Investment Property HELOC vs DSCR Cash-Out Refinance on a Duplex With One Unit Vacant

The Quick Read: On a duplex with one empty unit, a HELOC qualifies the owner personally and adds a second lien, while a DSCR cash-out refinance qualifies the building’s rent and replaces the first mortgage. The vacant unit hurts the HELOC through personal income and debt ratios, and it hurts the cash-out through the rent figure the lender counts.

• A HELOC on an investment property is capped at 70% CLTV in Lendmire’s network, with a 700 credit minimum and a $500,000 maximum line.
• A DSCR cash-out on a standard rental tops out around 75% LTV, with about 6 months of seasoning as the common expectation.
• A HELOC must be vested in an individual or a revocable living trust. A DSCR cash-out commonly allows LLC vesting, subject to program terms.
• A vacant unit is often counted at the appraiser’s market rent on a DSCR file. Programs treat it differently, so the rent evidence matters.

The honest answer is simple. A HELOC fits an owner who has a first mortgage worth keeping, strong personal credit and income, and a need for staged draws. A DSCR cash-out fits an owner who wants one lump sum, holds title in an LLC, or has a first mortgage worth replacing. Neither option is better in the abstract. The vacancy shifts the weight toward whichever test your file passes more cleanly.

Side-by-Side

The table shows published industry norms for both products, plus the parameters Lendmire’s wholesale network uses. Pricing is left out on purpose, because the calculator handles it.

Both columns are subject to lender guidelines and full file review. Programs differ, and none of this is a commitment to lend.

Key Terms Defined

DSCR is the monthly rent divided by the monthly principal, interest, taxes, insurance and any HOA dues.

CLTV is the combined loan-to-value ratio, which adds every lien on the property and divides by its value.

Market rent is the rent an appraiser estimates a unit would earn, whether or not a tenant is in place.

Draw period is the stretch when a HELOC borrower can pull funds, often at interest-only payments.

Seasoning is the minimum time you have owned or held a loan before a cash-out is available.

Rent-ready means the unit is in condition to be leased today, with no open repairs that block occupancy.

How a Vacant Unit Changes Each Test

A DSCR cash-out tests the building. A vacant unit still has a rent number, because the appraisal on a duplex uses the small residential income property report, Form 1025, which includes a market-rent opinion for each unit. Many programs count a vacant unit at that market rent. Some discount it, trim leverage, or want a signed lease first. The rent evidence for the empty unit is thinner than for the leased one, so the appraiser’s comps carry a lot of weight.

A HELOC tests you. The lender looks at credit, income and existing debts. In Lendmire’s network, DTI tops out at 50%, and the line is qualified on the interest-only payment calculated on the maximum draw, not on what you plan to borrow. A vacant unit usually lowers the rental income that can support that ratio, depending on the program. Your other income carries more of the load.

A Modeled Duplex, Rented and Then Vacant

Take a modeled duplex that covers its existing payment at roughly 1.3x with both units rented. Cash-out raises the payment, so the ratio falls even when the rents stay the same. If the cash-out is sized so the new payment lands near full coverage, both units rented might test around 1.1x. Now one unit goes vacant. If the program counts the empty unit at the appraiser’s market rent, the number may hold close to that level. If the program counts only leased rent, the ratio falls toward half the building’s income and may land well below 1.00.

Coverage under 1.00 is available through select lenders in the network, with leverage and terms adjusted. A common starting point for select programs is 1.00. These are different paths, and the file picks one. Smaller cash-out and a lease on the empty unit both move the number up.

Clearing 1.00 is not the same as positive cash flow. DSCR compares rent with the housing payment only. Repairs, vacancy loss, management, utilities and capital costs sit outside the calculation. A partly vacant duplex can pass the coverage test and still lose money every month.

When a HELOC Is the Better Fit

A HELOC works best when the first mortgage is worth keeping and the need for cash is staged. A line pays on the amount you draw, not the full limit, as the FTC explains. The draw period may require only interest on what you borrowed. That suits a renovation done in phases, such as rehabbing the vacant unit and then drawing again for a roof.

Network parameters on an investment line are narrow. The ceiling is 70% CLTV at a 700 minimum credit score. Above 700 you buy eligibility, not leverage. The maximum line is $500,000. An investment line uses a 5-year interest-only draw followed by a 25-year repayment, and at least 75% of the line is drawn at closing. Pricing floats during both periods and never converts to fixed. The CFPB notes that HELOC payments are often significantly higher once repayment begins. Investment lines at or below $500,000 ordinarily use automated valuation, so a traditional appraisal is often not required.

