The Quick Read: A DSCR lender adds the rent used for lender review from each unit, then divides that total by one full monthly payment on the whole building. Each unit’s rent comes from its lease or the appraiser’s market rent, and most programs use the lower of the two. A duplex is tested as one property, not as two separate loans.
- Both units’ rents are combined into a single number and compared to one payment (principal, interest, taxes, insurance, and any association dues).
- Each unit gets its own rent figure from the lease or the appraisal. Across most of the wholesale network, the lower figure wins.
- A vacant unit usually counts at the appraiser’s market rent, though treatment varies by program.
- Clearing the coverage test is not the same as positive cash flow.
- Eligibility is subject to lender guidelines, credit approval, and property review.
Key Terms Defined
DSCR (debt service coverage ratio) is the property’s qualifying monthly rent divided by its monthly housing payment. A result of 1.00 means rent equals the payment.
PITIA stands for principal, interest, taxes, insurance, and association dues. It is the full monthly obligation the rent has to cover.
Market rent is the appraiser’s opinion of what a unit would rent for today, based on comparable rentals nearby.
In-place lease is the signed agreement with a current tenant, including the rent that tenant actually pays.
Rent schedule is the section of the appraisal where the appraiser lists actual rent and estimated market rent for each unit.
Rent roll is a simple list of every unit, its tenant, its lease dates, and its monthly rent.
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Rate source: Freddie Mac 30-yr average via FRED® — Federal Reserve Bank of St. Louis · effective Oct 22, 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 22, 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.
How Does the Lender Add Up Both Units?
The lender sets a rent used for lender review for each unit, adds those figures together, and divides by the building’s full payment. Nothing is tested unit by unit against half a payment. Two rent checks sit against one mortgage, and that is why duplexes often look strong on paper.
Here is the sequence on a typical file:
1. Confirm the property is a legal duplex. Two separately rentable units is the baseline. Duplexes through fourplexes run as residential DSCR files.
2. Set the rent for each unit. A leased unit starts with its signed lease. A vacant unit starts with the appraiser’s market rent.
3. Order the right appraisal. A two-to-four unit property uses the small residential income report, known as Form 1025. The single-family rent form (1007) does not apply here.
4. Compare lease and market rent. Across the wholesale network Lendmire places files with, most programs use the lower of in-place lease rent and appraiser market rent.
5. Sum the units. The qualifying rents are added into one monthly figure.
6. Divide by PITIA. The result is the coverage number. Stronger ratios open better pricing and leverage.
Lendmire’s wholesale network includes many lenders, and their guidelines differ in the details. The mechanics above hold across most of them. For the full program picture, see the complete DSCR loans guide.
Which Rent Counts for Each Unit?
The rent that counts is usually the lower of the lease and the appraiser’s market rent, set one unit at a time. A lease above market does not raise the number. A lease below market pulls it down. Here is how common situations resolve.
| Situation | Rent input used | What to do |
|---|---|---|
| Leased at market | Lease and market agree | Provide the lease |
| Lease above market | Market rent | Expect no credit for the excess |
| Lease below market | The lease | Raise rent at renewal if the lease allows |
| Vacant unit | Appraiser’s market rent | Expect program-level differences |
| Month-to-month tenant | Market rent, lease as support | Document the tenancy |
| Between tenants | Market rent | Show the unit is rent-ready |
Many programs apply the lower-of test per unit. A few compare the building’s total lease rent against its total market rent. The two methods can produce different numbers, so ask which one a program uses before you count on a ratio.
The appraisal form matters because it produces the market-rent side of the comparison. The Fannie Mae forms list shows Form 1025 as the report for two-to-four unit income properties. Its rent schedule tells the appraiser to reconcile indicated market rents into an opinion of rent for each unit, and it reports actual rent next to estimated market rent. DSCR loans do not follow agency selling rules. They borrow the form because it fits a small rental building.
Some files also carry an operating income statement (Form 216) for a leased building. Lenders typically want a rent roll covering both units alongside the appraisal.
Worked Example: A Duplex With Unequal Units
When one unit leases above market and the other below, the lender sums per-unit figures, not building averages. The numbers below are modeled assumptions, not market data or program terms. They use index points instead of dollars so you can see the logic.
Call each unit’s market rent 100 points. Unit A’s lease is 110 points. Unit B’s lease is 85 points. The full monthly payment on the building is 160 points.
| Unit | Lease | Market | Rent used |
|---|---|---|---|
| Unit A | 110 | 100 | 100 |
| Unit B | 85 | 100 | 85 |
| Total | 195 | 200 | 185 |
Applied per unit, the rent used for lender review is 185. Divided by 160, coverage is about 1.16x. Unit A’s extra 10 points earn nothing, and Unit B’s shortfall counts in full.
Now run the same building under a program that compares totals. Total lease rent is 195 and total market rent is 200, so the lower figure is 195. Coverage is about 1.22x. Same building, same leases, a different answer.
Picture an investor who assumed both leases would simply be added up. That investor expected 195 over 160 and got a lower number under the per-unit method. The surprise is easy to avoid by asking the question early.
