What refinancing means
Refinancing replaces or materially restructures existing secured financing.
A refinance may:
Replace the current lender
Increase or decrease the mortgage amount
Change the amortization
Consolidate debts
Access equity
Pay out a second mortgage or HELOC
Add or remove a borrower
Change ownership, subject to legal and lender review
Exit private or alternative financing
Fund renovations, business activity or investment
A refinance is underwritten as a current transaction. The lender reassesses the borrower, property, secured debts, use of funds and requested structure.
Common refinance objectives
| Objective | Underwriting question |
|---|---|
| Lower interest cost | Do the rate savings exceed the penalty and transaction costs? |
| Lower monthly payment | Is the reduction caused by lower cost or merely a longer amortization? |
| Debt consolidation | Will the debts actually be repaid and prevented from rebuilding? |
| Equity takeout | Is sufficient value, income and repayment capacity available? |
| CRA obligations | What amount is owed, what security or liens exist and what professional advice is required? |
| Renovations | Will funds be advanced at once or through a construction/improvement program? |
| Business or investment use | Can the borrower support the debt, and has tax treatment been reviewed? |
| Private-mortgage exit | Has the original qualification obstacle been corrected? |
| Borrower or ownership change | Do the remaining borrowers qualify, and what legal transfer is required? |
Maximum institutional refinance LTV
For a standard uninsured residential mortgage at a federally regulated institution, the legal maximum LTV is currently 80% of the lender-accepted property value. The lender may impose a lower limit based on borrower risk, property, location or product. OSFI also expects the LTV to be recalculated at every refinance using an appropriate current valuation.
Classification: Federal prudential and statutory framework applying to federally regulated residential lenders.
Material qualification: Provincially regulated credit unions, private lenders and other lenders may operate under different legal and policy frameworks. A private lender’s willingness to consider a particular LTV does not make that leverage affordable or suitable.
The 80% uninsured limit should not be confused with:
High-ratio insured purchase rules
The 65% revolving HELOC limit
Lower limits for non-conforming mortgages
Private-lender risk limits
Commercial mortgage LTV policies
Construction or bridge-financing structures
Refinance proceeds and transaction costs
The amount available is not simply 80% of value minus the current first mortgage.
The refinance must account for:
Existing mortgage payout
Prepayment penalty
HELOC and second-mortgage payout
Legal fees
Appraisal
Discharge charges
Lender fees
Brokerage fees where applicable
Tax or judgment payouts
Interest adjustments
Net cash required by the borrower
The final calculation should show both:
Gross new mortgage
Net funds available after all payouts and costs
The complete economic comparison
A refinance should compare:
Current balance and rate
Remaining term and amortization
Prepayment penalty
New rate and product
All transaction costs
New mortgage balance
New monthly payment
Remaining balance after a chosen comparison period
Total interest under comparable assumptions
Expected time the borrower will keep the property or mortgage
A lower payment is not automatically a lower cost.
Refinance break-even and the amortization-reset problem
Assumptions
Current mortgage balance: $500,000
Current rate: 6.40%
Remaining amortization: 18 years
Current monthly payment: $3,880.32
New rate: 5.10%
Penalty, legal, appraisal and discharge costs: $15,500
Costs are added to the new mortgage for illustration
New mortgage principal: $515,500
New amortization: 25 years
New monthly payment: $3,027.59
Rates remain unchanged solely for comparison
No additional prepayments
Variables
TC = Total transaction cost
CP = Current monthly payment
NP = New monthly payment
MS = Monthly cash-flow savings
BE = Simplified break-even period
Formula
Monthly cash-flow savings = Current monthly payment − New monthly payment
Break-even period = Total transaction cost ÷ Monthly cash-flow savings
Calculation
MS = $3,880.32 − $3,027.59
MS = $852.73 per month
BE = $15,500 ÷ $852.73
BE = 18.2 months
Result under the simplified formula
The upfront costs appear to be recovered through payment savings after approximately 18 months.
That result is incomplete.
