How a HELOC Second Lien and a Cash-Out Loan Compare on Monthly Cost

The Quick Read: A cash-out loan replaces the first mortgage and gives one payment on the whole new balance, while a HELOC second lien keeps the first mortgage and adds a second payment on the drawn balance. The cheaper monthly path usually follows the first mortgage: if the existing first-lien terms are better than what a new first lien would carry, keeping them tends to win.

• A cash-out resets the term and the pricing on the entire balance, not just the cash pulled out.
• A second lien leaves the first loan alone and adds a separate payment on top of it.
• On the network’s investment-property HELOC, the draw period is interest-only, so principal does not fall until repayment starts.
• Pricing on the network’s equity line floats and never converts to fixed.
• A DSCR cash-out puts one payment against rent. A second lien stacks two payments.

Monthly cost is the question most investors ask first, and it is the wrong place to stop. Monthly cost shows up differently over time, differs by loan structure, and interacts with how a lender tests the file. This piece walks through the mechanics in order, then the edge cases, then how the decision tends to play out. For the full framework behind these loans, see Lendmire’s complete DSCR loans guide.

What Each Structure Actually Is

A cash-out refinance pays off the existing first mortgage and writes a new one, larger than the old balance. The difference comes to the borrower as cash. One loan remains, one payment, one term, one set of pricing.

A HELOC second lien is a separate line sitting behind the existing first mortgage. The first loan stays untouched. The federal consumer-finance regulator describes a HELOC as an open-end line of credit that lets you borrow repeatedly against home equity, and notes that HELOCs usually carry a variable rate, so payments may change from month to month.

That is the whole structural difference. One loan replaces another. The other loan joins the first.

Key Terms Defined

Second lien: a loan secured by the same property that sits behind the first mortgage in repayment priority.

Draw period: the stretch when the borrower can take funds from the line and typically pays interest only.

Repayment period: the phase after the draw ends, when principal and interest are both due.

Combined loan-to-value (CLTV): the first mortgage plus the new line, divided by the property value.

Debt service coverage ratio (DSCR): monthly rent divided by the full monthly housing obligation: principal, interest, taxes, insurance, and any HOA dues.

Term reset: starting a new amortization clock on a refinance, which lowers the payment but can raise total interest paid.

How the Monthly Cost Gets Built, Step by Step

1. Start with the blended cost, not the headline number. On the HELOC path, the monthly cost is the existing first-mortgage payment plus the payment on the drawn line balance. On the cash-out path, it is a single payment on the new balance. The deciding variable is how the first mortgage’s existing terms compare with what a new first lien would carry today.

2. Look at what the line charges on. The FTC’s consumer guidance on home equity loans and lines of credit explains that because a HELOC is a line of credit, you pay only on the amount you borrow, not the full amount available. In a general bank setting, that is the line’s selling point. On the network’s investment-property line, at least 75% of the line is drawn at closing, so the pay-only-on-what-you-use advantage mostly disappears at the start.

3. Account for the draw period. The investment-property line runs a 5-year interest-only draw followed by a 25-year fully amortizing repayment. During the draw, the payment covers interest, and the balance does not shrink.

4. Plan for the step-up. When the repayment period starts, principal and interest are both due. The payment rises, sometimes sharply. The CFPB’s HELOC booklet notes that monthly payments on a variable-rate line may change even if you don’t draw more money, and that a repayment period follows the draw period.

5. Watch the pricing behavior. On the network’s equity lines, pricing floats across both the draw and the repayment period and never converts to fixed. A cash-out loan can be structured with fixed pricing from closing. So the HELOC’s monthly figure is a moving number. The cash-out figure can be a known one.

6. Add the closing-side items. A cash-out carries costs on the whole new loan, since the whole loan is new. A second lien carries costs on the line only. Those costs matter for monthly comparison when they get rolled into the balance.

The Two Tests: Equity and Rental Coverage

A cash-out loan on a rental runs through DSCR underwriting. The lender tests rent against the full new payment, and on most files the appraisal includes a rent schedule (Form 1007 on single-family, Form 1025 on 2–4 units). Across the wholesale network, cash-out refinances top out around 75% LTV on standard rentals, with roughly 6 months of seasoning as the common expectation. Pricing and available terms vary by lender, borrower profile, property type, and full underwriting review. A DSCR of 1.00 is where select programs start. Stronger ratios open better pricing and leverage, and a separate select-lender path takes coverage below 1.00 with leverage and terms adjusted.

The investment-property HELOC is tested differently. It follows a personal-borrower standard: a credit floor of 700, a maximum 50% debt-to-income ratio, and a maximum 70% CLTV on investment property. The line caps at $500,000. There is no tier above that on an investment property. Lines at or below $500,000 usually run on an automated valuation instead of a traditional appraisal.

One caution on language. Clearing 1.00 on a DSCR file does not mean the property cash flows. Repairs, vacancy, management, utilities, and capex sit outside the calculation. DSCR compares rent to PITIA only.

A larger down payment or more equity lowers the payment and can lift coverage. It does not erase leverage caps, credit floors, reserve rules, or property eligibility. The strongest files clear both tests: enough equity and enough rental coverage. Program figures here reflect typical ranges across select wholesale-network guidelines, are subject to lender guidelines, and are not a commitment to lend.

