Refinance Payoff Rules for Combining a First Mortgage and a HELOC

The Quick Read: When an investor “combines” a first mortgage and a HELOC, nothing is actually merged. A brand-new first-lien loan is originated, and its proceeds pay off both old liens at closing. On a rental, that new loan is usually a DSCR cash-out refinance, which qualifies primarily on property-level rental income covering the payment, subject to lender guidelines.

Key takeaways:

• Two loans are retired and one new loan replaces them, with new terms across the board.
• Any cash that returns to the borrower, or any HELOC balance rolled in, usually puts the file in the cash-out category.
• The new payment is tested against rent, so a bigger combined balance lowers coverage.
• A HELOC at a zero balance can still have a recorded lien and an open line until it is formally closed.
• LLC-titled rentals generally cannot hold a HELOC, which pushes those owners toward a DSCR cash-out.

Can You Combine a First Mortgage and a HELOC?

Not in the literal sense. There is no instrument that fuses the two notes. The refinance lender wants a single lien in first position, so it originates a new loan sized to cover the old first, the HELOC payoff, and closing costs. The settlement agent then sends payoff funds to both existing lenders.

That is why the payoff mechanics matter more than the “combining” label. Each old lender issues its own payoff figure, and the new loan has to be large enough to clear both. It also has to fit under the leverage ceiling and the rent test.

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 file turns on the property, not on the borrower’s pay stubs.

For the program basics, see the complete DSCR loans guide.

Key Terms Defined

Payoff statement: A written figure from a lender showing exactly what it takes to retire a loan on a given date, including interest accrued to that day and any fees.

Per diem: The daily interest added to a payoff for each day between the statement date and the actual payoff.

Subordination: A written agreement in which a junior lienholder, such as a HELOC lender, agrees to stay behind a new first lien.

Combined loan-to-value (CLTV): All liens on the property added together and divided by its appraised value.

Cash-out versus payoff-only: Payoff-only covers existing liens and closing costs. Cash-out means money comes back to the borrower, or a HELOC balance is rolled in, and tighter leverage limits apply.

Lien release: The recorded document showing a lender no longer has a claim on the property.

How Underwriting Treats the Payoff, Step by Step

Across the wholesale network, a combined payoff moves through the same sequence on almost every file.

1. Classify the transaction. A new loan that covers only the payoffs and closing costs is payoff-only. A loan that returns cash, or that retires a HELOC carrying meaningful balance, generally lands in cash-out. Lenders also look at what the HELOC funded and when the money was drawn.

2. Collect both payoff statements. The statement balance is not the payoff. A payoff includes accrued interest, any recent draws, annual or early-closure fees, and recording charges. It changes every day the line stays open.

3. Freeze the line. A new draw between the payoff letter and closing breaks the math. Ask the HELOC lender to freeze the line when the payoff is ordered.

4. Size the new loan. Appraised value caps the amount. Most cash-out files across the network top out around 75% LTV on a standard rental and 70% LTV on short-term-rental collateral. About 6 months of ownership seasoning is the common expectation.

5. Run the rent test. DSCR is monthly rent divided by the full monthly obligation: principal, interest, taxes, insurance, and any HOA dues. The test uses the new, larger payment. Many select programs start at 1.00 coverage, and stronger ratios open better pricing and leverage. A separate select-lender path goes below 1.00, with leverage and terms adjusted.

6. Pay off, then confirm the release. The settlement agent wires both payoffs. The investor’s last job is confirming that the HELOC lien release is actually recorded.

Credit is part of the same review. A 620 floor exists in parts of the network, most programs want around 660, and 700 or better unlocks the strongest leverage tiers. Reserves commonly run around 6 months of the monthly obligation, though they vary by lender, leverage, loan size, and transaction type.

One caution on the rent test: clearing 1.00 is not the same as positive cash flow. Repairs, vacancy, management, utilities, and capital expenses sit outside the calculation.

Pay Off, Subordinate, or Refinance Only the First?

Three paths exist when a HELOC sits behind a first mortgage. The right one depends on how big the HELOC is and how attractive the old first mortgage is.

Subordination works like this. Liens rank by recording date, so once the old first is paid off, the HELOC would move up to first position. The new lender will not accept that. The HELOC lender must sign to stay behind, and it has no obligation to do so. A cash-out makes consent harder, because the first-lien balance grows. The usual fallbacks are paying the line off, shrinking the new loan, or restructuring.

