How Much Can You Borrow on an Investment Property HELOC on a Primary Residence?

The Quick Read: It depends on your home’s value, your first-mortgage balance, and the combined loan-to-value ceiling that applies, which on a primary residence reaches 90% only for borrowers with a 720 or better credit profile, and the line itself runs from $25,000 up to $750,000. These are guidelines from select lenders in Lendmire’s wholesale network, and every file is reviewed individually.

• The formula is home value times the maximum combined LTV (CLTV), minus what you still owe on the first mortgage.
• Market surveys report that most lenders stop near 85% CLTV on a primary home. On Lendmire’s network the primary-residence ceiling is 90%, and only at 720 or better.
• A line placed on the rental itself tops out lower: 70% CLTV and $500,000, with a 700 minimum score.
• Lines above $500,000 are available on primary residences only, at up to 75% CLTV with a full appraisal.
• Cash from the line helps with the down payment, but the purchase lender decides how borrowed money is counted.

What Is Actually Being Asked Here?

Two different loans hide inside this question, and they have different ceilings. The first is a line secured by the home you live in, with the cash used to buy a rental. The second is a line secured by the investment property itself.

Both are home equity lines of credit. A HELOC is an open-end line you can borrow against repeatedly during a draw period, followed by a repayment period.

Lenders judge a primary-home line mostly on you and the house. The rental you plan to buy does not enter that decision. Rent matters later, when a separate investor loan finances the purchase.

The Formula That Sets Your Limit

Your maximum line equals home value times the CLTV ceiling, minus the balance on your first mortgage. CLTV counts every lien on the property, including the full limit of the new line.

NerdWallet describes a typical lender allowing up to 85% of home value minus what you owe, and its example works out to $55,000 for a $300,000 home with a $200,000 mortgage. That is a market-wide figure, not a network one.

On Lendmire’s network, a primary residence can reach 90% CLTV at a 720 or better profile. Here is the same math in percentages.

• First mortgage equals 60% of value, ceiling 90%: the line can reach up to 30% of value.
• First mortgage equals 80% of value, ceiling 90%: the line can reach up to 10% of value.
• First mortgage equals 85% of value, ceiling 90%: only about 5% of value remains, and that may fall below the $25,000 minimum line.

Several things can still pull the number lower after that. Credit tier, the line-size cap, and the debt-to-income test all apply. A few states also set lower caps for primary residences, and Texas homesteads stop at 80%.

What Moves Your Number

Credit tier is the first lever, and it matters more on a primary residence than on a rental. The 90% primary-residence ceiling exists only at a 720-or-better profile. Below that, the ceiling steps down depending on the credit profile. The program floor is 600.

Line size is the second lever. The range is $25,000 to $750,000. A line above $500,000 is for primary residences only. It requires a 700-or-better credit profile (720 on the longer-runway structure, the one with a 5-year interest-only draw). It caps at 75% CLTV and requires a full appraisal.

Debt-to-income is the third lever. The maximum is 50%, with 45% for profiles from 600 to 679. A ratio above 45% requires at least a 680 score. The test uses the interest-only payment on the maximum draw, not on what you plan to borrow.

Valuation is the fourth. Lines at or below $500,000 ordinarily use an automated valuation, though a higher CLTV may call for a secondary valuation. Every line above $500,000 needs a full appraisal, and you can request one at any size.

Two structures are available on primary residences. One has a 3-year interest-only draw followed by a 17-year repayment. Pricing floats during both the draw and the repayment period and does not convert to fixed.

At least 75% of the line must be drawn at closing. That detail shapes sizing, because a line much larger than your actual need means paying interest on money you borrowed only to meet the minimum draw.

Primary-Home Line vs. Line on the Rental

An investment line is qualified on the borrower’s credit, income and debts rather than the rent. Credit above 700 buys eligibility on that product, not extra leverage. Title must sit with an individual or a revocable living trust. If your rental is already deeded to an entity, a vesting change or a DSCR cash-out is the usual route, subject to program terms. Lendmire’s piece on HELOC rules for LLC-titled borrowers covers that structural difference in detail.

