The Quick Read: You cannot literally merge the two loans. A lender originates one new first-lien loan, and its proceeds pay off both your old mortgage and your HELOC at closing. On a rental, that is a cash-out refinance, and it has to clear leverage, credit, reserve, and rent-coverage tests, subject to lender guidelines.
- On a standard rental, cash-out refinance leverage tops out around 75% LTV across most of our wholesale network. Short-term-rental collateral caps at 70%.
- Expect about 6 months of ownership seasoning and a credit score of roughly 660 or better. A 620 floor exists in parts of the network.
- Rent has to cover the larger combined payment. That is a property test, separate from the equity test.
- The old first mortgage’s prepayment terms and the loss of a low existing payment are the two biggest reasons not to combine. These specifics are subject to lender guidelines and a full review of property, leverage, and credit.
What Does “Conventional” Mean for a Rental?
Strictly, a conventional refinance means a loan that follows agency conforming rules, the kind built for owner-occupied homes. Most investors who search this phrase want something simpler: one new loan that replaces a mortgage plus a HELOC on a rental. For a rental, the practical version of that is usually a DSCR cash-out refinance.
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.
DSCR stands for debt service coverage ratio. It compares the property’s monthly rent to the full monthly obligation: principal, interest, taxes, insurance, and any HOA dues. That obligation is called PITIA. 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.
The loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. Credit and reserves still matter. Lendmire is a broker, so it arranges these files through select lenders in its wholesale network across 41 markets, including Washington, D.C. It does not lend.
This article walks through how the refinance works, how underwriting treats each piece, the structures that exist, and where the rules break.
Key Terms Defined
Lien: a lender’s legal claim on a property until the debt is paid. A first lien gets paid before a second lien.
HELOC: a home equity line of credit. It is a revolving line, usually sitting in second position behind the first mortgage.
Subordination: a written agreement where the HELOC lender agrees to stay behind the new first mortgage instead of moving up.
LTV and CLTV: loan-to-value is the loan balance divided by appraised value. Combined loan-to-value adds every lien on the property together.
Seasoning: the waiting period a lender wants between buying a property and refinancing it.
Reserves: liquid savings a lender wants you to hold after closing, usually counted in months of PITIA.
Cash-out refinance: a new loan larger than what you owe, or one classified that way, so that equity is converted into proceeds or into payoffs.
How Does the Combination Actually Work?
The new loan is sized to pay off the first mortgage, pay off the HELOC, cover closing costs, and return any leftover cash to you. At closing, title sends payoffs to each old lender. Both old liens are released. One lien remains.
The HELOC is the reason this takes real structure. It is a junior lien. If you refinance only the first mortgage, your HELOC lender must either agree in writing to stay in second position or be paid off. Otherwise the HELOC would jump into first position, and no new first-lien lender will close behind that.
Here is the catch: the HELOC lender has no obligation to subordinate. Many won’t, especially when the refinance increases the first-lien balance. Paying the HELOC off inside the new loan removes the problem entirely.
Agency rules show the logic clearly. Fannie Mae’s Selling Guide classifies a refinance by what happens to the subordinate lien and sets resubordination requirements. Under that thinking, paying off a HELOC that did not fund the original purchase makes the transaction a cash-out refinance, even if no cash comes back to you. Agency rules do not govern DSCR files, though. Each DSCR program draws its own line between rate-and-term and cash-out. That is lender policy, not a federal rule, so the label on your file comes from the lender’s guidelines.
What Do Lenders Require on a Rental?
On most files in our network, the requirements come down to six checks. These are typical ranges, not promises, and every file is underwritten individually.
| Requirement | Typical range on a rental cash-out |
|---|---|
| Leverage | Up to about 75% LTV on a standard rental; 70% on short-term-rental collateral |
| Seasoning | About 6 months of ownership is the common expectation |
| Credit | 620 floor in parts of the network; about 660 on most; 700+ for the strongest tiers |
| Coverage | 1.00 is where many select programs start; stronger ratios open better terms |
| Reserves | Commonly around 6 months of PITIA, varying by lender, size, and leverage |
| Loan size | Up to $3,000,000 on standard programs |
A few notes on how those fit together.
