# Parent Buying a Property for an Adult Child to Live In: Mortgage and Tax Mechanics

> How Canadian parents structure a second-property purchase for an adult child — down payment rules, second-home vs. rental classification, TDS impact, and CRA attribution traps.

Category: Purchase
Last verified: 2026-04-20
Source: https://ratellow.com/scenarios/parent-buying-property-adult-child-canada

## Who this is for
Canadian homeowners (typically 45-65) who own their primary residence and want to purchase a second property for an adult child to occupy, either rent-free or at below-market rent.

## Summary
When a parent purchases a property for an adult child to occupy, lenders classify it as a second home — not an investment property — provided no arm's-length rental income is generated. That classification carries a minimum 5-20% down payment depending on price and insured eligibility, but the parent's full TDS must absorb both mortgage payments without rental income offset. CRA's treatment of any rent charged, the principal-residence exemption allocation, and potential attribution rules create a parallel tax layer that must be structured before closing, not after.

## Worked example
A parent in Ontario owns a primary residence with a $280,000 remaining mortgage at 4.84% and earns $145,000 gross employment income. They purchase a $650,000 condo for their 24-year-old child to occupy rent-free. The purchase is in the parent's name only, with a 20% down payment ($130,000) to avoid CMHC insurance on a second property.

- Purchase price: $650,000 (uninsured, 20% down)
- New mortgage amount: $520,000 at ~5.14% 5-yr fixed (2026 market)
- Combined monthly debt obligations (both mortgages): ~$5,820/month (~$3,060 new + ~$1,490 existing + property tax/heat)
- Parent TDS at stress-test rate (7.14%): ~52% — above the 44% guideline; requires income augmentation or co-borrower
- Rental income offset available: $0 (rent-free family use; lender cannot credit rental income)

## Framework
### Second-home vs. investment-property classification
Lenders distinguish between a **second home** (family use, no rental income) and an **investment property** (arm's-length tenant, rental income credited). A property purchased for an adult child to occupy rent-free is underwritten as a second home. The practical consequence: **no rental income offset is available** to reduce TDS, and the full PITH (principal, interest, taxes, heat) of both properties loads onto the parent's debt-service ratios. Some lenders apply a modest notional rental credit even for family-use properties — roughly 50-80% of market rent — but this is lender-specific and not universal. Confirm the policy before selecting a lender. If the child pays market rent and a lease is in place, the property may qualify as an investment property, unlocking a rental offset but triggering different down-payment minimums (typically 20%) and CRA income-reporting obligations.

### Down payment requirements and CMHC eligibility
CMHC insured financing is available on a second property only if the parent does not already have an insured mortgage on their primary residence and the second property meets the insured purchase price cap (post-December 2024: $1.5M). In practice, most parents purchasing a second property for a child carry an existing insured or conventional mortgage, and lenders treat the second purchase as **conventional (uninsured)**, requiring a minimum 20% down payment. If the parent's primary mortgage is fully paid off and the second property is under $1.5M, insured financing at 5% down is technically available — but the combined TDS burden at high-ratio leverage is rarely serviceable on a single income. The gifted-down-payment rules apply if the parent gifts funds to a child who takes title: the gift must be documented as non-repayable with a signed gift letter, and the child must qualify independently under B-20 stress-test standards.

### Stress-test and TDS mechanics for the parent borrower
Under OSFI Guideline B-20, the qualifying rate is the greater of the contract rate plus 200 bps or 5.25% — in the current environment (5.14% 5-yr fixed), the stress-test rate is approximately **7.14%**. The parent's TDS must remain at or below 44% at that rate, incorporating: existing primary mortgage PITH, new second-property PITH, all other monthly obligations (car loans, lines of credit, credit cards at 3% of balance). In the worked example above, the parent's TDS breaches 44% without a co-borrower or income augmentation. **Solutions used in practice:** (1) adding the adult child as a co-borrower if they have qualifying income; (2) adding a spouse or partner; (3) reducing the purchase price or increasing the down payment to lower the new mortgage; (4) routing through an alternative lender (Equitable, Home Trust, Haventree) that applies a 45-50% TDS ceiling with a rate premium of 75-150 bps.

