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One Lawyer for Both Spouses: Can One Draft Our Separation Agreement?

Getting along and thinking of sharing one lawyer? Learn what Ontario guidance says about independent review and an arrangement many couples use instead.

Family Law5 min readTSLBy the Treadstone Law Team · OntarioUpdated October 28, 2026
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Key takeaways
  • Ontario guidance says each spouse should have their own lawyer review a separation agreement, and that it is hard to change later.
  • A spousal support agreement should rest on full, honest financial disclosure, or a court can set it aside.
  • A separation agreement is not required for a divorce, and only a court can grant one.
  • A common arrangement is for one lawyer to draft and each spouse to get separate review, but whether one lawyer can act for both depends on the facts.

You and your spouse are separating on good terms. You agree on the big issues, and paying two lawyers to draft one document feels wasteful. It is natural to ask whether one lawyer can prepare the agreement for both of you.

The short answer is that it is more complicated than it looks. A lawyer owes duties to a client, and the two of you may want different things even if you feel aligned today. This article explains the issue, what Ontario guidance says about independent review, and the arrangement many cooperative couples use instead.

Why sharing a lawyer is a problem

A lawyer's job is to protect the interests of the person they act for. In a separation, your interests and your spouse's interests often pull in opposite directions: a dollar of spousal support one of you receives is a dollar the other pays, and a larger share of property for one is a smaller share for the other.

A lawyer who is asked to act for two people whose interests may conflict faces a real difficulty, because each person needs someone focused on their side. Whether one lawyer can act for both of you depends on the facts, so it is worth confirming with a lawyer before you rely on it.

If one lawyer acts for both of you, it is worth asking who is looking out for your position alone. Neither of you would have someone whose role is to say, for example, that you may be giving up more than you need to.

What Ontario guidance says about independent advice

Ontario.ca says separation agreements let spouses divide property as they choose, that each spouse should have their own lawyer review the agreement, and that it is hard to change later. The word to notice is review: the guidance points toward each person having their own advice before signing.

For support, the guidance says an agreement should be made with full, honest financial disclosure, without pressure, and with an understanding of its terms, or a court can set it aside. It recommends legal advice. If you do not understand what you are giving up, that is the kind of gap that can undermine the agreement later.

Changing a signed agreement is not simple. Only a court can change a support order or domestic contract, and the parties must negotiate a new contract and file it with the court using form 26B. Getting it right the first time is usually cheaper than fixing it.

The usual alternative: one drafts, each gets review

Many cooperative couples do not hire two lawyers to fight. Instead, they agree on terms between themselves or through mediation, and then use a lawyer's role in a limited way. The general pattern looks like this:

This keeps costs down while giving each of you someone who is on your side when you decide whether to sign. It also means any concern, such as a missing item or an unclear clause, is raised before the agreement is final.

What a good agreement depends on

Whatever route you choose, an agreement is only as strong as the information behind it. A financial statement is usually required if a family court case involves support, property or debts. Form 13 is for support-only cases and Form 13.1 is for cases involving property or debts, with or without support. These forms are a useful checklist even when you are not going to court.

TopicWhat to share before signing
IncomePersonal income tax returns; the Child Support Guidelines call for the three most recent years when someone applies for child support
Property and debtsEverything owned and owed at separation, and what was owned at marriage, since equalization depends on these figures
SupportDetails of children, roles during the relationship, health and ability to self-support, all of which affect spousal support

What to do next

Before you book anything, be clear with each other about what you are asking a lawyer to do. Then use this list:

Frequently asked questions

Can one lawyer act for both of us if we agree on everything?

Agreeing today does not remove the underlying conflict, because the terms affect each of you differently. Whether a lawyer may act for both depends on the facts, so ask the lawyer directly and have it confirmed. Ontario guidance still says each spouse should have their own lawyer review the agreement.

What if we cannot afford two lawyers?

A common approach is to reach terms through mediation or negotiation, have one lawyer draft, and then pay each spouse's own lawyer for a shorter review. That is usually less than full representation for both. Ask any lawyer about limited-scope options.

Do we need a separation agreement to get a divorce?

No. A separation agreement is not a step the Divorce Act requires, and only a court can grant a divorce. A separation agreement can let you divide property as you choose.

Can a separation agreement be set aside?

Ontario guidance says a support agreement made without full, honest disclosure, or under pressure, or without understanding its terms, can be set aside by a court. Independent advice and complete disclosure reduce that risk.

Sources

Links go to official government, court and regulator pages. The law changes — confirm you are reading the current version.

This article is general information, not legal advice. Reading it does not create a lawyer-client relationship. Ontario laws, tax rates, and government programs change, and how the law applies depends on your specific facts. For advice about your situation, speak with a licensed Ontario lawyer. Treadstone Law is licensed by the Law Society of Ontario — reach us at 1-844-900-1070 or start a file online.

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