The Quick Read: A HELOC calculator for buying a rental works in two separate steps: the first sizes how much cash your existing equity can release as a line of credit, and the second tests whether the rental you plan to buy clears its own rent-to-payment coverage once that borrowed cash becomes your down payment, closing costs, and reserves. A home equity line of credit (HELOC) creates cash. It does not buy the property. A separate purchase loan does that, and it has its own rules.
- On an investment property, the network’s HELOC ceiling is 70% combined loan-to-value, with a $500,000 maximum line and a 700 minimum credit score.
- On a primary residence, the ceiling reaches 90% combined loan-to-value, but only at a 720-or-better credit profile.
- Usable cash is the draw minus closing costs and reserves. Divide it by your down-payment percentage to get the price it supports.
- Clearing 1.00 coverage on the rental does not mean positive cash flow. The line’s own payment sits outside that ratio.
Every figure here is subject to lender guidelines and full file review. This is not a commitment to lend.
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.
Key Terms Defined
Combined loan-to-value (CLTV) is all the loans secured by a property, added together, divided by its value.
Draw period is the stretch when you can borrow from the line. Payments in this stretch are interest-only on the investment line described below.
Repayment period is the stretch after the draw ends, when you can no longer borrow and the balance amortizes.
Debt-to-income ratio (DTI) is your monthly debts divided by your monthly income.
PITIA is principal, interest, taxes, insurance, and any association dues on a loan.
DSCR (debt service coverage ratio) is a property’s monthly rent divided by its monthly PITIA.
How the Calculator Works
The math has two steps, and most online calculators only run the first.
Step one sizes the line: property value × the CLTV ceiling, minus what you already owe on that property, capped at the program’s maximum line.
Step two converts the draw into a purchase: usable cash ÷ your down-payment percentage = the purchase price that cash supports.
Then comes the test that decides whether the deal is sane. Does the rent cover the new loan, and can you carry the line’s payment on top of it?
A site calculator on this page is an illustrative estimate. It can show how the inputs interact. It cannot show a quote, a payment, or an approval.
Step One: Size the Line
Across the wholesale network Lendmire works with, HELOC ceilings depend on occupancy. On an investment property, the ceiling is 70% CLTV with a $500,000 maximum line. A 720 score and a 700 score both reach that same 70%, so credit above 700 buys eligibility, not extra leverage. Below 700, an investment line is not available.
On a primary residence or second home, the ceiling climbs to 90% CLTV. That figure exists only at a 720-or-better credit profile. Treat it as a top tier, not a typical outcome.
Run three scenarios in percentages of value.
- Primary home owing 55% of its value: at 90% CLTV with a 720+ profile, the line sizes at 35% of the home’s value, before any dollar cap.
- Existing rental owing 40% of its value: at the 70% investment ceiling, the line sizes at 30% of the rental’s value, capped at $500,000.
- Free-and-clear rental: the line sizes at 70% of value, and the $500,000 cap usually binds first on anything but a modest property.
Two program details change how you use the result. First, the line is sized on the maximum draw, and the DTI test (50% maximum) runs on the interest-only payment at that maximum. Second, at least 75% of the line is drawn at closing. You cannot open a large line and leave it idle. Size the line close to the cash you need.
On valuation, an investment line caps at $500,000, so it generally runs on an automated valuation, and a traditional appraisal is commonly not needed.
Step Two: Turn the Draw Into a Purchase Price
Usable cash is what remains after closing costs and reserves. Reserves are cash left in the bank after closing. On most DSCR purchase files they commonly run around 6 months of PITIA, though they vary by lender, leverage, loan size, and transaction type. The undrawn portion of a line generally does not count as reserves.
Purchase leverage on most files lands at 75% to 80% LTV, which means 20% to 25% down. Select programs reach 85% LTV with about a 700+ score. Here is what each down-payment level means for usable cash:
| Down payment | Price supported by usable cash |
|---|---|
| 25% (75% LTV) | 4.0 times usable cash |
| 20% (80% LTV) | 5.0 times usable cash |
| 15% (85% LTV) | About 6.7 times usable cash |
Closing costs and reserves come out of the draw first, so the table is a ceiling, not a target. Many first-time landlords find the usable cash is thinner than the headline line size suggests.
Does the New Property Pass Its Own Test?
Passing the HELOC test does nothing for the purchase loan. That loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines.
The calculation is monthly rent divided by monthly PITIA. The rent figure typically comes from the appraiser’s rent schedule: Form 1007 on a single-unit property, Form 1025 on two to four units.
A coverage of 1.00 is where select programs start, not a universal standard. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted. Stronger ratios open better pricing and leverage. Lendmire’s complete DSCR loans guide walks through how the ratio is built.
Here is the trap. DSCR compares rent to PITIA only. Repairs, vacancy, management, utilities, and capital expenses sit outside it. So does your HELOC payment. A rental can clear 1.00 and still lose money every month once the line is paid.
Stress-Test the Line Payment
A HELOC is an open-end line of credit you can borrow against repeatedly, per the CFPB’s HELOC explainer. It generally has a draw period followed by a repayment period, and the rate is usually variable. The CFPB’s HELOC brochure adds that some plans allow interest-only payments during the draw, so nothing goes toward principal.
The network’s investment line follows that pattern: a 5-year interest-only draw, then a 25-year fully amortizing repayment. Pricing floats across both stretches and never converts to fixed. The DSCR purchase loan, by contrast, is typically built on a 30-year fixed spine. One payment moves. The other does not.
