How Much Can You Borrow on an Investment Property HELOC and Keep a Locked-in Mortgage?

The Quick Read: It depends on how much you already owe, but on an investment property you can usually borrow up to 70% combined loan-to-value, minus your first mortgage, capped at a $500,000 line, and the first mortgage stays exactly as it is because the new line sits behind it as a second lien. Lenders judge you on credit and personal debt, not on the rent.

• The formula is value × 70% − first-mortgage balance, then the $500,000 line cap applies.
• The first mortgage and its terms stay in place; only the new line carries its own pricing.
• Investment lines through Lendmire’s network need a 700 credit score, and a higher score adds eligibility, not leverage.
• The deed must be in your personal name or a revocable living trust, not an LLC.
• When the numbers or the title don’t fit, a DSCR cash-out refinance is the usual fallback. Each figure is subject to lender guidelines and a complete review of property type, leverage, and credit.

How Much Can You Borrow on an Investment Property HELOC?

The ceiling is 70% combined loan-to-value, which means every loan against the property, added together, can reach 70% of its value. Subtract what you owe on the first mortgage. What is left is your room, up to a $500,000 maximum line. The minimum line is $25,000.

Here is the formula in plain steps:

1. Establish the property’s value. On investment lines this is usually an automated valuation, not a full appraisal. 2. Multiply that value by 70%. 3. Subtract your first-mortgage balance (and any other liens). 4. Compare the result to the $500,000 cap and the $25,000 minimum. The smaller of your room and the cap is your ceiling.

One detail trips people up. The lender counts the full credit limit toward the 70%, not just the part you draw. A portion of the line you never draw still uses up your leverage room.

Your first mortgage’s interest rate plays no part in this math. Only its balance does. That is why a low-rate loan from years ago is no obstacle. It just becomes a number you subtract.

Here is how the room shrinks as your first mortgage grows, shown as a share of the property’s value:

A high-value rental with a small first mortgage hits the $500,000 cap before the 70% limit. A modest rental with a large first mortgage hits the 70% limit first. Which limit binds depends on the property’s value and the size of the first mortgage.

Does a HELOC Really Leave Your First Mortgage Alone?

Yes. A HELOC on a property that already has a mortgage is a second mortgage, paid in addition to the first, as the CFPB’s explanation of home equity lines describes. Your first loan keeps its balance, its schedule, and its terms. You are not refinancing anything.

That is the whole appeal. A cash-out refinance replaces the entire first mortgage, so everything you owe is repriced. A line behind the first touches only the money you borrow.

The trade-off is real, though. The line itself is not a fixed-rate loan. On Lendmire’s network, investment lines run a 5-year draw period followed by a 25-year repayment period, and the pricing floats through both periods and never converts to fixed. During the draw you pay interest only. Then the balance amortizes.

What Does the Lender Look at Besides Equity?

On a bank-style investment line, the lender underwrites you. It does not underwrite the rent. Here is what that means on Lendmire’s network, subject to lender guidelines:

• Credit: a 700 minimum on investment properties, which is a hard floor. Scores of 700 and 720 both reach 70% CLTV, so a higher score doesn’t raise your limit.
• Debt-to-income: up to 50% maximum, tested on the interest-only payment calculated on the maximum draw. Your personal debts and the full line both count.
• Credit report: pulled no more than 90 days before closing.
• Past credit events: a bankruptcy needs 4 years of seasoning from discharge or dismissal. On investment files, a foreclosure follows a 7-year path, and a deed-in-lieu, pre-foreclosure, or short sale follows a 4-year path.
• Valuation: because the investment line caps at $500,000, and full appraisals begin only above that, most investment lines run on automated valuation with no traditional appraisal. You can still request a full appraisal.

Property types that qualify include single-family homes, 2-4 unit buildings, PUDs, townhomes, and condominiums, including non-warrantable ones. Manufactured homes, co-ops, condotels, log homes, commercial and mixed-use properties, and agricultural zoning are not eligible.

Exposure has limits too. A borrower can hold up to three lines, and anyone with more than 15 financed properties is not eligible. Lendmire’s HELOC availability is limited to 16 states: AL, CA, CO, FL, GA, IN, MI, MT, NM, NC, OH, PA, TN, TX, VA, and WA. That is narrower than the 41-market DSCR footprint, and a broker confirms it before you plan around a line.