Leverage includes both old balances. The new loan has to fit under the cap after paying the first mortgage and the full HELOC payoff. On a DSCR cash-out refinance of a standard rental at roughly 75% LTV, the first mortgage payoff, the HELOC payoff, and closing costs all share that one ceiling. That 75% belongs to the cash-out refinance only. A standalone investment-property HELOC runs a separate, lower ceiling of 70% CLTV. A heavily drawn HELOC eats room fast. Terms depend on the lender’s guidelines, the property type, the leverage, and a full review of the credit profile.
Coverage is tested on the new, larger payment. Many select programs start at 1.00, while a separate select-lender path takes coverage below 1.00 with leverage and terms adjusted. Consolidating a HELOC into a fully amortizing loan can raise the payment, so check coverage before you commit.
Clearing 1.00 is not positive cash flow. DSCR compares rent to PITIA only. Repairs, vacancy, management, utilities, and capital expenses all sit outside it. A property can clear coverage and still lose money in a bad month.
Reserves flex. Conservative rate-and-term files at modest leverage under $1,500,000 can see reserves waived. Loans above that size typically step up to about 9 months. Cash-out files lean toward the 6-month end of the range or higher.
Entity ownership. Rentals titled in an LLC can often be refinanced through DSCR programs, subject to program terms. Many home equity products cannot hold title that way, which comes up again below.
What Is the Step-by-Step Underwriting Sequence?
Underwriting follows a predictable order. Knowing it helps you avoid surprises.
1. Payoff statements. Title or the lender requests a written payoff for each lien. A HELOC payoff generally requires your signed authorization to close the line. Interest keeps accruing through the payoff date, so the number shifts.
2. Valuation. An appraisal sets the value ceiling. For a rental, it also includes a rent opinion. The appraiser uses Form 1007 for a single unit and Form 1025 for two to four units. Fannie Mae’s appraisal page names both forms. DSCR lenders use them as the standard way to document market rent.
3. Sizing. The lender takes the lower of what leverage allows and what rent coverage supports. If the property can’t cover the bigger payment, the loan shrinks, or the deal works to a different structure.
4. Credit and reserves review. The lender checks the score, housing history, and liquid reserves against the program tier.
5. Title and lien release. Title confirms both old liens will clear. Closing the HELOC formally matters, as the next section explains.
6. Funding and recording. The new first lien records. The old lenders release their claims.
That’s the whole sequence. No step is exotic, but each one can stall the file if a document is missing.
Where Does the General Rule Break?
Most of the surprises come from edge cases. These are the ones that show up most often in rental files.
Payoff-only versus cash-out. If the new loan covers only both payoffs and closing costs, some programs call it rate-and-term, which can come with a higher leverage cap or lighter reserves. Because most investor HELOCs never funded the original purchase, agency logic would call the same file cash-out. How a DSCR lender labels it is a policy question. Ask for the classification before you pay for an appraisal.
Stale payoff statements. HELOC interest accrues daily. If the payoff moves between quote and closing, leftover cash can appear or disappear, and a borderline file can flip from one label to the other. Build in a cushion.
A zero balance is not a closed line. Paying a HELOC to zero does not end it. Without a written request to close, an open line can leave a junior lien on title. Most lenders require closure at funding, or they require subordination.
A HELOC used to buy or rehab the property. Investors often draw a line as short-term acquisition or rehab money, then refinance out. That works, but documentation of how the funds were used matters, especially for the label. Seasoning also comes into play. A recent purchase with a fresh rehab may not meet the roughly 6-month expectation.
Keeping the HELOC instead. If your HELOC lender refuses to subordinate, the usual options are paying it off, shrinking the new loan, or restructuring. Cash-out refinances are harder to subordinate than rate-and-term ones because the first-lien balance grows. Combined leverage tests also commonly use the HELOC’s full credit limit, not just the drawn balance. An open, undrawn line still consumes room. That is general lender practice, so check how your file will count it.
