Common-Law vs. Married: How Your Legal Rights Differ in Ontario

You've been together for years. You share a home, finances, maybe children. It feels like a marriage — and in many ways it is. But when it comes to your legal rights in Ontario, the distinction between common-law vs. married matters enormously, and the gap is wider than most couples realize.

Ontario does not recognize "common-law marriage" as a legal status equivalent to marriage. Living together — even for many years — does not automatically give you the same rights as a legally married spouse. Some protections exist for common-law partners, but many do not. Knowing where you stand before a crisis hits is the most practical thing you can do for yourself and your family.

Here is a plain-language comparison across the areas that matter most.

1. Property Division

This is where the difference is sharpest.

Married spouses are covered by Ontario's equalization regime under the Family Law Act. Each spouse calculates the net growth in their property during the marriage. The spouse whose property grew more pays the other half the difference — regardless of whose name is on title. The goal is to share the economic gains of the partnership.

Common-law partners get no automatic equalization. When the relationship ends, each person keeps what is in their name. If your partner bought the house and put it in their name only, you have no automatic claim to it — even if you contributed money, labour, or years of domestic support.

A common-law partner who has been shortchanged may pursue an unjust enrichment or constructive trust claim in court, but this requires proving a contribution and a corresponding benefit — litigation that is uncertain, expensive, and slow. A cohabitation agreement made in advance is far cleaner.

2. The Matrimonial Home

Married spouses have special statutory rights to the home they lived in as a family — the matrimonial home. Both spouses have an equal right to possess it during the marriage, and neither can sell, mortgage, or transfer it without the other's written consent, even if only one spouse is on title.

Common-law partners have no equivalent protection. If your partner owns the home and the relationship ends, they can ask you to leave. They can sell or refinance without your consent. You have no automatic right to stay.

3. Spousal Support

Both married and common-law partners can claim spousal support after separation — this is one area where the law treats them more similarly.

Married spouses can claim support after any marriage that ends in separation or divorce. There is no minimum duration required, though the length of the marriage affects the amount and duration of support.

Common-law partners can also claim support, but as of writing — verify current rules — a qualifying relationship generally requires three years of cohabitation, or a shorter period if you have a child together. Support principles (amount and duration) follow the same guidelines once the threshold is met.

4. Inheritance and Intestacy

This is one of the starkest gaps.

Married spouses are protected heirs under Ontario's intestacy rules. If your spouse dies without a will, you receive a preferential share of the estate before other relatives receive anything.

Common-law partners receive nothing under Ontario's intestacy rules. If your partner dies without a will, their estate passes to their children, parents, or other relatives — not to you. You could lose access to the home you shared, money you both saved, and possessions you thought of as yours.

5. Pensions and Benefits

Married spouses generally have strong default entitlements: Canada Pension Plan (CPP) survivor benefits, pension division rights under many workplace plans, and automatic beneficiary status under certain group insurance policies.

Common-law partners can access many of the same benefits — CPP survivor benefits and some pension plans do recognize qualifying common-law relationships — but the definitions, waiting periods, and documentation requirements vary by plan and program. Default entitlements are less reliable, and gaps are more common.

Always name your partner explicitly as beneficiary on RRSPs, life insurance, and pension plans — do not rely on defaults.

6. Parenting: Where the Rules Are the Same

Parenting rights do not depend on whether you were married. Decision-making responsibility (formerly called custody) and parenting time (formerly called access) are determined by the best interests of the child — full stop. A child born to a common-law couple has the same legal relationship with both parents as a child born to a married couple.

7. Estate Administration

If a married person dies, their spouse has a strong claim to act as estate trustee (executor) and will generally be the first in line if there is no will.

If a common-law partner dies without a will, their partner has no automatic right to administer the estate. A relative — potentially a hostile one — could apply first. This creates serious practical problems for the surviving partner even before the inheritance gap is addressed.

The Single Most Important Takeaway

"Common-law" is not "common-law marriage." It does not grant equivalent rights. The gaps are real, they arise at the worst possible moments — death, separation, illness — and they are entirely preventable with the right documents in place.

Two documents fix most of this:

• A cohabitation agreement that defines how property is owned, how it divides on separation, and what support obligations exist.
• A will and powers of attorney that ensure your partner inherits, can act for you if you are incapacitated, and can administer your estate.

These are not pessimistic documents. They are practical ones — the kind that protect what you have built together.

Frequently asked questions