How Much a HELOC Behind a Low First Mortgage Costs vs. a Refi

The Quick Read: A home equity line of credit (HELOC) leaves your existing first loan in place and adds a second lien behind it. A cash-out refinance replaces the first loan with a new, larger one. Which one costs less depends on how much cash you need, who holds title, and how the rent covers the debt.

• A line suits a modest, one-property cash need when the first loan is worth keeping and you hold title personally.
• A refinance suits bigger cash needs, LLC-held rentals, or investors who want one fixed-term loan.
• On an investment property, the network’s line tops out at 70% combined loan-to-value (CLTV) and $500,000. A cash-out refinance on a standard rental reaches about 75% LTV.
• Neither route is free. The cost sits in closing steps, valuation, and what happens to the balance you already owe. Every figure here varies by lender and program — guidelines, property type, leverage, and credit profile all apply.

This piece compares structure, not pricing. Pricing depends on the file and lives in the site’s illustrative calculator, which gives an estimate, not a quote. What you can compare here is what each path replaces, what it asks of you, and where the fees and risks sit.

Two terms first. CLTV is combined loan-to-value: your first loan plus the new line, divided by the property’s value. DSCR is the debt service coverage ratio: monthly rent divided by the full monthly obligation (principal, interest, taxes, insurance, and any association dues, together called PITIA).

Side-by-Side

Here is the short version of how the two paths differ on the points that decide most files.

The left column reflects the equity line Lendmire’s wholesale network places on investment properties. The right column reflects typical DSCR cash-out guidelines across that network. Everything here is subject to lender guidelines and full file review, and none of it is a commitment to lend.

What Each Path Does to a Low First Mortgage

A HELOC leaves the low first loan exactly where it is and records a second lien behind it. A refinance pays that first loan off and puts a new, larger first lien in its place. If your first loan has terms worth keeping, that one difference drives most of the cost comparison.

Think about what you give up in a refinance. The old loan’s remaining term and payoff schedule disappear. The new loan covers the whole balance, not just the new cash. A small old balance gets swept into a bigger loan, and that bigger loan has to clear its own coverage test.

Across the wholesale network, files with a small first balance rarely turn on loan-to-value. The deciding factor is usually coverage on the refinance side and personal debt-to-income (DTI) on the line side. The refinance asks whether the rent covers the larger obligation. The line asks whether you can carry every debt you hold, with the line counted at its maximum draw.

How Much Cash Can Each Path Reach?

Both limits depend on value, but they differ. On an investment property, the network’s line stops at 70% CLTV and $500,000, with a 700 minimum credit profile. A cash-out refinance on a standard rental goes to about 75% LTV, and about 70% on short-term-rental collateral. Final terms depend on lender guidelines, property type, leverage, and the borrower’s complete credit picture.

Primary-residence lines reach further, up to 90% CLTV at a 720-or-better credit profile on lines up to $500,000. That tier does not apply to a rental. Some investors borrow against their own home and put the cash into the rental. That is a primary-residence line with its own limits, not an investment line.

Run the numbers this way. The table below uses modeled assumptions, not market data. It shows how much value is left to borrow against when the first loan is a given share of the property’s value.

Read the gap carefully. The refinance reaches five points further at every level. Each of those points comes on a loan that replaces your low first. The whole new balance also has to clear the coverage test.

These are points of value before other limits apply. The line has a $500,000 maximum, and on a high-value property that cap can bind before the percentage does. Refinance loan sizes reach up to $3,000,000 on standard programs, with smaller balances available through select lenders, though above $2,500,000 the network generally holds to 30-year fixed structures. A cash-out refinance also usually expects about six months of seasoning, the waiting period after you buy the property.

For a deeper look at the low-first angle, Lendmire’s piece How a Low First-Lien Mortgage Changes the Cash-Out vs HELOC Math walks through more cases.

Where the Fees and Risks Sit

Fees and risks sit in different places on each path. The line carries a lighter closing but a more exposed payment structure. The refinance carries a heavier closing but a more settled one.

On the line side. A HELOC is a revolving line. The CFPB’s HELOC explainer says you can generally spend up to your limit during the draw period, and gives 10 years as an example. Investment lines on this network run a 5-year interest-only draw followed by a 25-year fully amortizing repayment.

The CFPB HELOC brochure describes the main hazards of any line. Interest-only payments leave the principal untouched. When the draw period ends, a repayment period or a lump-sum balance follows. If the line’s pricing is variable, payments can change even when you draw nothing more.

The network’s investment line follows that variable pattern. Its pricing floats through both the draw and the repayment period and never converts to a fixed structure.

There is one more catch. At least 75% of the line must be drawn at closing. The usual pitch for a HELOC is that you pay only on what you draw. On this structure, most of the line starts working, and costing you, on day one. Valuation on lines up to $500,000 usually runs through an automated model with no traditional appraisal. A higher CLTV may still call for a second valuation, and you can request a full appraisal anyway.

