# Common-Law Separation and the Family Home in Canada — Provincial Rules and Mortgage Mechanics

> How common-law couples divide the family home at separation — provincial property rights, spousal buyout mechanics, refinance thresholds, and lender documentation requirements across Canada.

Category: Refinance
Last verified: 2026-04-20
Source: https://ratellow.com/scenarios/common-law-separation-home-division-canada

## Who this is for
Unmarried cohabiting partners in Canada who are separating and need to resolve shared home ownership — either through a buyout, forced sale, or title transfer — without the automatic property-division framework that applies to married spouses.

## Summary
Unlike married spouses, common-law partners in most Canadian provinces have no automatic statutory right to an equal share of the family home — entitlement depends on title, cohabitation agreements, unjust enrichment claims, and province-specific legislation that varies dramatically from Ontario to BC to Quebec. The mortgage mechanics of a buyout or title transfer are governed by lender policy and OSFI B-20 regardless of province, but the legal foundation that determines who gets what must be resolved first, and that foundation differs materially by jurisdiction.

## Worked example
Two partners in Ontario cohabited for six years. The home was purchased for $780,000 with both names on title; current appraised value is $920,000 and the outstanding mortgage balance is $540,000, leaving $380,000 in equity. Partner A wants to buy out Partner B's 50% equity share ($190,000) and assume sole ownership. The existing mortgage is a 5-year fixed at 4.89% with 28 months remaining — breaking it triggers an IRD penalty estimated at $11,400.

- Gross equity to divide: $380,000 ($190,000 per partner at 50/50 title)
- Buyout refinance amount: $540,000 (existing balance) + $190,000 (buyout) = $730,000
- New LTV post-refinance: $730,000 / $920,000 = 79.3% — just under the 80% uninsured threshold
- IRD break penalty (estimated): $11,400 — factored into refinance proceeds or paid separately
- Stress-test qualifying rate: Contract rate + 200 bps or 5.25%, whichever is higher — Partner A qualifies alone on $730,000

## Framework
### Provincial property rights — the legal foundation before any mortgage move
**Ontario:** The Family Law Act's equalization regime applies only to married spouses. Common-law partners (defined as cohabiting 3+ years or in a relationship of some permanence with a child) have no automatic right to property division. Claims proceed under unjust enrichment or constructive trust doctrines — expensive and uncertain litigation unless a cohabitation agreement governs. Title is the default determinant.

**British Columbia:** The Family Law Act (2013) is the most expansive in Canada — it explicitly includes unmarried spouses who have lived together in a marriage-like relationship for at least 2 years. Family property (including the home, regardless of whose name is on title) is subject to equal division. BC common-law partners have near-equivalent rights to married spouses.

**Quebec:** The Civil Code does not recognize a common-law union (union de fait) for property division purposes. Each partner retains what they own; there is no family patrimony regime for de facto spouses. A notarized cohabitation agreement or undivided co-ownership deed governs entirely.

**Alberta, Saskatchewan, Manitoba:** Each has its own Adult Interdependent Partner or common-law framework with varying thresholds (typically 3 years cohabitation or a registered partnership). Alberta's Matrimonial Property Act does not apply to common-law couples; claims rely on unjust enrichment. Manitoba's Common-Law Partners' Property and Related Amendments Act (2002) provides more explicit division rights.

### The spousal buyout refinance — how lenders process it
CMHC's Spousal Buyout Program allows a refinance up to 95% LTV (insured) when one partner is buying out the other's equity interest — this program is available to common-law partners, not only married spouses, provided the separation is documented. The key documentation requirement is a signed separation agreement or court order confirming the equity split and the buyout obligation.

For uninsured refinances (LTV ≤ 80%), standard refinance rules apply: maximum 80% LTV, full stress-test qualification at the higher of contract rate + 200 bps or 5.25% (2026 MQR), and the departing partner must be formally removed from title and the mortgage. Most lenders require the separation agreement before issuing a commitment letter — a verbal arrangement or email exchange is insufficient.