For many investors the primary-home line is the higher-leverage source. The tradeoff is risk. The collateral is the house you live in, so a missed payment puts your own home in play.

How Much Should You Actually Borrow?

Size the line backward from the down payment you need, not forward from the maximum. Most DSCR purchase files land at 75%-80% LTV, which means roughly 20%-25% down. Select programs reach 85% LTV (15% down) with about a 700 score or better. No DSCR purchase program in the network allows zero down. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.

Reserves are a separate test. They are commonly around 6 months of PITIA, and they vary by lender, leverage, loan size and transaction type. Many programs accept a documented line draw for the down payment and closing costs. Many of them exclude borrowed money from reserves. A few cap the borrowed share, and the strictest want some unborrowed cash in the file.

So a plan to fund 100% of the down payment, closing costs and reserves from the line can fail on that basis alone. Keep some cash in the bank.

Consider an investor buying at 75% LTV who pulls the 25% down payment from a primary-home line. The purchase loan is judged on the new property’s rent against its own payment. DSCR divides monthly rent by the full monthly payment: principal, interest, taxes, insurance and any HOA dues. Many select programs start at a 1.00 coverage floor. A separate select-lender path allows coverage below 1.00, with leverage and terms adjusted. Exact terms depend on the lender’s guidelines, property type, leverage, and a full review of the borrower’s file.

The HELOC payment generally stays outside that ratio. Even so, clearing 1.00 is not the same as positive cash flow. Repairs, vacancy, management and capex sit outside the calculation, and the line payment sits on top of them.

Put differently, a purchase can meet the coverage test while the investor’s real monthly picture is tight.

Where Primary-Home Lines Go Wrong

Rental use can violate the terms. The CFPB’s HELOC booklet warns that renting out the home securing your line may be prohibited under the line’s terms. That matters if you plan to move out later.

The same booklet says that if you sell the home, you generally must pay off the line in full right away. It also says a lender can reduce your line if the home’s value falls.

Lenders differ on whether they will write a line for an investor’s purpose at all, and programs change. This is why comparing several options matters more than accepting the first approval.

Lines are also variable. Payments rise when the draw period ends and the balance starts amortizing. Stress-test the repayment stage before you sign, not just the interest-only stage.

Key Terms Defined

CLTV: Combined loan-to-value is all loans secured by the property, including the new line’s full limit, divided by the property’s value.

Draw period: The stretch when you can borrow against the line and pay interest only.

Repayment period: The stretch after the draw period, when the balance amortizes with principal and interest.

DSCR: Debt service coverage ratio is monthly rent divided by the property’s full monthly payment (PITIA).

PITIA: Principal, interest, taxes, insurance and association dues.

When the Line Is Not the Right Tool

A HELOC fits the investor with solid equity, a 720-plus profile, and a plan that does not require borrowing every dollar. It also suits a short holding period, such as buying and then refinancing out of the line.

It fits less well when the home’s first mortgage is already near 85% of value. It also fits poorly when the line would cover the entire purchase, because the new property then has no equity cushion.

If the rental you own already has equity, a DSCR cash-out refinance is another route. On standard rentals it tops out around 75% LTV, with about six months of seasoning common. The DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. Lendmire’s complete DSCR loans guide explains how the two products compare.

One more filter matters. Manufactured homes, log homes and barndominiums are not offered in the DSCR network, so those collateral types need a different plan.

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. Home equity lines are arranged in Lendmire’s 16 full-service states, while its DSCR investor programs span 41 markets, including Washington, D.C. Investors can reach the team at 828-256-2183 or request a quote through the mortgage quote page.

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. HELOC is an open-end line

2. NerdWallet

3. CFPB: What you should know about home equity lines of credit