The Quick Read: There is no single payment change, because the result depends on three things: the new combined balance, the new fixed rate on all of it, and the new term. A new first-lien loan pays off the old first mortgage and the home equity line of credit (HELOC) together, and the old payments disappear. If your HELOC is still interest-only, the new payment usually rises because principal is now included. If the HELOC is already amortizing, or your term stretches out, it can fall.
- Nothing is literally merged. One new loan is created and both old liens are released.
- The new rate applies to the entire balance, including the cheap first-mortgage slice.
- A low-rate first mortgage plus a small HELOC is the classic case where folding in costs you.
- On a rental, the new payment also has to be covered by rent, which is the DSCR test described below.
- Lendmire’s own HELOC lines float and never convert to fixed, so a fixed result comes from a refinance.
What Folding a HELOC Into a Fixed Jumbo Loan Really Does
You start with two loans on one property. One is a first mortgage with a fixed payment. The other is a HELOC, a revolving line secured by the same property, usually with a variable rate.
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.
Folding means a new, larger first-lien loan pays both off at closing. Title sends the money to both old lenders. You are left with one lien and one fixed payment.
“Jumbo” is a size label, not a special program. Any loan above the local conforming limit is jumbo. The FHFA’s conforming loan limit announcement sets that line, and Orrick’s summary puts it at $832,750 for one-unit properties in most counties. In high-cost areas the one-unit ceiling reaches $1,249,125.
Here is why that matters on a rental. A DSCR loan is not backed by those agencies at any size. DSCR stands for debt service coverage ratio, which is eligible monthly rent divided by the monthly housing obligation. That obligation is principal, interest, taxes, insurance, and any HOA dues, known together as PITIA. The conforming limit only tells you that a big combined payoff may land you in a larger loan bracket, which can change pricing and guidelines.
Why the Payment Moves: Three HELOC Stages
The old HELOC payment is not one number. It changes as the line ages, and the comparison depends on where you are.
Bankrate’s explainer describes the usual structure. The draw period is typically five, 10, or 15 years, with 10 the most common. The repayment period typically runs 10 to 20 years. During the draw you can pay interest only, which is the balance times the annual rate divided by 12. When repayment starts, the required payment includes principal.
| HELOC stage | What you pay today | Effect of rolling in |
|---|---|---|
| Interest-only draw | Interest only, looks small | New payment usually higher |
| Amortizing repayment | Principal plus interest, steep | Can fall if the term stretches |
| Balloon or line due | Lump sum owed | Folding in removes the cliff |
Much of the jump in the first row is not a cost. It is principal. You are paying down debt you were not paying down before. The old payment was low because it skipped that part.
The second row is where folding in most often lowers the payment. A 30-year fixed loan spreads principal over a long runway. A HELOC in repayment crams it into 10 to 20 years. The step-up when a draw period ends can be steep, which is why many borrowers start looking for a way out.
How to Compare the Old and New Payment, Step by Step
Do the comparison in this order.
1. Add up what you pay today. That is the first-mortgage principal and interest plus the HELOC payment, whether interest-only or amortizing.
2. Build the new balance. It is the first-mortgage payoff, plus the HELOC payoff, plus closing costs.
3. Apply the new rate to the whole balance. This is where people get surprised.
4. Apply the new term. Compute principal and interest on the combined balance over the new term.
5. Compare the two totals. Taxes, insurance, and HOA are the same on both sides, so they drop out of the comparison. They still sit in the DSCR denominator.
Step 3 deserves a closer look. Your blended rate today is a weighted average. Weight each loan by its share of the combined balance. Say the first mortgage is 85% of the total and the HELOC is 15%. Then your cheap first-lien rate carries 85% of the weight.
A new fixed rate on 100% of the balance replaces that blend. If the new rate sits above your old first-mortgage rate, you have repriced the large, cheap slice upward to retire the small, expensive one. A refinance reprices everything. A HELOC reprices only what you borrow.
That is the real cost of consolidating, and it is why the answer swings so much from borrower to borrower. A longer term pulls the payment down. A higher rate on a big legacy balance pushes it up. Which force wins depends on your numbers.
A Worked Picture, in Ratios
Dollar examples tend to mislead because every file differs, so here is the logic in ratios instead. Consider a rental where the first mortgage and HELOC payoffs together equal about 60% of appraised value. Closing costs add a little on top.
On a DSCR cash-out refinance of a standard rental, the ceiling across most of our network is around 75% LTV. For short-term-rental collateral, a cash-out tops out near 70%. A 60% combined payoff sits well inside either one. Every figure here varies by lender and program — guidelines, property type, leverage, and credit profile all apply.