If the buyout refinance pushes LTV above 80%, the CMHC Spousal Buyout route (up to 95% LTV, insured) becomes the operative path, with the standard CMHC premium tiers applying on the new insured amount.

### Breaking the existing mortgage — penalty arithmetic
A buyout refinance almost always requires breaking the existing mortgage unless the lender allows an assumption with a new co-borrower removed. For fixed-rate mortgages, the penalty is the greater of 3 months' interest or the IRD — and with rates having moved materially since 2021-2022 originations, IRD penalties on older low-rate mortgages can be substantial (often $15,000–$40,000 on a $500,000 balance).

For mortgages originated at 2024-2025 rates (4.5–5.5% range), the IRD is typically modest because the rate differential between the contract rate and current posted rates is narrow. Variable-rate mortgages carry a flat 3-month interest penalty regardless of timing.

The penalty is either absorbed into the refinance proceeds (increasing the new loan amount) or paid out of pocket. Factor it into the equity split negotiation — if Partner A is breaking a joint mortgage to execute the buyout, the penalty cost is a shared liability that should be reflected in the separation agreement.

### Title transfer without a full refinance — when it works and when it doesn't
If the departing partner is willing to be removed from title without receiving a cash buyout (e.g., the remaining partner assumes the full mortgage), some lenders will process a title transfer and mortgage assumption without triggering a full refinance. This preserves the existing rate and avoids break penalties.

However, most institutional lenders (Schedule I banks and major monolines) require the assuming partner to re-qualify under current B-20 stress-test standards as a sole borrower. If the remaining partner cannot qualify alone at the existing balance, the lender will not release the departing partner from the covenant — meaning the departing partner remains legally liable on the mortgage even after leaving title, which creates ongoing credit and liability exposure.

Alternative lenders (B-lenders) and some credit unions have more flexible assumption policies, but rates will be 75–150 bps above prime. This route is most viable when the remaining partner has strong standalone income and the existing mortgage balance is conservative relative to income.

### Cohabitation agreements — the instrument that resolves most of this in advance
A properly drafted cohabitation agreement (domestic contract under provincial family law legislation) can pre-specify how the home is divided, what constitutes a buyout trigger, how equity is calculated, and who bears break penalties. In Ontario, these are governed by s.53 of the Family Law Act; in BC, by s.92 of the Family Law Act; in Quebec, by a notarized agreement under the Civil Code.

Lenders do not require a cohabitation agreement to process a refinance, but its absence forces the parties into either a negotiated separation agreement (which requires both parties' cooperation) or litigation (which is slow and expensive). For couples who already own jointly without an agreement, the practical path is a jointly signed separation agreement prepared by independent legal counsel for each party — most lenders will accept this in lieu of a court order.

### Forced sale — the option of last resort
When partners cannot agree on a buyout price, who retains the property, or how to split equity, either party can apply to court for a partition and sale order under provincial partition legislation (e.g., Ontario's Partition Act, BC's Law and Equity Act). The court can order the property sold and proceeds divided according to title shares or as directed.

From a mortgage perspective, a forced sale triggers full discharge of the existing mortgage from sale proceeds, with any prepayment penalty paid from the proceeds before equity is distributed. If the property is underwater (mortgage balance exceeds sale price), both partners remain jointly and severally liable for the shortfall unless the lender agrees to a short sale or debt settlement — a scenario that has become more relevant in markets where values have softened from 2022 peaks.

