Common law in Ontario isn’t a single timeline; it changes depending on the context. In Ontario and across Canada, the point at which you’re treated as “common-law” can differ for family law, taxes (CRA marital status), immigration sponsorship, and wills and inheritance.
At RPB Family Law, we keep this practical. We help you identify which system applies, what “common-law partner” or “spouse” means in that setting, and what may change for legal rights, spousal support, child support, property rights, and assets, especially when you’re planning or navigating a separation.
This article is general legal information, not legal advice for your specific circumstances. If you want help applying these rules to your relationship status, separation planning, or a domestic contract, contact our family lawyers for assistance.
The Three Common Law Timelines in Ontario
Most people hear “common law marriage” and assume the rules are universal. In Ontario (and Canada generally), the timeline depends on the context:
- Family law (spousal support in Ontario): You may be treated as “spouses” for spousal support payments if you have cohabited continuously for 3 years, or if you are in a conjugal relationship “of some permanence” and are parents of a child.
- Taxes (Canadian Revenue Agency): You are “living common-law” for tax filing status if you live together in a conjugal relationship for 12 continuous months (with limited short separations), or you share a child/custody arrangement that meets CRA conditions.
- Immigration (Immigration sponsorship): A “common-law partner” is generally someone who has cohabited in a conjugal relationship for at least one year under the federal immigration definition.
What Common Law Actually Means in Ontario
Cohabitation and Conjugal Relationship
Most systems don’t just look at a calendar. They look at whether you are cohabiting in a conjugal relationship (often described as “marriage-like”).
For example:
- CRA uses “living common-law” when you live with a partner in a conjugal relationship and meet time/child conditions
- Immigration uses “cohabiting… in a conjugal relationship” for at least one year.
In real life, “conjugal relationship” can involve factors like shared home, shared expenses, and presenting socially as a couple, especially when you must prove relationship status for an application, benefits, or a court dispute.
Common-Law Relationships vs Married Couples
A marriage certificate creates married spouses. Common law partners generally do not become married spouses just by living together (even for many years). That’s why “common law marriage” is often a misleading phrase in Ontario family law conversations.
And it matters because divorce process rules apply to marriage: only married spouses can get a divorce under the federal Divorce Act.
What is a Common-Law Spouse Entitled to in Ontario?
When Are You Considered Common-Law in Ontario for Family Law?
Here’s the Ontario-specific core:
Spousal Support Timeline (Family Law Act)
For spousal support in Ontario, the Family Law Act extends the meaning of “spouse” beyond married couples. It includes people who are not married and have cohabited:
- continuously for 3 years, or
- in a relationship of some permanence if they are parents of a child.
That’s why you’ll often hear: “3 years makes you common-law in Ontario.” It’s not completely wrong, but it’s incomplete. It’s mainly a support timeline, not a universal “common law” clock.
When Are You Common-Law for Taxes in Canada?
CRA Common Law Timeline
For the Canadian Revenue Agency, you’re “living common-law” if you live with a partner in a conjugal relationship and at least one condition applies, including:
- living together 12 continuous months (with certain separations under 90 days still counted), or
- being the parent of a child, or
- certain custody/control situations.
This matters for tax law, your tax filing status, and eligibility calculations for programs tied to household income.
Common-law status and government benefits
Depending on the program rules, common-law recognition can affect or interact with:
- Canada Child Benefits, GST/HST credit, and other income-tested benefits
- Benefit plans that ask for your relationship status (for example: health benefits, employee benefit plans, or survivor benefits)
- Situations involving Old Age Security, disability benefits, or social assistance (each has its own rules; always verify with the program and get tailored advice)
When Are You Common-Law for Immigration Sponsorship?
In Canadian immigration law, “common-law partner” is defined as someone cohabiting in a conjugal relationship for at least one year.
That’s why immigration conversations often focus on:
- “Have you lived together continuously for 12 months?”
- “Can you document cohabitation?” (leases, joint bills, mail, etc.)
