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Ontario Family Law Guide | 2025

Separation Agreements Before Divorce
Why You Need One & How to Protect Yourself

Many couples sign a separation agreement before filing for divorce. This guide explains why, what's covered, how enforceability works, and the critical importance of independent legal advice.

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What's in this guide

  1. Why sign a separation agreement before divorce
  2. What a separation agreement covers
  3. Enforceability and legal requirements
  4. The critical role of independent legal advice
  5. Setting aside a separation agreement
  6. Frequently asked questions

1. Why Sign a Separation Agreement Before Divorce

In Ontario, you do not have to sign a separation agreement to get divorced. Divorce is a court process that legally ends the marriage. A separation agreement is a contract that governs what happens to property, support, and parenting during and after the separation.

Most couples sign a separation agreement before filing for divorce for several reasons:

A separation agreement is not the same as a divorce. You can be separated (living apart under a separation agreement) without being divorced. Many couples prefer this arrangement, especially if neither intends to remarry.

2. What a Separation Agreement Covers

A comprehensive separation agreement typically addresses:

3. Enforceability and Legal Requirements

A separation agreement is enforceable as a domestic contract under Ontario's Family Law Act if it:

A separation agreement signed without proper legal requirements is at risk of being set aside. This is one of the most common reasons agreements fail later. Do not skip these steps to save money. The cost of fixing a bad agreement is far greater.

4. The Critical Role of Independent Legal Advice

Each spouse must have the opportunity to obtain independent legal advice (ILA) from their own separate lawyer before signing. This does NOT mean the lawyers must negotiate the agreement. It means each lawyer must:

Both lawyers typically send the other a letter stating that their client has received independent legal advice. This letter is then attached to the separation agreement as evidence of ILA.

Absence of ILA is the single strongest ground for setting aside a separation agreement later. If you sign without a lawyer, you are exposing yourself to enormous risk. The small cost of legal advice now is nothing compared to the cost of litigation later.

5. Setting Aside a Separation Agreement

Despite best efforts, separation agreements can sometimes be set aside by a court. The grounds are:

If a separation agreement is set aside, the property division "unwinds" and both parties' rights are determined by court order instead.

6. Frequently Asked Questions

Do we both need separate lawyers?

Yes, absolutely. A single lawyer cannot provide independent legal advice to both spouses. It is a conflict of interest. Each party needs their own lawyer, even if you are in complete agreement and just want someone to review the terms.

What if we cannot afford separate lawyers?

The cost of legal advice now is far less than the cost of litigation later if the agreement falls apart. Many lawyers offer flat fees or fixed-fee services for separation agreements to keep costs manageable. Some offer payment plans. Do not skip this step to save money. It almost always costs more in the long run.

Can we use a mediator instead of lawyers?

Mediation can help you negotiate the terms of an agreement. However, mediation is not a substitute for independent legal advice. After mediation, each party should still obtain their own lawyer to review the proposed terms before signing.

What if my spouse disagrees with the terms?

If you cannot agree on terms, you have two options: (1) continue to negotiate with lawyers assisting, or (2) go to court and ask a judge to decide. Court is more expensive and slower than negotiated agreement, but sometimes it is necessary.

Can a separation agreement be changed later?

Yes, but only with difficulty. Once signed with proper legal advice and full financial disclosure, separation agreements are difficult to change except by written agreement of both parties or by court order upon showing a material change in circumstances. For parenting and support (which affect the children), courts can vary agreements more readily. For property division, variation is rare and requires evidence of fraud, non-disclosure, or unconscionability at the time of signing.

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