The Quick Read: The home a first-lien HELOC down payment supports comes from two separate approvals. The line must clear equity limits and your debt-to-income test, and then the purchase must clear on rent coverage, leverage, credit, and reserves, with usable cash divided by the down-payment percentage setting the rough price ceiling. Only the line is tested against your personal debts. The purchase loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines.
- On an investment property, the network’s equity line tops out at 70% CLTV and $500,000, with a 700 credit minimum.
- The line is tested on the interest-only payment calculated on the maximum draw, not on what you plan to borrow.
- Price ceiling: usable cash divided by the down-payment percentage, after closing costs and reserves come out.
- A DSCR above 1.00 is not positive cash flow, and the line payment lands on top of it.
- Borrowed down-payment policy varies by lender, so ask before you draw.
Key Terms Defined
First-lien HELOC: a home equity line of credit in first position, meaning no other mortgage sits ahead of it. A line on a paid-off rental is first-lien by default.
DTI (debt-to-income ratio): your total monthly debt payments divided by your gross monthly income. For example, $3,000 of debt against $7,000 of income is 42.8%.
CLTV (combined loan-to-value): all loans on the property added together, divided by its value.
DSCR (debt service coverage ratio): monthly rent divided by the property’s full monthly obligation. That obligation is PITIA: principal, interest, taxes, insurance, and any association dues.
Draw period: the stretch when you can borrow from the line, usually interest-only, before repayment begins.
Reserves: liquid cash left after closing, usually counted in months of PITIA.
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.
Which First-Lien HELOC Does This Article Mean?
“First-lien HELOC” gets used two ways. Experian describes a line that replaces your existing mortgage and takes first position. Its illustration: a $500,000 home with $200,000 owed supports a $300,000 line, which pays off the old mortgage and leaves $100,000 to borrow.
The more common investor case is simpler. You own a rental free and clear, open a line against it, and use the draw as cash toward your next purchase. That is the version here, because it is where first-lien position, a down payment, and DTI all meet.
Two details matter before you plan around it:
- Title: The line must be held by you personally or by a revocable living trust. LLCs and corporations cannot hold it. A rental already deeded to an LLC needs a vesting change, or a DSCR cash-out refinance instead, subject to program terms.
- Availability: These lines are brokered through select wholesale partners in Lendmire’s 16 full-service states. That is narrower than the DSCR footprint of 41 markets, including Washington, D.C.
The Two Approvals (Plus One Nobody Tests)
Different underwriters answer different questions. Keep them apart, and the sizing gets easy.
| Test | Underwritten to | What limits it |
|---|---|---|
| The line | You: credit, equity, DTI | 70% CLTV, $500,000 cap, 50% DTI max |
| The purchase | The rental’s rent vs. PITIA | Typically 75%-80% LTV, reserves, credit |
| Your cash flow | Nobody, after closing | Your own budget |
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. That is why a heavy personal debt load is less likely to be the binding limit on the purchase itself. It is still the limit on the line.
How Does DTI Treat the Line?
DTI treats the line as a new monthly debt. Across the programs in this network, the maximum DTI is 50%, with 45% for credit profiles from 600 to 679. Anything above 45% needs a 680 minimum. Investment lines start at a 700 score, so the 50% ceiling is the one in play there, subject to lender guidelines.
Here is the part most borrowers miss. The line is qualified on the interest-only payment calculated on the maximum draw. If you are approved for a large line but plan to use a small slice, the test still assumes the full amount. At least 75% of the line is drawn at closing anyway. Pricing floats through both the draw and repayment periods and never converts to fixed.
You can back into the room your DTI leaves:
1. Multiply gross monthly income by the DTI cap. At 50%, that is half your income.
2. Subtract every existing monthly debt.
3. What remains is the most the tested line payment can use.
Say your existing debts already take 30% of gross income. At a 50% cap, the tested line payment can use up to 20%. A larger line means a larger tested payment, so that 20% caps the line.
A free-and-clear rental has no mortgage payment of its own, which helps. How a lender credits that property’s rent in your DTI varies, so ask before you assume it.