Now the coverage test. Suppose eligible rent covers the new fixed payment at roughly 1.15x. That clears 1.00, which is where many select programs start. Stronger ratios open better pricing and leverage. A separate path takes coverage below 1.00 through select lenders in the network, with leverage and terms adjusted.
Now stretch the term. The same loan on a longer runway pushes coverage up, say toward the low 1.2 range, because the monthly obligation shrinks. Extended terms and interest-only periods are available through select lenders in the network. An interest-only period lowers the qualifying payment and then steps up, so judge the loan on both phases.
DSCR also is not profit. It compares rent to PITIA and nothing else. Vacancy, repairs, management, utilities, and capital expenses sit outside the calculation. A rental can clear 1.15x and still lose money in a bad month.
Closing costs set your break-even. Divide total closing costs by the monthly savings. The result is how many months you must hold the new loan to come out ahead. If there are no monthly savings, there is no break-even, and the move is about stability or access to capital rather than savings.
Four Paths to Compare
Folding in is one option. Before you commit, line it up against the others.
| Path | Payment effect | Term reset | HELOC outcome |
|---|---|---|---|
| Roll both into one fixed loan | Varies; new rate on all | Yes | Paid off, lien released |
| Convert the HELOC to fixed | Only the HELOC slice changes | Partly | Stays, locked in part |
| Refinance the HELOC alone | HELOC payment changes only | On the HELOC | Replaced |
| Keep both, refinance only first | First changes; HELOC stays | On the first | Needs subordination |
Subordination is the HELOC lender agreeing to stay in second position behind the new first loan. It sets repayment priority and, per Bills.com, does not itself change your monthly payments.
If you only want to refinance the first mortgage and keep the HELOC, you need that agreement. The CFPB notes that the HELOC lender may have to approve the refinance and can refuse. In that case you may need to pay off the HELOC to refinance, which brings you back to folding it in.
How Underwriting Treats the Combined Payoff
Across the DSCR programs we place files with, the pattern is consistent. Paying off a HELOC along with the first mortgage is generally handled as a cash-out refinance, even if no cash comes back to you. That means the cash-out leverage cap applies, not the higher purchase tiers. Roughly 6 months of seasoning is the common expectation, so a recently bought or recently refinanced rental may need to wait.
The file then moves in a predictable order.
1. Payoff letters. The first-mortgage servicer and the HELOC lender each issue one. Freeze the line so the balance stops moving.
2. Appraisal and rent schedule. A single-family rental gets a 1007 rent schedule. A 2-4 unit rental gets a 1025. Depending on the program, eligible rent is often the lower of the signed lease or the appraiser’s market-rent opinion.
3. Credit, reserves, and vesting. A 620 score floor exists in parts of the network. Most programs want around 660, and 700 or better unlocks the strongest leverage tiers. Reserves vary by lender, leverage, and size, and larger loans typically carry higher reserve requirements.
4. Closing and lien release. Timing varies by file and lender. Title pays both old lenders. Get written confirmation that the HELOC is closed and the lien released, so the line cannot be redrawn.
Standard DSCR loan sizes run up to $3,000,000 on standard programs (smaller balances available through select lenders). Above $2,500,000 the network generally holds to 30-year fixed structures. The 30-year fixed is the spine of the product. Interest-only periods, 40-year terms, and adjustable structures exist through select lenders for investors who want them.
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. If the rental sits in an LLC, a DSCR loan can often be written to that entity, subject to lender program eligibility.
Manufactured homes, log homes, and barndominiums are not offered in these programs. If your collateral is one of those, folding into a DSCR loan is off the table.
A broker view helps here. On files like these, the surprises are rarely the rate. They are the HELOC lender’s slow payoff letter, an undrawn credit limit nobody counted, or a rental purchased too recently to meet seasoning. A clean payoff package up front prevents most of them.
Where the Rule Breaks
The general pattern is simple enough. These edge cases are where it stops holding.
A low legacy first-mortgage rate. This is the strongest reason not to fold in. You would reprice a large, cheap balance to retire a small one. A standalone HELOC or a pay-down plan often wins.
A HELOC still in its interest-only draw. The payment looks tiny today, so any fully amortizing loan will look like a big jump. Compare against the amortizing version of the HELOC, not the teaser.
An undrawn credit limit. Combined loan-to-value (CLTV) on a junior lien is figured on the full limit, not just the drawn balance. Bills.com tells borrowers to add the new first mortgage to the full HELOC limit when checking it. An unused line still counts against you until it is closed.
A HELOC lender that refuses to subordinate. The fix is to pay it off through the new loan. That is the case where folding in becomes the only practical route.
