The Quick Read: Only when the rental’s net cash flow stays positive after both its own mortgage and the HELOC payment, including after the draw period ends and when the line’s pricing rises; a rental that merely covers its own mortgage can still lose money once the second payment is stacked on top of it.
- A HELOC draw is a second payment. The rental has to carry two debts.
- Test the deal twice: once at the interest-only draw payment, once at the fully amortizing repayment payment.
- Clearing 1.00 on a DSCR loan is not the same as positive cash flow. The ratio leaves out repairs, vacancy, management, utilities, and capex.
- On an investment property, the network’s HELOC ceiling is 70% CLTV with a $500,000 maximum line.
- Borrowed down-payment money still counts as cash you have at risk.
What Is the Calculator Actually Testing?
The calculator tests one thing: whether annual cash flow after every debt payment is still positive under stress. Rent minus operating costs minus the first mortgage minus the HELOC payment is the number that matters.
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.
Cash-on-cash return is annual pre-tax cash flow divided by total cash invested. Resideline’s cash-on-cash explainer lists the cash invested as the down payment, closing costs, loan fees, and up-front repairs. LoopNet’s definition uses the same formula. Many investors treat 8% to 12% as the target. That is a convention, not a rule.
Two mistakes inflate the result. The first is leaving vacancy, maintenance, and capex out of expenses. The second is leaving rehab and closing costs out of cash invested.
A HELOC adds a third trap. If the draw pays the down payment, the cash-invested figure looks small and the percentage looks large. That cash is still your money at risk, because the line is secured by property you own. Count it in the denominator. Count the HELOC payment as a cost in the numerator. Skip either step and the return is flattering and wrong.
How Does the HELOC Payment Change Over Time?
The payment is lowest at the start and highest at the end. The structure drives this, and the draw period is the cheap part.
On the network’s primary-residence lines, the draw period is either 3 years interest-only with a 17-year fully amortizing repayment, or 5 years interest-only with a 25-year repayment. Investment-property lines run the 5-year draw and 25-year repayment structure only. Pricing floats on all of them and does not convert to fixed. At least 75% of the line is drawn at closing, so the interest meter starts running on most of the balance on day one.
The federal consumer-finance regulator describes this plan design: a draw period, then a repayment period. A variable plan can change your payment even if you draw nothing more. Its HELOC explainer adds that monthly payments are often significantly higher once repayment begins.
That is where rentals break. Rent that covers interest only can fall short when principal is added. Lendmire’s piece Investment Property HELOC Calculator Draw and Repayment Phases walks through that step-up in more detail.
The Calculator Logic, Step by Step
Run these steps in order. Each one feeds the next.
1. Size the line. Take the property value, multiply by the lender’s CLTV percentage, then subtract everything owed against the property. What remains is the potential line, capped by the program.
2. Decide the draw. Pick the amount and list what it pays for: down payment, closing costs, rehab, reserves. Draws used for reserves still cost you interest.
3. Run the HELOC payment twice. Use the interest-only draw payment first. Then use the fully amortizing repayment payment over the contract’s actual term. Stress both with the index higher than today.
4. Build the rental’s net operating income. Start with rent. Subtract vacancy, taxes, insurance, repairs, management, and a capex reserve.
5. Subtract both debts. Take out the rental’s own mortgage payment, then the HELOC payment. What is left is real cash flow.
6. Divide by cash invested. Include the borrowed down payment, closing costs, fees, and up-front repairs.
7. Repeat at repayment-phase payments. If this line goes negative, the draw does not pay for itself.
The pass test is simple. Cash flow after the HELOC payment stays positive when pricing rises, vacancy is added, and the repayment payment replaces the interest-only payment.
A Worked Example in Ratios
The inputs below are modeled assumptions, not market data. They show how a deal that looks fine can fail the second test.
Say a rental’s net operating income covers its own first mortgage at about 1.30x after vacancy and a repair reserve. That is a healthy first-mortgage cushion. Now add the HELOC that funded the down payment. At the interest-only draw payment, combined coverage across both debts drops to roughly 1.05x. The deal passes, barely.
Then the repayment phase starts. Principal gets added to the HELOC payment, and combined coverage slips to about 0.90x. The rental now loses money every month, and the shortfall comes out of your pocket. Add a rise in the index and a few months of vacancy, and the gap widens.
| Scenario | Combined coverage | Read |
|---|---|---|
| Draw phase, today’s pricing | About 1.05x | Passes, thin |
| Draw phase, pricing up | Below 1.05x | Margin erodes |
| Repayment phase | About 0.90x | Fails |
| Repayment phase plus vacancy | Lower still | Cash call |
The takeaway is not that HELOC-funded purchases fail. It is that the draw-phase result alone tells you almost nothing. Build the calculator so it shows both phases side by side.
