- A second mortgage is exactly what it sounds like: an additional charge registered against your property, ranking behind your existing first mortgage in priority.
- A home equity line of credit is also typically registered as a separate charge behind your first mortgage, but it works differently in one important way: instead of receiving a lump sum,…
If you're a homeowner looking to access the equity built up in your property, you've likely run into three overlapping terms: a second mortgage, a home equity line of credit (HELOC), and a refinance. All three can put money in your hands using your home as security, but they are legally and structurally different products — and the differences matter well beyond the interest rate you're quoted.
This article compares how each is structured, what gets registered against your title, and how to think about which one fits your situation.
The Three Structures at a Glance
| Feature | Second Mortgage | HELOC | Refinance |
|---|---|---|---|
| What's registered | A new, separate charge behind your existing first mortgage | A separate charge securing a revolving credit line | Your existing mortgage is discharged and replaced with a new one |
| Existing first mortgage | Stays in place, untouched | Stays in place, untouched | Replaced entirely (or renegotiated with the same lender) |
| How funds are accessed | Typically a lump sum at closing | Draw and repay repeatedly, up to an approved limit | Typically a lump sum at closing |
| Priority on title | Ranks behind the first mortgage | Ranks behind the first mortgage | Becomes the (new) first-ranking charge |
| Number of registered charges after | Two: first mortgage + second mortgage | Two: first mortgage + HELOC charge | One: the new mortgage |
Second Mortgage: A Separate Charge Behind Your First
A second mortgage is exactly what it sounds like: an additional charge registered against your property, ranking behind your existing first mortgage in priority. Your original mortgage isn't touched — it continues on its own terms — and the second mortgage sits on top as a distinct debt with its own lender, its own terms, and its own registered priority.
Because a second mortgage ranks behind the first, the second lender takes on more risk than a first mortgage lender would (if the property is ever sold through a default process, the first mortgage gets paid out before the second). That risk position is a key reason second mortgages are structured, priced, and underwritten differently from first mortgages.
HELOC: A Revolving Charge, Not a Lump-Sum Loan
A home equity line of credit is also typically registered as a separate charge behind your first mortgage, but it works differently in one important way: instead of receiving a lump sum, you're approved for a credit limit and can draw funds, repay them, and draw again, similar to how a credit card works but secured against your home.
Some HELOC products are structured as "readvanceable" mortgages, where the available credit limit grows automatically as you pay down a linked mortgage component. The exact structure varies significantly by lender, so it's worth having your lawyer or the lender walk you through precisely what's being registered against your title in your specific product.
Refinance: Replacing (or Renegotiating) What's Already There
Refinancing means replacing your existing mortgage with a new one — either with the same lender or a different one — usually to access more equity, change your rate, or adjust your term. Unlike a second mortgage or HELOC, a refinance typically means your original mortgage is discharged from title and a single new mortgage is registered in its place, becoming the (new) first-ranking charge.
Because a refinance touches your existing first mortgage, it usually involves the same kind of process as an original purchase closing: a new mortgage commitment, a discharge of the old charge, and registration of the new one — with legal fees and disbursements on both sides of that transaction.
How to Think About Which One Fits
- If you want to keep your existing first mortgage's rate and term untouched and just need additional funds, a second mortgage or HELOC avoids disturbing that mortgage.
- If you need repeated, flexible access to funds over time rather than a single lump sum, a HELOC's revolving structure is built for that; a second mortgage or refinance typically isn't.
- If your existing mortgage's rate or term no longer makes sense for your situation anyway, a refinance lets you address that at the same time as accessing equity, rather than adding a separate charge on top of terms you'd want to change regardless.
- If you're weighing overall cost, compare the full picture — rate, any fees associated with breaking or amending your existing mortgage, and the legal costs of registering a new charge — rather than just the headline rate on the new product.
Because each structure has real legal and financial trade-offs, this is a decision worth discussing with both a mortgage professional (on the numbers) and a real estate lawyer (on what's actually being registered against your property) before committing.
Frequently asked questions
Can I have a second mortgage and a HELOC at the same time?
Potentially, depending on your equity position and what each lender is willing to accept given the other registered charges already on title. Each additional charge ranks behind the ones already registered, and lenders generally look at the combined loan-to-value across everything secured against the property.
Does refinancing always mean starting my mortgage term over?
Not necessarily — it depends on the product and lender, and on whether you're refinancing with your existing lender or switching lenders. This is a numbers-and-terms question worth confirming directly with your mortgage professional for your specific situation.
Is a second mortgage riskier than a HELOC?
They carry different types of risk rather than one being categorically riskier. A second mortgage is typically a fixed lump sum with its own repayment schedule; a HELOC's revolving nature means your balance (and required payments) can fluctuate based on how much you draw. Which is riskier for you depends on your spending discipline and cash flow.
Do I need a lawyer for a second mortgage or HELOC, not just a refinance?
Generally yes — registering any new charge against your title, including a second mortgage or HELOC, is a legal transaction involving title review and registration, similar in kind (though often smaller in scope) to a refinance closing.
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