## Key considerations
- Title registration is the default legal starting point in most provinces outside BC — if only one partner is on title, the other's claim depends entirely on constructive trust arguments or a cohabitation agreement. Verify title at the Land Registry before assuming a 50/50 split.
- The CMHC Spousal Buyout Program (up to 95% LTV insured) is available to common-law partners, but the lender will require a signed separation agreement or court order confirming the equity entitlement — without it, the file cannot proceed as a spousal buyout and defaults to standard refinance rules (80% LTV cap).
- In BC, the 2-year cohabitation threshold for Family Law Act property rights means a couple who separated before reaching 2 years has no statutory division rights — the date of separation relative to the cohabitation start date is legally material and should be documented.
- Quebec de facto spouses have no family patrimony rights under the Civil Code — each partner's claim is limited to what they can prove they contributed financially. Undivided co-ownership (indivision) on title is the primary mechanism for joint equity, and partition follows the Civil Code rules for indivision.
- If the departing partner is not formally released from the mortgage covenant, their debt-service obligations remain on their credit bureau and count against their TDS ratio for any future mortgage application — this can persist for years if the remaining partner does not refinance promptly.
- Capital gains tax may apply if the property was not the principal residence of both partners for the full ownership period — particularly relevant if one partner was not ordinarily resident in the home. CRA's principal residence exemption rules apply at the individual level, not the couple level.

## Common mistakes
- Assuming common-law equals married for property division purposes — outside BC, this assumption leads to costly litigation when the non-titled partner discovers they have no automatic statutory claim and must pursue unjust enrichment through the courts.
- Signing a separation agreement without independent legal advice — lenders and courts may not recognize an agreement where both parties used the same lawyer or where one party signed without counsel, potentially invalidating the document that the refinance depends on.
- Attempting a title transfer without confirming the remaining partner qualifies solo under B-20 stress test — the departing partner remains on the mortgage covenant until the lender formally releases them, creating ongoing liability that most departing partners do not anticipate.
- Ignoring the IRD penalty in the equity split negotiation — on a $600,000 mortgage with 2+ years remaining at a below-market rate, the penalty can exceed $20,000 and should be treated as a shared cost of separation, not absorbed unilaterally by the buying-out partner.
- Using current assessed value (MPAC in Ontario, BC Assessment) rather than an independent appraisal for the buyout price — assessed values lag market by 12-18 months and lenders will order their own appraisal regardless; using assessed value in the separation agreement can create a discrepancy that delays the refinance.
- Failing to update the separation agreement when the buyout refinance is delayed — if market values shift materially between the agreement date and the refinance close, the agreed buyout amount may no longer reflect actual equity, creating disputes and potential lender issues with the LTV calculation.

## Action steps
1. Obtain a current independent appraisal of the property before drafting any separation agreement — this establishes the equity baseline that both the legal agreement and the lender's refinance will reference.
2. Each partner should retain independent family law counsel in their province to confirm what statutory property rights apply given the cohabitation duration, title registration, and any existing cohabitation agreement.
3. Request a mortgage statement showing the current balance, remaining term, and a prepayment penalty calculation from the lender — this number belongs in the separation agreement as a shared liability.
4. If the buying-out partner intends to use the CMHC Spousal Buyout Program (LTV above 80%), confirm with a broker that the separation agreement language meets CMHC's documentation standard before finalizing the agreement.
5. Run a solo stress-test qualification for the partner retaining the property before committing to a buyout structure — if they cannot qualify alone at the new refinanced amount, the entire structure needs to be renegotiated before legal costs accumulate.
6. If the departing partner needs to be off the mortgage for credit bureau purposes within a specific timeframe (e.g., they are purchasing a new home), build a hard deadline into the separation agreement and confirm the lender's processing timeline — most institutional lenders require 45-60 days from complete application to fund.

## Sources
- Mortgage Loan Insurance — Homeownership Products — https://www.cmhc-schl.gc.ca/professionals/project-funding-and-mortgage-financing/mortgage-loan-insurance/mortgage-loan-insurance-homeownership-programs
- Guideline B-20 — Residential Mortgage Underwriting Practices and Procedures — https://www.osfi-bsif.gc.ca/en/guidance/guidance-library/final-revised-guideline-b-20-residential-mortgage-underwriting-practices-procedures
- Divorce Act (R.S.C., 1985, c. 3) — https://laws-lois.justice.gc.ca/eng/acts/D-3.4/
- Family Law Act — Property Division — https://www.gov.bc.ca/gov/content/life-events/divorce/family-justice/family-law/property-division
- Mortgages — Your Rights and Responsibilities — https://www.fcac-acfc.gc.ca/eng/resources/publications/mortgages/Pages/home.aspx