The Quick Read: You keep your low first mortgage by borrowing against equity through a separate second-lien home equity line instead of refinancing, so the original loan keeps its balance, interest terms, and payoff schedule exactly as written, while the line’s cash becomes your down payment, rehab budget, or reserves for the rental.
- The line can sit on your primary home or on a rental you already own. On an investment property, the network’s ceiling is 70% combined loan-to-value (CLTV, which counts every loan against the property), with a 700 minimum credit score and a $500,000 maximum line.
- On a primary residence, the ceiling reaches 90% CLTV, and only at a 720-or-better credit profile.
- The DSCR loan on the new rental still has its own down payment, reserve, credit, and coverage tests. Borrowed money waives none of them.
- The line’s payment never enters the DSCR math. It sits on you personally.
- Pricing on the line floats and never converts to fixed, and at least 75% of the line is drawn at closing.
What “Keep Your First Mortgage” Actually Means
A home equity line of credit (HELOC) is a separate loan that sits behind your existing mortgage. It adds a second lien and leaves the first loan alone. A cash-out refinance does the opposite: it pays off the first loan and puts new terms on the whole replacement balance.
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.
That difference is the entire reason investors with a cheap first mortgage look at lines. Only the new money carries new pricing. The balance you already owe stays on the old terms.
| Feature | HELOC (second lien) | Cash-out refinance |
|---|---|---|
| Your first mortgage | Stays in place | Paid off and replaced |
| New terms apply to | Only the new borrowing | The entire new balance |
| Number of payments | Two | One |
| Underwritten on | You: credit, income, DTI, equity | Varies by program |
Keeping the first loan is not free, though. You trade one payment for two, and the second one floats. Lendmire, a mortgage broker that places these files with wholesale partners, sees investors weigh that tradeoff on nearly every equity file.
Key Terms Defined
CLTV (combined loan-to-value): Every loan secured by the property, added together and divided by its value.
Second lien: A loan that is repaid after the first mortgage if the property is ever sold or foreclosed on.
Draw period: The stretch when you can borrow from the line and pay interest only.
Repayment period: The stretch after the draw ends, when the balance amortizes and the payment steps up.
DSCR (debt service coverage ratio): Monthly rent divided by the monthly payment on the rental’s loan, covering principal, interest, taxes, insurance, and any HOA dues.
PITIA: Principal, interest, taxes, insurance, and association dues, the full monthly obligation on a property.
Subordination agreement: A lender’s written consent to stay in second position when the first mortgage is refinanced.
Seasoning: The waiting period a lender wants between events, such as owning a property and then pulling cash out of it.
Which Property Should Back the Line?
You have two choices, and they behave very differently. Most investors who ask this question have a primary home with a low first mortgage and plenty of equity. That makes the home the usual collateral. A rental you already own is possible, but the rules tighten.
| Factor | Line on your home | Line on a rental |
|---|---|---|
| Max CLTV | Up to 90% (720+ credit only) | 70% |
| Minimum credit | 600 program floor | 700 |
| Line size | $25,000 to $750,000 | Up to $500,000 |
| Draw structure | Two options | 5-year draw only |
| Main risk | Your residence is collateral | Rental income can fall short |
Leverage on a rental is the most restrictive tier. The 70% ceiling applies on an investment property at either 700 or 720 credit, so a higher score does not buy more leverage there. The 700 floor is firm, with no lower tier beneath it.
NerdWallet notes that lines on rentals are possible but come with a smaller lender pool and tighter limits than lines on a primary home. That matches what brokers see. Many large retail lenders write lines on a primary home and decline when the collateral is a rental.
The ownership structure matters just as much as the property. On this network, the borrower must hold title as an individual or in a revocable living trust. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts cannot hold title. A rental already deeded to an LLC needs a vesting change first, or a different tool.
How Underwriting Treats the Line, Step by Step
A HELOC is underwritten on you. A DSCR purchase loan is underwritten primarily on the rental’s income covering its payment, subject to lender guidelines. Approval on one does not guarantee approval on the other. Here is the sequence in practice.
1. Choose the collateral. Your home or an existing rental. Occupancy sets the credit floor and the leverage ceiling.
2. Size the line. Multiply the property’s value by the CLTV ceiling, then subtract every lien already on it. A small first-mortgage balance leaves more room. The first loan’s interest terms do not change the sizing.
3. Check your debt-to-income ratio (DTI). Maximum DTI is 50%. It drops to 45% for credit profiles from 600 to 679, and anything above 45% needs a 680 minimum. The qualifying payment is calculated on the interest-only payment at the maximum draw, so the test is stricter than your actual first-month payment.
4. Confirm the valuation path. Lines at or below $500,000 ordinarily use an automated valuation, though a higher CLTV may call for a second valuation. A full appraisal is required on any line above $500,000. An investment line caps at $500,000, so it commonly closes with no traditional appraisal.