Why Title Decides Everything

Title is the structural gate on this kind of line. Only an individual or a revocable living trust can hold it, so an LLC, corporation, partnership, or irrevocable, blind, or land trust is shut out. A DSCR loan, by contrast, can be made to an LLC, subject to lender program eligibility.

If your rental is already in an LLC, you have two choices. You can change the vesting, or you can use a DSCR cash-out refinance instead. Moving title on a mortgaged property can interact with the first mortgage’s due-on-sale clause, so talk to a real estate attorney before you retitle anything. The first mortgage’s own documents still govern the property.

Many investors hold rentals in LLCs for liability reasons. If that is you, the HELOC route may already be closed.

Key Terms Defined

Second lien: a loan that sits behind your first mortgage. If the property is sold or foreclosed, the first lender is paid first.

Combined loan-to-value (CLTV): all loans on the property added together, divided by its value. It is the number the 70% ceiling applies to.

Draw period: the stretch when you can borrow from the line and pay interest only. On investment lines here it is 5 years.

Vesting: how the deed is titled, meaning who legally owns the property. Vesting decides whether a HELOC is even available.

Automated valuation: a computer-generated value estimate used instead of a full appraisal, common on lines of $500,000 or less.

DSCR (debt service coverage ratio): monthly rent divided by the monthly obligation of principal, interest, taxes, insurance, and any HOA dues. It measures whether the property’s income covers its payment.

HELOC or DSCR Cash-Out: Which Fits?

The right pick depends on how large your first mortgage is, how big your cash need is, and how the property is titled. The CFPB’s HELOC booklet illustrates the standard method with 75% of value minus the mortgage balance. That is an illustration, and the booklet is dated. On Lendmire’s network, an investment property line stops at 70% CLTV.

A DSCR cash-out qualifies primarily on property-level rental income covering the payment, subject to lender guidelines. Many select programs start at 1.00 coverage, and stronger ratios open better pricing and leverage. Clearing 1.00 does not mean the property produces positive cash flow, because repairs, vacancy, management, and utilities sit outside that calculation.

So which investor are you?

• Pick the HELOC if your first mortgage is well below 70% of value, your need is under $500,000, your credit is 700 or better, you hold title personally, and you want the first mortgage untouched.
• Pick the cash-out if your first mortgage is near the ceiling, your need is larger than the line allows, or the property sits in an LLC.
• Pick neither yet if your personal DTI is already stretched. The HELOC test runs on the full line at an interest-only payment.

A Worked Example in Percentages

Say a rental carries a first mortgage equal to 45% of its value. At a 70% CLTV ceiling, your room is 25% of the property’s value. If that 25% works out to more than $500,000, the cap trims it. If it works out to less than $25,000, the line is too small to exist.

Now change one input. Suppose the same property carries a first mortgage at 62% of value. Room drops to 8% of value. Whether that clears the $25,000 minimum depends on the property’s value, and on a lower-valued property it falls short, so no line fits and a cash-out refinance becomes the practical path.

Run your own version of this before you apply. The site’s illustrative calculator can help you estimate it, though it does not produce a quote.

Common Mistakes and Misconceptions

• Assuming primary-home limits apply. Primary-residence lines on this network can reach 90% CLTV, but only at a 720 or better credit profile. Investment lines stop at 70%. Do not mix the two.
• Thinking a better score raises the limit. Past 700, it only improves eligibility.
• Counting only the drawn amount. The whole limit counts toward leverage and DTI.
• Expecting a fixed payment. Pricing floats and never converts to fixed, in the draw and the repayment period alike.
• Planning to leave the line unused. At least 75% is drawn at closing.
• Treating a line as an LLC tool. It is a personal loan on your title.

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. Lendmire is a broker that arranges financing through select lenders in its wholesale network. If a cash-out refinance fits better, the complete DSCR loans guide walks through how those files are built. All figures here are subject to lender guidelines and a full file review, and nothing here is a commitment to lend.

About Lendmire

As a mortgage broker (NMLS# 2371349), Lendmire helps homeowners and real estate investors in its 16 full-service states open home equity lines of credit arranged through wholesale lenders. Lendmire is never the lender; line amounts, ceilings and terms are set by the lender under its guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. CFPB’s explanation of home equity lines

2. CFPB – What You Should Know About Home Equity Lines of Credit (booklet)