How Much Can You Borrow on an Investment Property HELOC for Buying Your Third Property?

The Quick Read: You can usually borrow up to 70% combined loan-to-value (CLTV) on the rental securing the line, minus every lien already on it, and never more than $500,000 on an investment property. Your limit is the smallest of three numbers: the equity room under the 70% ceiling, the dollar cap, and what your debt-to-income ratio can carry. Final terms depend on the guidelines of the wholesale partner Lendmire places your file with.

• An investment-property line runs from $25,000 up to $500,000, with a 700 minimum credit score.
• A score of 700 and a score of 720 both reach the same 70% CLTV, so higher credit buys eligibility, not leverage.
• Title must sit with you personally or in a revocable living trust. An LLC cannot hold it.
• Your debt-to-income (DTI) ratio can run up to 50%, though it is capped at 45% for credit profiles from 600 to 679 and anything above 45% needs a 680 minimum. An investment line already floors at 700, so the 50% maximum is the one that applies.
• Lendmire arranges these lines in its 16 full-service states only, which is narrower than its DSCR footprint.

Buying property number three does not change the line’s math. The line’s size depends on the equity in the property that secures it. It does not depend on how many properties you own or plan to buy.

How Is the Maximum Line Calculated?

The formula is simple: property value times the CLTV cap, minus every existing lien, equals your maximum new line. CLTV means combined loan-to-value, which adds your first mortgage and the new line together and divides by the property’s value.

Run the numbers on a rental worth $400,000. At the 70% investment-property ceiling, total debt can reach $280,000. Your existing first mortgage uses that room first. Whatever is left is the most the line can be, and the $500,000 cap only matters on large, lightly mortgaged properties. (The $400,000 value is an illustration, not a market figure.)

Two cases show which limit decides the answer:

• The percentage binds. A rental with a sizable mortgage runs out of equity room long before it reaches $500,000. Here the CLTV ceiling is your answer.
• The dollar cap binds. A high-value, paid-off or nearly paid-off rental has more room than $500,000. The cap stops you, and the extra equity sits unused on this product.

Valuation is usually automated. Because an investment line cannot exceed $500,000, and full appraisals begin only above that amount, these lines normally run on an automated valuation. A higher CLTV may trigger a second valuation, and you can request a full appraisal if you want one.

Which Property Should Secure the Line?

You have three choices: a rental you already own, your primary home, or the new purchase itself. Each changes the limit and the risk.

Primary-residence lines are the bigger tool. They reach 90% CLTV only at a 720 or better credit profile, and a line above $500,000 is primary-residence only. That larger line needs a 700 score or better (720 on the structure with a 5-year interest-only draw and 25-year repayment) and caps at 75% CLTV with a full appraisal.

Bigger is not safer. Investors on BiggerPockets note that drawing on your home to fund a rental puts your home behind the investment, and that the new property must cash-flow its own mortgage plus the line.

What Changes at Property Number Three?

Your DTI and your paperwork change, not the formula. Two existing mortgages already count in your debt-to-income ratio. The line is qualified on the interest-only payment calculated on the maximum draw, even if you plan to draw less. That means a large line can squeeze your DTI before you use a dollar of it.

The network allows DTI up to 50%. It is 45% for credit profiles from 600 to 679, and anything above 45% needs a 680 minimum. On an investment line the 700 floor already sits above those thresholds.

Other limits show up as you add properties:

• Title. Fee simple or leasehold held by you or a revocable living trust. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts cannot hold title. If your rental is deeded to an LLC, you need a vesting change, or a DSCR cash-out refinance instead.
• Exposure. A borrower is limited to three lines. Combined exposure caps at $2,000,000 on the higher-leverage program and $750,000 on the longer-runway program. Anyone owning more than 15 financed properties is not eligible.
• Eligible property types. Single-family, 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 eligible.
• Listing rule. In NC, PA, TN, TX, and WA, a property listed for sale, or listed within the past 60 days, is ineligible.

How Does the Line Work After You Close?