5. Read your first-mortgage documents. Look for any covenant on adding liens. Treat this as a precaution, not a universal rule.
6. Draw and move the money. Keep the cash in a clean paper trail from the line to the closing table.
7. Run the purchase loan on its own terms. Down payment, reserves, credit, and coverage are all tested again for the rental.
The borrower profile has a few other limits. A borrower can hold at most three of these lines at once, and a borrower with more than 15 financed properties is not eligible. Eligible property types include single-family, 2-4 units, PUDs, townhomes, and condominiums, including non-warrantable ones. Manufactured homes, co-ops, condotels, log homes, commercial, mixed-use, and agricultural-zoned properties are not offered.
Availability is narrower than the DSCR side of the business. Lendmire’s DSCR programs span 41 markets, including Washington, D.C. Its home equity lines run in a smaller set of full-service states, so confirm availability before building a plan around one.
What the Line Looks Like Once It Closes
The structure is less flexible than the word “line” suggests. On an investment property, the network runs one structure: a 5-year interest-only draw followed by a 25-year fully amortizing repayment. On a primary residence, two structures exist: a 3-year draw with a 17-year repayment, and a 5-year draw with a 25-year repayment.
Two features surprise people. First, at least 75% of the line is drawn at closing. This is not a standby reserve you leave untouched. You pay on most of the money from the start. Second, pricing floats through both the draw and repayment periods and never converts to fixed.
Market-wide, NerdWallet reports a typical HELOC with a 10-year draw followed by repayment of up to about 20 years. The network’s investment line is shorter on the draw side and longer on the repayment side: 5 years and 25 years.
After closing, the minimum subsequent draw is generally $1,000 on lines with a stated minimum. Because most of the line is drawn at the start, this matters less than it sounds.
How the Purchase Lender Sees Borrowed Down-Payment Money
The purchase lender cares where your cash came from. A line draw is borrowed money, and lenders often review recent bank statements and ask about large deposits. Treatment of borrowed funds is program-specific, both for the down payment and for reserves.
Reserves are a separate test from the down payment. On many DSCR files, reserves run around 6 months of PITIA, though they vary by lender, leverage, loan size, and transaction type. Loans above $1,500,000 typically step up to about 9 months. Whether borrowed funds count toward reserves depends on the purchase lender, so confirm that before you draw.
DSCR purchase leverage on most files lands at 75% to 80% LTV, meaning 20% to 25% down. Select programs reach 85% LTV with about a 700 score or better. A larger down payment lowers the payment and can lift coverage. It never erases leverage caps, credit floors, reserve rules, or property eligibility.
Coverage is where select programs set their floor. Many start at 1.00, meaning rent equals PITIA. A separate select-lender path takes coverage below 1.00 with leverage and terms adjusted. Stronger ratios generally open better pricing and leverage.
Remember what the ratio measures. DSCR compares rent to PITIA only. Clearing 1.00 is not the same as positive cash flow, because repairs, vacancy, management, utilities, and capital expenses all sit outside it.
DSCR loans are designed for non-owner-occupied investment properties. Because they are business-purpose investor loans, they are reviewed differently from a standard owner-occupied mortgage. The line is the opposite: it is a consumer-style loan on you. That split explains why one approval does not carry over to the other. Lendmire’s complete DSCR loans guide covers the investor side of that split in full.
A Worked Example, in Ratios
Run the numbers on a homeowner whose primary residence carries a first mortgage equal to about 45% of its value. Say the borrower has a 720-plus credit profile. On a primary residence, the ceiling reaches 90% CLTV at that tier. Subtracting the 45% already owed leaves room for a line up to roughly 45% of the home’s value, subject to the line-size limits and DTI.
That is the ceiling, not a target. The owner wants a duplex and plans a DSCR purchase at 75% LTV, with the 25% down payment drawn from the line. These are modeled assumptions, not market data. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.
The purchase loan itself might clear around 1.2x coverage. That ratio counts only the duplex’s loan. The line’s payment is a second obligation that belongs to the borrower personally. The line is also qualified at its maximum-draw interest-only payment, which is the highest reasonable payment.
Look at the combined picture. Funding the entire down payment with borrowed money means the duplex is financed at close to 100%. The deal only works if rent holds up after vacancy and repairs, and if the borrower can cover both payments from other income. A healthy ratio can hide a thin personal cash position.
Here is the same deal with a smaller line. If the borrower funds half the down payment from savings, the line is smaller, the second payment is smaller, and the combined leverage falls. Pulling less is a legitimate way to keep the first mortgage and still sleep at night.
Where the General Rule Breaks
The idea sounds simple: add a second lien, leave the first alone. Several edge cases change that.
