The Quick Read: A second-lien HELOC costs interest only on the money you draw, plus upfront and ongoing fees, while your low fixed first mortgage stays exactly as it is. A cash-out refinance reprices the entire first balance, which is where a low first rate gets lost. The right choice depends on how much you need, how long you hold it, and which property secures the line.
- The HELOC’s pricing applies to the drawn balance. A refinance’s pricing applies to everything.
- HELOC pricing floats and never converts to fixed on this network, so the payment can move.
- On an investment property, the network ceiling is 70% combined loan-to-value (CLTV), with a 700 minimum credit profile and a $500,000 maximum line.
- A HELOC is a personal-qualification product. It does not run on rental coverage the way a DSCR loan does.
- Title must sit with the individual or a revocable living trust, so LLC-held rentals do not fit.
This article explains what the second lien actually costs, how the underwriting treats it, and where the “keep the low first” logic breaks. The cost question looks simple. It has several layers.
How large a line the equity supports.
An equity line is sized by combined loan-to-value, occupancy, and credit — not by rental coverage. Switch the occupancy or the credit band and the ceiling moves with it.
Investment-property lines require a 700 minimum credit score; second-home lines start at a 640 minimum and primary-residence lines at 600, and the combined-LTV ceiling steps down as the credit band drops on primary-residence and second-home lines and holds on investment-property lines; the line cap steps down on primary-residence lines and holds at every tier on investment-property and second-home lines.
A debt-to-income ratio above 45% requires 680+ credit. Profiles under 640 are limited to single-family homes. At least 75% of the approved line is drawn at closing. Ceilings, floors, and caps update from Lendmire’s centralized guideline source.
Line estimate
Illustrative estimate only — not a quote, Loan Estimate, approval, or commitment to lend. The rate is an editable assumption; equity-line pricing is variable through both the draw and repayment periods and never converts to fixed. Occupancy and credit drive the ceiling together: an investment property tops out at 70% combined LTV (minimum credit 700, line cap $500,000); a second home tops out at 90% combined LTV (minimum credit 640, line cap $500,000), with the ceiling stepping down as the credit band drops (the cap holds at every tier); a primary residence tops out at 90% combined LTV (minimum credit 600), and its $750,000 maximum line is available only at 75% combined LTV or below with a 700-or-better credit profile (720 on the longer-runway program) and a full appraisal. Lines above $500,000 require a full appraisal. Credit, debt-to-income, property type, and full underwriting review all affect the final line.
What Is a Second-Lien HELOC, and What Does It Leave Alone?
A second-lien HELOC is a separate credit line recorded behind your existing first mortgage. The first loan keeps its balance, term, and fixed pricing. The new line sits in second position, which means the first lender is paid first if the property is ever sold under pressure.
That lien position matters for cost. The second lender takes more risk, so second-lien pricing generally runs above first-lien pricing. The offset is size. You pay that higher pricing only on dollars you actually draw, not on the whole debt stack.
Contrast that with a cash-out refinance. A refinance pays off the old first mortgage and writes a new one. Every dollar of the balance picks up the new pricing. If your existing first mortgage is far below what a new first lien would cost, you pay the market price on money you were already borrowing cheaply.
Across the wholesale network Lendmire works with, the HELOC product is a standalone line that can sit in first or second position. For a borrower with a low fixed first, second position is the whole point.
The Three Layers of Cost
Total cost has three parts: interest on the drawn balance, upfront fees, and ongoing or exit fees. Most comparisons look only at the first.
| Cost layer | When charged | What drives it |
|---|---|---|
| Interest | Monthly, on drawn balance | Index plus margin; floats |
| Upfront fees | At closing | Line size, valuation, title |
| Ongoing and exit | Annually or on closing the line | Lender terms; read the agreement |
Interest. The CFPB’s HELOC booklet explains that HELOCs generally carry a variable rate and that payments can change even if you draw no more money. Pricing is built from an index plus a margin. The booklet’s shopping checklist tells borrowers to compare the index, the margin, how often the rate adjusts, any cap and floor, and the length of the draw and repayment periods. Those are the right questions.
On this network the pricing floats across both the draw period and the repayment period and never converts to fixed. Plan for movement.
