The Quick Read: The amount a duplex can borrow is set by the lowest of three limits: the leverage cap on the purchase price or appraised value, the amount the combined rent of both units supports at the program’s coverage floor, and the program’s loan-size band. On many files, the rent limit binds before your down payment does. Underwriting reads both units together, so a duplex often covers its payment better than a comparable single-family home. Everything below is subject to lender guidelines, and none of it is a commitment to lend.
- On a purchase of an investment property, most files land at 75%-80% LTV.
- Rent coverage of 1.00 is where many select programs start, and stronger ratios open better terms.
- The appraiser’s market-rent opinion, not your hoped-for rent, drives the coverage number.
- Clearing 1.00 is not the same as positive cash flow.
Which Wilmington Is This About?
The math is identical whether your duplex sits in Wilmington, Delaware or Wilmington, North Carolina. Leverage caps, coverage tests, and loan bands come from the loan program, not the zip code. The local inputs that change are the rent, the tax bill, and the insurance quote. This article uses “Wilmington” as a label for any two-unit rental and does not rely on local market figures.
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Rate source: Freddie Mac 30-yr average via FRED® — Federal Reserve Bank of St. Louis · effective Oct 29, 2026
Prefilled with starting assumptions — enter your own rent or nightly figures, taxes, insurance, and HOA for a more accurate picture.
Program parameters update from Lendmire’s centralized guideline source. Taxes and insurance are editable estimates.
As of Oct 29, 2026 · General Freddie Mac market benchmark, not a Lendmire loan offer. Rent, nightly rate, occupancy, taxes, and insurance are editable estimates. Short-term rental figures are estimates only and vary significantly by season, property type, management approach, and local short-term-rental rules — confirm local regulations before relying on them. Qualifying income for short-term rentals varies by program — some use appraisal market rent, others use documented STR history or projections — and is confirmed in underwriting. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
What Does “Lends” Actually Mean on a Duplex?
“Lends” means the largest loan that passes every test at once. Each test produces its own maximum, and the smallest of those maximums is your loan. The tests are separate because each one protects the lender from a different risk.
| Test | What it limits | Typical driver |
|---|---|---|
| Leverage cap | Loan vs. value | Price or appraisal |
| Coverage test | Loan vs. rent | Rent, taxes, insurance |
| Program band | Loan size | Dollar min and max |
Many investors assume the down payment is the only lever. In practice, a strong-credit investor with plenty of equity can still be capped by rent that is too low for the loan requested. Equity and rent coverage are two separate gates. The strongest files clear both.
How Does Underwriting Build the Duplex Rent Number?
The rent figure comes from the appraisal. For two- to four-unit properties, the appraiser uses the small residential income property report, known as Form 1025. It gives a market-rent opinion for each unit. Lenders borrow that form by convention, even though agency rules do not govern these loans.
The two unit rents add up to one gross figure. When a unit is leased, many programs credit the lower of the signed lease and the appraiser’s market rent. When a unit is vacant, the underwriter generally relies on market rent alone. A few lenders in the network treat leases a little differently, so treat this as typical, not universal.
| Unit situation | Rent usually used |
|---|---|
| Leased at or below market | The lease |
| Leased above market | Often the market rent |
| Vacant | Appraiser’s market rent |
| Commercial space in the building | Generally excluded |
Your own pro forma does not count. If you plan to raise rents after closing, that upside stays outside the coverage test.
How Is the Monthly Payment Built?
The payment in this test is PITIA, which stands for principal, interest, taxes, insurance, and association dues. DSCR is the monthly rent divided by that full payment. At 1.00, rent equals the payment. Above 1.00, rent covers it on paper, and below 1.00 it does not.
Taxes and insurance sit in the denominator, so they move the answer as much as rent does. Two identical-price duplexes can support different loans because one has a heavier tax bill or a pricier insurance quote. Shopping the insurance quote early is one of the more affordable ways to improve the number.
Interest-only structures are tested on interest, taxes, insurance, and dues instead. That lowers the tested payment, although some programs trim leverage when you choose it.
How Do You Back Into the Maximum Loan?
Work backward from the rent. This reverse math shows which limit binds before you make an offer.
1. Add the two unit rents as the underwriter would count them. 2. Divide that rent by the program’s required coverage, such as 1.00 or a stronger target. The result is the maximum monthly payment. 3. Subtract taxes, insurance, and any association dues. What remains is the most the principal-and-interest payment can be. 4. Convert that payment into a loan size using the term and pricing on your quote. 5. Compare that loan with the leverage cap on price or appraised value. The smaller number is your ceiling. 6. Check the program band. Standard programs run up to roughly $3,000,000, and smaller balances route through select lenders in the network.
If step 4 produces a bigger number than step 5, equity is your limit. If step 5 is bigger, rent is your limit, and a larger down payment or a better rent case is the fix.
Where Does the Leverage Cap Land?