LLC title. If the rental sits in an LLC, a HELOC cannot attach to it. Your options are to change vesting into your name or a revocable trust, or to use a DSCR cash-out, which can lend to an entity subject to program terms. A cash-out replaces the first lien, so you lose the low first mortgage. Pulling cash that way tops out around 75% LTV on a standard rental, with about 6 months of seasoning as the common expectation. On a short-term rental, cash-out is capped at 70%. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.
Lien position. The network’s line can sit in first or second position. A first-lien line on a property that already has a mortgage pays that off. To keep the low first, you choose second position deliberately.
Refinancing the first later. The second-lien holder may need to be paid off or agree to stay behind the new loan. That agreement is the subordination agreement. Plan for this if you may refinance the first mortgage down the road.
Stacking. Adding a DSCR cash-out on a rental that already has a line raises combined leverage. A large cash-out can leave no room for the line, and the reverse is also true.
Prepayment terms on the DSCR side. Some DSCR loans carry prepayment penalties. A plan of using a line for the down payment and then quickly refinancing the new property may not pencil if those penalties apply. Read the purchase loan’s terms before you sequence anything.
Property or borrower exclusions. A rental in an ineligible property type is not offered. A borrower at the three-line limit or with more than 15 financed properties is out. A property listed for sale, or listed within the past 60 days, is ineligible in some states.
What Goes Wrong After Closing
The risk is not the first month. It is month 60, when the draw ends.
The CFPB’s HELOC booklet says variable-rate payments can change even if you draw nothing more. It adds that when the draw period ends, the lender may set a repayment schedule or require the balance all at once. It also warns that you could lose your home if you cannot repay.
That last point matters most when the line sits on your residence. A failed rental then puts your home behind the loan. Investors do this regularly, so it is not reckless by default. It does deserve an honest answer to whether you would still make both payments if the rental sat empty.
Stress-test three scenarios before you sign:
- Vacancy. Run both payments with the rental empty.
- Index movement. Raise the line’s payment and see whether your cash flow survives.
- End of draw. Model the step-up when interest-only turns to full amortization.
Tax treatment can depend on how the funds are used and how the property is held; investors should keep clear records and speak with a qualified tax professional before relying on any deduction.
When a HELOC Is the Wrong Tool
A line is not always the right fit, even with a cheap first mortgage. The genuinely close call is a small first-mortgage balance, where keeping the old terms saves less than the second payment costs. The decision looks different by borrower.
| Your situation | Likely better tool |
|---|---|
| Low first, large equity, home as collateral | HELOC on the home |
| Rental in an LLC | DSCR cash-out |
| Small first-mortgage balance | Cash-out or savings |
| Thin personal cash flow | Smaller line or wait |
| Large cash need above line limits | DSCR cash-out |
The broader decision of whether a HELOC is the right way to tap equity while keeping a low first mortgage comes down to the factors in the table above.
Frequently Asked Questions
Can I get a HELOC on a rental property?
Sometimes. On this network an investment line requires a 700 minimum credit score, caps at 70% CLTV, and tops out at a $500,000 line. Title must be in your name or a revocable trust. Many large retail lenders decline rentals as collateral, so the lender pool is smaller than for a primary home.
Does a HELOC change my first mortgage?
No. The line is a separate second lien, so the first loan keeps its balance, interest terms, and payoff schedule. The one future wrinkle is a refinance of the first, which may require a payoff of the line or a subordination agreement. Check your existing loan documents for lien covenants beforehand.
Does the HELOC payment count in my DSCR?
No. The DSCR counts only the rental’s own loan payment against its rent. The line’s payment sits on you personally and shows up in your DTI, which is qualified on the interest-only payment at maximum draw. A strong coverage ratio does not mean the combined cash flow is comfortable.
Can I use HELOC money for the down payment and reserves?
Often for the down payment, but it is program-specific, and reserves are a separate test. The DSCR lender may review where the funds came from, so confirm their rule before you draw. Borrowed money never waives leverage caps, credit floors, or property eligibility.
What if my rental is held in an LLC?
A HELOC cannot attach to it, because LLCs cannot hold title on these lines. You would change vesting to yourself or a revocable trust, or use a DSCR cash-out, which replaces your first mortgage. DSCR loans to entities are subject to program terms.
Next Step
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 site’s calculator offers an illustrative estimate to start from.
About Lendmire
Lendmire (NMLS# 2371349) is a mortgage broker that arranges DSCR investor loans and home equity lines through select wholesale lenders. Its DSCR programs reach 41 markets, including Washington, D.C. It is not the lender, and every figure is subject to lender guidelines and full file review. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
Investors who want the broader program framework can review how DSCR loans work.
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References
1. NerdWallet – Can You Get a HELOC on an Investment Property?
2. CFPB – What You Should Know About HELOCs
This article is part of Lendmire’s investment property HELOC program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Should a Landlord With a Low First Lien Use a Home HELOC? · Can a Condo Owner Keep a Low First Mortgage and Open a HELOC? · HELOC for Debt Consolidation Behind a Low First Mortgage
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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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.