Sizing the Line From Equity
Equity is value minus what is owed. The CFPB’s HELOC booklet shows the arithmetic: a $100,000 appraised value at 75%, less a $40,000 balance, gives a $35,000 potential line. That example is illustrative only.
On this network, investment-property lines run 70% CLTV at a 700 score or better, capped at $500,000 total. There is no investment tier above that. On a free-and-clear rental, the whole 70% is available. If other liens exist, they eat into it first.
Lines of $500,000 or less ordinarily use automated valuation rather than a traditional appraisal. A higher CLTV may require a second valuation, and you can request a full appraisal at any time.
Primary-residence and second-home lines run higher, up to 90% CLTV at a 720 score.
From Draw to Purchase Price: The Step-by-Step Method
1. Take the smaller of two numbers. Compare the line your equity allows with the line your DTI allows. That is your real line.
2. Draw before you go under contract. Lenders trace the deposit through statements, and a deposit that appears at the last moment draws questions. How long funds must sit varies by lender.
3. Subtract closing costs and reserves. Reserves commonly run about 6 months of PITIA. They vary by lender, leverage, loan size, and transaction type.
4. Divide what is left by the down-payment percentage. This gives the rough price ceiling.
The division is where it gets concrete. Most DSCR purchases land at 75%-80% LTV, meaning 20%-25% down. At 25% down, the price ceiling is about four times your usable cash. At 20% down, it is about five times. Select programs reach 85% LTV (15% down) with roughly a 700+ score, which stretches the multiple to about 6.7 times. Final terms depend on lender guidelines, property type, leverage, and the borrower’s complete credit picture.
A larger down payment lowers the monthly payment and can lift the DSCR. It never erases leverage caps, credit floors, reserve rules, or property eligibility. The strongest files clear both tests: enough equity and enough rental coverage.
Which Limit Binds First: Equity or DTI?
Equity binds when the rental is modest in value, carries another lien, or the 70% CLTV runs out. DTI binds when your personal debts are heavy, which is common for investors who already hold several mortgages.
The $500,000 cap deserves its own mention. A very valuable rental still cannot produce a line above it. A borrower is also limited to three lines, and owning more than 15 financed properties makes you ineligible.
One call here is a toss-up. A big line on an equity-rich property feels like the obvious play. But a smaller line that leaves DTI headroom for the next purchase often serves a growing portfolio better. You trade a lower price ceiling today for room tomorrow.
Will the Purchase Lender Accept Borrowed Cash?
It depends on the program. Across the wholesale network Lendmire places files with, lenders fall into three camps. Some accept documented line proceeds. Some cap the borrowed share. Some require a slice of unborrowed cash.
Two patterns hold broadly. Secured sources such as a HELOC, second mortgage, or cash-out refinance are generally accepted, and an unsecured personal loan generally is not. And reserves are a separate pot: borrowed money may satisfy the down payment but not the reserve requirement.
Expect to supply the line’s closing documents, draw confirmation, and statements showing the cash landing. Sequence matters. Ask the purchase lender about borrowed funds before you draw, not after.
Where the General Rule Breaks
- LLC-owned rentals. The line cannot sit on a property titled in an LLC. DSCR purchases can sometimes close in an LLC, subject to program terms, but the line cannot.
- The draw period ends. Investment lines run a 5-year interest-only draw followed by a 25-year fully amortizing repayment. Payments step up when repayment begins. Model that for any multi-year hold.
- Replacing a cheap mortgage. Experian lists this as riskier than a traditional mortgage because of variable pricing and the revolving structure. Swapping a stable payment for a floating one is a real trade.
- The “DSCR HELOC” nickname. It is not a standard product. Rent-qualified versions are usually closed-end seconds or cash-out refinances. A true revolving line is underwritten on personal credit, debt, and equity.
- Property types. Manufactured homes, co-ops, condotels, log homes, commercial, mixed-use, and agricultural-zoned properties are not eligible for the line. Manufactured homes, log homes, and barndominiums are also not offered in the network’s DSCR programs.