On a purchase of an investment property, most programs in the network land at 75%-80% LTV, which means 20%-25% down. Select high-leverage programs reach 85% LTV, or 15% down, usually with a score around 700 or higher. LTV is the loan divided by the lower of the purchase price or appraised value, so a low appraisal shrinks the loan even when the contract price is higher.
On a cash-out refinance of a standard rental, the ceiling is around 75% LTV, and most lenders expect about six months of seasoning, meaning you have owned the property that long. Short-term rental collateral sits lower: the cash-out ceiling is 70%, and purchases top out at 75%. Those files also 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 investors should confirm local rules before relying on projected rental income. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.
What Does the Sizing Look Like in Numbers?
Take a modeled duplex that covers its full payment at 1.20x. These are illustrations only, not market data. Each row changes one input and shows the effect on coverage.
| Change | New coverage |
|---|---|
| Starting point | 1.20x |
| Rent falls 10% | 1.08x |
| Rent falls 20% | 0.96x |
| Taxes and insurance lift payment 10% | about 1.09x |
| Bigger down payment trims payment 10% | about 1.33x |
The 20% rent drop is the instructive row. A file that clears 1.00 comfortably can slip under it with a moderate rent shortfall. Programs that start at 1.00 would then shrink the loan or ask for more down, and a separate select-lender path takes coverage below 1.00 with leverage and terms adjusted.
Appraisal risk is double on a duplex. A low value shrinks the leverage-based loan, and a low rent conclusion shrinks the coverage-based loan. Lendmire’s piece How Much a DSCR Loan Lends on a Tallahassee Duplex shows the same interplay on another two-unit file.
When Does a Duplex Get Sized Down?
The common reasons are predictable. Knowing them before you write an offer saves you a surprise.
- Low rent conclusion. The appraiser’s market rent comes in under the lease or your expectation.
- Heavy taxes or insurance. These shrink the room left for principal and interest.
- Low value. The appraisal lands under the contract price, so the leverage cap applies to a smaller number.
- Weak credit tier. Around 660 is what most programs want, 620 is a floor in parts of the network, and 700+ unlocks the strongest leverage.
- Thin reserves. Reserves are commonly around 6 months of PITIA. Conservative rate-and-term files at modest leverage under $1,500,000 can see them waived, and larger loans typically step up to about 9 months.
The levers are the ones you would expect. You can put more money down, choose a lower-payment structure, document rent better, or shop insurance and tax estimates. The network’s term menu is built around the 30-year fixed. Extended terms, such as 40 years, and interest-only periods come through select lenders, and adjustable structures exist for investors who want them. Above $2,500,000, the network generally holds to 30-year fixed structures.
Where Does the General Rule Break?
Several edge cases change the answer.
- A partly vacant duplex. The empty unit is credited at the appraiser’s market rent, not at zero, but the lender will look closely at the leased unit’s paperwork.
- Commercial space in the building. Commercial income generally sits outside the residential rent schedule and is not blended into the coverage rent.
- Short-term rental use. The standard rent schedule was built for monthly leases, so these files use different methods and lower leverage, as described above.
- Owner-occupied duplexes. If you plan to live in one unit, you are on an owner-occupied path, not a standard investor file. These 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.
- Five or more units. These move to commercial-style underwriting, so this test no longer applies.
- Property types not offered. Manufactured homes, log homes, and barndominiums are not offered in the network’s DSCR programs.
- Coverage below 1.00. This is available through select lenders in the network, with leverage and terms adjusted. A no-ratio path exists only through select lenders, generally for borrowers who already own a primary residence.
Loans on one- to four-unit rentals typically use gross rent divided by PITIA. Other sources may define coverage differently, so confirm which definition a source uses before you compare figures.
Is Clearing 1.00 the Same as Making Money?
No. DSCR compares rent to PITIA only. Repairs, vacancy, management fees, utilities, and capital expenses sit outside the calculation. A duplex can clear 1.10 and still lose money in a bad year, so keep your own cash cushion. Qualification runs on property-level rental income covering the payment, subject to lender guidelines. It is a measure of coverage, not profit.
DSCR vs. conventional financing
There are two common ways to finance an investment property, and they qualify you differently — here’s how investors weigh them.
Why investors choose it
- Qualifies on the property’s rental income — no personal tax returns, W-2s, or pay stubs needed to document income.
- No personal debt-to-income ceiling to clear, so existing mortgages and obligations don’t cap your borrowing the same way.
- Can be closed in an LLC, keeping the property inside a business entity.
- Built for scaling — not held to the limit on number of financed properties that conventional financing applies.
- Underwriting centers on the deal: generally qualifies when the rent covers the payment, a 1.00x coverage ratio being a common baseline (confirmed in underwriting).
- Designed specifically for investment property, including long-term and, where the program allows, short-term rentals.
Where it’s strong
- Often the lowest ongoing financing cost for a buyer who fully qualifies on personal income — a fit for a first property or a cost-first purchase.