The limits matter on a vacant duplex.

• Title must be held by you personally or by a revocable living trust. A property already deeded to an LLC needs a vesting change first, or it points to a DSCR cash-out.
• Availability is limited to Lendmire’s 16 full-service states, which is narrower than the DSCR footprint.
• Many banks outside the network do not write lines on rentals at all, so product availability, not price, is often the first hurdle.
• A borrower is limited to three lines, and an owner with more than 15 financed properties is not eligible.

If your personal credit is strong, your DTI has room, and the title is in your own name, the HELOC keeps the existing first mortgage untouched. That matters if the old loan has a good term or a prepayment penalty.

When a DSCR Cash-Out Refinance Is the Better Fit

A DSCR cash-out works best when the building should carry the loan. It qualifies primarily on property-level rental income covering the payment, subject to lender guidelines, rather than on personal DTI. For the full picture of how these loans work, see Lendmire’s complete DSCR loans guide.

Across the wholesale network, a cash-out refinance on a standard rental tops out around 75% LTV, and about 6 months of seasoning is the common expectation. Most programs want a credit score near 660. A 620 floor exists in parts of the network, and 700 and above opens the strongest leverage tiers. Loan sizes run up to $3,000,000 on standard programs (smaller balances available through select lenders), and reserves commonly sit around 6 months of PITIA. They vary by lender, leverage, loan size and transaction type. Terms center on the 30-year fixed. Interest-only periods and 40-year terms are available through select lenders, and ARMs exist for investors who want them. Lendmire’s piece on how a cash-out refinance on an investment property works covers the mechanics in more depth.

The structure fits a vacant duplex in these cases.

• You hold title in an LLC, subject to program terms.
• You want one lump sum, such as a down payment on the next rental.
• Your first mortgage has an unattractive term, so replacing it is a plus.
• Your personal DTI is crowded by other debts, but the building’s rent is strong.

The trade-offs are real. A cash-out replaces the first mortgage and repays the old lien, so any prepayment penalty on the old loan comes into play. The new payment is larger, so coverage drops. A unit that is not rent-ready may complicate the file. The owner must not live in either unit, because an owner-occupied duplex is not a pure DSCR file.

Decision Table for the Vacant Duplex

Paperwork for the Vacant Unit

Clean documents give a lender fewer preventable gaps. For the empty unit, gather a few items.

1. Photos showing the unit is rent-ready, with any open repair items listed.

2. A listing or marketing record showing the unit is offered at a stated rent.

3. A signed lease if one exists, because the lender may count the lower of lease rent and market rent.

4. The leases and rent history for the occupied unit.

5. Insurance evidence that covers the full building.

6. The existing mortgage statement, plus any prepayment terms on the loan.

For a HELOC, add personal income records and statements for existing debts. For a DSCR cash-out, add entity documents if the property is held in an LLC and asset statements to support reserves.

Where Each Path Breaks

A HELOC file breaks when the title is in an LLC, the credit sits under 700, or DTI on the maximum draw runs too high. A DSCR file breaks when appraised market rent on the vacant unit comes in light, the new payment pushes coverage under the program minimum, or the old loan’s prepayment cost cancels the benefit. The fallback for a thin rent figure is a smaller cash-out, a lease on the empty unit before applying, or a select-lender path for coverage below 1.00 with leverage and terms adjusted. Manufactured homes, log homes and barndominiums are not offered in the DSCR network, so those are not fallbacks.

A Balanced Verdict

Pick the HELOC if your name is on the deed, your credit is 700 or better, and you want to keep a good first mortgage. Pick the DSCR cash-out if the building should carry the debt, title sits in an LLC, or you want one lump sum. If the empty unit is not rent-ready, fix it and lease it before testing either path. Tax treatment can depend on how the funds are used and how the property is held. Borrowers should keep clear records and speak with a qualified tax professional before relying on any deduction.

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. Lendmire arranges financing through select lenders in its wholesale network, across 41 markets including Washington, D.C.

About Lendmire

Lendmire, NMLS# 2371349, is a mortgage brokerage that arranges home equity lines of credit through wholesale lending partners in its 16 full-service states. Lines on primary residences, second homes and investment properties are each reviewed individually by the lender under the program’s occupancy, credit and combined-loan-to-value guidelines. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.

References

1. FTC – Home Equity Loans and Home Equity Lines of Credit

2. CFPB: What Is a Home Equity Line of Credit HELOC