The Quick Read: A home equity line sits behind your first mortgage as a separate second-lien loan, so the first mortgage keeps its term and payment while the line adds a second obligation; the lenders that write one on a rental are a smaller group than on a home, and the right fit depends on occupancy, credit profile, and combined leverage.
- The first mortgage stays in place, but its balance still counts in combined leverage, and its payment still counts in debt-to-income.
- On an investment property, the network ceiling is 70% combined loan-to-value (CLTV), with a 700 minimum credit score and a $500,000 maximum line.
- Primary-residence and second-home lines can reach 90% CLTV, but only at a 720-or-better credit profile.
- Title must sit with the individual borrower or a revocable living trust. An LLC cannot hold title on these lines.
- A broker that shops several wholesale lenders can match the file to the program. Lendmire is a broker, never the lender.
What Does a HELOC Do to the Mortgage You Already Have?
Nothing. A home equity line of credit is a separate loan recorded behind your first mortgage. The first loan keeps its balance, term, and payment schedule. You simply add a second lien with its own payment.
How large a line the equity supports.
An equity line is sized by combined loan-to-value, occupancy, and credit — not by rental coverage. Switch the occupancy or the credit band and the ceiling moves with it.
Investment-property lines require a 700 minimum credit score; second-home lines start at a 640 minimum and primary-residence lines at 600, and the combined-LTV ceiling steps down as the credit band drops on primary-residence and second-home lines and holds on investment-property lines; the line cap steps down on primary-residence lines and holds at every tier on investment-property and second-home lines.
A debt-to-income ratio above 45% requires 680+ credit. Profiles under 640 are limited to single-family homes. At least 75% of the approved line is drawn at closing. Ceilings, floors, and caps update from Lendmire’s centralized guideline source.
Line estimate
Illustrative estimate only — not a quote, Loan Estimate, approval, or commitment to lend. The rate is an editable assumption; equity-line pricing is variable through both the draw and repayment periods and never converts to fixed. Occupancy and credit drive the ceiling together: an investment property tops out at 70% combined LTV (minimum credit 700, line cap $500,000); a second home tops out at 90% combined LTV (minimum credit 640, line cap $500,000), with the ceiling stepping down as the credit band drops (the cap holds at every tier); a primary residence tops out at 90% combined LTV (minimum credit 600), and its $750,000 maximum line is available only at 75% combined LTV or below with a 700-or-better credit profile (720 on the longer-runway program) and a full appraisal. Lines above $500,000 require a full appraisal. Credit, debt-to-income, property type, and full underwriting review all affect the final line.
The CFPB describes a HELOC as an open-end line you can borrow against repeatedly. Your equity is the home’s value minus what you owe. During a draw period you borrow up to the limit, and a repayment period follows.
This is why investors with an older, cheaper first mortgage look at lines instead of refinancing. A refinance replaces the first loan. A second-position line does not touch it.
One caveat matters up front. A line in first position replaces the mortgage, which defeats the purpose here. The rest of this article assumes second position behind a first mortgage you want to keep.
How Do Lenders Underwrite a HELOC Behind a First Mortgage?
Lenders underwrite the borrower first and the property second. The file turns on credit, debt-to-income, and combined leverage. Rent is not the deciding number, which is the sharpest contrast with a DSCR loan. The steps run in this order.
1. Value the property. Lines at or below $500,000 ordinarily use an automated valuation instead of a traditional appraisal. A full appraisal is required on any line above $500,000, and a borrower may request one at any size.
2. Add up every lien. CLTV is the first mortgage balance, plus any other liens, plus the new line, divided by value.
3. Apply the ceiling and subtract. Maximum line equals value times the CLTV cap, minus existing liens. A program dollar cap can bind first.
4. Check credit. The programs use a single-bureau score keyed to the primary wage earner. The report can be no more than 90 days old at closing, and rescores are not available.
5. Check debt-to-income. The maximum is 50%. It drops to 45% for credit profiles from 600 to 679, and a ratio above 45% needs a 680 minimum. The line is qualified on the interest-only payment calculated on the maximum draw.
6. Confirm title and property. Details on both come later.
The first mortgage’s rate does not change line size. Only its balance and payment matter.
A Worked Sizing Example
Run the numbers as percentages of value. Say a rental’s first mortgage balance equals 45% of its value. Against the 70% CLTV ceiling on an investment property, that leaves room for a line up to 25% of value. That is before the line-size cap, the credit floor, and debt-to-income are applied.
Now suppose a low valuation cuts the property’s value by 10%. The first mortgage balance now equals about 50% of the new value. Room under the same ceiling shrinks to about 20% of that value. The first loan did not move. The value did.
What Do Lenders Allow by Occupancy?
