Buying with a Partner, Family, or Friend

More Canadians than ever are pooling resources to buy a home. Whether you are purchasing with a romantic partner, a parent, a sibling, or a close friend, co-buying can be a smart path to homeownership in an era of record-high prices — but only if everyone involved goes in with clear expectations, proper legal protections, and a shared understanding of the risks.

Why Co-Buying Is Growing

The math is straightforward. The average home price in Canada sits above $650,000 nationally, and in markets like Toronto and Vancouver, a typical detached home exceeds $1,000,000. For a single buyer earning $70,000 per year, qualifying for a mortgage large enough to buy in these markets is extremely difficult — even with a solid credit score and a healthy down payment.

Combining two incomes changes the equation dramatically:

Higher qualifying income means a larger mortgage and access to better properties
Shared down payment gets you to the 20% threshold faster, eliminating CMHC insurance premiums
Shared carrying costs make monthly payments more manageable (mortgage, property tax, insurance, maintenance)
Shared closing costs reduce the upfront cash each person needs

According to Statistics Canada, roughly 1 in 4 first-time buyers now purchases with someone other than a spouse or partner. The trend is accelerating as affordability continues to tighten across the country.

Legal Ownership Structures

When two or more people buy a property together, how you hold title has significant legal and financial consequences. In Canada, there are two primary structures.

Joint Tenancy

Joint tenancy means all owners hold the property equally and have a right of survivorship. If one owner dies, their share automatically passes to the surviving owner(s) — it does not go through the deceased person’s estate or will.

Ownership is always equal. Two joint tenants each own 50%. Three joint tenants each own 33.3%. You cannot have unequal shares.
Most common for married and common-law couples because the automatic survivorship aligns with how most couples want their assets handled.
All four “unities” must be present: unity of time (acquired at the same time), possession (equal right to use the whole property), interest (equal shares), and title (same deed).
Any joint tenant can sever the joint tenancy unilaterally by transferring their interest, which converts it to a tenancy in common.

Tenants in Common

Tenants in common each own a defined share of the property, and those shares can be unequal. There is no right of survivorship — when one owner dies, their share passes through their estate according to their will.

Shares can be any proportion. Two people can own 60/40, 70/30, or any other split that reflects their respective contributions.
Better for friends, siblings, and parent-child arrangements because it allows flexible ownership percentages and each person can leave their share to whoever they choose.
Each owner can sell, mortgage, or transfer their share independently (though practically, finding a buyer for a partial interest in a home is difficult).
Requires clear documentation of each person’s ownership percentage, ideally in a co-ownership agreement.

Which Structure Should You Choose?

Factor	Joint Tenancy	Tenants in Common
Ownership shares	Always equal	Can be unequal
Right of survivorship	Yes	No
Estate planning flexibility	Limited	Full
Best for	Married/common-law couples	Friends, family, unequal contributions
Can sell share independently	Must sever first	Yes

Co-Borrower vs Co-Signer vs Guarantor

These three terms are often confused, but they represent very different levels of involvement and risk.

Co-Borrower

A co-borrower is on both the mortgage and the property title. They are a full partner in the purchase.

Both people’s incomes qualify for the mortgage
Both people’s debts count against qualification
Both people build equity in the property
Both people are equally liable for the full mortgage payment
Both people’s credit is affected by the mortgage (positively if payments are on time, negatively if they are not)

When it makes sense: When both parties are genuinely buying the home together, will live there, and will share costs and equity. This is the standard arrangement for couples and co-buying friends or siblings.

Co-Signer

A co-signer is on the mortgage but NOT on the property title. They are helping you qualify for the mortgage by lending their income and creditworthiness, but they do not own any part of the home.

The co-signer’s income helps you qualify for a larger mortgage
The co-signer’s debts also count against qualification
The co-signer has no ownership interest in the property
The co-signer is fully liable for the mortgage if you default
The mortgage appears on the co-signer’s credit report and affects their ability to borrow for their own purposes

When it makes sense: When a parent or family member wants to help you qualify but does not want (or need) an ownership stake. Common for parents helping adult children who have good income but need a boost to meet lender thresholds.

Guarantor

A guarantor backs the mortgage but has less direct involvement than a co-signer.

A guarantor is typically called upon only if the primary borrower defaults
The guarantee may or may not appear on the guarantor’s credit report (depends on the lender)
The guarantor has no ownership interest in the property
The guarantor’s exposure is usually limited to the mortgage amount, but the terms vary by lender
Fewer lenders offer guarantor arrangements compared to co-signer options

When it makes sense: When a family member wants to provide a safety net without being directly responsible for the ongoing mortgage. Guarantor programs are less common in Canada than co-signer arrangements, and availability varies by lender.

