Second Mortgage vs Home Equity Loan: The Difference
Key takeaways
- A second mortgage describes lien position; a home equity loan describes a lump-sum product.
- A home equity loan or HELOC is a second mortgage when it sits behind a first mortgage.
- Per secondary sources, the second lender is paid after the first lender if sale proceeds fall short; state law varies.
- Second mortgages generally carry higher rates relative to the first mortgage, but not in every case.
- A piggyback loan is a second loan originated alongside the first mortgage.
In the second mortgage vs home equity loan question, the two terms describe different things: "second mortgage" describes lien position, a junior lien that sits behind an existing mortgage, while "home equity loan" describes a lump-sum product. A home equity loan, and a home equity line of credit, become second mortgages when they are taken out behind a first mortgage.
That is why the words are often used interchangeably, and why they can mislead. This guide separates the terms, shows how lien priority works with a fictional example, explains standalone second mortgages and piggyback loans, and asks whether a second mortgage costs more. It is general information, not legal or financial advice, and priority rules can vary by state and situation.
Quick answer: one describes position, the other a product
A second mortgage is defined by where it ranks. The Mortgage Reports (31 August 2026) puts it plainly: a second mortgage refers to lien position. A home equity loan, by contrast, is a loan secured by your home that pays out as a lump sum. Per the Consumer Financial Protection Bureau (CFPB), a home equity loan is typically a fixed-rate lump sum, and if you cannot pay it back the lender could foreclose.
The overlap comes from timing. If you already have a mortgage and add a home equity loan, the new loan sits behind the existing one, so it is a junior lien and therefore a second mortgage. If you own the property outright, The Mortgage Reports notes, the same loan can take first-lien position and is not a second mortgage at all. Wikipedia likewise describes second mortgages as commonly junior liens that can be structured either as a home equity loan or as a home equity line of credit.
The CFPB's HELOC booklet reflects this overlap by listing "second mortgage or home equity loan" together as one row in its table comparing ways to borrow against a home. We use that booklet for the product description only; it does not define lien priority.
A term map
These labels are easy to confuse because each answers a different question: how the loan is paid out, how the rate works, or where the lender ranks. The table below separates them.
| Term | Describes | Structure |
|---|---|---|
| Second mortgage | Lien position (a loan ranking behind a first mortgage) | Can be a lump-sum loan or a line of credit |
| Home equity loan | A product that disburses a lump sum | Typically fixed rate with equal payments that pay off the whole loan, per the CFPB booklet |
| Home equity line of credit | A product that works as an open-end line | Draw and then repayment; typically variable rate; the lender can freeze or reduce the line, per the CFPB |
| First mortgage | The senior lien, usually the original purchase or refinance loan | Paid first if the home is sold to satisfy debts |
| Junior lien | Any lien ranking behind a senior lien | A second mortgage is the most common example |
| Piggyback loan | A second loan taken at the same closing as the first mortgage | Originates alongside the first mortgage in one closing |
The CFPB booklet's comparison row for a second mortgage or home equity loan describes a loan that is generally based on a percentage of your home's appraised value minus what you owe on your mortgage, carries a fixed rate, and puts your home at risk. Its advantages and disadvantages are also useful: equal payments that pay off the entire loan, but a new loan is needed to borrow more, and repayment is often required when you sell your home.
For a head-to-head look at the two products, rather than the vocabulary, read our HELOC vs home equity loan comparison. We do not repeat that comparison here.
What lien priority means for you
A lien is a legal claim on property that secures a debt. Priority decides who is paid first if the property is sold because of a default, including in a foreclosure. According to Wikipedia, the second lender receives what remains after the first mortgage is paid in full. The Mortgage Reports says the same: the second-mortgage lender is paid after the first-mortgage lender if the sale proceeds are not enough.
You can model a fixed-rate second lien with our home equity loan calculator and see how a new payment sits on top of your first mortgage payment. The rule that the first lien is paid first is stated here as the secondary sources describe it; state law varies, and this page cannot tell you how priority works in your state. Ask a real estate attorney if the answer matters to a decision.
The table below is entirely fictional and uses round numbers to show the mechanics. It ignores sale costs, interest and fees, which would reduce what is left in a real sale.
| Item | Amount | Paid |
|---|---|---|
| Scenario 1: sale proceeds | $300,000 | n/a |
| First mortgage balance | $200,000 | $200,000 (paid in full first) |
| Second lien balance | $70,000 | $70,000 (paid in full second) |
| Left for the owner | $300,000 - $200,000 - $70,000 = $30,000 | $30,000 |
| Scenario 2: sale proceeds | $240,000 | n/a |
| First mortgage balance | $200,000 | $200,000 (paid in full first) |
| Second lien balance | $70,000 | $40,000 (what remains: $240,000 - $200,000) |
| Unpaid second lien balance | $70,000 - $40,000 = $30,000 | $0 |
In the first scenario everyone is paid and the owner keeps $30,000. In the second, the first lender is paid in full and the second lender takes the loss on the remainder. This is the core reason a second lender takes more risk, and it is why second mortgages are described as carrying higher rates relative to the first mortgage.