Run the cash flow three ways:
1. Today: rent, minus the new loan’s PITIA, minus a realistic allowance for repairs, vacancy, and management, minus the line’s interest-only payment.
2. Payment rises: the same math with a higher line payment, because the line floats.
3. Repayment begins: the same math after the line starts amortizing, when the payment steps up because principal now gets paid.
If your own income and reserves cannot carry scenario three, the deal is too tight. A first-time landlord has no rental history to lean on, so the cushion has to come from reserves.
You pay only on the amount you actually borrow from a HELOC, and a lender may stop advances under certain conditions. An undrawn line is permission, not committed money.
Which Property Secures the Line?
You cannot open a line on the property you are about to buy. The line comes from something you already own, and the draw becomes the next deal’s cash.
| Secured by | Network ceiling | Main risk |
|---|---|---|
| Your primary home | Up to 90% CLTV at 720+ | Your residence backs an investment bet |
| An existing rental | 70% CLTV, 700 minimum | That rental backs the new one |
The home line gives more room, but a default puts your residence at risk. The rental line is tighter and has a lower ceiling, but it keeps the home out of the deal. Pick based on which downside you can survive.
Title matters too. On this program, the line must sit on property held by you individually or by 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, depending on program guidelines.
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. A borrower is limited to three lines, and anyone with more than 15 financed properties is not eligible. This HELOC program runs in Lendmire’s 16 full-service states, which is narrower than its 41-market DSCR footprint, Washington, D.C. included.
Will the Purchase Lender Accept Borrowed Cash?
It depends on the program. Across the DSCR lenders in the network, there are roughly three camps:
- Programs that accept documented line proceeds as down payment.
- Programs that cap how much of the cash can be borrowed.
- Programs that require a slice of the cash to be fully unborrowed.
Ask before you draw. This is the question most first-time landlords learn about too late.
Purchase lenders also trace the money. They commonly review recent bank statements and look hard at large deposits. Draw the cash into an account in your own name, and keep the trail clean from the line to your account to escrow. A rushed draw the week before closing invites questions about sourcing.
Funding the entire down payment from a line means financing close to 100% of the price. Leverage stacks faster than rent can carry it. You can pass the coverage test and still bleed cash each month.
One tactic you will see online is using the line for property A, refinancing later to pay it off, then reusing the line for property B. It depends on appreciation and on lenders being willing to refinance. Treat it as unproven, not a plan.
HELOC Versus the Alternatives
| Option | What it gives you | Main catch |
|---|---|---|
| HELOC | Flexible cash, interest-only draw | Floating payment, home or rental at risk |
| Home equity loan | Lump sum | Fixed payment, but still a second lien |
| DSCR cash-out refinance | Cash from a rental, reviewed on rent | Replaces the existing first mortgage |
| Saving longer | No new debt | Slower |
On a DSCR cash-out refinance, leverage tops out around 75% LTV across most of the network, and about 6 months of seasoning is the common expectation. For a standard rental, that is a cleaner structure when you already own a rental with equity and the existing loan is worth replacing. These specifics are subject to lender guidelines and a full review of property, leverage, and credit.
First-Time Landlord Risk Check
Before you draw, answer these:
- Does the rent cover the new loan’s payment with room to spare, not barely?
- Could you pay both loans if the rental sat empty for a few months?
- Have you asked the purchase lender whether borrowed down-payment cash is accepted, and how much?
- Does your reserve plan work without counting the undrawn part of the line?
- Do you know the date the line moves from interest-only to repayment, and your exit plan before then?
If any answer is no, consider a smaller or cheaper first property or a different cash source. Lendmire’s checklist for opening an investment property HELOC covers the paperwork side. For weighing lines against each other, see this breakdown of how to compare investment property HELOC offers.
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.
If You Want to Run the Numbers
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.
Frequently Asked Questions
Can I open a HELOC on the rental I am buying?
Not before you own it. The line comes from a property you already own, such as your primary home or an existing rental. The draw then funds the down payment on the new purchase.
Does the HELOC payment lower my DSCR?
Generally no. The ratio compares rent to the PITIA of the loan being underwritten. The line’s payment still comes out of your pocket every month, so it hits your cash flow even though it sits outside the ratio.
Does undrawn credit count as reserves?
Generally no. An undrawn line is permission to borrow, not cash in the bank. Plan reserves from money you have already drawn or saved.
How much of the line do I have to draw?
On the network’s investment line, at least 75% of the line is drawn at closing. Size the line close to what you need, since that portion starts accruing interest immediately.
Is a HELOC better than a DSCR cash-out refinance?
It depends on the equity you hold and what you can carry. A HELOC keeps your existing first mortgage in place but adds a floating payment. A DSCR cash-out replaces the first mortgage and is reviewed on rent, with leverage around 75% LTV on most files.
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.
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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
This article is part of Lendmire’s investment property HELOC program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: How to Buy Investment Property With a HELOC as the Down Payment · How to Get a HELOC on Investment Property That Still Has a Mortgage · VA Cash-Out vs Investment Property HELOC With a Low Home Mortgage
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Disclosures. The information presented in this article is general market commentary, not financial, legal, or tax advice. Lendmire is a mortgage brokerage (NMLS# 2371349) — not a direct lender or depository institution — and loan placement is subject to lender underwriting. Nothing in this content represents a commitment to lend. Loan terms, pricing, and program availability vary based on borrower qualifications, property characteristics, and state of subject property, and are subject to change at any time. Lendmire complies with Equal Housing Opportunity requirements. Consumer access: nmlsconsumeraccess.org.