How Co-Buying Affects Government Programs

One of the biggest advantages of co-buying is that each buyer can access their own set of first-time buyer programs. The combined benefit can be substantial.

First Home Savings Account (FHSA)

Each co-buyer who qualifies as a first-time home buyer can use their own FHSA. With a lifetime contribution limit of $40,000 per person, two first-time buyers can contribute a combined $80,000 to their FHSAs — all tax-deductible on contribution and tax-free on withdrawal.

Both buyers must individually meet the FHSA eligibility requirements (Canadian resident, first-time buyer, age 18+)
Each person withdraws from their own FHSA independently
The withdrawals do not need to be equal — one person might have $40,000 saved and the other $25,000

RRSP Home Buyers’ Plan (HBP)

Each co-buyer can withdraw up to $60,000 from their own RRSPs under the HBP, for a combined maximum of $120,000. Each person has their own 15-year repayment schedule that begins the second year after withdrawal.

Each person must individually qualify as a first-time buyer for HBP purposes
The funds must have been in the RRSP for at least 90 days before withdrawal
Each person repays their own withdrawal independently — if one person withdrew $60,000 and the other $30,000, their annual repayment amounts will differ ($4,000/year vs $2,000/year)

Home Buyers’ Tax Credit (HBTC)

Each first-time buyer claims their own $10,000 non-refundable tax credit, worth $1,500 per person in federal tax savings. For two qualifying buyers, that is $3,000 combined. The credit can be split between co-buyers in any proportion, but the total claimed cannot exceed $10,000 per home.

Land Transfer Tax Rebates

Provincial land transfer tax rebates for first-time buyers are handled differently depending on the province. In Ontario, for example:

If both buyers are first-time buyers, the full rebate (up to $4,000) is available
If only one buyer is a first-time buyer, only their proportionate share of the rebate is available (e.g., 50% ownership = up to $2,000 rebate)
If one buyer is NOT a first-time buyer, the other can still claim their portion

What If One Co-Buyer Is Not a First-Time Buyer?

This is a common scenario — for example, a parent who already owns a home co-buying with their adult child. The key principle is that each person’s eligibility is assessed individually.

The first-time buyer can still use their own FHSA, HBP, and HBTC
The non-first-time buyer cannot access these programs
Land transfer tax rebates are typically prorated based on the first-time buyer’s ownership share
The non-first-time buyer’s portion of the purchase does not disqualify the first-time buyer from their programs

The Co-Ownership Agreement

If there is one piece of advice in this entire section that you absolutely must follow, it is this: get a co-ownership agreement drafted by a lawyer before you close on the property. This applies to every co-buying arrangement — including romantic partners, especially those who are not married.

A co-ownership agreement is a legally binding contract between the co-buyers that addresses what happens in every foreseeable scenario. Without one, you are relying on provincial default rules that may not reflect your intentions at all.

What the Agreement Should Cover

Ownership percentages and financial contributions:

Each person’s ownership share (e.g., 50/50, 60/40)
How the down payment was split and by whom
Whether unequal contributions create a loan to be repaid or simply reflect unequal ownership

Ongoing cost sharing:

Who pays what portion of the mortgage, property taxes, home insurance, and utilities
How maintenance and repair costs are divided (proportional to ownership? 50/50 regardless?)
How major expenses are handled (new roof, furnace replacement, renovations) — is there a dollar threshold that requires mutual agreement?
What happens if one person wants to renovate and the other does not

Exit scenarios:

Right of first refusal: If one person wants to sell, the other has the first opportunity to buy their share at fair market value
Buyout terms: How the buyout price is determined (independent appraisal, average of two appraisals, agreed-upon formula)
Buyout timeline: How long the buying party has to arrange financing (typically 60 to 120 days)
Forced sale: If neither party can buy the other out, the property is listed for sale. Who chooses the agent? What is the minimum acceptable price?
Timeline for resolution: A clear timeline from the initial decision to sell through to closing

Default and inability to pay:

What happens if one person cannot make their share of the mortgage payment
Grace period (e.g., 30 to 60 days) before remedies kick in
Whether the paying party’s additional payments are treated as a loan to the non-paying party (with interest)
At what point the default triggers a forced sale or buyout

Relationship breakdown:

For married couples, provincial family law generally governs how the property is divided — but a co-ownership agreement can supplement these protections
For common-law partners, protections vary dramatically by province. In some provinces, common-law partners have no automatic right to property division. The co-ownership agreement is your primary protection.
For friends and siblings, the agreement is essentially the only legal framework governing your arrangement

Dispute resolution:

Mediation as a first step (less expensive and adversarial than court)
Arbitration as a second step if mediation fails
Which province’s laws govern the agreement

Other provisions:

Life insurance requirements (if one person dies, can the other afford to buy out the estate’s share?)
What happens if one person wants to move out but keep their ownership
Restrictions on one person renting out their “portion” of the home
How decisions about refinancing are made

How Much Does It Cost?