Ceilings depend on how the property is occupied, so no single figure applies to every borrower. Across the wholesale network Lendmire works with, the programs separate primary residences, second homes, and investment properties.
| Occupancy | Top CLTV and pairing | Credit floor | Max line |
|---|---|---|---|
| Investment property | 70% (700+ and 720+) | 700 | $500,000 |
| Second home | 90% only at 720+ | 640 | $500,000 |
| Primary residence | 90% only at 720+ | 600 | $500,000 at 90% CLTV; $750,000 at 75% CLTV, 700+ (720 on the longer-runway program) |
Lower credit tiers step the ceiling down. A primary residence at 640 tops out at 80% CLTV up to $500,000, for example, and a second home at 640 tops out at 75%. Any line above $500,000 is primary-residence only. It needs a credit profile of 700 or better (720 on the longer-runway structure, covered below), caps at 75% CLTV, and requires a full appraisal.
One more point on market figures. A BiggerPockets discussion of rental lines shows individual banks and credit unions quoting anywhere from 60% to 80% on rentals. Those are anecdotal, market-wide figures. On this network, an investment-property line stops at 70% CLTV.
What Structures Exist?
Two draw structures are available on primary residences and second homes. One is a 3-year interest-only draw with a 17-year fully amortizing repayment. The other is a 5-year interest-only draw with a 25-year repayment, which this article calls the longer-runway structure. Investment lines run the 5-year draw and 25-year repayment structure only.
Three features surprise people.
- Most of the line is drawn at closing. At least 75% of the line must be drawn on both structures. This is not an unused backstop. Most of the balance accrues interest from the start.
- Pricing floats. It floats through both the draw and the repayment period and never converts to fixed. The FTC notes that home equity lines typically carry variable pricing and that you pay only on what you borrow.
- Payments step up. The interest-only draw ends and amortization begins. Plan for the second payment to grow at that point.
Line sizes run from $25,000 to $750,000. After closing, the minimum subsequent draw is $1,000 on the structure that states one. A borrower can hold up to three lines, and an owner with more than 15 financed properties is not eligible.
Which Lender Types Write These Lines?
Lender type shapes what you can get. The pool for rentals is smaller and the limits are lower than for a home, a pattern NerdWallet attributes to lenders seeing higher default risk.
| Lender type | Typical approach to rentals | Best fit |
|---|---|---|
| Large retail lenders | Many decline rentals outright | Primary-home lines |
| Credit unions, portfolio lenders | Some write them, often locally | Members with local ties |
| Broker with wholesale network | Shops several programs, matches file | Investors needing options |
A broker cannot promise any lender’s appetite. What it can do is read your file against several sets of guidelines at once. The best program for your situation depends on occupancy, credit, the leverage you need, and how the property is titled. Lendmire arranges these lines in a set of 16 full-service states, narrower than its 41-market DSCR footprint, which includes Washington, D.C.
Where Does the General Rule Break?
The rule is that a second-position line leaves your first mortgage alone and is reviewed against your personal file rather than the property’s rent. Several situations break it.
The first mortgage already uses the cap. If the balance plus the new line would exceed the ceiling, there is no room. A low valuation shrinks the line while the first balance stays put.
The rental is held in an LLC. Title must sit with the individual borrower or a revocable living trust. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts cannot hold title. A property already deeded to an LLC needs a vesting change first. The other path is a DSCR cash-out refinance, subject to program terms.
You use a primary-home line to buy a rental. The collateral is your residence, not the rental. Your home then sits behind the investment. Read the line agreement as well, because terms can restrict renting out the home.
Your debt-to-income hits the wall before your equity does. An investor with many financed properties can run past the 50% ceiling with plenty of equity left. Every financed property’s payment counts.
The property type is not offered. Single-family, 2-4 units, PUDs, townhomes, and condominiums (including non-warrantable) are eligible. Manufactured homes, co-ops, condotels, log homes, commercial, mixed-use, and agricultural-zoned properties are not offered.
The line can be frozen. The FTC says a lender may freeze or reduce a line if the home’s value falls significantly or the borrower’s finances materially change. Do not count on a line as permanent funding for deals.
A recent bankruptcy is in the file. A bankruptcy needs four years of seasoning from discharge or dismissal. Housing history is reviewed across all financed properties.
Keep the First Mortgage or Replace It?
The honest answer is that it depends on what the old mortgage is worth to you. If the first mortgage is cheap, a second-position line preserves that. If your debt-to-income is stretched or the property is in an LLC, a DSCR cash-out may fit better. It replaces the first mortgage, so the old terms go away.
| Factor | Second-position line | DSCR cash-out refinance |
|---|---|---|
| First mortgage | Stays in place | Paid off and replaced |
| Reviewed on | Personal credit and DTI | Rental income covering the payment |
| Typical ceiling | 70% CLTV on investment | Around 75% LTV |
| Title | Individual or revocable trust | LLC possible, subject to lender program eligibility |
| Pricing | Floats, never fixed | Term structure varies by lender |
DSCR loans qualify primarily on property-level rental income covering the payment, subject to lender guidelines. Many select programs start at a 1.00 coverage ratio. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted. Cash-out refinances usually top out around 75% LTV with about six months of seasoning. A DSCR above 1.00 compares rent to the payment only, so it is not the same as positive cash flow. Lendmire’s complete DSCR loans guide covers the full structure.