Trade-offs for investors
- Requires full personal income documentation and must fit within a debt-to-income limit — salary, existing debts, and other mortgages all count.
- Typically held in your personal name rather than a business entity.
- Caps how many financed properties you can carry, which can become a ceiling as a portfolio grows.
- Evaluates you as a borrower as much as the property, which usually means more paperwork.
How investors usually choose: a first or single property often optimizes for the lowest financing cost; portfolio builders often optimize for leverage, vesting in an LLC, and scaling past conventional caps. The right answer depends on your goals, the property, and current guidelines — both paths run through select lenders in Lendmire’s wholesale network, with eligibility and terms confirmed in underwriting.
Why Doesn’t the Conforming Loan Limit Cap This?
Agency loan limits apply to agency loans. The FHFA conforming loan limit sets the cap for loans sold to the government-sponsored enterprises, and investor loans like these are non-QM, business-purpose loans that are not sold that way. That is the reason sizing here follows leverage, coverage, and the program band, not an agency number.
Key Terms Defined
DSCR (debt service coverage ratio): the property’s monthly rent divided by its full monthly payment.
PITIA: principal, interest, taxes, insurance, and association dues, the payment used in the coverage test.
LTV (loan-to-value): the loan amount as a percentage of the lower of price or appraised value.
Seasoning: how long you have owned a property before a lender will refinance it on cash-out terms.
Reserves: liquid funds, counted in months of PITIA, that you hold after closing.
Non-QM: a loan outside standard owner-occupied mortgage rules, underwritten on its own program guidelines.
What Should You Do Before You Write the Offer?
Run the reverse math first. Gather both units’ lease terms, a realistic insurance quote, and the tax bill. Decide whether you are targeting 75%-80% LTV or a higher-leverage program, and check your credit tier against it. Then see which limit binds. If rent binds, adjust the offer price or the down payment, not your expectations of the lender. Exact terms depend on the lender’s guidelines, property type, leverage, and a full review of the borrower’s file.
Tax treatment varies; consult a qualified professional before relying on any deduction.
If you are buying or refinancing a rental property and want to see how the numbers work, Lendmire can help you compare DSCR loan options based on the property income, credit profile, leverage, and investor goals. Lendmire arranges these loans through its wholesale network, covering 41 markets, including Washington, D.C. For the full picture, read the complete DSCR loans guide.
Frequently Asked Questions
Is there a legal maximum on a duplex loan like this?
No. The conforming limit applies only to agency loans. The practical limits are the leverage cap, the rent coverage test, and the program’s size band, which runs up to roughly $3,000,000 on standard programs.
Does a bigger down payment always raise the loan I can get?
Not by itself. A bigger down payment lowers the payment and can lift the coverage ratio. It never erases credit floors, reserve rules, leverage caps, or property eligibility.
Which rent counts on a duplex, the lease or the appraisal?
Many programs credit the lower of the signed lease and the appraiser’s market rent for each unit. A vacant unit is generally credited at market rent. Treat this as typical, since each program sets its own method.
Do I need tax returns or W-2s?
Generally no. Qualification runs on the property’s income, not personal income documentation. Credit, reserves, the appraisal, and entity documents are still reviewed. An LLC can hold title, subject to program terms.
What credit score do I need?
Around 660 is what most programs want, and a 620 floor exists in parts of the network. A score of 700 or higher unlocks the strongest leverage tiers, including select programs that reach 85% LTV on a purchase.
For current guidelines and terms, see Lendmire’s DSCR loan programs page.
About Lendmire
As a non-QM mortgage broker (NMLS# 2371349), Lendmire facilitates DSCR investor loans across 41 markets, including Washington, D.C. DSCR eligibility is generally reviewed around property-level rental income instead of personal income documentation, subject to lender guidelines, serving LLC-structured portfolios and self-employed borrowers who don’t fit conventional boxes. A two-time Scotsman Guide Top Mortgage Workplace (2025, 2026).
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References
1. Fannie Mae Selling Guide B4-1.2-01 (Form 1025)
This article is part of Lendmire’s DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: How to Refinance a Rental for a Lower Payment With a DSCR Loan · How Much a DSCR Lender Lends on a St. Petersburg Rental · How Much a DSCR Cash-Out Refinance Lends on a Gatlinburg Cabin
Guides: DSCR Loans in Delaware
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
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- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Legal disclosures. Lendmire (NMLS# 2371349) is a state-licensed mortgage brokerage that arranges financing through wholesale lender relationships. Lendmire is not a direct lender, depository institution, or registered financial advisor. The discussion above is general informational content about real estate financing — it is not financial, legal, or tax advice, and readers should consult licensed professionals for guidance on their individual circumstances. Loan inquiries are subject to lender underwriting; this article does not represent a commitment to lend. Loan terms, rates, and qualification standards vary by borrower, property, and state, and are subject to change at any time. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.