Rental HELOCs are scarce. Few banks write a line on an investment property. Through select wholesale partners, Lendmire does place investment-property lines in 16 full-service states. Those top out at 70% CLTV on an investment property with a 700 minimum score, and a $500,000 maximum line. Investment lines run a 5-year interest-only draw followed by a 25-year repayment, and pricing floats rather than converting to fixed. The 16 states are narrower than the DSCR footprint.
Title held in an LLC. These home equity lines cannot be held in an LLC, corporation, partnership, or most trusts. Title must be in your name or an inter vivos revocable living trust. If your rental sits in an LLC, a DSCR cash-out is generally the cleaner route, depending on program guidelines.
Short-term-rental collateral. If the rental runs on a short-term basis, leverage drops. Cash-out on short-term-rental collateral tops out at 70% LTV, while a standard rental reaches about 75%. Expect a 640+ score and about 12 months of hosting history. Short-term rental rules can vary by city, county, HOA, and property type, so confirm local rules before relying on projected rental income. The exact numbers vary by lender and program and follow a full review of property, leverage, and credit.
Ineligible property types. DSCR programs in the network do not offer loans on manufactured homes (single- or double-wide), log homes, or barndominiums. If your property is one of these, the combined refinance is not available on it through these programs.
Hard money or bridge payoffs. These raise their own seasoning questions. They are a separate topic, but the same logic applies: the lender wants to see what the old loan was for.
Is Combining Worth It? A Decision Table
Combining is a tradeoff. You gain simplicity and a single fixed structure. You give up your old loan’s terms. Here is how the main options compare.
| Option | What happens | Fits when | Watch out |
|---|---|---|---|
| Combine into one cash-out | New first lien pays both | HELOC is large; payment structure is messy | Whole balance reprices |
| Refinance first only | HELOC stays, must subordinate | HELOC is small or undrawn | HELOC lender may refuse |
| Pay HELOC with cash | HELOC closes; first stays | You have liquid savings | Drains reserves |
| Keep both as is | Nothing changes | Low first loan; HELOC works fine | Variable draw-period pricing |
The honest call here depends on one number: the terms on your existing first mortgage. If it is a low fixed loan you could never replace, combining reprices the whole balance, not just the HELOC portion. That is the main reason not to combine. In that case, look at whether the HELOC can be paid down, refinanced alone, or left in place. Lendmire’s explainer Second-Lien HELOC vs Cash-Out Refinance for a Low Fixed Mortgage covers that comparison in detail.
If your first mortgage is already expensive, or the HELOC is large, variable, and near the end of its draw period, combining starts to look better. One fixed, fully amortizing structure replaces an interest-only line with floating pricing. The coverage ratio just has to work on the larger payment.
Scenario: Two Rentals, Two Different Answers
Consider an investor with two rentals. These are modeled situations, not market data.
Rental A carries a first mortgage that is old and low, plus a HELOC drawn to fund a renovation. The investor wants simplicity. After a roughly 75% LTV cap, the combined payoffs fit, but rent coverage on the new payment lands just under 1.00. The investor has two paths to review: a lower-leverage structure that brings the payment down, or a select-lender path that takes coverage below 1.00 with leverage and terms adjusted. Both are subject to lender guidelines and file review. Meanwhile the old first mortgage’s low payment is gone for good. The investor might decide to pay the HELOC down instead.
Rental B has a first mortgage near its original balance and a HELOC drawn to buy the property. The seasoning period has passed and rent clears 1.20x on the new loan. Combining retires an interest-only variable line and replaces two obligations with one fixed structure. Reserves cover roughly 6 months of PITIA. Here, combining looks strong.
Same idea, opposite answers. The difference is not the HELOC. It is the first mortgage and the rent.
What Does the Process Cost?
Expect appraisal and title fees, lender and broker costs, and recording fees. A new amortization schedule begins, so you start paying down principal from scratch.