Standalone second mortgages vs piggyback loans
Not every second mortgage is a cash-out loan taken years after buying. A standalone second mortgage is taken out after the first mortgage already exists, usually to borrow against equity you have built. A piggyback loan is different: it originates at the same time as the first mortgage, in one closing. According to Wikipedia, it allows a buyer to avoid private mortgage insurance with a down payment of less than 20 percent.
The Mortgage Reports also separates a second mortgage from a cash-out refinance. A cash-out refinance replaces the first mortgage rather than adding a loan, so it does not create a second lien at all. If you are weighing those routes, the practical question is whether you want one loan or two, and whether your existing first mortgage terms are worth keeping.
A related structure is a first-lien HELOC, where the line itself takes first position; our guide on first-lien HELOCs explains that structure. Terminology can shift depending on whether another mortgage exists, so always ask a lender where your new loan will rank.
Does a second mortgage cost more?
Often, relative to the first mortgage, yes, but not always, and not by a fixed amount. Wikipedia states that second mortgages generally carry higher interest rates relative to the primary loan because of the higher risk, and The Mortgage Reports likewise notes second mortgages often have higher rates. That wording matters: it compares a second lien to the first mortgage on the same property, not to every other loan product on the market.
Several things shape what you will actually pay, and none of them can be reduced to a rule of thumb here:
- Combined loan-to-value ratio. Lenders generally look at all the debt secured by the home, first mortgage plus the new loan, relative to its value. Each lender sets its own limit.
- Upfront fees. The CFPB says to compare more than the monthly payment, including upfront fees and costs.
- Rate type. A home equity loan is typically fixed; a line of credit is typically variable.
- Your first mortgage. Keeping a low-rate first mortgage and adding a second loan can cost less than replacing both, or more; it depends on the numbers.
We give no current rates here and will not call a second mortgage more or less expensive in every case. Use real offers and a calculator to compare.
Which one fits your situation
Use the vocabulary to pick the right question. Ask "what kind of product?" when you need to decide between a lump sum and a line of credit. Ask "what lien position?" when you want to know your risk and how the new loan interacts with your first mortgage.
- You know the exact amount you need and want equal payments. A lump-sum home equity loan fits that description, and the booklet notes it pays off the entire loan with equal payments.
- You need money in stages or are unsure how much. A line of credit may fit better, but read the freeze and reduction terms.
- You are buying a home with less than 20 percent down. A piggyback structure is one of the options described, though it adds a second loan to track.
- You want to change your first mortgage anyway. A cash-out refinance replaces the first mortgage instead of adding a lien.
Before you sign anything, put these questions to each lender in writing so you can compare answers side by side:
- Where will this loan rank behind my existing first mortgage, and is it a junior lien?
- Is the rate fixed or variable, and does the payment pay off the whole balance or only the interest?
- What upfront fees and closing costs apply, and which are non-refundable?
- What happens to the loan if I sell the home? The CFPB booklet notes repayment is often required at sale.
- If I need more money later, do I have to apply for a new loan, as the booklet describes for a home equity loan?
Whichever you choose, the home is collateral. The CFPB HELOC booklet sets out the questions to ask any lender and the costs to compare. Model a fixed-rate second lien in the home equity loan calculator before you decide, and compare at least two written offers.
Frequently asked questions
Is a home equity loan a second mortgage?
Usually, when you already have a mortgage. The home equity loan then sits behind it as a junior lien. If you own the home outright, it can take first-lien position and is not a second mortgage.
Is a HELOC a second mortgage?
A HELOC is commonly a second mortgage when it ranks behind a first mortgage, but it is a line of credit product rather than a lump sum. The CFPB describes it as an open-end line that is typically variable rate.
What is a junior lien?
A junior lien is a claim on a property that ranks behind a senior lien, such as a first mortgage. A second mortgage is the most common example.
What is a piggyback loan?
A piggyback loan is a second loan that originates at the same closing as the first mortgage. According to Wikipedia, it lets a buyer avoid private mortgage insurance with a down payment under 20 percent.
Who gets paid first in foreclosure?
Generally the first-mortgage lender is paid first and the second lender receives what remains. Priority rules can vary by state, so this is not legal advice.
Run your own numbers free.
Open calculatorThis article is general information, not financial, tax or legal advice. Figures are approximate and change over time — always verify with a qualified professional or the official source before making a decision.
Written and reviewed by the HELOC Payment Calculator editorial team. Facts checked against primary sources; see the reference above.