The Quick Read: Adding a home equity line behind a cheap first mortgage means the higher cost applies only to the money you borrow, while a cash-out refinance reprices the entire balance, so the line usually wins when your existing loan sits well below the current market. The tradeoff is a floating payment, personal-credit underwriting, and tight limits on rentals.
- A home equity line (HELOC) is a second loan recorded behind your first. It leaves the first loan’s rate, balance, and term alone.
- On Lendmire’s wholesale network, an investment-property line tops out at 70% combined loan-to-value (CLTV) and $500,000, with a 700 minimum credit profile.
- Your first mortgage still counts against you. It shrinks the room for the line and sits in your debt-to-income ratio.
- The line’s payment floats and never converts to fixed. The line is not a quiet reserve, because most of it is drawn at closing.
- A DSCR cash-out refinance is the replace-the-first alternative. It reads the property’s rent and can often be held in an LLC.
Plenty of investors bought or refinanced when money was cheap. That first loan is now an asset, and the real question is how to reach the equity without giving it up. This guide walks through the mechanics step by step. It then covers how the line is sized and underwritten, where the general rule breaks, and when replacing the first loan still makes more sense.
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.
Key Terms Defined
Second lien: a loan recorded behind your first mortgage. If the property is sold or foreclosed, the first lender is repaid first.
Combined loan-to-value (CLTV): your first mortgage balance plus the new line, divided by the property’s value.
Debt-to-income ratio (DTI): your monthly debt payments divided by your monthly income. A HELOC is underwritten largely on this number.
Draw period: the stretch when you can borrow from the line, often paying interest only.
Repayment period: the stretch after the draw period ends, when you pay principal and interest and can no longer borrow.
Subordination: a junior lender agreeing to stay behind a new first loan. It matters when you later refinance the first.
DSCR (debt service coverage ratio): monthly rent divided by the property’s monthly payment (principal, interest, taxes, insurance, and any HOA dues). A DSCR loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines.
What Does a HELOC Do to the First Mortgage?
It adds a loan without touching the old one. Your first mortgage keeps its rate, balance, and remaining term. The new line sits behind it and is priced on its own.
A cash-out refinance works the opposite way. It pays off the first loan and writes a new, larger one. Every dollar of debt, old and new, takes the new price.
The first loan is “untouched” only in one sense, because it still counts in two places. It counts in your combined loan-to-value, which sets how much line you can get. It also counts in your debt-to-income ratio, because the lender adds the first mortgage payment to the new line’s payment.
A cheap rate on the first does not buy you extra room. A smaller balance does.
Why Is a Cheap First Mortgage Worth Protecting?
The cost of keeping it is a blend. Take the first balance times its rate, add the line balance times the line’s rate, and divide by total debt. Then compare that blend to one new refinance rate on everything.
A higher rate on a small slice of debt can beat a moderately higher rate on the whole pile. Say your first mortgage is 80% of your total debt after the line. Only the remaining 20% carries the higher cost. A refinance would put all of it there.
The blend is only a starting point. Line costs, fees, remaining term, and the risk that the line’s rate rises all matter too. Because the line floats, the blend moves over time.
Many investors hold loans like this. Just over half of outstanding mortgages carried rates below 4% in the latest data Wolf Street reported, at 51.5%, though that share has been shrinking. Those are all-mortgage figures, not rental-only figures.
The comparison below shows how the two paths differ in structure.
| Factor | HELOC behind your first | DSCR cash-out refinance |
|---|---|---|
| Your first mortgage | Stays in place | Paid off and replaced |
| What gets repriced | Only the new money | The entire balance |
| Underwriting reads | Your credit, DTI, CLTV | The property’s rent vs. payment |
| Title | Individual or revocable trust | LLC possible* |
| Payment type | Floats; never fixed | Fixed or other term structures |
| Main risk | Rising, variable payment | Losing the cheap rate |
*LLC-titled borrowers are possible subject to lender program eligibility.
How Big a Line Can You Get?
Take the CLTV ceiling, multiply by the property’s value, and subtract the first mortgage balance. That is the room for the line, before the line cap applies.
Here are three first-balance scenarios on an investment property at the 70% ceiling, stated as shares of value:
| First balance (% of value) | Room for a line (% of value) |
|---|---|
| 30% | 40% |
| 50% | 20% |
| 65% | 5% |
The ceiling depends on how the property is used. Select lenders in the network tier it like this:
| Occupancy | Max CLTV | Credit and line limits |
|---|---|---|
| Investment property | 70% | 700+ credit; up to $500,000 |
| Second home | Up to 90% | 90% needs 720+; up to $500,000 |
| Primary residence | Up to 90% | 90% needs 720+; up to $500,000 |
Investment lines run no higher than 70%, with no tier above it. The 90% figure belongs only to primary and second homes at a 720-or-better profile. A primary residence can also carry a larger line, up to $750,000, but only at 75% CLTV with a full appraisal and a 700-or-better credit profile (720 on the structure with the longer draw period).