Upfront fees. These typically include valuation, credit report, title work, and recording. Lines at or below $500,000 ordinarily run an automated valuation with no traditional appraisal, though a higher CLTV may call for a secondary valuation. A borrower can also request a full appraisal. Lines above $500,000 require one, but investment lines cap at $500,000.
Ongoing and exit fees. Some lenders charge annual fees, minimum-draw requirements, or early-closure charges. Some advertise lower upfront charges and recover the money through pricing or an early-closure penalty. A line with no upfront fee is not a free line. Read the agreement for all of it.
Fees are usually a fraction of what a full refinance costs, because they apply to a smaller loan. That is a general pattern, not a quote. Individual files vary.
Does the Line Even Fit? Check This Before Pricing It
Eligibility comes before cost. A cheap line you cannot qualify for is not an option. The gates are occupancy, credit, combined leverage, and title.
On an investment property, the network ceiling is 70% CLTV. That holds at 700+ and at 720+ alike, with a 700 minimum credit profile and a $500,000 maximum line. There is no higher investment tier.
The figures differ by occupancy. Primary residences and second homes have more room. A second home runs from 640 credit upward, with a 90% CLTV ceiling that exists only at 720 or better, up to $500,000. A primary residence runs from a 600 floor, with the 90% ceiling again only at 720 or better, up to $500,000. Do not carry those numbers over to a rental. Occupancy decides which row applies.
CLTV math, not a quote. CLTV adds every lien and divides by value. Your first-mortgage balance counts against the ceiling. Picture a rental where the first mortgage already consumes most of the 70% allowance. The available line is whatever room remains. A borrower with a very low first balance relative to value has real room. A borrower who bought recently with high leverage may have almost none.
This is the hidden cost of “protecting” the first lien. It protects the rate. It does not create equity room.
Other gates worth knowing:
- Qualifying DTI tops out at 50%, and 45% for credit profiles from 600 to 679. The line is qualified on the interest-only payment calculated on the maximum draw.
- The line runs $25,000 to $750,000 overall, but investment lines top out at $500,000.
- At least 75% of the line is drawn at closing. That raises effective cost on a small line, since you carry interest on most of it from day one.
- After closing, the minimum subsequent draw is $1,000 on the longer-runway structure described below.
How Underwriting Treats the Line, Step by Step
Underwriting a HELOC works in a fixed order. Seeing it laid out explains why it feels different from a DSCR file.
1. Occupancy and title. Title must be held by the individual borrower or a revocable living trust. LLCs, corporations, partnerships, and irrevocable, blind, or land trusts cannot hold title. A property already deeded to an LLC needs a vesting change, or the better path is usually a DSCR cash-out.
2. Credit. The program reads a single-bureau score keyed to the primary wage earner. The report must be no more than 90 days old at closing, with no rescores. Rental investment lines need 700 or better.
3. Valuation and CLTV. Value is set, every lien is added, and the result is tested against the tier for your credit and occupancy.
4. Debt-to-income. This is where HELOCs and DSCR loans split. The HELOC looks at your personal DTI. A DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. The HELOC does not.
5. Property eligibility. Single-family, 2-4 units, PUDs, townhomes, and condominiums, including non-warrantable condos, are eligible. Manufactured homes, co-ops, condotels, log homes, and commercial, mixed-use, or agricultural-zoned property are not offered.
Exposure caps apply too. A borrower is limited to three lines, and a borrower with more than 15 financed properties is not eligible. Portfolio investors can hit that wall faster than they expect.
Draw Structures and What They Do to Cost
Two draw structures exist on primary residences and second homes. One runs a 3-year interest-only draw followed by a 17-year fully amortizing repayment. The other runs a 5-year interest-only draw followed by a 25-year repayment. Tennessee shortens both, to 3 and 12 years and 5 and 10 years respectively.
Investment lines run the 5-year draw and 25-year repayment structure only. The longer-runway structure is the one that carries the 5-year draw, so a quoted figure always has to be read against its own draw and repayment terms.
