How Much Can You Borrow on an Investment Property HELOC for Charleston Landlords Borrowing?

The Quick Read: Usually, you can borrow up to 70% of the property’s value on an investment-property line, minus every lien already on it, and the line can never exceed $500,000 or fall below $25,000, with a 700 minimum credit score. That is the ceiling on the wholesale network Lendmire brokers through, subject to lender guidelines.

• The limit is a combined loan-to-value (CLTV) test: value times 70%, minus your first mortgage balance.
• A 720 score reaches the same 70% as a 700 score. Higher credit adds eligibility, not leverage.
• The full line counts toward CLTV and debt-to-income (DTI) whether or not you draw it.
• An LLC cannot hold title on this product. The property must be in your name or a revocable living trust.
• Rent does not set the limit. Your credit, DTI, and equity do.

How Is the Maximum Line Calculated?

The maximum line is the property value times the allowed CLTV, minus all liens already on the property. On an investment property in this network, the allowed CLTV is 70%. Then two dollar limits apply: a $25,000 minimum and a $500,000 maximum.

Here is the formula in four steps.

1. Start with the property’s value, as set by an automated valuation or an appraisal. 2. Multiply that value by 70%. This is the most total debt the property can carry. 3. Subtract your existing first mortgage balance and any other liens. 4. Check the result against the line-size limits. If it is above $500,000, the cap applies. If it is below $25,000, the property does not fit the product.

Express it as a share of value and the arithmetic stays simple. Say your first mortgage sits at 40% of the property’s value. The most you can open is 30% of value (70% minus 40%). If your balance sits at 60% of value, only 10% of value is left. On many properties that falls below the line minimum.

A paid-off rental sits at the other end. The 70% ceiling leaves a lot of room, so the $500,000 cap becomes the binding number. Extra equity above that point adds nothing to the line.

The line is a standalone product, so it is not tied to your existing mortgage. It can be placed in first or second lien position, which means a rental with no mortgage can carry it in first position, while a rental with a mortgage carries it behind that loan.

Why Is the Number Lower Than on a Primary Home?

Lenders treat rentals as higher risk, so the ceiling is lower and the credit bar is higher. Across this network the ceilings depend on occupancy. An investment line tops out at 70% CLTV. Primary-residence and second-home lines can reach 90% CLTV, but only with a credit profile of 720 or better.

The wider market looks similar in direction. NerdWallet reports that rental HELOC limits run lower than primary-home limits. It also notes that many lenders sit below their stated maximum, and its table shows a market-wide cap of 80% LTV with a 720 score. On this network, the investment-property ceiling is 70% CLTV at a 700 or better score.

Experian adds that rental lines are generally harder to qualify for. Not every lender offers one. Expect a higher credit score, a lower DTI, and stronger reserves than a primary-home line demands.

A large share of banks do not write rental lines at all. In a BiggerPockets Rookie Reply episode, the guest says many banks decline them, and some will offer only a commercial line. Seeing many lenders’ guidelines side by side is the reason a broker can matter here. Appetite for rental lines differs a great deal from one lender to the next.

What Else Shrinks Your Number?

Several limits can pull the line below the pure equity math. Most come from the borrower, not the property.

• Credit. The floor is 700 on an investment line. There is no tier beneath it, and a higher score does not raise the leverage ceiling.
• DTI. The maximum is 50%. The payment is calculated on the interest-only amount at the maximum draw, so a large line weighs on DTI even when you do not use it.
• Draw at closing. At least 75% of the line is drawn at closing. That is not a revolving cushion you leave untouched.
• Exposure. A borrower is limited to three lines in total. An owner with more than 15 financed properties is not eligible.
• Property type. Single-family, 2-4 units, PUDs, townhomes, and condominiums, including non-warrantable condos, are eligible. Manufactured homes, co-ops, condotels, log homes, commercial, mixed-use, and agriculturally zoned properties are not.
• Credit report age. The report cannot be more than 90 days old at closing, and no rescores are allowed.

Rent can help show that you can carry the debt. It does not set the line size. A DSCR-style loan is the product reviewed on rent against payment.

How Is the Property Valued?