Investment lines run a 5-year interest-only draw, then a 25-year fully amortizing repayment, and the payment floats the whole time. At least 75% of the line is drawn at closing. Pricing never converts to fixed.

That 75% draw is the part many investors miss. You are not opening a line to leave it untouched. You start paying on most of it right away, so size the line to the purchase rather than to your maximum.

Federal consumer guidance backs up the variable-payment point. The CFPB’s HELOC booklet says home equity lines typically carry variable rates and that lenders may freeze or reduce a line if the home’s value declines significantly. Those materials are written for home-secured consumer plans, so treat them as context rather than a description of any one investor line. The practical lesson stands: do not build a purchase that falls apart if the line shrinks.

Can the Line Cover the Whole Purchase or Just the Down Payment?

It can fund either, but most investors use it for the down payment. The line is cash. The purchase lender still applies its own down-payment, reserve, and source-of-funds rules to those borrowed funds, so expect to document where the money came from.

Purchase leverage on a DSCR loan, the usual loan for property number three, mostly lands at 75% to 80% LTV, meaning 20% to 25% down. Select programs reach 85% LTV with a score around 700 or higher. Stack a borrowed down payment on top of a high-leverage purchase loan and you can end up financed near 100% of the price. That is the real danger of the combination. Terms depend on the lender’s guidelines, the property type, the leverage, and a full review of the credit profile.

A DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. That is a different test from the HELOC, which is tested on your credit, DTI, and equity. Clearing a 1.00 coverage ratio, where select programs start, is not the same as positive cash flow. Repairs, vacancy, management, and capex sit outside the calculation.

For the full picture of how that purchase loan works, see Lendmire’s complete DSCR loans guide.

How Do You Stress-Test the Third Property?

Test the deal against a payment that rises and a line that might shrink. Both can happen at once.

1. Model the new property’s DSCR with your down payment sourced from the line. Rent should clear the new loan’s payment with room to spare.

2. Add the line’s interest-only payment on your real draw, which is at least 75% of the line. Ask whether the property carries that cost too, or whether your other income does.

3. Raise the line’s payment and rerun it. Variable pricing never converts to fixed.

4. Assume the line is frozen or reduced after you close. If you could not repay or refinance it, size down.

BiggerPockets practitioners are blunt about this. One lender in a forum discussion on using a HELOC to buy another investment property said a line should not stay open long, because the variable rate disrupts the numbers on a long-term rental. The logic favors a plan to refinance or pay the line down. A BRRRR or flip, where you pay it back out of the deal, fits that profile better than a long hold you never touch.

When Does a DSCR Cash-Out Beat the HELOC?

When the title, the dollar cap, or your DTI blocks the line. A DSCR cash-out refinance is tested on the property’s rent against its payment, not on your personal income.

DSCR cash-out tops out around 75% LTV across most of the network, with about 6 months of seasoning as the common expectation. It scales better because it does not depend on your personal DTI. One investor in a BiggerPockets thread on HELOC down payments wrote that for another 5 to 10 deals, a HELOC alone would not cut it. That is an investor’s view, not a rule, but it matches how the two tools behave. The exact numbers vary by lender and program and follow a full review of property, leverage, and credit.

Key Terms Defined

• CLTV (combined loan-to-value): Every loan against the property, including the new line, divided by the property’s value.
• Draw period: The stretch when you can borrow from the line and pay interest only. Here it runs 5 years on an investment line.
• Repayment period: The stretch after the draw, when you pay principal and interest. Here it runs 25 years.
• DTI (debt-to-income): Your monthly debt payments divided by your monthly income. The line is tested against this.
• DSCR (debt service coverage ratio): Monthly rent divided by the monthly payment on principal, interest, taxes, insurance, and dues.

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. Call 828-256-2183 or request a quote. Programs change and every file is reviewed individually; this is not a commitment to lend.

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.

References

1. BiggerPockets – Using HELOC for down payment or full purchase

2. CFPB – What You Should Know About HELOCs (booklet)

3. BiggerPockets – Using a HELOC to buy another investment property

4. BiggerPockets – Is using a HELOC for down payment of rental property

5. BiggerPockets – Rookie podcast on home equity