On the refinance side. A refinance is a full new first-lien closing with its own title work, valuation, and closing costs. Closing costs on a refinance usually run heavier than on a line, because they are tied to a bigger and more complex loan. Compare both fee lists side by side before deciding.

What you get for that cost is structure. The 30-year fixed is the spine of the network’s DSCR lineup. Extended terms such as 40-year and interest-only periods are available through select lenders, and adjustable structures exist for investors who want them.

Clearing the coverage test is not the same as positive cash flow. DSCR compares rent to PITIA only. Repairs, vacancy, management, utilities, and capital expenses sit outside the calculation.

When a HELOC Is the Better Fit

A HELOC is the better fit when you need a modest amount, your first loan is worth protecting, and you can qualify on your own finances. Several situations point that way.

• The first loan has terms worth keeping. The line leaves it untouched. If you have spent years paying it down, replacing it just to add cash may cost more than it gains. Lendmire’s article How Much a Rental HELOC Saves Over Replacing a Low First Mortgage covers that tradeoff directly.
• The need is small relative to value. The table above shows why. A small first balance leaves a wide gap under the line’s 70% CLTV ceiling, and a small need uses little of it.
• You hold title personally. The line requires title in your own name or an inter vivos revocable living trust. That is a trust you create during your lifetime and can change at any time.
• Your personal profile is strong. The line wants a 700 or better credit profile on an investment property. It allows a DTI of up to 50%, and it is reviewed around the interest-only payment at the maximum draw.
• The rent is thin but your income is strong. The line does not test the property’s rent coverage. It tests you.

Know the limits before you count on it. The equity line is available only through Lendmire’s 16 full-service states, narrower than the 41-market DSCR footprint. Property types that are not eligible include manufactured homes, co-ops, condotels, log homes, commercial, mixed-use, and agricultural-zoned properties.

When a Refinance Is the Better Fit

A refinance is the better fit when you need more cash than a line allows, hold title in an entity, or want the property’s rent to do the qualifying. The picture changes in several ways.

• You need a bigger number. The line stops at $500,000 on investment property. A refinance can reach up to $3,000,000 on standard programs, with smaller balances available through select lenders.
• The rental sits in an LLC. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts cannot hold title on the line. A DSCR cash-out can close in an LLC’s name, subject to lender program eligibility. If the property is already deeded to an entity, the choice is a vesting change or the refinance.
• You hold a portfolio. A borrower is limited to three lines, with combined exposure capped at $750,000 or $2,000,000 depending on the wholesale program. A borrower with more than 15 financed properties is not eligible for the line. A DSCR refinance qualifies primarily on property-level rental income covering the payment, subject to lender guidelines, so it scales across a portfolio.
• Your credit sits below 700. The line floors at 700 on investment property. DSCR programs run a 620 floor in parts of the network, and most want around 660. A 700 or better profile unlocks the strongest leverage tiers.
• You want one settled structure. A 30-year fixed does not float. The line’s pricing does.

DSCR loans are designed for non-owner-occupied investment properties. Because they are business-purpose investor loans, they are reviewed differently from a standard owner-occupied mortgage. For the full picture, see Lendmire’s complete DSCR loans guide.

On coverage, 1.00 is where many select programs start. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted. Stronger ratios open better terms and more leverage.

Be honest about the downside. If your first loan is not actually worth keeping, the refinance loses little by replacing it. In that case, the refinance’s heavier closing is the main extra cost.

A Four-Question Check Before You Choose

Run these four questions in order.

1. Who holds title? If an entity holds it, the line is out. If you hold it personally, both paths are open.

2. How many points of value do you need? Compare that figure to the headroom in the table, and to the $500,000 line cap.

3. Do the tests hold on the new debt? For a refinance, check whether the rent covers the larger obligation. For the line, check whether your DTI holds with every debt counted.

4. How long will you hold, and can you live with floating pricing? A short hold favors the lighter closing of a line. A long hold favors a settled structure.

Then compare both fee lists side by side. Tax treatment can depend on how the funds are used and how the property is held; investors should keep clear records and speak with a qualified tax professional before relying on any deduction.

The Verdict

Neither option wins by default. The line is the better tool for a smaller, targeted need when you hold title personally, your credit profile reaches 700, and the first loan is worth keeping. The refinance is the better tool for larger needs, entity title, portfolio scale, and borrowers who want rent to carry the qualification.

The strongest files clear both tests: enough equity and enough coverage or personal capacity. 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.

About Lendmire

Lendmire is a mortgage brokerage (NMLS# 2371349) arranging home equity lines of credit — primary-residence, second-home and investment-property lines — through a wholesale lending network in its 16 full-service states. Eligibility is determined by the lender on each file. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. CFPB: What is a home equity line of credit (HELOC)?

2. CFPB HELOC brochure