The Quick Read: A fixed refinance does not change one payment. It replaces whichever loans the new first mortgage pays off, so the result depends on the rate, the term, and the combined balance you roll in, and a HELOC you keep floats on its own terms. Here is what to know before you run the numbers:
- If the new loan pays off the HELOC, you get one payment on a larger balance at the new first-lien terms.
- If the HELOC stays, the first-mortgage payment changes, but the line’s payment still moves with its own balance and index.
- A longer term lowers the monthly payment and resets the payoff clock, so a lower payment is not the same as a lower cost.
- On a DSCR file, folding the HELOC in raises the monthly obligation and lowers coverage. Keeping it stacks both payments against the same rent.
- Passing the coverage test does not mean the rental cash flows.
Key Terms Defined
DSCR (debt service coverage ratio) is monthly rent divided by the monthly payment on the property. A result of 1.00 means rent equals the payment.
PITIA is principal, interest, taxes, insurance, and association dues. It is the payment figure a DSCR test uses.
HELOC (home equity line of credit) is a revolving credit line secured by the property. It has a draw period and a repayment period.
Draw period is the stretch when you can borrow from the line. Payments in this phase are often interest-only.
Subordination agreement is a signed document in which a lien holder agrees to stay behind a new loan in priority.
CLTV (combined loan-to-value) is every loan on the property added together, divided by the property value.
Amortization is the schedule that pays a loan down to zero over a set term.
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 Actually Happens to Each Loan
A refinance never merges two loans. A new first-lien loan is originated, and its proceeds pay off the old first mortgage and, if you choose, the HELOC. The old loans are gone. A new note exists.
That gives you two main paths.
Path A: pay off the HELOC with the new loan. The variable-rate payment disappears. Its balance joins the new fixed first, so you carry one payment on a bigger balance. Lenders treat this as a cash-out-style transaction, because you are borrowing more than the old first mortgage balance. Across most of the wholesale network, a DSCR cash-out on a standard rental tops out around 75% LTV, and about six months of seasoning is the common expectation. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.
Path B: refinance the first and keep the HELOC. The new first is sized to pay off the old first only. The HELOC lender has to agree to stay in second position. Your first-mortgage payment changes. The HELOC payment does not change because of the refinance.
Many investors assume a fixed refinance fixes everything. It fixes only what it pays off.
The Three Levers That Move the Payment
Every change in the new payment comes from three things.
Rate. A new first lien is priced fresh. Your old first mortgage may have been better or worse than today’s pricing. The HELOC is variable, so its cost moves with an index. The new loan swaps that movement for a stable figure.
Term. A new 30-year fixed stretches the payoff. If your old first had 22 years left, a fresh 30-year schedule lowers the monthly payment partly because you owe for longer. That is the lever behind most payment drops.
Balance. Folding in the HELOC adds its drawn balance. Rolling in closing costs adds more. Cash taken out adds more still. A bigger balance pushes the payment up, and a longer term pushes it back down.
Quoted payment savings often come from the term lever alone. Separate the three, and you see what changed.
How to Rebuild the New Payment, Step by Step
You can do this on paper before any application.
1. List every lien. Write down the first mortgage balance, the HELOC drawn balance, the HELOC limit, and whether the line is in its draw or repayment phase.
2. Add the new balance. Take the old first payoff, add the HELOC payoff if it is being folded in, then add any costs you plan to roll in.
3. Pick the term. Compare a fresh long term against a term matching the years left on your old first. The second shows the real effect of rate and balance without the term reset.
4. Hold taxes, insurance, and dues constant. These do not change because of the refinance. Compare principal and interest to principal and interest.
5. Compare against the right baseline. Use the HELOC’s future repayment payment, not just today’s interest-only one.
A fast screening tool is the blended rate. It weights each loan’s rate by its balance. The larger balance dominates the result. It is a screen, not a payment, and it ignores fees and term.
Here is a modeled example, using assumed ratios rather than market data. Say a rental covers the first mortgage alone at roughly 1.30x. Add an interest-only HELOC payment and coverage slips to around 1.20x. Run the same rent against the HELOC once it starts amortizing, and coverage could fall toward 1.05x. A new fixed first that absorbs both on a long term might land near 1.15x. That looks like a loss against the first mortgage alone. It looks like a gain against the stacked, amortizing version.
| Starting point | HELOC after refinance | Payment direction |
|---|---|---|
| Low-cost first, small HELOC balance | Refinance the first, keep the HELOC | Usually stays put |
| Low-cost first, large HELOC balance | Folded into new first | Often rises on the first, falls versus stacked |
| Higher-cost first, any HELOC balance | Folded into new first | Often falls, mostly from the longer term |
| Any first, HELOC near end of draw | Folded into new first | Avoids the step-up, usually lower than repayment |
Treat the table as direction only. Your own balances and terms decide the result.
What Happens If the HELOC Stays?
The HELOC lender decides. Liens follow a first-in-time rule. When you refinance, the old first is paid off, so the recorded second moves up. Nolo explains that it then sits ahead of the new lender unless it signs a subordination agreement.
The new first-lien lender will not close behind a line that jumped ahead. So the HELOC lender either subordinates or the line gets paid off first. Some HELOC lenders decline. In that case you pay off the line with cash or with the new loan, which pushes you back to Path A.
If you do keep the line, remember it stays variable. A line placed through the wholesale network on an investment property carries a 5-year interest-only draw and a 25-year fully amortizing repayment. Pricing floats through both phases and never converts to fixed. The first-lien refinance gives you stability on the first mortgage only.