Where the Second Lien Wins on Monthly Cost

The second lien tends to win when the existing first mortgage is better than anything a new first lien would offer. Keep it, and the low-cost debt stays in place. The new money sits on a separate line.

It also tends to win when the investor is sitting on an existing first-lien prepayment penalty. A cash-out refinance triggers that penalty as a real cost. A second lien leaves the first loan in force.

And it can win on size. Investment HELOC lines cap at $500,000 total, so the second lien suits smaller pulls against a property with meaningful equity. Above that, the cash-out is the tool.

Where the Cash-Out Wins

The cash-out tends to win when the existing first mortgage is expensive. Replace it, and the lower pricing applies to the whole balance.

It also wins on predictability. One payment. One term. No variable component if the new loan is fixed. No draw-period step-up to plan around.

It wins on entity structure too, which is the sharpest structural difference between the two. The network’s equity line requires title held by the individual borrower or a revocable living trust. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts cannot hold title on the line. A property already deeded into an LLC needs a vesting change, or the investor uses a DSCR cash-out instead, which can generally be done in an LLC, subject to lender program eligibility.

Finally, it wins on file simplicity for larger pulls. A line above $500,000 is available only on primary residences, so an investment property needing more than that goes the cash-out route.

Where the General Rule Breaks

The variable payment keeps moving. A HELOC that looks cheaper at origination can overtake a fixed cash-out payment if the index rises or the line moves into repayment. The CFPB’s comparison of home equity loans and HELOCs states that the payment varies with the outstanding balance, and that HELOCs usually have adjustable rates.

Interest-only is not a shrinking debt. During the draw, the payment covers interest and leaves principal unchanged. The monthly cost looks light. The balance is the same at the end of the draw as at the start.

The lender can stop advances. The FTC’s home equity guidance says that if you pay as agreed, the lender may not close the account, accelerate the balance, or change terms. The same guidance notes the lender may stop advances during any period when rates exceed the maximum rate in your agreement. A line is not a promise of access at all times.

Idle cash costs money on a cash-out. Interest starts on the full cash-out amount immediately, even if the next deal is months away. A line accrues interest only on what is drawn, though the 75% draw-at-closing rule on the network’s investment line narrows that edge.

Exposure limits. A borrower is limited to three lines, and an owner of more than 15 financed properties is not eligible. Investors with larger portfolios often land on the DSCR cash-out because the equity line is not available to them.

Property types. The equity line accepts single-family, 2–4 units, PUD, townhome, and condominium, including non-warrantable. It does not accept manufactured homes, co-ops, condotels, log homes, commercial, mixed-use, or agricultural zoning. DSCR programs in the network likewise do not offer manufactured homes (single- and double-wide), log homes, or barndominiums.

Availability. The equity line is available only in Lendmire’s 16 full-service states, which is narrower than the 41-market DSCR footprint. DSCR loans are available across the wider footprint.

Side-by-Side: What Changes on Monthly Cost

How the Decision Looks in Practice

Picture an investor holding a duplex bought years ago with a first mortgage priced well below today’s first-lien market. The investor needs a moderate amount for a staged renovation. Replacing the first would raise the cost on the whole balance. A second lien leaves that low-cost debt alone and puts new money on a separate line. This is the classic second-lien case, provided the investor holds title personally or in a revocable trust and meets the 700 credit floor.

Now run the opposite. Say you own a fourplex in an LLC with a first mortgage that is expensive relative to current first-lien pricing, and you want a large lump sum for the next purchase. The equity line cannot take LLC title without a vesting change, the line cap would limit the pull, and replacing the first lowers the cost on the whole balance. The cash-out wins on structure, size, and monthly math together.

A third case is a toss-up. The first mortgage is roughly at market, the amount is modest, and the investor holds personally. Here the tiebreakers are term reset and payment-step-up tolerance. The cash-out gives a known payment but resets the term. The line keeps the old term but adds a floating component with a repayment step-up ahead. Neither is clearly cheaper. Compare total interest and fees over the intended hold period, not the first month’s payment.

One operator-level observation: on files like these, the failed comparison is usually the one that only looked at the draw-period payment. The step-up at repayment is the number that should be in the plan before the line is opened, not discovered at the end of year five.

Common Mistakes

• Comparing a HELOC’s interest-only draw payment to a cash-out’s amortizing payment as if they were the same kind of number.
• Ignoring that a cash-out applies new terms to the entire balance.
• Assuming a second lien will be available on a property held in an LLC.
• Forgetting that a first-lien prepayment penalty is triggered by a refinance and left alone by a second lien.
• Treating a 1.00 DSCR as proof the property produces cash after expenses.
• Planning around the line as guaranteed access to funds.

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.

Related Reading

For the long-term-hold angle, see Lendmire’s piece Second-Lien HELOC vs Cash-Out Refinance for a Low Fixed Mortgage.

If you are weighing a home equity line against a cash-out refinance 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 arranging financing through select lenders in its wholesale network, and every file is underwritten individually.

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.

Investors weighing their equity options can start with Lendmire’s guide to cash-out refinance on an investment property.

References

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