### Title structure and its downstream consequences
Three common title structures each carry different mortgage, tax, and estate implications:

**1. Parent on title alone.** Simplest for mortgage qualification if the child has no income. Parent retains full control. Property does not qualify for the child's principal-residence exemption (PRE) unless the child is added to title. On death, the property forms part of the parent's estate and may trigger a deemed disposition at fair market value.

**2. Parent and child as joint tenants or tenants-in-common.** Child can designate the property as their principal residence (if they ordinarily inhabit it), sheltering capital gains on their share. However, the child must qualify as a co-borrower under B-20 or be added as a guarantor — lender policies vary. Joint tenancy triggers right of survivorship; tenants-in-common allows proportional estate planning.

**3. Child on title alone, parent as guarantor.** Child must independently qualify under stress-test. Parent's guarantee is a contingent liability — most lenders will include it in the parent's TDS for any future borrowing. This structure is cleanest for PRE purposes but requires the child to have sufficient income.

### CRA tax considerations: rent, PRE, and attribution
**Rent-free use:** No rental income to report, but the parent cannot deduct any carrying costs (mortgage interest, property tax, maintenance) against income. The property is a personal-use asset.

**Below-market rent:** CRA's position is that rental income must be reported at the amount received, but losses from a below-market arrangement are generally not deductible — the property is deemed to lack a reasonable expectation of profit. Charging market rent avoids this trap but creates a landlord-tenant relationship with full income-reporting obligations.

**Principal-residence exemption:** Only one property per family unit (spouse/minor children) can be designated as a principal residence per year. If the parent's primary home and the child's property are both owned by the parent, only one can be sheltered per year. Adding the adult child (who forms a separate family unit) to title allows both properties to claim the PRE simultaneously — a significant planning opportunity.

**Attribution rules:** If the parent loans money to the child at below the CRA prescribed rate to fund a down payment, income or gains may attribute back to the parent. A properly documented prescribed-rate loan or an outright gift avoids attribution.

### Lender policy spread on family-use second properties
Policy divergence across lenders is material on this file type. **Schedule A banks** (RBC, TD, BMO, Scotiabank, CIBC) generally underwrite strictly: no rental offset for family-use, 20% minimum down, full TDS at stress-test rate. **Monoline lenders** (First National, MCAP, Radius) follow similar B-20 standards but some allow a notional rental credit of 50-70% of market rent even for family occupancy if the parent can document the arrangement. **Alternative lenders** (Equitable Bank, Home Trust, Haventree) will go to 45-50% TDS and may accept a broader income picture, at a rate premium. **Credit unions** (provincially regulated, not subject to OSFI B-20 directly) apply their own underwriting standards — some are more flexible on TDS ceilings and family-use rental credits, particularly in BC and Ontario. A broker with access to all four tiers is essential on a file where TDS is the binding constraint.

## Key considerations
- The parent's existing mortgage balance and rate directly determine whether the second purchase is serviceable. Run the combined TDS calculation before viewing properties — not after an accepted offer.
- If the child has employment income, adding them as a co-borrower can be the difference between approval and decline. Their income reduces the parent's effective TDS burden, but they become jointly liable on the mortgage and the debt appears on their credit bureau.
- Provincial land transfer tax applies on the full purchase price in Ontario, BC, and other provinces — there is no family-use exemption. In Ontario, a $650,000 purchase triggers approximately $10,475 in provincial LTT plus $10,475 in Toronto LTT if applicable. Budget for this at closing.
- If the parent intends to eventually transfer the property to the child, a sale at fair market value (even to a family member) is required to avoid a deemed disposition at FMV under the Income Tax Act. Gifting the property triggers capital gains on any accrued appreciation.
- Life and disability insurance on the parent-borrower is structurally important here: if the parent dies or becomes disabled, the child has no legal right to remain in the property unless they are on title or the estate plan addresses it explicitly.
- In Quebec, the civil law framework governs co-ownership differently from common-law provinces — undivided co-ownership (indivision) has specific rules around partition and hypothec registration that differ from Ontario joint tenancy. Quebec-based transactions should involve a notary familiar with mortgage and succession law.