On an investment line, the property is usually valued by an automated valuation model. Because the line cap is $500,000 and full appraisals are required only above that amount, an investment line commonly closes with no traditional appraisal. You can request a full appraisal in any case. A higher CLTV may also trigger a secondary valuation.

Valuation affects your number more than most borrowers expect. A model that reads the property a few percent low pulls the 70% ceiling down with it. If you disagree with the model, a full appraisal is the way to put your own comparable sales on the record.

How Do the Draw and Repayment Periods Work?

Investment-property lines on this network use one structure: a 5-year interest-only draw period followed by a 25-year fully amortizing repayment period. Pricing floats through both periods and does not convert to a fixed amount.

Plan for the shift. When the draw period ends, the payment on any balance changes from interest only to principal and interest. That step up is the main cash-flow risk of the product.

The CFPB’s HELOC booklet makes two related points. Lines are usually variable and secured by the property. A lender can also reduce the line if the property’s value falls. It also warns that renting out a home may be prohibited under the terms of a line, which matters if you convert a primary residence to a rental after opening one.

Should You Borrow Against the Rental or Your Home?

Borrowing against the rental keeps the risk on the rental. Borrowing against your primary home usually allows higher leverage, but it puts the home at risk to fund an investment. The two lines are different products with different ceilings, and which is better depends on the property, your equity, and how much risk you want your home to carry.

Some investors use the home line to fund a rental purchase. That can work on paper. A drop in rent or a vacancy on the new property then becomes a problem for the home that secures the line.

HELOC or DSCR Cash-Out: Which Fits?

A HELOC leaves your first mortgage alone. A cash-out refinance replaces it. That single difference drives most of the decision.

Choose the HELOC when you hold a first mortgage you want to keep and need a modest, flexible amount. Choose a DSCR cash-out when you hold the property in an LLC, own many mortgaged properties, or want a larger one-time sum. Lendmire’s complete DSCR loans guide covers how coverage is measured on that side. Clearing a 1.00 coverage ratio compares rent to the housing payment only. It does not mean positive cash flow, since repairs, vacancy, management, and utilities sit outside the calculation.

Edge Cases That Change the Answer

Title in an LLC. The line cannot close if an LLC holds title. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts all fail the vesting test. A property already deeded to an LLC needs a vesting change or a DSCR cash-out instead. An investor in a BiggerPockets thread on HELOC availability for a rental reports running into exactly that lender condition.

Rental with a mortgage on it. Availability is lender-specific. Some lenders will place a second-lien line behind your first mortgage, and others will not. Ask early.

Recent bankruptcy or foreclosure. A bankruptcy needs 4 years of seasoning from discharge or dismissal. A foreclosure on an investment file follows a 7-year path, and a deed-in-lieu, pre-foreclosure, or short sale follows 4 years.

Property listed for sale. In several states, a property listed for sale, or listed within the past 60 days, is ineligible.

State availability. The equity-line product is offered in 16 states. A landlord in a state outside that list cannot use it, regardless of the equity math.

Key Terms Defined

CLTV (combined loan-to-value): Total debt secured by the property, including your first mortgage and the new line, divided by its value.

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

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

Lien position: Where a loan ranks for repayment. A first lien is paid first, and a second lien comes after it.

Vesting: How the property is titled, for example in your own name, in a revocable trust, or in an LLC.

DTI (debt-to-income): Your monthly debts divided by your monthly income.

Next Steps

Gather the facts that drive the number before you ask any lender. You will want your current mortgage balance, an honest value estimate, your credit score, and a list of every financed property you own. With those four items, you can run the formula above and see roughly where you land against the $25,000 minimum and the 70% ceiling.

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 and does not lend directly. Every figure above is subject to lender guidelines and full file review, and nothing here is a commitment to lend.

About Lendmire

Lendmire, NMLS# 2371349, is a mortgage brokerage that arranges home equity lines of credit through wholesale lending partners in its 16 full-service states. Lines on primary residences, second homes and investment properties are each reviewed individually by the lender under the program’s occupancy, credit and combined-loan-to-value guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. NerdWallet

2. Experian

3. BiggerPockets — Rookie Reply episode on rental HELOCs

4. CFPB — HELOC booklet

5. BiggerPockets — HELOC availability on a rental