For owners who like their existing first, Lendmire’s piece Refinance vs HELOC for Combining a First Mortgage and a Second covers that tradeoff in more depth.

How a Combined Payoff Gets Classified

The classification decides which leverage ceiling applies, so it deserves its own look. In DSCR lending, the question is whether money leaves the closing table or a HELOC balance is being retired. A modest HELOC used to fund a prior purchase or improvement is treated differently by different lenders, and the answer depends on the program, the draw history, and the property.

Agency programs offer a useful contrast, though they do not govern DSCR files. Fannie Mae’s RefiNow document shows a narrow limited-cash-out lane. It requires 12 months of seasoning on the loan being refinanced and caps cash back at $250. It also permits new subordinate financing only when it replaces existing subordinate financing. DSCR programs set their own rules, and the network’s seasoning expectation on a cash-out is about 6 months.

Draw history is a second classification trigger. A non-agency program’s broker guidelines, filed in an SEC securitization disclosure, require 12 months of HELOC activity history for rate-and-term treatment. Recent draws can push the file into cash-out. That is one market program, not the network’s, but it shows why a line drawn heavily just before the refinance gets scrutiny.

Where the General Rule Breaks

LLC title. A HELOC through the network must be held by an individual borrower or a revocable living trust. LLCs, corporations, and partnerships cannot hold title. Moving a mortgaged property out of an LLC can trigger the due-on-sale clause. For an LLC-owned rental, the DSCR cash-out is the usual path, subject to program terms on entity borrowers.

A zero balance that is not closed. Paying a HELOC to zero does not end the line. The lien can stay recorded and the borrower can draw again until the account is formally closed. Signing the closure request at the time of the payoff, and checking the recorded release afterward, prevents the most common failure on a combined payoff.

Prepayment penalties on the old first. If the existing first is a DSCR loan with a prepayment structure, the exit fee is owed at payoff and comes out of proceeds. The new loan usually starts a fresh penalty clock.

Recent all-cash purchases. A long-held, free-and-clear property clears seasoning easily. A recent all-cash purchase is the file that most often gets sent back.

Ineligible property types. Manufactured homes (single- and double-wide), log homes, and barndominiums are not offered in the network’s DSCR programs, regardless of how much equity they hold.

Rent that cannot carry the balance. Equity is not always the binding constraint. Say a rental carries a first mortgage near 45% of value and a HELOC near 15%. Combined leverage of 60% sits well under the 75% cash-out ceiling for a standard rental. But if the old payment was low and the new loan resets a larger balance onto a full schedule, a property that covered the old first at roughly 1.5x might cover the new payment closer to 1.1x. Those ratios are illustrative modeling assumptions, not market data. The lesson holds, though. Run proceeds and coverage before applying. Final terms depend on the lender’s guidelines, the property type, and the borrower’s complete credit picture.

What the Investor Decision Looks Like

The cleanest case for combining is a modest first mortgage, a drawn HELOC with a payment that will step up, and a property whose rent clears the new payment with room to spare. The cleanest case against is a low legacy first mortgage. A cash-out reprices the entire first-mortgage balance, not just the HELOC slice. Keeping that first mortgage alongside a small HELOC is often the better answer, and the logic is laid out further in this piece on refinancing when you have a low first mortgage.

The HELOC route has its own constraints on rentals. NerdWallet reports that investment-property HELOCs come from a smaller pool of lenders, carry lower limits than primary-home lines, and typically run a 10-year draw followed by repayment of up to about 20 years. The network’s investment-property line differs. It tops out at 70% CLTV and $500,000, requires a 700 minimum credit score, and runs a 5-year draw with a 25-year repayment period, with pricing that floats throughout. The network offers these lines only in its 16 full-service states, narrower than its 41-market DSCR footprint, which includes Washington, D.C.

The other piece of sequencing is the exit. A future DSCR refinance will require any second lien to be paid off or subordinated. Plan that before opening a line, not after.

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.

Running the Numbers

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. Every figure is 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.

References

1. Fannie Mae RefiNow document

2. SEC ABS-15G exhibit

3. NerdWallet – Can you get a HELOC on an investment property?