Key Takeaways
- 1.In Ontario, common-law partners have no automatic property equalization — each keeps what is in their name, creating potential gaps of $100K+ between partners with unequal asset ownership.
- 2.In BC, common-law partners gain near-identical property division rights to married couples after 2 years of cohabitation under the Family Law Act.
- 3.In Quebec, de facto spouses have virtually zero statutory property rights — no division, no spousal support, no inheritance rights without a will.
- 4.Spousal RRSP contributions work identically for common-law and married couples at the federal level — but DB pension survivor benefits may vary by plan and require explicit beneficiary designation.
- 5.Both common-law and married couples can designate only one principal residence per year between them — a trap for partners who each owned property before cohabiting.
The Provincial Map: Three Provinces, Three Completely Different Outcomes
Canadian family law is provincial jurisdiction, and the treatment of common-law relationships varies more than almost any other area of law across provinces. The federal government recognizes common-law partners for tax and benefit purposes after 12 months of cohabitation (or immediately with a child together), but property rights on separation are entirely a provincial matter.
This creates a situation where two identical couples — same income, same assets, same years together — face radically different financial outcomes on separation depending on their postal code. Understanding which province's rules apply to you is not a legal technicality. It is the single largest variable in your net worth calculation as a couple.
Province-by-Province Common-Law Property Rights
| Province | Recognition Trigger | Property Division | Spousal Support |
|---|---|---|---|
| British Columbia | 2 years cohabitation | Yes — mirrors married (FLA) | Yes |
| Ontario | 3 years (or child together) | No — keep what you own | Yes (after 3 years) |
| Quebec | No statutory recognition | No — zero default rights | No |
| Alberta | 3 years (or interdependent) | Unjust enrichment claims only | Yes |
| Saskatchewan | 2 years cohabitation | Yes — mirrors married | Yes |
| Manitoba | 3 years (or child together) | Yes — mirrors married | Yes |
The practical consequence: a common-law couple in Vancouver with $600K in combined assets has functional property protection after 2 years. The same couple in Toronto has none. The same couple in Montreal has none and cannot even claim spousal support. For a deeper look at how estate planning intersects with common-law status, see our Common-Law Spouse Beneficiary Calculator for Alberta.
Worked Example: $300K + $300K Separation in Three Provinces
Meet Jordan and Alex (composite example). They have been common-law partners for 6 years. Both are 35 years old. Combined household net worth: $600K. But the ownership is not evenly distributed across their names.
Asset Ownership Breakdown
| Asset | Jordan's Name | Alex's Name | Joint |
|---|---|---|---|
| Home equity | $0 | $0 | $200,000 |
| RRSP | $120,000 | $45,000 | — |
| TFSA | $82,000 | $55,000 | — |
| Non-registered investments | $60,000 | $0 | — |
| Vehicle | $18,000 | $12,000 | — |
| Cash savings | $5,000 | $3,000 | — |
| Total | $285,000 | $115,000 | $200,000 |
Jordan's individual net worth: $285,000 + $100,000 (half of joint) = $385,000. Alex's individual net worth: $115,000 + $100,000 = $215,000. Household total: $600,000. The gap between them: $170,000.
Separation Outcome by Province
| Province | Jordan Walks Away With | Alex Walks Away With | If They Were Married |
|---|---|---|---|
| BC (after 2+ years) | ~$300,000 | ~$300,000 | ~$300,000 each |
| Ontario | $385,000 | $215,000 | ~$300,000 each |
| Quebec | $385,000 | $215,000 | ~$300,000 each* |
*Quebec married couples under the default partnership of acquests regime share acquests (assets acquired during marriage) equally. Pre-marriage assets remain individual property.
The numbers are stark. In BC, the outcome is identical to marriage — Alex is protected. In Ontario and Quebec, Alex leaves with $170,000 less than Jordan despite contributing to the household for 6 years. This is not theoretical — it is the default legal outcome. Alex's only recourse in Ontario is a constructive trust or unjust enrichment claim, which requires proving direct financial contribution to Jordan's specific assets — an expensive, uncertain litigation process. In Quebec, even that path is more limited.
