How Much Equity Do I Need to Refinance?

OSFI states that the legal maximum LTV for uninsured mortgages at federally regulated institutions is currently 80%. In a straightforward conventional refinance, that means the new secured mortgage generally cannot exceed 80% of the lender-accepted property value.

So the homeowner retains at least 20% of that accepted value outside the mortgage. But 20% gross equity usually produces little or no cash-out room because the existing mortgage already occupies nearly the entire permitted borrowing amount.

A useful first-pass calculation is: maximum new mortgage = lender-accepted value × maximum permitted LTV. Then: gross refinance room = maximum new mortgage − all secured debts being paid out. Finally: net cash proceeds = gross refinance room − mortgage penalty − legal/appraisal/discharge costs − any other amounts paid from closing proceeds.

That sequence explains why homeowners often overestimate accessible equity by calculating property value minus current mortgage balance.

Assume the lender accepts a property value of $1,000,000 and the standard 80% refinance ceiling. Maximum new secured debt is $800,000. If the existing mortgage payout is $650,000, there is $150,000 of gross room before transaction costs.

If the break penalty is $10,000 and legal, appraisal and discharge costs total another illustrative $5,000, the estimated net cash before other adjustments is $135,000. The homeowner started with $350,000 of gross equity but could not access all $350,000 because $200,000 of value remains outside the maximum mortgage and $15,000 is consumed by costs.

Using the same example, if the lender accepts $950,000 rather than $1,000,000, the 80% ceiling falls to $760,000. After the same $650,000 mortgage payout, gross room falls from $150,000 to $110,000. After $15,000 of illustrative costs, net cash falls to roughly $95,000.

This is why “my home is worth about $1 million” is not a completed refinance calculation. The lender’s accepted value is the denominator that controls LTV.

A borrower with a $1 million home and no mortgage has enormous gross equity, but a bank does not automatically lend $800,000. The borrower still needs to satisfy the lender’s qualification, including current income, debts, credit and the applicable stress-test framework.

Accessible equity is therefore the lower of property capacity and credit capacity, minus costs. This is particularly important for retirees, newly self-employed borrowers and households whose income has fallen since the original mortgage was obtained.

The existing first mortgage is not the only balance that matters. A HELOC, second mortgage, secured line, tax lien or other registered claim may have to be included, paid out or otherwise dealt with. The relevant figure is the complete secured structure and the lender’s required payouts.

A homeowner with a $600,000 first mortgage and a $150,000 HELOC balance against a $1 million home already has $750,000 of current secured debt. At an 80% ceiling, only $50,000 of theoretical room remains before costs.

If a home is worth $1,000,000 and the existing secured payout is already $800,000, the homeowner has $200,000 of gross equity—20%—but zero room under an 80% refinance ceiling before costs. The refinance might still be possible as a rate/term restructure if the required amount fits, but it does not create equity takeout.

To receive meaningful cash, the homeowner generally needs the current secured balance to be below the maximum allowed new mortgage by more than the penalty and transaction costs.

Ordinary cash-out refinancing through federally regulated uninsured lending is generally governed by the 80% maximum. But specialty programs can create exceptions for defined purposes. CMHC currently offers an insured refinance program for eligible secondary-suite construction that can permit financing beyond ordinary cash-out limits, subject to its specific criteria.

That does not mean general consumer cash-out can be insured to the same level. The exception exists because the transaction purpose and program rules are different.

Non-bank, credit-union, alternative and private lending should not be collapsed into one universal 80% refinance statement. Some lenders operate under different regulatory frameworks or choose lower internal leverage limits; private lenders may set their own maximum LTV or CLTV based on property, mortgage position, borrower circumstances, exit and risk appetite. Some private structures can therefore exceed the mainstream federally regulated 80% ceiling, but that is lender-specific rather than a general entitlement.

The borrower-facing answer should therefore state the standard institutional rule first, then identify lender-specific or specialty pathways as separate categories rather than implying guaranteed access above 80%.

Taking the full amount available can increase payment, total interest and vulnerability to a future property-value decline. If the goal is to repay $40,000 of expensive debt, borrowing an additional $150,000 simply because equity exists may weaken rather than improve the balance sheet.

The suitable amount begins with the purpose and ends with the repayment plan. Maximum equity is a ceiling; required equity is a transaction input; suitable equity use is a financial decision.