When are you considered common-law in Canada for tax purposes?

For federal tax purposes, you become common-law after living together in a conjugal relationship for 12 continuous months, OR if you have a child together by birth or adoption. Once common-law, you must file taxes reflecting your new status.

Do common-law partners have the same rights as married couples?

For federal tax purposes, common-law and married couples are treated identically. However, provincial family law varies — some provinces grant automatic property rights to common-law partners, while others (like Ontario) do not.

Can common-law partners split pension income?

Yes. Common-law partners can split eligible pension income starting at age 65, just like married couples. This includes RRIF withdrawals, life annuity payments, and certain pension plan payments.

Common-Law Relationships in Canada: Financial & Tax Guide (2026)

After 12 continuous months of living together (or immediately if you have a child), you’re common-law under Canadian tax law — and CRA treats you identically to a married couple. That unlocks benefits like spousal RRSP contributions, pension income splitting at 65, and pooled medical and charitable credits. But it also means your Canada Child Benefit and GST/HST credit are now calculated on combined family income, which often reduces them. The biggest gap between common-law and married couples isn’t taxes — it’s property rights. In Ontario, for example, common-law partners have no automatic right to property division on breakup, which makes a cohabitation agreement ($1,500–$3,500) one of the smartest financial moves you can make early in the relationship.

When Does Common-Law Status Begin?

Criteria	Timeline
Living together in conjugal relationship	12 continuous months
Have a child together (birth or adoption)	Immediately
CRA reporting deadline	First tax return after becoming common-law

“Conjugal relationship” means you live together as a couple, share finances or household responsibilities, and present yourselves as partners.

Tax Implications of Common-Law Status

Benefits

Benefit	How It Works
Spouse tax credit	Claim credit if partner’s income under ~$15,000
Income splitting (pension at 65+)	Transfer up to 50% of eligible pension income
Medical expense pooling	Claim all family expenses on one return
Charitable donation pooling	Combine donations for larger credits
RRSP spousal contributions	Contribute to partner’s RRSP
Tax-free asset transfers	Transfer property between partners without triggering gains
TFSA successor holder	Designate partner to take over TFSA

Potential Drawbacks

Impact	Details
GST/HST credit reduced	Based on combined family income
CCB reduced	Child benefit calculated on family income
OAS clawback combined	Higher combined income = more clawback
GIS eligibility reduced	Family income threshold applies

Common-Law vs Married: Key Differences

Issue	Married	Common-Law
Federal taxes	Identical	Identical
Property division (ON)	Equal division automatic	No automatic rights (unless cohabitation agreement)
Property division (BC)	Equal division automatic	Equal division after 2 years
Spousal support	Court can order	Court can order (varies by province)
Inheritance (no will)	Spouse inherits	May get nothing (province-dependent)
Pension survivor benefits	Spouse eligible	Partner eligible (plan-dependent)

Protecting Yourself

Cohabitation Agreement

What It Covers	Why It Matters
Property ownership	Clarify who owns what
Property division on breakup	Avoid costly disputes
Debt responsibility	Protect yourself from partner’s debts
Spousal support	Waive or establish expectations
Death provisions	Ensure partner is provided for

Cost: $1,500-3,500 for a lawyer-drafted agreement.

Title and Registration

Asset	How to Protect
Real estate	Joint tenancy or tenants in common (know the difference)
Bank accounts	Joint vs separate (consider liability)
Investments	TFSA successor vs beneficiary designation
Vehicles	Whose name is on registration

Tax Filing as Common-Law

Required Changes

Item	Action
Marital status	Change to “common-law” on first return
Family income	Report combined income for credits/benefits
GST/HST credit	Will be recalculated
CCB	Will be recalculated based on family income
Medical expenses	Can claim for partner

Optimize Your Taxes

Strategy	How
Claim all medical expenses on lower-income partner	Higher credit due to 3% net income threshold
Pool charitable donations on one return	May increase credit
Spousal RRSP contributions	Higher earner contributes to lower earner’s RRSP
Pension income splitting (65+)	Transfer up to 50% to lower-income partner

Breaking Up: Financial Implications

Separating Finances

Task	Timeline
Notify CRA of status change	First return after separation
Close joint bank accounts	Immediately
Remove from credit cards	Immediately
Update beneficiaries	RRSP, TFSA, insurance
Change locks, passwords	Security measure

Property Division

Province	Common-Law Rights
BC	Equal division after 2 years cohabitation
Alberta	No automatic rights (agreement needed)
Saskatchewan	No automatic rights (agreement needed)
Manitoba	After 3 years, some property rights
Ontario	No automatic property rights
Quebec	No automatic rights (very limited)
Atlantic provinces	Varies — check your province

Bottom Line

Update your CRA marital status as soon as you qualify as common-law — failure to do so can trigger repayment of benefits later. Take advantage of spousal RRSP contributions, medical-expense pooling, and pension splitting, but know that your CCB and GST/HST credits will shrink based on combined income. Get a cohabitation agreement to protect property rights (especially in Ontario and Quebec), and update RRSP/TFSA beneficiary designations and your will to reflect your partner.