How Much Can You Borrow on an Investment Property HELOC to Fund a Rental Purchase?

The Quick Read: It depends on the property’s value, what you already owe against it, and the lender’s caps. On the wholesale network Lendmire places files with, an investment-property line tops out at 70% combined loan-to-value (CLTV) and $500,000, minus existing liens, and it is sized on you rather than the rent. The cash then becomes your down payment, while a separate loan, usually a DSCR loan, buys the rental.

• The formula is property value × 70% minus every lien already on it, then capped at $500,000.
• The full line limit counts toward CLTV, not just what you draw.
• The line does not buy the rental. The DSCR lender sets its own rules for borrowed down-payment funds, so ask before you draw.
• Clearing the DSCR test does not mean the deal cash flows, and the line payment still comes out of the same rent check.

Key Terms Defined

Six terms do most of the work here.

• CLTV (combined loan-to-value): All loans secured by the property, including the new line at its full limit, divided by the property’s value.
• Lien: A legal claim against the property for a loan. Your first mortgage is the usual one.
• HELOC: A home equity line of credit, a revolving line secured by a property you own.
• DSCR: Debt service coverage ratio, meaning the property’s rent divided by its full monthly housing payment.
• PITIA: Principal, interest, taxes, insurance, and any association dues. This is the payment the DSCR test measures rent against.
• DTI (debt-to-income): Your monthly debts divided by your monthly income.

How Much Can You Borrow on an Investment Property HELOC?

Take 70% of the property’s value, subtract every lien already on it, and stop at $500,000. That is the ceiling on an investment property across this network. Lines run from $25,000 up, and anything above $500,000 is reserved for primary residences, so an investment line never gets there.

Picture it in percentages. Your rental has a first mortgage equal to 45% of its value. The line can reach 25% of value at most (70% minus 45%). Pay the mortgage down to 30% of value and the same property supports a line of up to 40% of value.

Four details trip people up.

The full limit counts. Lenders test CLTV against the whole line, even if you plan to draw half. An unused line still uses up your equity.

Credit stops helping at 700. Both the 720 and 700 tiers reach 70% on an investment property. A 780 score changes nothing on the leverage side.

Rent does not size the line. A HELOC reads you: your credit, your equity, and your debt-to-income. DTI tops out at 50% on this network and is tested on the interest-only payment calculated on the maximum draw. Strong rental income helps your overall profile. It does not raise the limit.

Valuation is usually light. Because an investment line caps at $500,000, it ordinarily runs on an automated valuation instead of a full appraisal. A higher CLTV may call for a second valuation, and you can request a full appraisal anyway.

Which Property Should Secure the Line?

You can place the line on your primary home or on a rental you already own. The answer changes the ceiling.

The 90% figure exists only at a 720-or-better profile, and it is a primary-residence ceiling. Never carry it over to a rental. A line above $500,000 also requires a primary residence, at least a 700 credit profile (a 720 score on the stricter structure some wholesale partners use), a 75% CLTV cap, and a full appraisal.

The primary-home line borrows more, but the collateral is where you sleep. That is the real tradeoff, and the CLTV cap is only part of it.

On this network the investment-property ceiling is 70%, with no tier above it.

Title matters too. The line must be held in your personal name or a revocable living trust. An LLC cannot hold it. A DSCR loan, by contrast, can close in an LLC, subject to program terms. A rental already deeded to an LLC needs a vesting change before it can carry this line, or a DSCR cash-out refinance instead.

Does the Line Actually Cover Your Down Payment?

Often it covers the down payment but not much more. Work the math backward from the purchase.

Most DSCR purchase files land at 75% to 80% LTV, which means 20% to 25% down. Select high-leverage programs reach 85% LTV (15% down), typically with a 700+ score.

Run it on percentages. Say your collateral is worth about what the target rental costs. Your first mortgage is 40% of that value, so the line reaches 30% of value at most. A purchase at 75% LTV needs 25% of price down. That leaves roughly 5% of price for closing costs and everything else. Tight, but possible. With a first mortgage at 55% of value, the line reaches only 15%, and the plan falls short. Final terms depend on the lender’s guidelines, the property type, and the borrower’s complete credit picture.

One structural detail deserves attention. At least 75% of the line is drawn at closing. You cannot open a large line and leave nearly all of it as standby money. Size the line close to what you will actually use, because you will be carrying most of it from day one.

The line itself runs a five-year interest-only draw on an investment property, followed by a 25-year fully amortizing repayment period. The payment moves with the market and never converts to fixed. When the draw ends, the payment steps up, and that is where thin deals get tested.