For a deeper look at the stacked outcome, see Lendmire’s piece How Much the Payment Changes When a HELOC Joins a Fixed First Mortgage.
The Baseline Trap: Interest-Only Today, Amortizing Tomorrow
Compare the new payment to the wrong baseline, and the answer looks better or worse than it is.
The CFPB’s HELOC brochure says some plans allow interest-only payments during the draw period, while others include some principal. When the draw ends, the plan moves to a repayment period, often over ten or 15 years, or the lender may require the whole balance at once. With a variable-rate plan, the brochure also notes that your monthly payments may change even if you borrow no more.
Interest-only does not mean the debt shrinks. The principal is still there, and it comes due. A refinance that looks like a payment increase against today’s interest-only line can look like a payment cut against the repayment schedule that is coming. This is why investors often refinance before the draw ends.
Stress-test the status quo too. If the index moves up, the variable payment moves up with it. A fixed first-lien payment does not. That difference is the real product you are buying.
How Does This Hit a DSCR Refinance?
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 test is rent against PITIA. Folding the HELOC into the first raises PITIA, so coverage falls. Keeping the HELOC means the lender looks at both payments against the same rent. Confirm how a given lender counts a second lien before you plan around it.
Coverage floors matter here. A 1.00 ratio is where many select programs start, and stronger ratios open better pricing and leverage. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted. Most files also want a credit score around 660, and 700 and above unlocks the strongest leverage tiers. Reserves vary by lender, leverage, and loan size, commonly around 6 months of PITIA. Every figure is subject to lender guidelines and full file review.
A larger equity cushion helps. It lowers the balance 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.
Clearing the ratio is not the same as cash flow. Repairs, vacancy, management, utilities, and capital expenses all sit outside the calculation. A property can pass and still run tight.
If you are weighing a new line against cash-out on a low-cost first, Lendmire’s comparison of a second-lien HELOC versus a cash-out refinance covers that choice directly.
Where the General Rule Breaks
The HELOC lender refuses to subordinate. You pay the line off first or with the new loan. Plan for this before you apply.
The rental sits in an LLC. A HELOC through the network must be held by an individual or a revocable living trust. LLCs, corporations, and partnerships cannot hold title on it. An entity-owned rental points toward a DSCR cash-out refinance, subject to lender program eligibility. Network HELOC availability is also limited to 16 states, narrower than the 41-market DSCR footprint.
Investment-line limits. On an investment property, a network HELOC caps at 70% CLTV, requires at least a 700 credit profile, and carries a maximum line of $500,000. There is no higher tier for investment properties. Higher ceilings you may see elsewhere describe the broader market, not this network.
Prepayment penalty on the existing DSCR first. Refinancing out of a DSCR loan early can trigger a penalty. Read the note before you start.
A second lien today limits tomorrow. Whoever holds your second gets a say in your next first-lien refinance.
Balloon or end-of-draw timing. If the line demands the full balance at once, the refinance becomes a deadline, not a choice.
Ineligible property types. Manufactured homes, log homes, and barndominiums are not offered in the network’s DSCR programs.
Costs, Break-Even, and What Stays Constant
A refinance carries closing costs. Roll them in, and they join the balance you pay interest on.
For break-even, compare the monthly savings to the total costs. If savings are small or negative, the refinance is a stability purchase, not a savings play. That can still be reasonable, but call it what it is.
Hold escrow items constant. Taxes, insurance, and dues do not move because of the refinance, so leave them out of the comparison.
On closing mechanics, you will need payoff statements for the first mortgage and the HELOC, a payoff letter or freeze request for the line, title work showing lien order, and the new note and security instrument. Confirm the lien release on any loan that is paid off. 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.
Is This Likely to Lower Your Payment?
Run these checks:
- Is your old first mortgage costlier than a new fixed loan would be? If not, a refinance may raise the first-lien cost.
- Does the new term extend your payoff? If so, expect a lower payment and more total interest.
- Is the HELOC near the end of its draw? If so, the baseline is the repayment payment.
- Can the HELOC lender subordinate? If not, you are on Path A.
- Does rent still cover the new payment at the coverage your target lender wants?
If most answers are no, keeping the first mortgage and leaving the HELOC alone may be the better move.
Frequently Asked Questions
Can I combine my first mortgage and HELOC into one loan?
Not literally. A new first-lien loan pays off both, and you carry the new loan. On an investment property, that is a cash-out-style refinance, so the standard cash-out leverage and seasoning expectations apply, subject to lender guidelines.
Will my payment go down?
It depends on rate, term, and balance. A longer term usually lowers the payment, while a bigger balance raises it. Against a HELOC about to start repayment, the new payment often looks lower.
Do I lose my low first-mortgage rate?
Yes, if you refinance the first. The whole balance gets repriced. If your first is already low, keeping it and leaving the HELOC in place may protect more value.
Can I keep my HELOC after refinancing?
Only if the HELOC lender signs a subordination agreement. If it declines, the line has to be paid off first.
What about the end of the draw period?
The payment can step up sharply once principal is added, or the lender may call for the full balance. Refinancing before the draw ends is a common way to avoid that.
Next Step
If you are weighing a fixed refinance against keeping a HELOC and want to see how the numbers work, Lendmire can help you compare options based on the property, the equity available, credit profile, combined leverage, and your goals. A good starting point is the complete DSCR loans guide. Every file is reviewed individually, 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. Nolo: What a Subordination Agreement Means
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: How Much the Payment Changes Folding a HELOC Into a Fixed Jumbo Loan · How to Qualify for a DSCR HELOC on an Interest-Only Rental · 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.