First vs. Second Mortgage: How Priority Works in Ontario

If you have more than one mortgage on your Ontario property — say, an original purchase mortgage plus a home equity line of credit, or a bank mortgage plus a vendor take-back — you've probably heard them described as your "first mortgage" and "second mortgage." It's tempting to assume this just refers to which one you got first in time, or which one is bigger. It's neither. It refers to priority, and priority is a legal concept with real consequences if the property is ever sold, refinanced, or enforced against.

What "First" and "Second" Actually Mean

A property can have multiple mortgages (or "charges," the more formal term) registered against it at the same time. Each one is registered on a specific date, and that registration order — not the loan amount, not which lender is more prominent, not which one the borrower thinks of as "the main one" — determines priority:

• The first mortgage is the one registered earliest against the property.
• A second mortgage is registered after the first, and ranks behind it.
• A property can, in principle, have a third, fourth, or further mortgage, each ranking behind the one before it in registration order.

Why Priority Matters: Who Gets Paid First

Priority becomes concretely important any time the property is sold — whether voluntarily by the owner or through a lender's enforcement remedies, such as a power of sale. Proceeds from a sale are distributed according to registered priority:

If a sale doesn't generate enough to cover every mortgage in full, lower-priority lenders absorb the shortfall first — the second mortgagee is far more exposed to a shortfall than the first mortgagee, since it only gets what's left over.

Why Second Mortgages Carry More Risk (and Often Different Terms)

Because a second-position lender is paid only after the first mortgage is satisfied, second mortgages are inherently riskier for the lender. This is reflected in how second mortgages tend to be structured and offered compared to first mortgages — lenders taking second position are typically more selective and cautious about the risk they're accepting, precisely because their recovery depends on there being enough value left over after the first mortgage is paid.

This dynamic applies whether the second-position lender is a bank offering a HELOC, a private lender, or a vendor extending take-back financing as part of a sale.

Can Priority Be Changed? Postponement Agreements

Registration order sets the default priority, but it isn't always the final word. A postponement agreement is a legal document in which a mortgagee agrees to move its priority behind another charge, even though it might otherwise rank ahead based on registration date.

This comes up most often when:

• A homeowner refinances and takes out a new first mortgage, but an existing second charge (such as a HELOC) needs to formally step back into second position behind the new first mortgage.
• A lender registering a new charge requires an existing lender to confirm, in writing, that its priority position will remain where the parties intend.

Without a postponement agreement in these situations, the technical registration order could produce a result no one actually intended — which is exactly the kind of gap a lawyer reviewing the transaction is meant to catch.

Refinancing Complications Tied to Priority

Refinancing a first mortgage while a second mortgage remains on title is one of the more common places priority issues surface in practice:

• The new first-mortgage lender will typically want the old first mortgage discharged and its own mortgage registered in first position.
• The existing second-mortgage lender needs to either remain in second position behind the new first mortgage (often requiring a postponement agreement) or be paid out and discharged as part of the refinance.
• Timing and coordination between the old lender, the new lender, and any second-position lender all matter — gaps here can delay or derail a closing.

What This Means for Borrowers Considering a Second Mortgage or HELOC

• Understand that a second-position charge is genuinely a different risk profile than a first mortgage, both for you and for the lender extending it.
• Ask how a future refinance of your first mortgage would be handled, and whether a postponement agreement would be needed.
• Don't assume that paying down your first mortgage automatically "promotes" a second mortgage to first position — priority is about registration order, not loan balance.

Frequently asked questions