Why Doesn’t DSCR Above 1.00 Mean Positive Cash Flow?
Because the ratio measures rent against PITIA only. PITIA is principal, interest, taxes, insurance, and any association dues. Repairs, vacancy, management, utilities, and capex sit outside it, and so does the HELOC payment.
On most files across the wholesale network, 1.00 is where select programs start. A separate select-lender path goes below 1.00 with leverage and terms adjusted. Stronger ratios open better pricing and leverage. None of that tells you what lands in your account each month. A rental can clear the purchase lender’s ratio and still lose money after the line is paid. The ratio is a lender’s test. The cash-flow figure is your test.
How Do Purchase Lenders Treat Borrowed Down-Payment Funds?
It depends on the lender and the program, so confirm before you go under contract. Borrowed funds may be acceptable for one pot, such as the down payment, and treated differently for closing costs or reserves.
Two principles hold across the network:
- The HELOC does not buy the property. It supplies cash. A separate loan closes the purchase, and that lender sets the down-payment, reserve, and source-of-funds rules. HELOC proceeds do not waive any of them.
- Expect to document the trail. Lenders typically want the HELOC closing paperwork, confirmation of the draw, statements showing the cash landing in your account, and a credit report showing the new liability.
For the purchase loan itself, most files land at 75% to 80% LTV, which means 20% to 25% down. Select programs reach 85% LTV with roughly a 700 or better score. Reserves vary by lender, leverage, loan size, and transaction type, and are commonly around 6 months of PITIA. Some conservative rate-term files under $1,500,000 at modest leverage can see reserves waived, while loans above that size typically step up to about 9 months. All of this is subject to lender guidelines.
The part many investors miss is that down payment and reserves are separate tests. A draw that funds the down payment leaves the reserve requirement standing. If the line also has to fund reserves, you are borrowing against your home to prove you could survive borrowing against your home. These specifics are subject to lender guidelines and a full review of property, leverage, and credit.
Which Property Secures the Line?
The answer changes the limits, the risk, and the paperwork.
A line on your primary home. On the network, primary-residence and second-home lines can reach 90% CLTV, but only at a credit profile of 720 or better. The home is the collateral. If the new rental underperforms, the exposure is your residence.
A line on an existing rental. This is a narrower product. On the network, an investment-property line tops out at 70% CLTV and a $500,000 maximum line, with a 700 minimum credit score. Credit above 700 buys eligibility, not leverage, since both 700 and 720 reach the same 70% ceiling. Because the line cannot exceed $500,000, it normally runs on automated valuation without a traditional appraisal, although a borrower can request one.
The rental you are about to buy. You cannot open the line on it. The line has to exist before contract.
Other network limits worth knowing:
- The line itself runs $25,000 to $750,000, but anything above $500,000 is primary-residence only and needs a full appraisal.
- DTI maxes at 50%, and the qualifying payment is calculated on the interest-only payment at the maximum draw.
- The line must be held by an individual or 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 or a DSCR cash-out instead.
- Manufactured homes, co-ops, condotels, log homes, and commercial or mixed-use properties are not eligible.
- A borrower is limited to three lines and cannot own more than 15 financed properties.
- HELOC placements run in Lendmire’s 16 full-service states, which is narrower than its 41-market DSCR footprint, Washington, D.C. included.
The Edge Cases That Break Files
Most failures come from timing and structure, not from the arithmetic.
Line freezes. Lenders can freeze or reduce lines when values fall. Do not build an exit that depends on the line staying open.
Occupancy changes. Turning an owner-occupied home into a rental can trigger restrictions or re-pricing in the line agreement. Read the agreement before you move out.
Rent covers interest but not principal. The draw-phase numbers look fine and the repayment-phase numbers go negative. This is the most common failure.
A BRRRR-style exit. Buy, rehab, refinance, repeat works only if the takeout refinance is available when needed. On a DSCR cash-out refinance, 75% LTV is the ceiling across most of the network on a standard rental, and about 6 months of seasoning is the common expectation. Files that assume the seasoning away get kicked back. Terms depend on the lender’s guidelines, the property type, the leverage, and a full review of the credit profile.