Interest-only draws feel cheap. They are not. As the CFPB booklet notes, nothing goes to principal during an interest-only draw, and when the repayment period begins the lender may require repayment over a set schedule or, on some plans, the whole balance can come due. The payment steps up at that point, and because the pricing floats, it can move again. Model that step before you draw. Do not discover it later.
Is there a break-even? Roughly: the longer you hold a large drawn balance, the more a refinance’s single, repriced payment starts to compete. The shorter the hold and the smaller the draw, the more the HELOC wins.
Keep the First or Replace It?
The decision turns on three inputs: the gap between your first-mortgage pricing and today’s first-lien market, the size of the draw as a share of total debt, and how long you hold the balance.
| Factor | Second-lien HELOC | Cash-out refinance |
|---|---|---|
| Existing first mortgage | Untouched | Replaced |
| What gets repriced | Drawn amount only | Entire balance |
| Payment behavior | Floats; steps up at repayment | Fixed on a fixed product |
| Review basis | Personal DTI | Depends on the loan type chosen |
| Upfront cost | Typically smaller | Typically larger |
The comparison is not one-sided. Keep the first when your rate sits well below what a new first would cost and the draw is modest. Replace it when you need a large sum, plan to hold the debt for years, or the property sits inside an LLC. A DSCR cash-out refinance tops out around 75% LTV across most of the network, which is more room than the 70% CLTV investment HELOC ceiling, though it reprices everything. A DSCR cash-out is reviewed primarily on rental coverage rather than personal DTI, subject to lender guidelines. Lendmire’s side-by-side look at a second-lien HELOC versus a cash-out refinance on a low fixed mortgage works through that tradeoff directly. Each figure is subject to lender guidelines and a complete review of property type, leverage, and credit.
Here is the thinking-out-loud version. A large draw against a very cheap first can still lose to a refinance, because floating pricing on a big balance, with a shortening repayment runway, can erode the advantage you thought you were protecting. For a small draw on a very cheap first, the HELOC almost always wins. The middle is a genuine toss-up and worth modeling both ways.
Small Lines and Fixed Fees
Fixed fees punish small lines. A flat fee spread over a $25,000 line is a bigger share of each borrowed dollar than the same fee over $400,000. Combine that with the 75% minimum draw at closing and a small line gets expensive per dollar used.
The reverse also holds. An undrawn line costs little beyond any annual fee, but on this structure you do not get a mostly-undrawn line, because most of it is drawn at closing. Do not plan on using the line as a standby reserve. It is a borrowing tool, not a cushion.
Reserves are a related trap. A HELOC balance is debt, not a liquid asset, and it generally does not stand in as reserves on the next purchase. Plan to hold real cash for DSCR reserves, which commonly run around 6 months of PITIA and vary by lender, leverage, and loan size.
Where the Rule Breaks: Edge Cases
Availability. HELOCs on rentals are scarce. Many big banks write home equity lines only on a primary residence. If you own the rental inside an LLC, the line is off the table until the vesting changes.
A HELOC funding a rental down payment. Some investors draw on a primary-residence line to buy a rental and pair it with a DSCR loan. That works mechanically, since a DSCR purchase typically runs 75%-80% LTV, with select high-leverage programs reaching 85% at roughly 700+. The risk is plain: you have secured the down payment with your home. Coverage matters here. Clearing 1.00 on a DSCR file compares rent to PITIA only. It is not the same as positive cash flow, because repairs, vacancy, management, and the HELOC payment all sit outside that calculation. A purchase that barely clears coverage and also carries a floating HELOC payment has very little room.
Prepayment penalties. DSCR loans often carry a step-down prepayment structure. If you plan to refinance out of an HELOC-funded purchase early, that penalty counts as a cost.
Texas primary residences. A Texas primary is a homestead and caps at 80% CLTV, with a 12-day waiting period, a one-lien-at-a-time rule, and 12-month seasoning. Those bind primary residences only. Texas second homes and investment properties are eligible as non-homestead transactions.
Listed properties. A property listed for sale, or listed within the past 60 days, is ineligible in Indiana, North Carolina, Pennsylvania, Tennessee, Texas, and Washington.