Two more tests help. First, run the rental’s rent against both payments, the first mortgage and the line, and see whether the coverage ratio still holds. Second, ask what happens when the draw ends. If the plan depends on drawing the line down for the next purchase and refinancing it away later, check that the new property can carry its own debt on rent.
What Happens If You Refinance the First Mortgage Later?
A new first-mortgage lender will generally require the HELOC lender to agree to stay in second position. That agreement is called subordination. The HELOC lender is not obliged to agree, and some decline. If it does not, the line may have to be paid off or the refinance reworked.
Selling works differently. A sale generally requires paying the line off in full. Before you apply, read the first mortgage documents for any clause restricting a junior lien, and ask the line lender how subordination requests are handled.
What Should You Ask Before Choosing a Lender?
Use this short list.
- Does it write lines on rentals, and at what occupancy-specific ceiling?
- Is the line in second position behind my existing first mortgage?
- Is the valuation automated or a full appraisal, and who pays?
- How much must be drawn at closing, and when does the draw period end?
- How is debt-to-income calculated, and what happens to the payment at repayment?
- Will it agree to subordinate if I refinance the first mortgage later?
Red flags include a lender that cannot tell you its ceiling for your occupancy type, or one that quotes the highest leverage tier without naming the credit score it requires. Another is a line pitched as permanent funding with no mention of freeze or reduction terms.
Key Terms Defined
HELOC: A revolving line of credit secured by property, with a draw period followed by a repayment period.
CLTV: Combined loan-to-value, which is all liens on the property divided by its value.
Second lien: A loan recorded behind the first mortgage, paid in addition to it.
Draw period: The stretch when you can borrow from the line, usually paying interest only.
Repayment period: The later stretch when the balance amortizes and the payment steps up.
Debt-to-income (DTI): Your monthly debt obligations divided by gross monthly income.
Subordination: An agreement that lets a new first mortgage rank ahead of an existing line.
Next Steps
If you are considering a home equity line and want to see how the numbers work, Lendmire can help you compare HELOC options based on the property, the equity available, credit profile, combined leverage, and your goals. The brokerage’s walkthrough on how to qualify for an investment property HELOC when you want to keep your first mortgage is a good starting point, and the team can be reached at 828-256-2183. All figures are subject to lender guidelines and a full file review, and nothing here is a commitment to lend.
Frequently Asked Questions
Do I have to refinance to get a HELOC?
No. A line behind your first mortgage is a separate loan, so the first mortgage keeps its balance, term, and payment. A first-position line would replace the mortgage, which is the opposite of what this strategy aims for.
Will I make two payments?
Yes. You keep the first mortgage payment and add a payment on the line. During the draw period the line is typically interest-only, and the payment steps up when repayment begins. Test whether the rental’s rent covers both before you commit.
Can an LLC-owned rental get a HELOC on this network?
Not directly. Title must sit with the individual borrower or a revocable living trust, so a property deeded to an LLC needs a vesting change first. A DSCR cash-out is the usual alternative, subject to lender program eligibility.
How much can I borrow against a rental?
On an investment property, the ceiling is 70% CLTV, with a 700 minimum credit score and a $500,000 maximum line. Your actual line is the ceiling applied to value, minus your existing liens, then checked against credit and debt-to-income.
Is a HELOC always better than refinancing?
No. It tends to win when the first mortgage is cheap and your personal file is strong. It loses when debt-to-income is tight, the title is in an LLC, or the combined payments leave rent coverage thin. In those cases a DSCR cash-out may fit better.
About Lendmire
Lendmire (NMLS# 2371349) is a mortgage brokerage serving homeowners and real estate investors in its 16 full-service states. Home equity lines of credit are arranged through wholesale lending channels; Lendmire brokers the line and the lender underwrites each application under its occupancy-based guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
Get Started
Ready to find the right loan for you?
See your offer in seconds. No credit pull, no obligation.
Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
1. CFPB
2. BiggerPockets – HELOC on rental properties
3. FTC – Home equity loans and home equity lines of credit
4. NerdWallet
This article is part of Lendmire’s HELOC & home equity loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Best HELOC Program When You Want to Keep Your First Mortgage · Top HELOC Providers When You Want to Keep Your First Mortgage · Banks That Offer a HELOC When You Want to Keep Your First Mortgage · HELOC for Homeowners Who Want to Keep Their Low First Mortgage · HELOC vs Home Equity Loan for Homeowners Who Want to Keep Their Low First Mortgage
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
- North Carolina Real Estate Broker · License# 343312 · Verify on NCREC
- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Compliance and disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage broker and is not a direct lender, depository institution, financial advisor, or tax professional. Content in this article is general market analysis and educational information — not financial, legal, or tax advice for any specific situation. Lendmire does not guarantee loan approval; every transaction is subject to underwriting by the funding lender. Mortgage pricing and loan program guidelines are subject to change at any time without notice and vary by borrower characteristics, property type, and state regulations. Lendmire complies with Equal Housing Opportunity. Licensure verification: NMLS Consumer Access.