Do Common Law Partners Get Property Division in Ontario?
Ontario’s equalization of net family property system is built around marriage. In plain language: if you are married spouses, you generally calculate Net family property and the higher-NFP spouse may owe an equalization payment.
However, Ontario materials and legal education resources emphasize that Part I (family property equalization) applies to married spouses, and common-law couples typically do not get equalization just by time together.
What Common Law Partners Can Do About Property Acquired During Cohabitation
Common law partners may still have options, but the strategy is different:
- Domestic contract planning: a cohabitation agreement can set rules for property rights, property division, support, principal residence arrangements, and how you’ll handle assets if you separate.
- Litigation claims (fact-specific): you may see arguments like unjust enrichment, a constructive trust, or an unjust enrichment claim tied to contributions to an asset (for example, an interest in property).
Financial Disclosure and “what’s really owned”
Whether you’re negotiating a separation agreement or litigating in court, disputes often hinge on:
- accurate Financial Disclosure
- tracing assets, debts, and what was property acquired during the relationship
- whether money was commingled (including tax-relevant items like the principal residence exemption and ownership history)
If you’re planning to separate, get advice early; these facts shape the entire legal outcome.
Talk to a Lawyer About Your Situation
Common-Law Partners, Wills, and Inheritance in Ontario
Common-law partners should not assume they have the same estate rights as married spouses. In Ontario, a common-law partner generally does not automatically inherit on an intestacy if there is no valid will. Depending on the facts, a surviving partner may have other possible claims, such as dependant support, unjust enrichment, or trust-based claims. This is why wills and powers of attorney are especially important for common-law partners.
How We Recommend Protecting Yourself in a Common-Law Relationship
Use Contracts Intentionally
If you’re cohabiting (or thinking about it), consider:
- a cohabitation agreement (a type of domestic contract)
- A marriage contract, if you plan to marry later and want clarity
- updated wills and Power of Attorney documents (estate planning is not “later”; it’s risk management)
If You’re Separating, Don’t Delay the Fundamentals
A strong separation plan usually includes:
- clear parenting terms (decision-making responsibility, parenting time)
- child support and spousal support analysis (facts + guidelines + budgets)
- clean Financial Disclosure and asset mapping (banking, debts, property, vehicles, pensions, benefits)
- a separation agreement drafted to be enforceable and practical
Separation in Ontario: Step-by-Step Guide of the Legal Process
Talk to an Ontario Family Lawyer About Your Relationship Status
At RPB Family Law, we help people across Ontario make sense of common-law relationships without panic or myths; whether you’re planning (cohabitation agreement, wills) or navigating separation, support, parenting, and property disputes.
Book a confidential consultation with our team, and we’ll help you understand where you stand, what steps make sense next, and how to protect your rights and your future with a clear, practical plan.
Common Law in Ontario | FAQs
How long do you have to live together to be common-law in Ontario?
It depends on the context. For Ontario family law (spousal support), it’s often 3 years of continuous cohabitation, or a relationship of some permanence if you have a child. For taxes and immigration, the timeline is commonly 12 months.
Is “common law marriage” a real thing in Ontario?
Not in the same way people mean it. Living together does not create “married spouses.” Marriage requires a legal marriage process and a marriage certificate. “Common-law” is a status used differently across family law, taxes, and immigration rules.
Can common-law partners get a divorce in Ontario?
No. Divorce is a legal process under federal law for married spouses. If you were never legally married, you don’t get a divorce. However, you may still need to resolve support, parenting, and property issues after separation.
Do common-law partners get property division (equalization) in Ontario?
Usually not. Ontario’s equalization of the net family property system is designed for married spouses. Common-law partners typically do not get automatic equalization just from living together, even for many years. Different legal claims or agreements may apply.
Does being common-law affect government benefits in Canada?
It can. Common-law status may change income-tested benefits and credits, such as the Canada Child Benefit and GST/HST credit, and may affect eligibility for certain workplace benefit plans. Each program has its own rules, so you should verify directly with the program.