These ranges are guidance from select wholesale lenders, and every file is reviewed on its own. An investment-property line is $25,000 at the low end and $500,000 at the top. Eligible property types include single-family, 2-4 units, PUDs, townhomes, and condos, including non-warrantable ones. Lendmire’s piece on investment property HELOC terms when you keep a low first mortgage goes deeper on the line mechanics.
How Do Lenders Underwrite the Line, Step by Step?
A HELOC reads the borrower more than the building. A DSCR loan reads the rent against the payment. That difference drives most of what follows.
1. Credit. An investment line needs a 700 minimum credit profile. The lender uses a single-bureau score tied to the primary wage earner, and the report can be no more than 90 days old at closing.
2. Debt-to-income. The maximum is 50%, and a ratio above 45% requires at least a 680 score. The lender reviews your file on the interest-only payment calculated on the maximum draw, not the amount you plan to use.
3. Combined leverage. The lender adds your first balance to the line and tests the total against the 70% ceiling.
4. Valuation. Lines at or below $500,000 ordinarily use an automated valuation with no traditional appraisal. A higher CLTV may need a second valuation, and you can ask for a full appraisal anyway. Lines above $500,000 require one.
5. Title. The property must be held by you personally or by a revocable living trust. More on that below.
6. Exposure. A borrower can hold up to three lines. Combined exposure caps at $750,000 or $2,000,000, depending on the program. A borrower with more than 15 financed properties is not eligible.
Availability is also narrower than the DSCR footprint. HELOC files are limited to Lendmire’s 16 full-service states, while its DSCR investor loans cover 41 markets, including Washington, D.C.
How Do You Stress-Test the Floating Payment?
Start with the structure. Investment lines run a five-year draw period with interest-only payments. A 25-year fully amortizing repayment period follows. At least 75% of the line is drawn at closing, and pricing floats through both periods without ever converting to fixed.
That 75% rule changes how the line behaves. It is not a large unused reserve you tap when needed. Most of it is funded from the start, and interest runs on that balance. After closing, later draws carry a $1,000 minimum.
The CFPB describes a HELOC as an open-end line you can borrow against repeatedly, and warns that payments often rise significantly once repayment begins. Experian notes that many borrowers find payments more than double compared with interest-only. Because the rate floats, payments can also change in the draw period with no new borrowing.
A simple stress test has three steps:
- Run the payment at the interest-only level, then again at full repayment.
- Raise the line’s rate several steps and rerun both.
- Add the result to your first mortgage payment, then compare the total with the property’s rent.
Here is the point many investors miss. The line’s payment generally sits outside a DSCR calculation on a different loan, but it still comes out of the same rent. Clearing 1.00 on coverage also does not mean positive cash flow. DSCR compares rent to the payment only, and repairs, vacancy, management, utilities, and capital expenses sit outside it.
Does Your First Lender Get a Say?
Possibly, and this is where many plans stall. Check two things in your documents: the due-on-sale clause and any covenant limiting additional liens.
A federal statute, 12 U.S.C. §1701j-3, bars a lender from enforcing a due-on-sale clause just because you created a subordinate lien that does not transfer occupancy rights. That protection covers residential property with fewer than five dwelling units. Whether a business-purpose rental receives the same protection is unsettled, because the statute and its implementing regulation are worded differently. Have counsel read your note and security instrument before you rely on it.
Even where acceleration is barred, your loan documents may still carry a covenant against further liens. That is a contract issue, separate from the acceleration question.
The same logic works in reverse later. If you ever refinance the first, the line must be paid off or subordinated. The junior lender has no duty to subordinate. A cheap first can therefore limit your future refinance options.
Where Does the General Rule Break?
The general rule is that keeping the cheap first and borrowing behind it wins. These cases break it.
Title in an LLC. An LLC, corporation, partnership, or irrevocable, blind, or land trust cannot hold title on these lines. This is the sharpest difference from a DSCR loan. A property already deeded to an entity needs a vesting change or a DSCR cash-out instead. Moving title can itself be treated as a transfer under your first lender’s clause, so involve counsel before any deed change.
Five or more units. The statutory protection stops below five units, so your loan documents govern. This network’s lines also cover 2-4 units only. Lendmire’s piece Bank Statement HELOC for a 2-4 Unit Home and Your Low First Mortgage covers that property type.