For couples in the $500K–$1M range, this gap is not abstract. A $170,000 difference at age 35 compounds to over $500,000 by age 60 at a 6% return. The lower-wealth partner's retirement trajectory changes fundamentally. For context on what the $500K and $1M milestones look like for Canadian households, see our $500K Net Worth Retirement Analysis and $1M Net Worth Breakdown.
Spousal RRSP: Where Common-Law and Marriage Are Equal
The CRA's definition of “spouse” for income tax purposes includes common-law partners who have lived together for 12 continuous months (or are parents of a child together). This means spousal RRSP contributions — one of the most powerful income-splitting tools for couples — work identically for common-law and married partners.
In the Jordan and Alex example, Jordan earns $130,000 and Alex earns $55,000. Jordan's marginal rate is 43.41% (Ontario combined federal/provincial on income between $111,733 and $150,000). Alex's marginal rate is 29.65% (income between $55,867 and $111,733). If Jordan contributes $10,000 to a spousal RRSP in Alex's name, the household saves $1,376 in tax ($10,000 × (43.41% − 29.65%)) compared to Jordan contributing to their own RRSP and both withdrawing at their respective rates in retirement.
The 3-year attribution rule is the same for both: if Alex withdraws from the spousal RRSP within 3 calendar years of Jordan's last contribution, the withdrawal is taxed in Jordan's hands, not Alex's. This is important in a separation context — if the relationship breaks down, the lower-income partner should wait until 3 years after the last contribution to withdraw without attribution.
DB Pension Survivor Benefits: The Designation Trap
Defined benefit pension plans are often the largest single asset in a Canadian household net worth calculation, sometimes exceeding $500,000 in present value for a senior public-sector employee. The survivor benefit — typically 50% to 66.7% of the pension payable to the surviving spouse for life — is worth hundreds of thousands of dollars in actuarial terms.
Most federally regulated DB plans and provincial public-sector plans recognize common-law partners after 1 year of continuous cohabitation. The Canada Pension Plan (CPP) survivor's pension similarly recognizes common-law partners after 1 year. In practice, this means a common-law partner is typically entitled to the same survivor benefit as a married spouse.
The risk is in the designation. If a plan member was previously married, divorced, and then entered a common-law relationship without updating their beneficiary designation, the plan may pay the survivor benefit to the ex-spouse — even though the common-law partner is the current “spouse” under the plan definition. Some plans default to the legal spouse as defined in their plan text, not the CRA definition. Always confirm three things: (1) your plan's definition of “spouse,” (2) your current beneficiary designation on file, and (3) whether your province requires a formal waiver from an ex-spouse before the benefit redirects. For the full beneficiary calculation mechanics, see our Spousal Beneficiary Inheritance Calculator.
Individual vs. Household Net Worth: When Each Number Matters
Every net worth calculation implicitly answers a question, and the right metric depends on the question you are asking.
When to Use Household Net Worth
- Tax planning: The CRA uses combined family net income for income-tested benefits (Canada Child Benefit, GST/HST credit, OAS clawback). Whether you are married or common-law, these are assessed on household income.
- Retirement planning: If you plan to retire together, the combined asset pool determines whether you can sustain your joint lifestyle. A household with $800K total has different options than two individuals with $400K each — the household can optimize CPP timing, pension income splitting, and withdrawal sequencing across both partners.
- Mortgage qualification: Lenders assess household income and household debt for qualification purposes, regardless of relationship status.
When to Use Individual Net Worth
- Separation planning: In Ontario and Quebec, your individual net worth is your actual outcome. Do not confuse household wealth with personal wealth if you are common-law in these provinces.
- Estate planning: Assets pass through your estate based on ownership and beneficiary designations, not household membership. Each partner needs their own will, their own beneficiary designations, and their own understanding of what they individually own.