## Common mistakes
- Structuring the purchase as a rental property to access rental income offsets, then having the child occupy it rent-free — lenders and CRA both treat the actual use as determinative, not the stated intent. Misrepresenting occupancy on a mortgage application is mortgage fraud under the Criminal Code.
- Ignoring TDS until after the offer is accepted. A parent with a $280,000 primary mortgage and $145,000 income will fail the stress test on a $520,000 second mortgage at most prime lenders — discovering this post-offer costs the deposit.
- Putting the property solely in the parent's name without considering the PRE split. The parent can only shelter one property per year; the adult child's separate family unit status is the mechanism that allows both properties to claim PRE simultaneously, but only if the child is on title.
- Charging nominal rent (e.g., $500/month on a $2,800 market-rent property) believing it creates deductibility. CRA's reasonable-expectation-of-profit test will deny the losses, and the parent still has rental income to report — the worst of both outcomes.
- Using an undocumented family loan for the down payment. If the parent lends the child money at 0% interest to fund a down payment and the child takes title, CRA's attribution rules may apply to income earned on the property. A prescribed-rate loan agreement or a documented gift letter resolves this.
- Assuming the child's future first-time home buyer status is preserved. If the child is on title to this property, they are no longer a first-time buyer for purposes of the First Home Savings Account (FHSA) contribution room, the Home Buyers' Plan RRSP withdrawal, or provincial first-time buyer land transfer tax rebates.

## Action steps
1. Calculate the parent's combined TDS at the stress-test rate (contract rate + 200 bps, minimum 5.25%) before engaging a realtor. Include both PITH obligations, all existing debt, and zero rental income offset. If TDS exceeds 44%, identify whether a co-borrower, larger down payment, or alternative lender is the solution.
2. Decide on title structure — parent alone, joint with child, or child alone with parent as guarantor — before the offer is written. Each structure has different mortgage qualification, PRE, and estate implications that cannot be easily unwound post-closing.
3. Consult a tax advisor on the PRE strategy before closing. If the child will be added to title and ordinarily inhabits the property, document the arrangement to support a future PRE designation on the child's share.
4. If the child will pay any rent, set it at market rate or zero — not an intermediate amount. Market rent creates a proper rental relationship with full deductibility of carrying costs; zero rent is clean personal use. Below-market rent creates CRA exposure with no offsetting benefit.
5. Source the down payment cleanly: if it is a gift from the parent to the child (who takes title), prepare a signed gift letter confirming no repayment obligation. If it is a loan, document it at the CRA prescribed rate to avoid attribution.
6. Engage a broker with access to Schedule A banks, monolines, and alternative lenders simultaneously. The binding constraint on this file type is almost always TDS, and the lender with the most favourable family-use rental credit policy can materially change the outcome.

## Sources
- 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
- Mortgage Loan Insurance — Homeownership — https://www.cmhc-schl.gc.ca/professionals/project-funding-and-mortgage-financing/mortgage-loan-insurance/mortgage-loan-insurance-homeownership-programs
- Principal Residence Exemption — https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-return/completing-a-tax-return/personal-income/line-12700-capital-gains/principal-residence-other-real-estate/principal-residence.html
- Rental Income — Guide T4036 — https://www.canada.ca/en/revenue-agency/services/forms-publications/publications/t4036.html
- Mortgage — Key Features and Costs — https://www.fcac-acfc.gc.ca/Eng/financial-literacy/life-events/buying-home/Pages/mortgage.aspx