Expect to pay $1,500 to $3,000 for a lawyer to draft a comprehensive co-ownership agreement. This is not the place to cut corners. A $2,000 agreement today can prevent a $50,000 legal dispute later.

Some lawyers offer packages that include both the co-ownership agreement and the real estate closing, which can save money on the combined cost.

Mortgage Qualification When Co-Buying

When two people apply for a mortgage together, the lender looks at the combined financial picture — which can work for you and against you.

The Positives

Combined income increases borrowing power. Two people earning $70,000 each have a combined household income of $140,000, potentially qualifying for a mortgage of $550,000 to $650,000 depending on other factors.
Combined down payment gets you further. If each person has $50,000 saved, the $100,000 combined down payment could eliminate the need for CMHC insurance on a home priced under $500,000.

The Challenges

All debts from both people count. If your co-buyer has a $500/month car payment and $200/month student loan, those debts reduce your combined qualifying amount. The lender calculates the TDS ratio using everyone’s debts.
Credit score matters — and lenders use the lower one. Most lenders use the lower credit score (or the lower median score if pulling from multiple bureaus) to determine the interest rate. If you have a score of 780 but your co-buyer has 640, you may face a higher rate — or struggle to qualify with certain lenders. See our credit score guide for improvement strategies.

Worked Example

Sarah and Alex want to buy together:

	Sarah	Alex	Combined
Annual income	$80,000	$65,000	$145,000
Monthly gross income	$6,667	$5,417	$12,083
Monthly debts	$300 (student loan)	$500 (car) + $150 (credit line)	$950
Credit score	750	690	690 (lower used)
Down payment saved	$55,000	$35,000	$90,000

GDS calculation (32% maximum): $12,083 x 0.32 = $3,867 available for housing costs per month

TDS calculation (44% maximum): $12,083 x 0.44 = $5,317 for all debts $5,317 - $950 (existing debts) = $4,367 available for housing costs

The GDS ratio is the binding constraint here at $3,867/month for housing. Using the stress test rate (roughly 5.25% or the contract rate + 2%, whichever is higher), Sarah and Alex could qualify for a mortgage of approximately $560,000 to $600,000. Combined with their $90,000 down payment, they are looking at homes in the $650,000 to $690,000 range.

However, because the lender uses Alex’s 690 credit score, they may not qualify for the very best rates. A score of 690 is acceptable for most lenders but may result in a rate 0.10% to 0.20% higher than if both buyers had scores above 720. On a $560,000 mortgage, that could mean an extra $5,000 to $10,000 in interest over a 5-year term.

If Sarah bought alone: Her $80,000 income with $300/month in debt would qualify her for approximately $370,000 to $400,000. Combined with her $55,000 down payment, she could afford homes up to about $430,000 to $455,000.

The co-buying advantage: Together, Sarah and Alex can afford a home worth roughly $200,000 to $250,000 more than Sarah could alone.

Common Co-Buying Scenarios

Romantic Partners

Married couples have the most legal protection. Provincial family law in every province provides rules for dividing the matrimonial home if the marriage ends, regardless of whose name is on the title. In most provinces, the matrimonial home is treated as a shared asset.

Common-law couples have significantly less protection, and the rules vary by province. In British Columbia, couples who have lived together for 2+ years have property division rights similar to married couples. In Ontario, common-law partners have no automatic right to property division — if the relationship ends and only one person is on the title, the other may have no legal claim to the property. A co-ownership agreement is essential.

Dating couples who are not common-law have the least legal protection. From a legal perspective, this arrangement is closer to friends buying together. Treat it that way: get a co-ownership agreement, document everything, and ensure both names are on the title with ownership shares clearly defined.

Parents Helping Adult Children

Parents have several options, each with different implications:

Parent as co-borrower (on title and mortgage): Parent builds equity but the property counts as a second property for the parent (no principal residence exemption on the parent’s share). Affects the parent’s borrowing capacity for other purposes.
Parent as co-signer (on mortgage, not on title): Helps the child qualify. Parent does not build equity but is liable for the mortgage. The mortgage appears on the parent’s credit report.
Gifted down payment (parent not on title or mortgage): Cleanest option. Parent gives money for the down payment. Lender will require a gift letter confirming the money is a gift, not a loan, with no expectation of repayment. Does not affect the parent’s borrowing capacity.
Parent lending the down payment: Lenders treat a loan from parents as debt, which reduces the child’s qualifying amount. Most lenders prefer to see a true gift.

Friends Buying Together

Buying with a friend can be a practical path to homeownership, but it requires the most careful planning because there is no family law framework to fall back on.

