How Much Can You Borrow on an Investment Property HELOC for Buying Another Rental House?

The Quick Read: Usually up to 70% combined loan-to-value on an investment property, minus every lien already on it, with the line capped at $500,000 and a 700 credit score required, so the amount you can borrow is set by remaining equity first and the dollar cap second, subject to lender guidelines. That ceiling is lower than the one on a primary home, and the line is only the first half of the plan, because a separate purchase loan still has to approve the next rental.

• Lines run from $25,000 to $500,000 on an investment property, and at least 75% of the line is drawn at closing.
• Title must sit in your personal name or a revocable living trust. An LLC cannot hold title on the property securing the line.
• An undrawn line is not cash. The purchase lender will want to see the money in your account.

How Is the Maximum Line Calculated?

The maximum line is the property’s value times the lender’s combined loan-to-value cap, minus every loan already secured by that property. On a rental, the network’s cap is 70% combined loan-to-value. That means your first mortgage plus the new line cannot exceed 70% of what the property is worth.

The CFPB’s HELOC booklet describes the same mechanic: lenders typically set the credit limit as a percentage of the home’s value, less the mortgage balance. The investment version just uses a lower percentage.

Here is the math without dollar figures. Say your first mortgage equals 50% of the rental’s value. A 70% cap leaves room for a line worth 20% of the value. If the first mortgage equals 60%, the room shrinks to 10%. If the property is paid off, the full 70% is available, until the $500,000 line cap takes over.

That is why two investors with similar-looking properties can see very different results. On a leveraged rental, the percentage test usually binds first. The dollar cap matters mainly on high-value, low-debt properties, where the percentage test would allow more than the program will lend.

Market surveys report that lenders typically cap rental lines at 80%, per Experian. That is a market-wide figure and an upper bound, not a norm. The network figure for an investment property is 70% combined loan-to-value, with no tier above it.

Why Do Rentals Get Lower Limits Than a Primary Home?

Lenders see more default risk on a rental than on the home you live in. NerdWallet notes that this risk is why rental lines are harder to get, why the pool of lenders is smaller, and why you may borrow less. It also says multiple appraisals may be required to confirm a rental’s value.

The network reflects that caution through occupancy-based ceilings. On a primary residence or second home, the ceiling reaches 90% combined loan-to-value, but only at a 720 or better credit profile. On an investment property, the ceiling is 70%, full stop.

Availability is also narrower than most investors expect. Lendmire’s HELOC placements run through 16 full-service states, which is a smaller footprint than its 41-market DSCR platform, so a line that works in one state may not be available in another.

What Do Lenders Look at Besides Equity?

Equity gets you into the conversation. The rest of the file decides whether the line is approved. Across the wholesale network, the investment-line checklist looks like this:

• Credit: 700 minimum, with no tier beneath it. Score history is read on the primary wage earner, and the report can be no more than 90 days old at closing.
• Debt-to-income: 50% maximum, qualified on the interest-only payment calculated on the maximum draw.
• Valuation: Because an investment line tops out at $500,000, it ordinarily runs on an automated valuation with no traditional appraisal. A higher combined leverage may call for a secondary valuation, and a borrower can request a full appraisal anyway.
• Structure: A 5-year interest-only draw period followed by a 25-year fully amortizing repayment period. Pricing floats during both periods and never converts to fixed.
• Exposure: A borrower is limited to three lines, and an owner of more than 15 financed properties is not eligible.
• Property type: Single-family, 2-4 units, PUD, townhome, and condominium, including non-warrantable condos. Manufactured homes, co-ops, condotels, log homes, commercial, mixed-use, and agricultural-zoned properties are not offered.

Notice what is missing from that list: the rent. A rental line is reviewed on you, meaning your credit, your debts, and your equity. That is a very different test from the one a DSCR loan applies.

Does a Better Credit Score Raise the Limit?

No. A 720 score and a 700 score both reach the same 70% ceiling on an investment line, so a stronger score buys eligibility, not leverage. Below 700, the investment line is simply not available through the network.

This catches investors who assume better credit always means more money. On a primary-residence line, score tiers matter more. On a rental line, the score works like a gate. You are either through it or you are not.

Which Property Should Secure the Line?

Investors have two choices: borrow against the rental you own, or borrow against your own home. The right answer depends on equity, risk tolerance, and the credit profile.

*LLC-titled DSCR loans are available subject to lender program eligibility.

The primary-home line offers more leverage, but the trade is real. If the next rental underperforms, the lien on your home is what is exposed. The CFPB’s HELOC overview notes that a line secured by your home puts the home at risk if you fall behind.

A rental line contains that risk to the rental, but it caps leverage lower. For an investor who wants to keep the personal residence out of the picture, the 70% ceiling is the price of that separation.

Can You Use a HELOC as the Down Payment on Another Rental?

Yes, with conditions that depend on the purchase loan, not the line. The HELOC is one approval and the purchase mortgage is another. The purchase lender decides whether borrowed funds count.