- Credit and liability exposure: Debts in one partner's name are that partner's responsibility (with limited exceptions for family debts in some provinces). Individual net worth reflects your actual credit position.
The practical approach: maintain a spreadsheet with three columns — Jordan's assets, Alex's assets, and joint assets. Calculate both individual and household totals quarterly. If you are common-law in Ontario or Quebec, your individual column is the number that determines your financial security. For a broader perspective on how net worth scales for Canadian households, see our $2M Ontario Net Worth Tax Analysis.
The Principal Residence Exemption: A Shared Constraint
One area where common-law and married couples face identical rules — and identical traps — is the principal residence exemption (PRE). Once the CRA recognizes you as a couple (12 months of cohabitation), you can collectively designate only one property as your principal residence per year.
This matters most when partners each owned a property before moving in together. Suppose Jordan owns a condo purchased for $350,000 (now worth $420,000) and Alex owns a townhouse purchased for $500,000 (now worth $600,000). Before cohabiting, each could designate their own property as principal residence, sheltering all gains from tax. After 12 months of cohabitation, only one property qualifies per year.
If they designate Alex's townhouse as the principal residence (larger annual gain), Jordan's condo accumulates taxable capital gains of approximately $10,000–$15,000/year. Over 5 years, that is $50,000–$75,000 in taxable gains, resulting in $12,500–$18,750 in capital gains tax (at a 50% inclusion rate and combined marginal rate of approximately 50%). This tax bill would not exist if they remained legally single.
The planning opportunity: if one partner will sell their property shortly after moving in together, the timing of cohabitation relative to the sale date matters. Selling Jordan's condo within the first tax year of cohabitation allows the PRE to be applied to it for years owned before the relationship, minimizing the taxable gain. Consult a tax professional to optimize the designation strategy across both properties. For the full mechanics of PRE calculations, see our Principal Residence Exemption Calculator.
The Cohabitation Agreement: The $500 Document That Protects $200K+
In Ontario and Quebec, a cohabitation agreement is the only mechanism to create property-sharing rights that do not exist by default. In BC, it can modify the default 50/50 division if both partners prefer a different arrangement.
A well-drafted cohabitation agreement typically costs $1,500–$3,000 total (each partner needs independent legal advice for the agreement to be enforceable). It should cover: how property acquired during cohabitation is divided on separation, what happens to the jointly owned home, how registered accounts (RRSP, TFSA) are treated, spousal support entitlement and duration, and what happens to debts.
The cost-benefit calculation is straightforward. In the Jordan and Alex example, the agreement costs $2,500. Without it, Alex's exposure on separation in Ontario is $170,000 less than an equalized split. Even if you assign only a 10% probability to separation over the lifetime of the relationship, the expected value of the agreement is $17,000 — a 6.8× return on investment. At a 25% lifetime probability (approximately the Canadian average for common-law breakdowns over 20 years), the expected value exceeds $42,000.
Important Disclaimer
This article provides general information based on 2026 Canadian federal tax rules and provincial family law in British Columbia, Ontario, and Quebec. Provincial property division and spousal support rules vary significantly and may change through legislative reform or court decisions. Quebec's treatment of de facto spouses has been the subject of ongoing constitutional challenges and proposed reforms — verify current status before making decisions. The CRA definition of common-law partner (12 months continuous cohabitation or parents of a child) applies for federal tax purposes; provincial definitions for family law purposes differ. The worked separation example uses simplified assumptions and does not account for debts, tax consequences of asset transfers, or the specific terms of registered account division (which may require a court order or written separation agreement). DB pension survivor benefit rules vary by plan and jurisdiction — always verify with your plan administrator. Cohabitation agreement costs are estimates and vary by jurisdiction and complexity. Always consult a family lawyer licensed in your province, a qualified tax professional (CPA), and a certified financial planner before making legal or financial decisions based on this article. This is not legal, tax, or financial advice.