The key rule to know.
Removing a co-signer changes who is on title and who is responsible for the debt. Because it's a material change to the borrower, Canadian lenders treat it as a refinance — not a straight switch. That means the November 2024 OSFI stress-test exemption does NOT apply. You must qualify under the full Minimum Qualifying Rate (contract rate + 2% or 5.25%, whichever is higher) on the remaining borrower's income alone.
Key Takeaways
- • Co-signer removal is treated as a refinance — full stress test requalification applies (MQR = contract rate + 2% or 5.25% floor, whichever is higher).
- • The November 2024 straight-switch exemption does NOT cover this — that exemption applies only to same-borrower switches.
- • Fair Market Value Appraisal is required: $300-$500.
- • Legal fees for retitling: $700-$1,500.
- • Most common scenario: parent who co-signed for their child 5 years ago, now removed because the child qualifies independently.
- • If you can't qualify alone, provincial credit unions are the best fallback — they're not bound by OSFI B-20 and may qualify at the contract rate.
Why Co-Signers Get Added in the First Place
Co-signers are added to mortgages to boost qualifying capacity. The three most common scenarios:
- First-time buyer with a parent co-signer: The young buyer has strong credit but insufficient income to qualify for the mortgage they need. A parent's income is added to the application to boost qualifying ratios. This is the most common co-signer scenario in Canada.
- Recent immigrant with a family co-signer: A new-to-Canada borrower without 2+ years of Canadian credit history may need a co-signer with established Canadian credit.
- Self-employed borrower with a salaried co-signer: A self-employed borrower whose declared income is lower than their true earnings may add a salaried co-signer to ease qualification.
In each case, the co-signer signs the mortgage as a fully liable borrower — they are jointly and severally responsible for the full mortgage balance, not just a portion of it. This is why co-signers eventually want off.
The Co-Signer Removal Process
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1. Gather income documentation for the remaining borrower
You'll need 2 years of T1 General tax returns with Notices of Assessment, recent pay stubs (last 30-90 days), an employment letter (dated, on letterhead), and — if self-employed — business financial statements. The remaining borrower is the one who must qualify the entire mortgage.
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2. Order a Fair Market Value Appraisal
The lender needs an independent appraisal ($300-$500) to confirm the current property value. This establishes the loan-to-value (LTV) for the refinanced mortgage. If your property has appreciated significantly, this can work in your favor — a lower LTV improves rate pricing and may avoid CMHC insurance requirements.
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3. Run the stress test on remaining borrower income
Your broker (or the lender's underwriter) calculates whether the remaining borrower's income supports the mortgage at the MQR. The key ratios are Gross Debt Service (GDS, typically max 39%) and Total Debt Service (TDS, typically max 44%). If these ratios work at the stress-test rate, approval is straightforward.
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4. Choose a lender and term
Since you're refinancing anyway, use the opportunity to shop rates across multiple lenders. Refinance rates are often 10-25 bps higher than pure-renewal rates, but a broker can identify the lender with the best refinance pricing for your profile. Compare prepayment privileges and penalties alongside rate.
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5. Retain a real estate lawyer for retitling
Removing a co-signer requires changing the registered mortgage and often the property title. A real estate lawyer handles the discharge of the old mortgage, registration of the new one, and any title changes. Lawyer fees: $700-$1,500 depending on complexity and province.
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6. Close the new mortgage before old mortgage matures
Coordinate timing so the new mortgage funds before the old mortgage's maturity date. This avoids auto-renewal at an uncompetitive rate with your existing lender — which would still include the co-signer.
What If You Can't Qualify Alone?
If the remaining borrower's income alone fails the stress test, you have four options:
Option A: Renew with co-signer for another term
Keep the co-signer on the mortgage for another 3-5 years and try again at the next renewal. Income typically grows over time; qualifying alone becomes easier. Discuss with the co-signer whether they're willing to stay on.
Option B: Switch to a provincial credit union
Provincial credit unions are not bound by OSFI B-20 and may qualify you at the contract rate rather than the stress-test rate. This is the single most common fallback when remaining borrower income is close to qualifying but doesn't quite pass the MQR. Brokers licensed in the relevant province can identify which credit unions are most flexible.
Option C: B-lender refinance
B-lenders (Home Trust, Equitable Bank, Haventree Bank) apply more flexible underwriting at a rate premium (typically 0.5-1.5% above A-rates). For borrowers whose income documentation is unusual (self-employed, contract workers), a B-lender may approve while A-lenders decline. Use a broker — B-lenders operate exclusively through the broker channel.
Option D: Sell the property
If none of the above work and the co-signer needs off, selling is the final option. This is most common in divorce scenarios where neither ex-spouse can qualify alone for the full mortgage. See our divorce renewal guide for the specific considerations in that scenario.
Example: Parent Removal on a $500K Ontario Mortgage
Priya, 32, Ontario. Mortgage balance $500K, property appraised at $680K (LTV ~74%). Her father co-signed her original 2021 mortgage when her income was $72K. Her income is now $118K (promotion + new role). Renewal is in 6 weeks.
Path chosen: (1) Broker ordered appraisal confirming $680K FMV; (2) ran stress test at 6.29% MQR (contract rate 4.29% + 2%) against $118K income — GDS/TDS ratios passed with margin to spare; (3) broker shopped refinance-rate quotes across three lenders, best being 4.34% from a monoline with fair IRD; (4) retained a real estate lawyer to discharge the old mortgage, register the new one in Priya's name only, and remove her father from title. Total closing costs: appraisal $450, legal $1,100, title insurance $250 = $1,800. The new-lender cash-back incentive covered $1,000. Net cost ~$800.
Costs Summary
| Cost Item | Typical Range | Notes |
|---|---|---|
| Fair Market Value Appraisal | $300-$500 | Required by lender to confirm current property value |
| Real estate lawyer | $700-$1,500 | Discharge, re-registration, title changes |
| Title insurance (if applicable) | $200-$350 | Often required by new lender |
| Discharge fee (old lender) | $200-$400 | Only if switching lenders |
| Total (typical) | $1,400-$2,750 | Cash-back incentives often cover $500-$1,500 |
Related Guides
Divorce & Mortgage Renewal
Renewing during or after a divorce — qualifying alone, buyout timing.
Spousal Buyout Program
Insured refinance up to 95% to buy out an ex-spouse.
Mortgage Refinance in Canada
When a full refinance beats a simple renewal — rules and costs.
Affordability Requalification Calculator
Re-test your borrowing capacity before switching lenders.
Switching Lenders at Renewal
How to change lenders at renewal — no stress test on straight switches.
Common-Law Partner Renewal
How common-law status affects title, liability, and renewal.