A second mortgage gives you a lump sum at a fixed rate for a set term; a HELOC is a revolving line you draw from as needed at a variable rate. A HELOC is usually cheaper and more flexible but requires full income and credit qualification. A second mortgage is easier to get on equity alone, which matters if the bank has said no.
The core difference
| Second mortgage | HELOC | |
|---|---|---|
| How you receive it | Lump sum | Draw as needed, like a credit card |
| Rate | Usually fixed for the term | Usually variable (prime + margin) |
| Cost | Higher | Lower |
| Qualification | Mainly equity and property | Full income and credit |
| Term | Short, often 1–2 years | Revolving, open-ended |
| Best for | A defined one-time need; borrowers the bank declined | Ongoing or uncertain needs; strong qualifiers |
| Main risk | Cost; renewal not guaranteed | Rate can rise; lender can reduce or freeze the limit |
When a HELOC is the better choice
If you qualify on income and credit, and your need is ongoing or uncertain — a renovation drawn in stages, a cash-flow buffer, tuition over several years — a HELOC is usually cheaper and more flexible. You pay interest only on what you actually draw.
When a second mortgage is the better choice
If the bank has declined you, if your income is hard to document, or if you need a defined lump sum now, a second mortgage is often the realistic option. It’s assessed mainly on your equity and the property, so it’s available in situations where a HELOC isn’t. You pay more for that accessibility.
It also suits a one-time need with a clear end — consolidating a fixed debt, clearing arrears — where a revolving facility would be more temptation than help.
A point people miss about HELOCs
A HELOC limit can be reduced or frozen by the lender, particularly if property values fall or your circumstances change. The money you were counting on may not be there when you reach for it. A second mortgage, once funded, is funded. For someone borrowing against a specific plan, that certainty can matter.
Frequently asked questions
Can I get a HELOC with bad credit?
Generally no — HELOCs require full qualification. This is often exactly why homeowners turn to a second mortgage instead, which leans on equity rather than credit.
Is a HELOC a type of second mortgage?
A HELOC registered behind your first mortgage is technically in second position, so the terms overlap. In everyday use, “second mortgage” usually means a fixed-term lump sum and “HELOC” means the revolving line. The practical differences above are what matter.
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This page is general education about mortgage options in Ontario. It is not legal, accounting, tax or insolvency advice, and it is not an offer of credit. Please seek independent professional advice for your own situation.