Also check the old first mortgage for a prepayment penalty, a fee for paying the loan off early. Such a penalty typically applies only if you pay off the entire balance, such as in a refinance, within a set period, usually three or five years. The new loan can carry its own prepayment terms, which is more common on investor loans. Ask about both before committing. A penalty pushes out the point at which refinancing breaks even.
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.
Why Do Combined Refinances Get Delayed or Denied?
Four causes show up again and again.
- Equity shrinks at appraisal. Value comes in lower than expected, and the combined payoffs no longer fit under the leverage cap.
- A lien does not release. The HELOC was paid but never formally closed.
- Coverage falls short. The larger payment pushes the ratio under the program floor.
- Reserves fall short. Cash-out files often want more liquid savings than investors expect.
On files with heavy HELOC use, the payoff statements and the appraisal drive most of the movement. A broker who sees many lenders’ guidelines can often steer a borderline file toward the program whose overlays fit it, though the lender still makes every approval decision.
Does a Bigger Down Payment Help Here?
On a refinance, the equivalent is more equity left in the property. Lower leverage means a smaller loan, a lower payment, and a stronger coverage ratio. But more equity never erases credit floors, reserve rules, or property eligibility. The strongest files clear both tests: enough equity and enough rental coverage. DSCR loans are described in more detail in Lendmire’s complete DSCR loans guide.
What Should You Do Next?
Pull your payoff figures for the first mortgage and the HELOC, including the line’s full credit limit. Check the first mortgage for prepayment terms. Estimate current market rent against what the new, larger payment would be, and compare that to the 1.00 benchmark and any stronger tiers. Then decide whether the old loan’s terms are worth keeping.
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. Reach the team at 828-256-2183 or request a quote.
Frequently Asked Questions
Can I refinance my first mortgage and keep my HELOC?
Sometimes. The HELOC lender must agree in writing to stay in second position, and it has no obligation to do so. Cash-out refinances are harder to subordinate than rate-and-term refinances because the first-lien balance grows. If the lender refuses, the usual options are paying off the HELOC, shrinking the new loan, or restructuring.
Does paying off a HELOC make my refinance a cash-out loan?
Under agency logic, paying off a HELOC that did not fund the purchase makes the loan cash-out even if you receive no cash. DSCR lenders set their own classification rules, so the label depends on the program. Ask the lender how it will classify your file before you order an appraisal.
Can I combine the loans if my rental is in an LLC?
Often yes through a DSCR cash-out, depending on program guidelines. Home equity lines through our network cannot be held in an LLC. If your property is already deeded to one, a DSCR cash-out is generally the route that works without a vesting change.
Will the new loan reset my payment and my amortization?
Yes. The whole balance moves to a new loan with a new schedule. That helps when the old first mortgage was expensive or the HELOC was variable and interest-only. It hurts when the old first mortgage had terms you could not replace. Extended terms such as 40-year and interest-only periods are available through select lenders in the network, which can lower the payment and help coverage.
How much of my property’s value can I borrow against?
On a cash-out refinance of a standard rental, leverage tops out around 75% LTV across most of the network. A new investment-property HELOC runs up to 70% CLTV at a 700 minimum score, with a $500,000 maximum line. All figures are subject to lender guidelines and full file review.
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.
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References
1. Fannie Mae Selling Guide: Subordinate Financing
2. Fannie Mae: Appraisal and property underwriting resources
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: Should You Use a HELOC on a Paid-Off Home to Buy a Rental? · Is a HELOC a Bad Idea If You’re Near Retirement or on a Fixed Income? · Can You Keep a HELOC in Second Position Through a Refinance?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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Disclosure information. Lendmire is a state-licensed mortgage brokerage under NMLS# 2371349. Lendmire is not a depository institution, direct lender, or financial advisor — all loans referenced are placed through wholesale lender partners and are subject to each lender's underwriting standards. This article is provided for general informational purposes and is not a commitment to lend, nor does it constitute financial, legal, or tax advice. Loan programs, terms, rates, and qualification standards change without notice and depend on borrower profile, property type, and the state in which the subject property is located. Equal Housing Opportunity provider. NMLS Consumer Access: nmlsconsumeraccess.org.