the necessary forms is a crucial first step. This guide will walk you through the essential documents you'll need to file for custody in Ontario, ensuring you're well-prepared for your journey through the family court system.

WS Custody Court Divider Pages.pdf | Powered by Box
WS Custody Court Divider Pages.pdf | Powered by Box

Before we delve into the specific forms, it's important to note that the court's primary concern is the best interests of the child. This principle guides all decisions regarding custody, access, and parenting plans. With this in mind, let's explore the key forms you'll need to file for custody in Ontario.

a table with a bunch of different colored papers on top of it and a keyboard in the background
a table with a bunch of different colored papers on top of it and a keyboard in the background

Initial Custody Application

The process begins with filing a custody application. This form initiates the court process and outlines your request for custody arrangements.

Child Custody Agreement, Co-Parenting, Joint Custody, Legal Custody, Physical Custody, Parenting Plan, Child Support, Communication Plan
Child Custody Agreement, Co-Parenting, Joint Custody, Legal Custody, Physical Custody, Parenting Plan, Child Support, Communication Plan

In Ontario, the primary form used for this purpose is the Application (Form 8A). This form is comprehensive, requiring detailed information about both parties, the children involved, and the specific custody arrangements you're seeking. It's crucial to fill out this form accurately and completely to ensure a smooth start to your case.

Form 8A: Application

an image of a list with the names and dates for different locations to go on it
an image of a list with the names and dates for different locations to go on it

Form 8A is a 14-page document that covers various aspects of your custody application. Here's a breakdown of the sections you'll need to complete:

  • Part A - Applicant Information: This section requires details about you, the applicant, including your name, address, and contact information.
  • Part B - Respondent Information: Provide information about the other parent, the respondent, in this section.
  • Part C - Children: List all children under the age of 18 who are the subject of the application. Include their full names, dates of birth, and current addresses.
  • Part D - Marital Status: Answer questions about your marital status and the length of your relationship with the respondent.
  • Part E - Custody Arrangements: This is the heart of the application. Here, you'll outline the specific custody arrangements you're seeking, including parenting schedules, decision-making responsibilities, and any other relevant details.

Form 35.1: Affidavit

Types of Custody: Full, Sole, Primary, Joint & More
Types of Custody: Full, Sole, Primary, Joint & More

After completing Form 8A, you'll need to swear an affidavit (Form 35.1) to confirm that the information you've provided is true. This form is a sworn statement that accompanies your application, providing additional details and evidence to support your custody request.

In your affidavit, you can include details about your relationship with your children, your ability to provide for their needs, and any relevant history that supports your custody application. It's essential to be honest and thorough in your affidavit, as it plays a significant role in the court's decision-making process.

Additional Forms and Documents

a sample rental agreement form is shown in this image, it shows the room for rent and
a sample rental agreement form is shown in this image, it shows the room for rent and

Depending on your specific circumstances, you may need to file additional forms and documents to support your custody application. Some common examples include:

Financial Statements

Child’s Best Interest In Custody
Child’s Best Interest In Custody
Child Custody Binder,custody Planner Printable,coparenting Calendar, Single Parent Organizer,child Support Tracker,custody Battle Journal A4 - Etsy
Child Custody Binder,custody Planner Printable,coparenting Calendar, Single Parent Organizer,child Support Tracker,custody Battle Journal A4 - Etsy
Printable Custody Documentation Template
Printable Custody Documentation Template
What Can Be Used Against You In A Custody Battle | Expert Guide
What Can Be Used Against You In A Custody Battle | Expert Guide
Custody Log Template, Custody Binder, Child Custody Documentation, Child Custody Binder, Custody Binder For Court, Parenting Plan Custody, Child Custody Battle, Parallel Parenting, Law School Life
Custody Log Template, Custody Binder, Child Custody Documentation, Child Custody Binder, Custody Binder For Court, Parenting Plan Custody, Child Custody Battle, Parallel Parenting, Law School Life
Child Custody  Journal
Child Custody Journal
Parenting Plan Custody Agreement Template
Parenting Plan Custody Agreement Template
How to Improve Your Chances in Winning Child Custody Cases
How to Improve Your Chances in Winning Child Custody Cases
Types of Custody Schedules That Put Kids First
Types of Custody Schedules That Put Kids First
Child Custody Agreement, Customizable Co-parenting Form Template, Printable 50/50 Joint Custody Agreement, Instant Digital Download, Canva - Etsy
Child Custody Agreement, Customizable Co-parenting Form Template, Printable 50/50 Joint Custody Agreement, Instant Digital Download, Canva - Etsy
Changing a Custody Order
Changing a Custody Order
Child Custody Documentation
Child Custody Documentation
Child Custody Agreement, Printable Co-Parenting Form Template, Editable 50/50 Joint Custody Agreement Instant Digital Download
Child Custody Agreement, Printable Co-Parenting Form Template, Editable 50/50 Joint Custody Agreement Instant Digital Download
50/50 Custody Schedules
50/50 Custody Schedules
Custody Case tip- writing declarations
Custody Case tip- writing declarations
Everything You Need To Know AboutChild Custody Evaluations
Everything You Need To Know AboutChild Custody Evaluations
Filing Emergency Custody or Protection Orders
Filing Emergency Custody or Protection Orders
Co-Parenting Custody Log for Single Parents - Printable Court Journal | Communication Tracker | Incident Log | Custody Exchange Notes
Co-Parenting Custody Log for Single Parents - Printable Court Journal | Communication Tracker | Incident Log | Custody Exchange Notes
Note-Keeping for Child Custody
Note-Keeping for Child Custody
Simple Child Custody Agreement, One Page 50/50 Joint Custody Agreement Form Canva, Printable & Editable Co-Parenting, Instant Download
Simple Child Custody Agreement, One Page 50/50 Joint Custody Agreement Form Canva, Printable & Editable Co-Parenting, Instant Download

If you and the other parent have significant property or income, you may need to file a Financial Statement (Form 13.1) to provide the court with a clear picture of your financial situation. This form helps the court make informed decisions about child support and property division.

Consent Trifold

If you and the other parent agree on the custody arrangements, you can file a Consent Trifold (Forms 25, 26, and 27) to formalize your agreement. This package includes forms for both parents to complete, outlining the agreed-upon custody, access, and support arrangements.

Filing for custody in Ontario involves several steps and forms, but understanding the process and the required documents can help alleviate some of the stress. By familiarizing yourself with the necessary forms and seeking professional guidance when needed, you can navigate the family court system with confidence. As you embark on this journey, remember that the court's primary concern is the best interests of your children, and working towards a custody arrangement that prioritizes their well-being is crucial.