Sub-1.00 coverage. If the larger payment pushes coverage under 1.00, financing is available through select lenders in the network, with leverage and terms adjusted. Expect less cash-out room and different terms.
A property deeded to an LLC. Lendmire’s HELOC placements require title held by an individual or a revocable living trust. An LLC-held rental generally points to a DSCR cash-out instead.
Seasoning. A rental owned for only a few months may not meet the roughly 6-month expectation. Waiting can open the door.
Where Lendmire’s HELOC Fits
If you are hoping to keep the HELOC and lock it, know this up front. The investment-property lines Lendmire places run on a 5-year interest-only draw followed by a 25-year fully amortizing repayment. Pricing floats through both phases and never converts to fixed.
The investment line caps at 70% CLTV on an investment property, with a 700 minimum credit profile and a $500,000 maximum line. There is no tier above that for investment lines. These lines also are available in a narrower set of states than the 41-market DSCR footprint, which includes Washington, D.C. All of it is subject to lender guidelines and full file review.
So a fixed payment on a rental generally comes from a DSCR cash-out or another refinance, not from the line itself. For a side-by-side of that choice, see Lendmire’s take on comparing a HELOC with a cash-out refinance on a rental. For the full picture of how DSCR programs work, the complete DSCR loans guide covers qualification and structures.
One more caution. A larger down payment, or in this case more equity, lowers the payment and can lift coverage. It never erases leverage caps, credit floors, reserve rules, or property eligibility. The strongest files clear both tests: enough equity and enough rental coverage.
When Folding In Does Not Make Sense
Skip it, or at least pause, in these cases.
- Your first mortgage carries a low fixed rate and the HELOC balance is small.
- Your rent would only just reach the new payment, leaving no cushion for vacancy.
- You expect to sell soon, before closing costs break even.
- You still need revolving access, since paying off a HELOC closes the line.
- The rental is an ineligible property type or fails seasoning.
Fold in when the HELOC payment is about to step up, the balloon is near, you want one predictable payment, and rent covers the new payment with room to spare. 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.
Key Terms Defined
CLTV (combined loan-to-value): Your first mortgage plus any HELOC, measured against the property’s value, using the full credit limit for the line.
Draw period: The early years of a HELOC when you can borrow and often pay interest only.
Amortization: Paying a loan down over time through payments that include principal.
Blended rate: The balance-weighted average of your current loans’ rates, used to compare against one new rate.
Subordination: A junior lender’s agreement to stay behind a new first loan in repayment priority.
Seasoning: The waiting period a lender expects between an event, such as a purchase, and a new loan.
PITIA: Principal, interest, taxes, insurance, and association dues, the full monthly housing obligation.
Frequently Asked Questions
Will my payment go up if I fold the HELOC into a fixed loan?
Often, if the HELOC is still interest-only, because the new payment includes principal. It may fall if the HELOC is already amortizing or the new term is much longer. A new rate on the whole balance can push the payment up even then.
Is this treated as a cash-out refinance?
On the DSCR programs we place files with, usually yes. Paying off a HELOC generally counts as cash-out even with no cash back. That means the cash-out leverage cap applies, which is around 75% LTV on a standard rental and around 70% on short-term-rental collateral.
Do I lose the HELOC?
Yes, if you pay it off through the new loan. The line is closed and the lien released, so you lose revolving access. Keeping it means a first-mortgage-only refinance with the HELOC lender’s subordination, which the lender can refuse.
Does the HELOC lender have to agree?
Only if you want to keep the line. If you pay it off at closing, you need a payoff letter rather than consent. Subordination is the step where the HELOC lender can say no.
How do I know if I break even?
Divide total closing costs by the monthly payment savings. That gives the months you must hold the loan. If the new payment is higher, the move has to be justified by stability, not savings.
Next Steps
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 broker arranging financing through select lenders in its wholesale network, and any illustrative calculator estimate is only that. Every file is subject to lender guidelines and review, 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.
Get Started
Ready to find the right loan for you?
In about 30 seconds you can review financing options available for your home or investment property. No commitment required.
Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
1. FHFA, conforming loan limit values (news release)
2. Orrick, FHFA announces increases to conforming loan limits
3. Bankrate, what is an interest-only HELOC
4. Bills.com, subordinating a HELOC to refinance
5. CFPB, does a HELOC affect my ability to refinance my first mortgage loan?
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 Tiers for a First-Time Equity Borrower on a Primary Home · How a HELOC Funds Four Years of Tuition for a Parent Borrower · How Much Home a First-Lien HELOC Down Payment Supports After DTI
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
- North Carolina Real Estate Broker · License# 343312 · Verify on NCREC
- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
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.