After five years:
Estimated balance if the original mortgage continued: $412,178
Estimated balance on the new 25-year mortgage: $456,970
Additional balance remaining under the refinance: approximately $44,792
The payment declined partly because repayment was stretched from 18 remaining years to 25 years.
Comparison if the 18-year amortization were preserved
At the same new rate and $515,500 principal, an 18-year amortization would produce a payment of approximately:
$3,637.13 per month
The monthly saving would be only:
$3,880.32 − $3,637.13 = $243.19
The estimated balance after five years would be approximately $415,468, much closer to the original mortgage trajectory.
Interpretation
The simple break-even formula is useful for cash-flow screening, but it ignores:
Amortization reset
Different remaining balances
Future renewal rates
Time value of money
Debt consolidated
Tax consequences
Behaviour after monthly payments fall
A suitable analysis should show both payment relief and the debt remaining.
Refinancing to consolidate debt
A refinance can replace higher-rate unsecured debt with lower-rate secured debt. That may improve monthly cash flow, but it also converts previously unsecured debt into debt secured against the home.
The borrower should understand:
The home is now security for the consolidated debt
Repayment may be extended over many more years
Repaid credit cards may be used again
A future sale or refinance must repay the larger mortgage
The apparent interest saving depends on repayment discipline
Debt consolidation receives fuller treatment in Chapter 27.
Refinancing to pay CRA obligations
CRA debt does not automatically require a private mortgage. The outcome may depend on:
Amount owing
Existing registration or lien
Current income
Equity
Credit
Tax-filing status
Payment arrangement
Lender policy
Legal priority
A mortgage professional can structure financing, but tax liability, deductibility and settlement advice belong to the appropriate tax professional or lawyer.
Business and investment use
The fact that borrowed funds are secured against a personal residence does not, by itself, determine whether the interest is deductible.
CRA’s published position generally requires tracing the use of borrowed money to an eligible income-earning purpose. Personal use is not converted into deductible use merely because the property securing the loan is an investment property, and business use is not automatically disqualified merely because a principal residence provides the security.
Classification: Federal tax issue.
Sources: Canada Revenue Agency Income Tax Folio S3-F6-C1 and current rental-expense guidance.
Material qualification: Deductibility is fact-specific and requires accounting or tax advice.
When refinancing may be a poor choice
A refinance may be unsuitable where:
Break costs exceed realistic savings
The borrower expects to sell shortly
A low-rate first mortgage would be unnecessarily replaced
A smaller HELOC or second mortgage is cheaper overall
The new payment is lower only because amortization is greatly extended
The borrower repeatedly rebuilds consolidated debt
Equity will be exhausted without solving the underlying problem
The proposed private-mortgage exit remains speculative
Sale or formal debt advice would be safer
Eligibility for additional debt does not establish that extracting the equity is suitable.
Aurora self-employed borrowers: private mortgage to A-lender refinance
A self-employed husband and wife in Aurora had remained in a high-interest private mortgage for almost two and a half years. They had been told that their low personal reported income made institutional financing impossible.
Our review examined:
T1 General income
Corporate financial statements
Corporate NIAT
Dividends already reported personally
Overall debt-service position
The policies of lenders willing to consider corporate income
Under the selected A lender’s policy, the file used the borrowers’ average personal income together with an eligible portion of corporate NIAT after adjusting for dividends already counted personally.
The private mortgage was refinanced with an A lender.
The key principle was not that corporate NIAT is universally accepted or that a fixed percentage applies across lenders. It was:
Before renewing or replacing an expensive private mortgage, the original qualification problem should be re-underwritten from the beginning.
The borrowers had not remained private because private lending was necessarily their only option. They remained private because the complete income structure had not previously been analyzed under the correct institutional policy.
If You Remember Only Three Things
A lower monthly payment may result from extending amortization rather than reducing true borrowing cost.
A standard federally regulated residential refinance is generally limited to 80% LTV, and individual lenders may lend less.
Every refinance should compare the penalty, fees, new balance, payment and remaining debt—not only the new rate.