Always use tenants in common so shares can be unequal if contributions are unequal
A co-ownership agreement is absolutely mandatory — no exceptions
Discuss and agree on a realistic timeline (how long do you plan to co-own?)
Plan for life changes: what if one person gets into a relationship and their partner wants to move in? What if one person gets a job offer in another city?

Siblings

Similar to buying with a friend, but family dynamics add a layer of complexity. Siblings may have different expectations about family obligation, and disagreements can strain the broader family relationship.

Use a co-ownership agreement just as you would with a friend
Include a dispute resolution clause — involving other family members as informal mediators is not the same as having a formal process
Be explicit about what happens if one sibling’s financial situation changes

Risks and How to Protect Yourself

Co-buying introduces risks that solo buyers do not face. Acknowledging them upfront is not pessimistic — it is practical.

Financial Risk

One party’s financial situation changes. Job loss, new debt, credit damage, or unexpected expenses can leave one person unable to make their share of the payments. The mortgage does not care about your internal arrangement — the lender will pursue both borrowers.
Protection: The co-ownership agreement should specify a grace period and remedies. Each co-buyer should maintain their own emergency fund (3 to 6 months of their share of costs). Consider disability and critical illness insurance.

Relationship Risk

Relationship breakdown. Whether romantic or platonic, relationships change. Divorce, break-ups, and falling-outs happen, and they are far more complicated when a shared property is involved.
Protection: The co-ownership agreement should detail exactly what happens when someone wants out. Married couples have provincial family law as a backstop. Everyone else needs the agreement.

Decision-Making Risk

Disagreements on selling, renovations, or refinancing. One person may want to sell after 3 years while the other wants to hold for 10. One person may want to renovate the kitchen for $40,000 while the other thinks it is a waste of money. One person may want to refinance to access equity while the other prefers to pay down the mortgage.
Protection: The co-ownership agreement should establish a process for making major decisions. Some agreements require unanimous consent for decisions above a dollar threshold (e.g., $5,000). Others give one party the right to proceed with a renovation if they pay for it entirely.

Death of a Co-Owner

If you hold as joint tenants, the surviving owner automatically inherits the deceased’s share. This is straightforward but means the deceased cannot leave their share to anyone else in their will.
If you hold as tenants in common, the deceased’s share goes through their estate. The surviving co-owner may end up sharing ownership with the deceased’s heirs — who may want to sell immediately.
Protection: Life insurance on each co-owner is strongly recommended. A policy large enough to cover the other person’s share of the mortgage ensures the surviving owner can buy out the estate or pay off the mortgage without being forced to sell. Even a term life insurance policy sufficient to cover the mortgage balance is relatively affordable — often $30 to $60 per month for a healthy person in their 30s.

Checklist Before Co-Buying

Work through every item before signing any agreements.

Financial Alignment

You have had a candid conversation about each person’s income, debts, credit score, and savings
You have agreed on how the down payment will be split
You have agreed on how monthly costs will be divided (mortgage, taxes, insurance, utilities, maintenance)
Each person has pulled their own credit report and shared the results
You have discussed what happens if one person’s financial situation changes

Legal Protections

You have chosen an ownership structure (joint tenancy or tenants in common) that fits your situation
You have hired a real estate lawyer to draft a co-ownership agreement
The co-ownership agreement covers exit scenarios, default, buyout terms, and dispute resolution
Each person has updated their will to reflect the co-ownership arrangement
You have discussed life insurance to cover the mortgage in case of death

Government Programs

Each first-time buyer has confirmed their eligibility for FHSA, HBP, and HBTC
Each person’s FHSA and RRSP contributions are seasoned (90 days in the RRSP for HBP, FHSA funds available for qualifying withdrawal)
You understand how land transfer tax rebates apply to your specific ownership split
If one person is not a first-time buyer, you understand which programs the other can still access

Mortgage Preparation

Both people have spoken with a mortgage broker about combined qualification
You understand how both credit scores affect the interest rate
You have calculated combined GDS and TDS ratios with all debts included
You have a plan for each person’s financial contribution to the down payment, closing costs, and ongoing expenses

The Conversation

You have discussed a realistic timeline — how long do you plan to co-own?
You have discussed what happens if one person wants to sell and the other does not
You have discussed how major decisions (renovations, refinancing) will be made
You have discussed what happens if one person wants to move in a partner or family member
You have been honest about your risk tolerance, spending habits, and long-term financial goals

Co-buying is not for everyone, but for those who approach it with clear communication, proper legal protections, and realistic expectations, it can be a powerful way to enter the housing market years sooner than you could alone. The key is preparation: get the right legal structure, document everything, protect each other with insurance and agreements, and go in with your eyes open.

Next: First Home Savings Account (FHSA)

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