What Does the DSCR Lender Do With Borrowed Down-Payment Funds?

It depends on the lender. This is the step most investors skip, and it is the one that can break the plan.

Across the wholesale network, the pattern is mixed. Some lenders accept documented line proceeds as down-payment funds. Some cap the borrowed share. A few want part of the down payment to come from your own unborrowed money. Lendmire’s broker view is simple: pick the DSCR lender first, then size the line to that lender’s rule. Do not draw first and hope.

The purchase file has its own gates.

• Leverage: 75% to 80% LTV on most files, with 85% on select high-leverage programs.
• Credit: a 620 floor exists in parts of the network, most programs want around 660, and 700+ unlocks the strongest tiers.
• Coverage: 1.00 is where many select programs start. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted.
• Documents: source-of-funds statements, a lease or rent schedule, an appraisal, and insurance.

The ratio itself is rent divided by the new loan’s PITIA. The HELOC payment generally sits outside it. That helps the ratio, but it does not make the payment disappear.

Here is the catch. One rent check has to carry both payments. The DSCR loan’s payment is in the ratio, and the line’s payment is not, yet both leave your account every month. A deal can clear 1.00 on paper and still run thin. DSCR measures rent against PITIA only. Repairs, vacancy, management, utilities, and capital expenses sit outside it, so clearing 1.00 is not the same as positive cash flow.

When the Number Shrinks

The ceiling is the best case. Several things pull the real number lower.

A low appraisal. The first mortgage does not shrink when value does, so the line absorbs the whole hit. Take a first mortgage at 50% of original value and a line of up to 20%. If value falls 10%, the 70% test now allows only 63% of original value in total. The line drops to 13%, a cut of more than a third from a 10% price move.

A frozen or reduced line. A line you hold is not money you own. The CFPB’s HELOC brochure notes that lenders can generally freeze or reduce a line if the home’s value falls or your finances worsen. The FTC’s home equity guidance names the same two triggers. Plan for an undrawn balance to disappear when you need it most.

A free-and-clear rental. Owning the property outright removes the first mortgage from the math. It does not remove the 70% cap.

A low-balance first mortgage. Only the balance counts, not how cheap the mortgage is. A favorable first loan does not raise the ceiling.

Multiple lines and portfolio size. You can hold up to three lines, but combined exposure is capped. An investor with more than 15 financed properties is not eligible.

Property type. Eligible types include single-family homes, 2-4 units, PUDs, townhomes, and condos, including non-warrantable ones. Manufactured homes, co-ops, condotels, log homes, commercial, mixed-use, and agricultural zoning are not offered.

Geography. Home equity lines through Lendmire are available only in its 16 full-service states. That is narrower than its DSCR investor loan footprint of 41 markets, including Washington, D.C. A DSCR purchase can work where a HELOC cannot.

Is It a Smart Move or Just Possible?

It is a genuine toss-up, and the answer turns on how much cushion the deal has.

The upside is real. Using equity you already hold gets you into a second property without selling anything. For an investor with a paid-down rental or a lot of home equity, it can be the cleanest source of a down payment. Lendmire’s piece on whether an investment property HELOC makes sense for the next rental purchase covers the strategy side in more depth.

The risks stack up, though.

• Near-total financing. Borrowing the down payment means you have put almost none of your own cash into the property. On a thin deal, that leaves no room for a bad year.
• Two payments, one rent check. Described above. Stress-test the rent against both before you commit.
• Collateral risk. Whatever secures the line is what you lose if payments stop. If a rental secures it, you risk the rental. If your home secures it, you risk your home.
• The step-up. After the five-year interest-only draw, the payment includes principal. A deal built on interest-only math can look very different at year six.

The stronger play for many investors might be a smaller line on the rental plus savings for the rest, instead of maxing the line. Though an investor with a large equity cushion and strong rent coverage might reasonably argue the other way.

Or Skip the HELOC?

If your equity sits in a property with a DSCR-eligible profile, a cash-out refinance on that property is the other route. It replaces the first loan and delivers a lump sum, while a line keeps the first loan in place.

For how the underlying loan works, see the complete DSCR loans guide.

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. The illustrative calculator on the site gives a starting estimate, and the final structure depends on lender guidelines and full file review. You can reach Lendmire at 828-256-2183.

About Lendmire

Lendmire (NMLS# 2371349) is a mortgage broker. Home equity lines of credit — on a primary residence, a second home or an investment property — are arranged through wholesale lenders in Lendmire’s 16 full-service states, and every line is underwritten by the lender under its program guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. CFPB HELOC brochure

2. FTC: Home Equity Loans and Home Equity Lines of Credit