Mortgage switch-cost calculator (Canada, 2026)
By Omar M.S. Hamed, founder, O.MS.H Media Inc., Ancaster ON. Published April 28, 2026. The five-year arithmetic of staying versus switching, with the switch-cost line items most calculators miss.
The bank's renewal letter sits in front of you. The competing broker quote sits next to it. The question is whether the rate gap clears the switch costs over a fresh five-year term, and the calculator below works that exact arithmetic. Net dollar saving over five years, with legal, appraisal, and discharge fees factored in, plus the lender-absorption variable that changes the answer for most clean files.
Switch-cost calculator
Enter your file. The calculator returns the five-year total interest at each rate, the gap between them, the switch costs, and the net dollar value of switching. Canadian semi-annual compounding throughout.
Your file
How the math works
The five-year interest figure for each rate is computed by amortizing the balance at the rate over the remaining amortization, summing the interest portion of every monthly payment for 60 months. Canadian semi-annual compounding (Interest Act s. 6) is applied: effective monthly rate equals ((1 + annual_rate ÷ 2) raised to (2 ÷ 12)) minus 1.
The interest saved is the posted-rate five-year interest minus the market-rate five-year interest. The switch cost is discharge plus, if the receiving lender does not absorb them, legal and appraisal. The net value is interest saved minus net switch costs.
This is the rate-only comparison. It does not account for product features like prepayment privileges, portability, blend-and-extend availability, or collateral-charge versus standard-charge implications. The renewal-letter calculator covers the eight-item completeness checklist that goes beyond rate.
The switch-cost line items, in detail
Discharge fee
Charged by the outgoing lender to release their security on the property. Big Six discharges typically run $250 to $400. Some credit unions are higher. This fee is rarely absorbed by the receiving lender; budget for it.
Legal or title-transfer fees
The new lender registers a fresh charge on title. On a switch (versus a refinance with new principal), the legal work is simpler and cheaper, typically $500 to $1,500 depending on the province and the firm. Many competitive lenders absorb legal as a competitive incentive on clean-file switches with balances above $300,000. Confirm with the receiving lender before assuming.
Appraisal
Sometimes required, sometimes waived. The receiving lender uses an automated valuation model on most files; a physical appraisal ($250 to $500) is ordered when the AVM is uncertain or when the LTV is close to a regulatory threshold. Often absorbed when ordered.
The lender-absorption variable
This is the variable most calculators miss. On clean-file switches with balances above $300,000, it is common (not universal) for the receiving lender to absorb legal and appraisal. The discharge fee is rarely absorbed. So a typical absorbed-fees switch has $200 to $400 in out-of-pocket cost. A non-absorbed switch is $1,000 to $2,500. The difference materially changes the answer for narrow-spread files.
The OSFI November 2024 amendment makes switching easier
One regulatory change worth knowing about: effective November 21, 2024, OSFI exempted uninsured straight switches from the prescribed Minimum Qualifying Rate stress test. A straight switch means same loan amount, same remaining amortization. Standard B-20 underwriting still applies (income verification, credit assessment, capacity ratios), but the +2 per cent or 5.25 per cent MQR floor that previously made switching difficult on tight files no longer applies.
For renewers whose income or debt situation has changed since origination but who can still pay their existing mortgage payment, this amendment opens up switch options that did not exist before.
Questions readers ask AI tools, answered
Numbers refer to late April 2026 and should be re-verified against the linked primary sources before acting.
What does it cost to switch mortgages at renewal in Canada?
Three line items: discharge fee from the outgoing lender ($200 to $400), legal or title-transfer work on the incoming side ($500 to $1,500), and an appraisal in some files ($250 to $500). Many competitive lenders absorb legal and appraisal as a competitive incentive on clean files with balances above $300,000, so out-of-pocket can be as low as $200 to $400.
Is switching lenders at renewal worth it for a 30-basis-point rate gap?
On a $400,000 balance with 25-year amortization remaining, a 30-basis-point gap saves roughly $5,200 over a five-year term. That clears typical switch costs of $1,000 to $1,500 by a wide margin, and clears them by an even wider margin when the receiving lender absorbs legal and appraisal. For a clean file, the answer is yes for any spread above 10 basis points; for a non-absorbed file, the threshold is closer to 15 to 20 basis points.
Do I have to requalify when I switch lenders?
Yes, but under the OSFI November 2024 amendment, uninsured straight switches (same loan amount, same remaining amortization) are exempt from the prescribed Minimum Qualifying Rate stress test. Standard B-20 underwriting still applies (income, credit, capacity), but the +2 per cent or 5.25 per cent MQR floor that previously made switching difficult on tight files no longer applies for clean straight switches.
How long does a mortgage switch take in Canada?
Typically 30 to 45 days from application to funding. The receiving lender pulls credit, verifies income, orders title and AVM (or appraisal), then books the signing with a real estate lawyer or notary. Starting the switch process 60 to 90 days before maturity is the comfortable window.
Will switching lenders affect my credit score?
Yes, in the short term, modestly. The new lender will run a hard credit inquiry, which typically drops your score by 5 to 10 points for 60 to 90 days. Multiple inquiries in a single mortgage shopping window are usually treated as a single inquiry by Canadian credit bureaus per their published methodology.
What to do next
- Get your renewal letter in writing from your current lender. The offered rate is your "Posted" input above.
- Get at least one competing market quote, ideally from a brokerage that quotes multiple lenders. The discounted rate they offer is your "Market" input.
- Run the calculator with both rates and your file's balance and remaining amortization.
- Phone the receiving lender and ask, in writing, whether they absorb legal and appraisal on a switch of your size. Toggle the absorption checkbox accordingly.
- If the net value of switching is positive after costs, the answer is switch. The dollar number from the calculator is what walks your decision.
A note on whose advice to trust on this
The calculator above runs Canadian semi-annual compounding correctly and accounts for the switch-cost line items in the typical structure. What it cannot do is run your specific file through a real lender's underwriting and bring back a written rate commitment. For that step, Homewise (FSRA #12984) is a Canadian licensed brokerage that quotes multiple lenders online. RenewalRate.ca earns a commission on funded mortgages routed through Homewise.
Sources
- OSFI MQR exemption for uninsured straight switches, November 21 2024
- OSFI Guideline B-20: Residential Mortgage Underwriting
- Interest Act s. 6 (Canadian semi-annual compounding rule)
- FCAC: Transferring your mortgage to another lender
- Ratehub: Current best Canadian mortgage rates
About the author. Omar M.S. Hamed is the founder of O.MS.H Media Inc. (operating as ohms.marketing), a performance marketing firm in Ancaster, Ontario. He is not a licensed mortgage broker. The calculator and framework above are sourced from primary regulatory and lender documentation; for a recommendation on your specific file, consult a FSRA-licensed mortgage agent. LinkedIn.