Credit history. Bankruptcy needs 4 years of seasoning from discharge or dismissal. Foreclosure-family history splits by program on primary residences and second homes. Investment files follow the 7-year foreclosure and 4-year deed-in-lieu or short-sale path.
Availability by state. This product is brokered only in Lendmire’s 16 full-service states: AL, CA, CO, FL, GA, IN, MI, MT, NM, NC, OH, PA, TN, TX, VA, and WA. That is narrower than the 41-market DSCR footprint, which covers 40 states plus Washington, D.C.
Tax. Tax treatment can depend on how the funds are used and how the property is held. The IRS rental property publication limits rental interest to loans that benefited the rental unit and excludes home equity loans used for personal expenses. Investors should keep clear records and speak with a qualified tax professional before relying on any deduction.
What an Experienced Broker Sees
Across the files Lendmire places, the HELOC-versus-DSCR question rarely turns on rate alone. It turns on title and structure. Investors who hold properties in LLCs discover late that a HELOC cannot attach, and the conversation shifts to a DSCR cash-out. Investors holding rentals personally, with a very low first and a modest cash need, are the ones the HELOC genuinely suits. Neither group should assume. Run the CLTV room first, then the cost.
For a deeper walk through the structure behind these loans, see the complete DSCR loans guide.
Key Terms Defined
CLTV (combined loan-to-value): Every lien on the property added together and divided by its value.
Draw period: The early stretch when you can borrow from the line and typically pay interest only.
Repayment period: The later stretch when borrowing stops and principal begins to amortize.
Index plus margin: The pricing build for a floating line, a benchmark rate plus a lender-set spread.
Lien position: The order in which lenders are paid, with the first mortgage ahead of a second-lien HELOC.
DSCR: Rental income divided by the property’s principal, interest, taxes, insurance, and any HOA dues.
Frequently Asked Questions
Does a second-lien HELOC change my existing mortgage rate?
No. The first mortgage keeps its balance, term, and fixed pricing. The new line is a separate loan recorded behind it, so only the drawn HELOC balance carries the line’s own floating pricing.
What is the maximum CLTV on an investment property HELOC?
On an investment property, the network ceiling is 70% CLTV, with a 700 minimum credit profile and a $500,000 maximum line. Your existing first-mortgage balance counts toward that figure, so the usable line is whatever room is left. Subject to lender guidelines and full file review.
Can I put a HELOC on a rental held in an LLC?
Not directly. A property already in an LLC needs a vesting change, or a DSCR cash-out may be the better fit, subject to program terms.
What happens when the draw period ends?
The payment steps up. Principal begins to amortize over the repayment period, and because pricing floats and never converts to fixed on this network, the payment can also move with the index. Model that step before drawing.
Is a HELOC or a cash-out refinance cheaper with a low first mortgage?
It depends on the draw size and how long you hold the balance. A small draw against a very cheap first usually favors the HELOC, since only the drawn amount is repriced. A large draw held for years can favor a refinance. Lendmire can compare options based on the property, equity, credit profile, and combined leverage.
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. Programs are brokered through select lenders in the wholesale network, and nothing here is a commitment to lend.
About Lendmire
Lendmire (NMLS# 2371349) is a mortgage broker. Home equity lines of credit — on a primary residence, a second home or an investment property — are arranged through wholesale lenders in Lendmire’s 16 full-service states, and every line is underwritten by the lender under its program guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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References
1. CFPB — What You Should Know About HELOCs
This article is part of Lendmire’s home equity line of credit program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: HELOC Fixed-Lock Options: Costs and How Many Locks You Get · VA Cash-Out vs HELOC for Debt When the First Mortgage Is Worth Keeping · Should an IO ARM DSCR Loan Replace a Low First Mortgage and HELOC?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Disclosures. The information presented in this article is general market commentary, not financial, legal, or tax advice. Lendmire is a mortgage brokerage (NMLS# 2371349) — not a direct lender or depository institution — and loan placement is subject to lender underwriting. Nothing in this content represents a commitment to lend. Loan terms, pricing, and program availability vary based on borrower qualifications, property characteristics, and state of subject property, and are subject to change at any time. Lendmire complies with Equal Housing Opportunity requirements. Consumer access: nmlsconsumeraccess.org.