HELOC debt in personal DTI. The new liability shows on your credit report and counts against future HELOC or conventional applications. That is a separate approval from the DSCR loan, with a different decision rule: the HELOC is underwritten on you, and the DSCR loan is underwritten on the property.
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 Different Structure Fits Better
Compare structures on total monthly obligation, fixed versus floating pricing, closing costs, and the reserves you have left. Do not compare pricing alone.
| Structure | Pricing | Leverage ceiling | Key limit |
|---|---|---|---|
| HELOC on investment property | Floats | 70% CLTV | $500,000 line cap |
| HELOC on primary home | Floats | Up to 90% CLTV at 720+ | Home is collateral |
| DSCR cash-out refinance, standard rental | Per program | 75% LTV | About 6 months seasoning |
| DSCR cash-out refinance, short-term rental | Per program | 70% LTV | About 12 months hosting history |
A cash-out refinance replaces the existing loan and delivers a lump sum, so the monthly obligation is one payment instead of two. It also resets your first-mortgage terms, which can cost you a good existing loan. A HELOC leaves the first mortgage untouched and adds a floating second payment. Neither is better in the abstract. The better one is whichever passes the repayment-phase test with room to spare.
The complete DSCR loans guide covers the purchase and refinance side.
Run It, Skip It, or Restructure It?
Use this decision rule after both phases are modeled.
- Run it when combined coverage stays above 1.00x in the repayment phase with vacancy and a higher index applied, and reserves are intact after the draw.
- Restructure it when the draw phase passes but the repayment phase fails. Draw less, put more of your own cash in, or consider a cash-out refinance on an existing property instead.
- Skip it when the draw has to fund reserves, when the rental needs rehab you have not priced, or when the only exit depends on the line staying open.
The calculator on this site is an illustrative estimate. It shows an interest-only payment based on your inputs, not a quote or actual figures for your file. Treat it as a way to test assumptions, not a commitment to lend.
Key Terms Defined
CLTV: Combined loan-to-value, the total of all liens on a property divided by its value.
Draw period: The stretch when you can borrow from the line and usually pay interest only.
Repayment period: The stretch after draws end, when the balance is paid down with principal and interest.
Cash-on-cash return: Annual pre-tax cash flow divided by total cash invested.
DSCR: Debt service coverage ratio, monthly rent divided by the monthly PITIA.
PITIA: Principal, interest, taxes, insurance, and association dues, if any.
Frequently Asked Questions
Can I use a HELOC to buy a rental property?
Yes, if the line already exists before you go under contract. The HELOC supplies cash for the down payment and costs, and a separate loan closes the purchase. That purchase lender sets the source-of-funds, down-payment, and reserve rules, so confirm how it treats borrowed funds before you draw.
What if the rent doesn’t cover the HELOC payment?
The shortfall comes out of your own cash, and if the line sits on your primary home, that home is the collateral. Model the repayment phase before drawing, not after. If the numbers fail, draw less, add cash, or look at a different structure.
Does an LLC change anything?
Yes. On the network, a HELOC must be held by an individual or a revocable living trust, so LLCs cannot hold title. A rental already in an LLC needs a vesting change or a DSCR cash-out refinance instead, subject to lender program eligibility.
Is a HELOC better than a cash-out refinance for a rental?
It depends on which payment structure your cash flow can carry. A HELOC leaves the first mortgage alone but adds a floating second payment. A cash-out refinance gives one payment and resets the first loan. Test both on the same deal in the repayment phase.
Does DSCR above 1.00 mean the rental cash flows?
No. The ratio measures rent against PITIA only, so repairs, vacancy, management, utilities, capex, and the HELOC payment are all outside it. A file can clear the ratio and still lose money monthly.
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. Lendmire is a mortgage broker, not a lender, and every figure here is subject to lender guidelines and full file review. Reach the team at 828-256-2183 or request a quote.
About Lendmire
Lendmire is a mortgage brokerage (NMLS# 2371349) arranging home equity lines of credit — primary-residence, second-home and investment-property lines — through a wholesale lending network in its 16 full-service states. Eligibility is determined by the lender on each file. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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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. Resideline – What is a good cash-on-cash return
2. LoopNet – Cash-on-cash return in real estate investments
3. CFPB – What you should know about HELOCs (brochure)
5. Lofty – HELOC on investment property
This article is part of Lendmire’s investment property HELOC program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: DSCR vs HELOC for a Landlord Who Needs Cash From a Rental · How to Take Out a HELOC on a Rental Property You Already Own · How the FAFSA Counts a HELOC on a Rental Property
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
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.