Your first is itself a DSCR loan. It may carry an additional-lien covenant, a prepayment penalty, or both. Read the note before you assume a second lien is allowed.
Product labels. Some products sold under a DSCR HELOC label are really cash-out refinances that replace the first. Read the term sheet and confirm what happens to your existing loan.
Ineligible property types. Manufactured homes, co-ops, condotels, log homes, commercial and mixed-use property, and agricultural zoning are not offered on these lines. Barndominiums also fall outside the network’s DSCR programs.
Credit history. A bankruptcy needs four years of seasoning from discharge or dismissal. Foreclosure-family history on an investment file follows a seven-year path for a foreclosure and four years for a deed-in-lieu, pre-foreclosure, or short sale.
A fixed payment. Some borrowers want a fixed second lien. Those exist in the wider market, but this line never converts to fixed.
When Does a DSCR Cash-Out Refinance Win Instead?
Replacing the first can be the better move when several of these conditions line up:
- The equity you need exceeds what 70% CLTV and a $500,000 line allow.
- The property sits in an LLC, subject to lender program eligibility.
- Your personal debt-to-income ratio is too tight, but the rent is strong.
- The first loan’s rate is not far below current options, so little is lost by replacing it.
- You want a fixed payment structure, or a longer term.
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.
A DSCR cash-out tops out around 75% LTV on standard rentals, with about six months of seasoning as a common expectation. Short-term-rental collateral generally caps lower, at 70% on a cash-out. Coverage of 1.00 is where many select programs start. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted. Most programs want a score near 660, and 700 or higher opens the strongest leverage tiers. Reserves commonly run about six months of PITIA, though they vary by lender, loan size, and transaction.
Cash-out uses the same equity, but it resets the rate on the whole balance. Whether that trade is worth it depends on how far your first loan sits below the market, how much cash you need, and how long you plan to hold. Lendmire’s complete DSCR loans guide lays out how those programs work.
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.
What Should You Do Next?
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 mortgage broker that arranges financing through select lenders in its wholesale network. It is not the lender, and every figure here is subject to lender guidelines and full file review.
Gather these before a conversation:
- Your first mortgage note, security instrument, and current payoff statement.
- Title or vesting documents showing who holds the property.
- An estimate of the property’s value.
- Your credit profile and your monthly debt payments.
- The amount you need, when you need it, and how long you plan to hold.
Frequently Asked Questions
Does a HELOC change my first mortgage?
No, the first loan keeps its rate, balance, and term. The line sits behind it as a second lien. The first mortgage still counts in your combined loan-to-value and your debt-to-income ratio, so it limits how large a line you can get.
Can I use a HELOC on a rental property?
Yes, through select lenders in the network, within narrow limits. An investment line caps at 70% CLTV and $500,000, with a 700 minimum credit profile. The property must be held by you personally or in a revocable living trust. An LLC cannot hold title, and the product is limited to Lendmire’s 16 full-service states.
Can I borrow less than the full line?
Only partly. At least 75% of the line is drawn at closing on these programs. Later draws carry a $1,000 minimum after closing. If you want a small amount, a smaller line is usually the better fit.
What happens when the draw period ends?
Payments step up. Investment lines run a five-year interest-only draw, followed by a 25-year amortizing repayment period. Pricing floats through both periods and never converts to fixed, so plan for a higher payment before repayment starts.
Do I need to tell my first lender?
Check your documents first. Look for due-on-sale language and any covenant against additional liens. Federal law limits acceleration for a subordinate lien on residential property under five units. Whether a business-purpose rental gets the same protection is unsettled, so ask counsel before you proceed.
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.
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References
1. Wolf Street – Below-4% Mortgage Share
3. Experian – What Is a Draw Period on a HELOC?
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: Can You Cash Out a Condotel With a Super Jumbo DSCR Loan? · Can a Condo Building in Litigation Still Get a Rental HELOC? · How to Borrow Against a Free-and-Clear LLC-Owned Rental
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Required disclosures. Lendmire (NMLS# 2371349) operates as a licensed mortgage broker, not a direct lender or depository. The discussion in this article is general in nature and should not be relied upon as financial, legal, or tax advice — every investment scenario is unique and should be reviewed by a qualified professional. Any loan inquiry is subject to lender underwriting, and this article is not a commitment to lend or a guarantee of approval. Mortgage rates, loan terms, and program guidelines vary by borrower, property, and state, and may change without notice. Equal Housing Opportunity. Verify licensure at NMLS Consumer Access.