On a $400,000 home with $220,000 left on the mortgage, a lender that caps combined borrowing at 85% will lend you, at most, $120,000 against it. Every second lender sizes a home equity loan that way, from the gap between a set share of the home’s value and what you already owe.
You can run that calculation yourself in a couple of minutes. Knowing the answer before you apply can save you an appraisal fee and a hard inquiry on an application that was never going to work.
Where a second lien sits
When you take out a mortgage, the lender records a lien against the property. If the home is ever sold or foreclosed, that lender is paid first. It holds the first position.
A second lien is a loan recorded behind it. The two common forms are a home equity line of credit (HELOC) and a home equity loan. Both are paid only after the first mortgage is paid in full. The FTC’s guide to home equity loans and lines of credit explains how each one works and what to compare.
That order explains almost everything about how second lenders behave. They are further back in line, so they care a great deal about how much value is left once the first lender is covered.
What is combined loan-to-value (CLTV)?
Second lenders work from combined loan-to-value, usually shortened to CLTV. It adds every loan secured by the home and divides the total by the home’s value.
Most lenders set a CLTV ceiling. For HELOCs and home equity loans in 2026 it commonly sits somewhere between 80% and 90%, depending on the lender, your credit and the property type. The slice above that ceiling is a cushion the lender keeps for itself in case prices fall.
Working out your borrowing room
Take a home appraised at $400,000 with $220,000 still owed on the first mortgage. The lender in this example caps CLTV at 85%.
- 85% of $400,000 is $340,000. That is the most all loans on the home can add up to.
- Subtract the $220,000 first mortgage balance.
- What remains, $120,000, is the largest second lien this lender could offer.
Your credit score never appeared in that math. Score and income still matter. They decide whether you are approved, the rate you pay, and sometimes a lower CLTV cap. But the ceiling itself comes from the property.
A case where that difference decided the outcome is in The Score Said No, the Property Said Yes.
Where your credit score comes in
The ceiling is the most a lender could offer. Whether you get near it depends on you. Many lenders only allow their highest CLTV above a certain credit score, and below it the cap can drop by 5 to 10 points. In the example above, that removes somewhere between $20,000 and $40,000 of room.
Debt-to-income matters too, because the new payment sits on top of everything you already pay each month. A home you live in usually gets a better cap than a rental. And a recent late payment on the first mortgage is one of the quickest ways to be turned down, whatever the numbers say.
The home value the lender uses
The value in the formula comes from the lender. Most lenders order an appraisal or use an automated valuation model. Online estimates are often higher than either.
If your own estimate says $450,000 and the appraisal says $400,000, the available room in our example drops by $42,500. It is worth running the math with a conservative number first.
Should you get a HELOC or a home equity loan?
Both sit in second position. The difference is in how the money arrives and how the payments work.
- HELOC. You draw what you need during a set draw period. The rate is usually variable, and payments are often interest only at first.
- Home equity loan. You receive one lump sum, usually at a fixed rate, and repay principal and interest from the first month.
Costs that arrive in stages, such as a renovation, fit a HELOC. For one known expense, where a steady payment matters more than flexibility, the lump sum is easier to plan around.
How much can a HELOC payment go up?
A HELOC payment can change twice: when the rate moves, and when the draw period ends. It helps to see both numbers in advance.
Take a $50,000 balance at 8.5%. During an interest-only draw period, the payment is about $354 a month. When the repayment period starts and the same balance is repaid over 20 years, the payment rises to about $434, even if the rate never changes.
If the rate rises by two points during that time, the repayment figure climbs again, to roughly $500. Run these numbers with your own balance before you sign. If the higher figure would strain your budget, borrow less or choose a fixed rate.
Risks that come with a second mortgage
Your home secures the loan, so falling behind can lead to foreclosure, the same as with a first mortgage. If the home’s value drops significantly, federal rules for home equity plans let a lender freeze the line or cut the limit. Selling means paying off both liens, and some refinances need the second lender to agree to stay behind the new loan. Then there is the jump from interest-only to full payments, which catches a lot of borrowers off guard.
None of this rules out a second lien. It does argue for borrowing less than the maximum and keeping some room spare.
Closing costs on a HELOC or home equity loan
Second liens carry closing costs of their own. Depending on the lender, these can include an appraisal, title search, recording fees and an origination charge. Some lenders waive part of this in exchange for keeping the line open for a minimum period.
On a small line, those costs can take a real share of what you borrow. Ask for the full fee list in writing before you agree to an appraisal.
When the home is your main residence, you also get a right to cancel a new home equity loan or line within three business days of closing, which gives you a short window to back out if the final terms are not what you expected.
When does a cash-out refinance make more sense?
A cash-out refinance replaces your first mortgage with a bigger one and hands you the difference. There is only one loan afterwards, and first-position rates are often lower than second-lien rates.
The trouble is that the new rate applies to the whole balance. If your current mortgage carries a low rate from a few years ago, refinancing all of it to reach a small amount of cash can cost far more over time than a separate second lien would. It usually makes sense only when the new rate is close to the old one, or when you need a large sum.
Five checks before you apply
- Current value. Use a conservative figure, not the highest online estimate.
- First mortgage balance. Take it from your latest statement.
- Combined limit. Ask each lender what CLTV cap applies to you.
- Closing costs. Get the full list before paying for an appraisal.
- Rate type. If the rate is variable, work out the payment at a rate two points higher.
If the math leaves very little room, a second lien is probably not the tool for this job, and a smaller personal loan or a cash-out refinance may be worth comparing.
Related reading
- The Score Said No, the Property Said Yes
- Which Mortgage Lenders Approve First-Time Buyers
- Debt-to-Income Ratio: The Number Behind Many Loan Declines
CLTV caps, appraisal rules and HELOC fees vary by lender and move with the housing market. Ask each lender for its cap and full fee list in writing, and read the HELOC disclosure or Loan Estimate before you sign.
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