How an Investment Property HELOC Works on a $860K Rental With a $500K Mortgage

The Quick Read: On this property, the combined-loan limit sets the size of the line, and that limit leaves room for roughly $102,000 behind the existing mortgage, subject to lender guidelines. Here is what drives that result:

• The $500K mortgage is already about 58% of the $860K value.
• On Lendmire’s wholesale network, an investment-property line tops out at 70% combined loan-to-value (CLTV).
• The line can run up to $500,000, but the 70% limit binds first on this rental.
• Approval rests on your credit, debt-to-income ratio, and equity, not on the rent.
• The rental must be titled in your name or a revocable trust, not an LLC.

Key Terms Defined

HELOC: a home equity line of credit, a revolving line secured by property you already own.

CLTV (combined loan-to-value): every loan secured by the property, including the new line, divided by the property’s value.

Draw period: the first stretch of the line, when you can borrow and typically pay interest only.

Repayment period: the later stretch, when borrowing stops and the balance amortizes.

AVM (automated valuation model): a software-generated value estimate used in place of a traditional appraisal.

Lien position: your place in line for repayment if the property is sold or foreclosed. The first mortgage is first; a new line behind it is second.

How an Investment Property HELOC Works

An investment-property HELOC is a revolving line secured by a rental you own but do not live in. It is not a DSCR loan. It is a home equity product applied to a rental.

NerdWallet reports that these lines are possible but come from a smaller pool of lenders, with strict requirements and less borrowing power than a primary-home line. It also describes the typical bank version as a 10-year interest-only draw with a variable rate.

Lendmire arranges these lines through select wholesale lenders. Across that network, the investment-property line works like this:

• It is a standalone line in first or second lien position.
• It runs from $25,000 to $500,000.
• The draw period is five years, followed by a 25-year repayment period.
• At least 75% of the line is drawn at closing.
• Pricing floats through both phases and never converts to fixed.

That 75% draw matters. Most of the line is borrowed, and accrues interest, from the first day.

Availability is also narrower than Lendmire’s DSCR footprint. These lines are offered only in 16 full-service states, so confirm your state before building a plan around one.

How Much Room Does an $860K Rental With a $500K Mortgage Leave?

About $102,000 at most. The formula is value times the CLTV ceiling, minus what you already owe. Yahoo Finance gives the same CLTV method: add all loans, including the proposed line, then divide by value.

The network figure for an investment property is lower. It caps at 70% CLTV, whether your score is 700 or 720 or higher.

Run it on this property. These are modeled inputs, not market data:

1. Current standing: $500,000 ÷ $860,000 is about 58.1% before any line. 2. Total liens allowed: 70% × $860,000 is $602,000. 3. Room: $602,000 minus the $500,000 first mortgage leaves about $102,000.

The $500,000 line cap never comes into play. The CLTV limit binds first.

Treat $102,000 as a ceiling, not a promise. Credit, DTI, and valuation can only shrink it. Value swings it hard, because every $10,000 of lost value removes exactly $7,000 of room at a 70% limit.

The network counts the full line limit toward CLTV, not just the drawn balance. Since at least 75% of the line is drawn at closing anyway, sizing a line larger than you plan to use still eats into your leverage budget.

How Underwriting Treats the File, Step by Step

This is the order a lender works through your file.

1. Eligibility screen. The rental must be a non-owner-occupied single-family, 2-4 unit, PUD, townhome, or condo. Manufactured homes, co-ops, condotels, log homes, commercial, mixed-use, and agriculturally zoned properties are not offered.

2. Valuation. Because an investment line caps at $500,000, it normally runs on an AVM with no traditional appraisal. A higher CLTV may trigger a secondary valuation, and you can request a full appraisal. Banks outside the network may ask for multiple appraisals.

3. CLTV test. The lender applies the 70% limit, subtracts the first mortgage, and caps the result at the line maximum.

4. Credit. Investment lines need a 700 minimum. Going from 700 to 720 buys no extra leverage; it only helps eligibility.

5. Debt-to-income. DTI can run up to 50%, with the payment measured as interest-only on the maximum draw. Rent does not rescue a weak ratio, because the file is underwritten on you, not the property.

6. Reserves. These vary by lender, and a low first mortgage earns no special credit.

7. Title and the first mortgage. Your existing mortgage must permit a second lien. Due-on-sale protections for junior liens are written around owner-occupied homes, so a rental is less clear. Read your note and security instrument and get any consent in writing.

8. Closing and draws. The line records behind your $500K mortgage, whose terms and payment stay unchanged. Later draws carry a $1,000 minimum in most states.

A typical document set includes your current mortgage statement, the insurance declaration page, and the vesting deed. Every figure here is subject to lender guidelines and a full file review.

Structures and Variations

First or second lien. Here you already have a first mortgage, so the line sits second. On a paid-off rental, the same line can sit first.

Closed-end second. Some lenders will not write a revolving line on a rental but will write a fixed-amount second mortgage. If you want a set sum, ask whether that version exists.

Title. Fee simple or leasehold held by you or an inter vivos revocable living trust. An LLC, corporation, partnership, or irrevocable or land trust cannot hold title.

DSCR cash-out. If the property sits in an LLC, a vesting change or a DSCR cash-out refinance is the usual route. Lenders look at rent versus the full housing payment there, not your personal income.

For the full picture of how rental-based loans work, see Lendmire’s complete DSCR loans guide.

Where the General Rule Breaks

LLC-titled rentals. The line cannot be written on them. Many investors discover this only after they have an application in.

Thin equity. A fresh rehab or BRRRR property often has not built enough equity to size a line. If value is near $715,000, room behind $500,000 at 70% is essentially zero.

Exposure limits. A borrower can hold up to three lines, and combined exposure on the structure investment lines use caps at $750,000. A borrower with more than 15 financed properties is not eligible.

Recent listings. In several states, a property listed for sale within the past 60 days is ineligible.

Property-count limits. Banks outside the network may cap how many investment properties they will lend against.

Later refinance. The line has to be paid off before a cash-out refinance of the same property. It is also paid off at sale.

Payment shock. The CFPB’s HELOC booklet explains that a plan has a draw period and a repayment period. On a variable-rate plan, payments can change even if you borrow nothing more. It also notes that variable-rate plans secured by a dwelling must carry a rate cap by law.

On this network, the rental’s payment steps up when repayment begins and the balance starts amortizing over 25 years. Before drawing, check that rent still covers your total obligations at that stage. DSCR does not do that for you, because it compares rent only to the housing payment, and repairs, vacancy, management, and capex sit outside it.

HELOC or DSCR Cash-Out on This Rental?

The right tool depends on how much cash you need and how the property is titled.

The 75% figure is a cash-out ceiling on a standard rental across most of the network. A cash-out typically expects about six months of seasoning.

A HELOC fits when you want $100,000 or less, plan to keep your first mortgage, and hold title personally. A cash-out fits when you need more than the room allows, hold the rental in an LLC, or want your debt in one fixed structure. Reserves, credit, and property eligibility apply to both.

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.

About Lendmire

Lendmire, NMLS# 2371349, is a mortgage brokerage that arranges home equity lines of credit through wholesale lending partners in its 16 full-service states. Lines on primary residences, second homes and investment properties are each reviewed individually by the lender under the program’s occupancy, credit and combined-loan-to-value guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. NerdWallet – Can You Get a HELOC on an Investment Property

2. Yahoo Finance – CLTV explainer

3. CFPB – What you should know about HELOCs