Most DSCR purchase programs land at 75% to 80% loan-to-value, which means 20% to 25% down. Select programs reach 85% loan-to-value with 15% down and roughly a 700 or better score. No zero-down DSCR purchase exists. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.

Across the network, lenders split three ways on borrowed funds. Some accept them toward the down payment. Some cap the borrowed share. Some want part of the down payment to come from your own unborrowed money.

An undrawn line does not count as reserves. It is permission to borrow, not liquid money. Reserves vary by lender, leverage, loan size, and transaction type. About six months of PITIA is common, and loans above $1,500,000 typically step up to about nine months. Conservative rate-and-term files at modest leverage under $1,500,000 can see reserves waived.

That is why the sequencing matters. The purchase lender will want the closing papers, proof of the draw, and the funds seasoned in your account.

The Leverage Math Most Investors Miss

A borrowed down payment means you are financing close to the full purchase price. BiggerPockets points out that this is the practical effect of using a line for a down payment. You owe the purchase mortgage and the line, and the new property has to carry both.

Here is where the two tests diverge. A DSCR purchase loan compares the new property’s monthly rent to its own PITIA, meaning principal, interest, taxes, insurance, and any association dues. That ratio does not include your HELOC payment. A file can clear 1.00 on coverage while the line payment still drains your real cash flow.

Clearing 1.00 is also not the same as positive cash flow. Repairs, vacancy, management, utilities, and capital expenses all sit outside the calculation. A coverage ratio near 1.00 on the purchase, combined with a floating line payment, leaves very little cushion.

On coverage floors: 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. Both are real options. Neither is a reason to buy a property that only works on paper.

The line payment also has a place in your personal numbers. Because the HELOC is reviewed on DTI, it counts against the 50% maximum when you apply for any additional line. Anyone planning more than one deal should model that ceiling before the first draw.

Who Should Skip the Rental HELOC Entirely?

An investor who does not fit the title rules or the dollar cap is better served by a different tool. A few profiles fit that description:

• LLC owners. A property already deeded to an LLC cannot secure the line. It needs a vesting change first, or a DSCR cash-out refinance instead.
• Investors with thin personal income. Because the line is reviewed on DTI, a file with modest personal income and heavy existing debt can hit the 50% ceiling before the equity runs out.
• Portfolio builders. The three-line limit and 15-property cap mean the line stops scaling. An investor planning many more acquisitions will hit the exposure caps first.
• Investors who want to avoid a floating payment. The line’s pricing floats through both periods and never converts to fixed. A DSCR cash-out refinance offers a 30-year fixed spine, with 40-year terms and interest-only periods available through select lenders.

Lendmire’s best investment property HELOC program for buying another rental with rental equity goes deeper on how the program is structured.

A Quick Sequence From Equity to Closing

The order of operations determines whether the plan works. A typical path looks like this:

1. Count your equity. Take 70% of the rental’s value and subtract every lien. The result is your ceiling, before the $500,000 cap.

2. Check the gates. Confirm 700 credit, title in your name or a revocable trust, a 50% or lower DTI, and an eligible property type.

3. Open and draw. Close the line and take at least 75% of it at closing.

4. Hold the funds in your account. Keep the draw documented and separate from daily spending.

5. Shop with the purchase lender in mind. Ask which DSCR programs accept borrowed funds for the down payment, and how they treat reserves.

6. Document everything. Provide the line’s closing papers, draw confirmation, and proof of funds for the down payment, closing costs, and reserves.

7. Stress-test the combined obligation. Run the new rental’s rent against both the purchase payment and the floating line payment before you commit.

If you want to see how the numbers change, an illustrative calculator estimate can help, though it is never a quote.

Key Terms Defined

HELOC: A home equity line of credit is a revolving loan secured by property, drawn as needed up to a set limit.

Combined loan-to-value (CLTV): The total of all loans on a property divided by its value.

Draw period: The stretch of time when you can borrow from the line, with interest-only payments on this investment structure.

Repayment period: The stage after the draw period, when the balance amortizes fully.

PITIA: Principal, interest, taxes, insurance, and association dues, the monthly obligation that DSCR coverage is measured against.

DSCR: Debt service coverage ratio, meaning monthly rent divided by PITIA. A DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines.

Where This Leaves You

Investors with a paid-off or lightly leveraged rental, personal title, and a 700-plus credit profile are the best fit for an investment line. The leverage is lower than a primary-home line, but the exposure stays on the rental. Investors who hold property in an LLC, want fixed terms, or plan many acquisitions will usually find the DSCR path fits better. The complete DSCR loans guide walks through how that structure works.

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. All figures are subject to lender guidelines and full file review, and nothing here is a commitment to lend.

About Lendmire

Lendmire — NMLS# 2371349 — is a mortgage broker that arranges home equity lines of credit in its 16 full-service states through wholesale lenders, on primary residences, second homes and investment properties. Every line is subject to the lender’s guidelines and full underwriting. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. CFPB – What you should know about HELOCs (booklet)

2. Experian

3. NerdWallet

4. The CFPB’s HELOC overview

5. BiggerPockets – How to use a HELOC to buy real estate