- The alternative. A DSCR cash-out refinance tops out around 75% LTV on standard rentals, with about 6 months of seasoning as the common expectation. It delivers one lump sum and one payment, with a 30-year fixed spine and no revolving structure. The tradeoff: you replace your first mortgage instead of leaving it alone.
What Does DSCR Actually Tell You About Cash Flow?
Less than people think. DSCR compares rent to PITIA only. Repairs, vacancy, management, utilities, and capex sit outside the calculation. Clearing 1.00 is not positive cash flow.
Add the line payment on top, and a deal can clear coverage while running negative in real life. A line-funded down payment also pushes your combined leverage toward 100% of the price. If rent dips or pricing on the line floats up, there is little cushion.
Coverage numbers vary by program. For DSCR files, 1.00 is where many select programs start, and stronger ratios open better pricing and leverage. A separate select-lender path takes coverage below 1.00 with leverage and terms adjusted. A 620 credit floor exists in parts of the network, most programs want around 660, and 700+ unlocks the strongest tiers.
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.
Common Misconceptions
“The line payment counts against my DSCR.” Generally not. The ratio compares the subject property’s rent to its own PITIA. The payment still reduces your real cash flow.
“DSCR means no DTI anywhere.” The line is DTI-tested. Only the purchase loan is rent-qualified.
“43% DTI is the federal limit.” That figure came from an older qualified-mortgage rule that loans backed by government-sponsored enterprises were exempt from, as the Dallas Fed explains. Treat it as a common yardstick. Limits vary by product and lender, and this network’s line allows up to 50%.
“A first-lien HELOC buys the house.” It supplies cash. A separate loan closes the purchase.
“My DTI stops mattering after I buy.” The line stays on your credit report and counts in future DTI-based loans.
Putting It Together
Start with the line, not the listing. Size the equity, test the DTI, take the smaller number, subtract closing costs and reserves, and divide by the down-payment percentage. Then check that the rental’s rent covers PITIA at the leverage you want. The complete DSCR loans guide walks through how those purchase files are built.
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. Programs change, every file is underwritten individually, and nothing here is a commitment to lend.
Frequently Asked Questions
Does the HELOC payment count in the DSCR on the new rental?
Generally not. The ratio compares that property’s rent to its own PITIA. The line payment still comes out of your real cash flow, and a lender reviewing a later DTI-based loan will count it.
Can an LLC-owned rental hold the line?
No. The line must be held by you individually or by a revocable living trust. A property already deeded to an LLC needs a vesting change, or a DSCR cash-out refinance instead, subject to program terms.
How large a line can a rental support?
On an investment property, up to 70% CLTV with a 700 credit minimum, capped at $500,000 total. Existing liens count against that 70%, so a free-and-clear rental has the most room.
How much of the line gets drawn at closing?
At least 75%. That matters for DTI, because the test uses the interest-only payment on the maximum draw regardless of what you plan to use.
Is 50% DTI the limit everywhere?
No. It is the maximum on this network’s lines, with 45% for credit profiles from 600 to 679. Lenders and products set their own limits.
About Lendmire
Lendmire (NMLS# 2371349) is a mortgage broker. Home equity lines of credit — on a primary residence, a second home or an investment property — are arranged through wholesale lenders in Lendmire’s 16 full-service states, and every line is underwritten by the lender under its program guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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References
1. Experian: What Is a First-Lien HELOC?
3. Dallas Fed: Ability to Repay
This article is part of Lendmire’s home equity line of credit program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Should a Homeowner Use a HELOC to Build an ADU or Pool? · HELOC vs Cash-Out Refinance for a Retiree on Pension Income · How to Get a HELOC After a Quitclaim in a High-Cost Closing State
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Important disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage brokerage. Lendmire is not a direct lender, depository institution, or financial advisor. All loan inquiries are subject to lender underwriting; this article does not constitute a commitment to lend. Rates, terms, and program guidelines are subject to change without notice and vary by borrower profile, property type, and state. Information in this article is general in nature and is not financial, legal, or tax advice. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.