Why Does a Duplex Often Cover Better Than a Single-Family Rental?
A duplex adds a second rent check without adding a second mortgage. Rent can roughly double while the payment on the building grows by much less. That is how a two-unit property can clear coverage where a similarly priced house might not.
| Factor | One-unit rental | Duplex |
|---|---|---|
| Rent checks against payment | One | Two |
| Appraisal rent form | Form 1007 | Form 1025 |
| Rent roll | Usually not needed | Typically requested |
| Vacancy exposure | All or nothing | One unit at a time |
The tradeoff is real. A duplex has two tenants to manage and two sets of turnover. Shared systems like the roof, the boiler, or the water line can be expensive, and the DSCR test does not see any of that.
What Happens When One Unit Is Vacant?
A vacant unit usually counts at the appraiser’s market rent, but some programs treat it more harshly. A vacant unit can drag the numerator down, depending on program guidelines. Lendmire’s piece How a DSCR Lender Counts Rent on Vacant and Expiring Units goes deeper on this case.
Use the same modeled assumptions: each unit at 100 points of market rent and a payment of 160 points.
| Treatment of vacant unit | rent used for program review | Coverage |
|---|---|---|
| Counted at market rent | 200 | About 1.25x |
| Counted at zero | 100 | About 0.63x |
That gap is why the program matters as much as the property. A ratio below 1.00 is not a dead end. Coverage below 1.00 is available through select lenders in the network, with leverage and terms adjusted. Meanwhile, 1.00 is where many select programs start. Which path fits depends on the lender, the borrower profile, reserves, and property review.
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.
What Does Not Count?
Base rent from legal, separately rentable units counts. Several things that borrowers like to add do not.
- One-off charges. Late fees, application fees, and similar items are not recurring rent.
- Free months and concessions. Disclose them. They reduce effective rent, and lenders ask for them.
- Unpermitted or accessory space. A basement, garage, or bonus room that is not a legal unit generally does not add rent.
- Rent paid in cash with no trail. Deposits or bank statements typically back up the lease.
Some programs credit ancillary income such as parking or laundry, and some do not. Treat it as upside, not as part of your base calculation.
If a unit is rented short term, the appraisal’s rent form reports monthly rent and does not estimate nightly rates. Hosting history or a market-data report typically supports those files. 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.
Why Your Number and the Lender’s Number Differ
Your spreadsheet and the lender’s ratio disagree because they start from different inputs. Run through this reconciliation list when the numbers do not match.
- Rent source. You used the lease. The lender used the lower of lease and appraisal.
- Payment components. You counted principal and interest. The lender counts taxes, insurance, and any association dues too.
- Tax and insurance estimates. The lender’s figures may be higher than yours and can move the ratio even when rent is unchanged.
- Gross versus net. Residential DSCR on a duplex typically uses gross rent used for eligibility review over the full payment. Commercial-style underwriting uses net operating income over debt service. Some web pages mix the two methods, which is why advice online sounds inconsistent.
- Vacancy treatment. Some programs apply a vacancy factor and some do not, so ask which approach applies to your program.
For a duplex, the gross-rent-over-PITIA version is the working method on the programs Lendmire sees.
What the Ratio Does Not Tell You
Coverage compares rent to PITIA and nothing else. Repairs, vacancy, management, utilities, and capital improvements sit outside the calculation. A building at exactly 1.00x has no cushion, since one empty month or one repair pushes it underwater.
So clearing the test is not the same as positive cash flow. Run your own budget beside the lender’s ratio.
The strongest files pass two tests: enough rental coverage and enough equity. On an investment-property purchase, most files land at 75%–80% LTV, which means 20%–25% down. Select high-leverage programs reach 85% LTV with roughly a 700+ score. A larger down payment lowers the payment and can lift coverage. It does not erase leverage caps, credit floors, reserve rules, or property eligibility.
Credit expectations vary. A 620 floor exists in parts of the network, most programs want around 660, and 700+ unlocks the strongest leverage tiers. Reserves commonly run about 6 months of PITIA and can step up to about 9 months on larger loans, subject to lender guidelines. Manufactured homes, log homes, and barndominiums are not offered.
Owner-Occupied Duplexes and the Five-Unit Line
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 you plan to live in one unit, the file typically belongs in an owner-occupied loan program rather than a DSCR program. Government-backed lending shows how that works. FHA lenders document proposed rent on two-to-four unit properties with an appraisal that shows fair market rent. The same kind of rent analysis serves a different purpose there. After you move out and both units are rented, a DSCR file may fit, subject to lender guidelines. No-ratio structures exist only through select lenders, generally for borrowers who already own a primary residence.
At five units and above, a property moves into commercial multifamily, with different underwriting and parameters. The duplex-to-fourplex range is where the combined-rent method described here applies.
Prep Checklist Before the Appraisal
Walk in with these ready, and the rent figure has fewer surprises:
- A signed lease for each unit, with dates and rent amounts.
- A rent roll listing both units.
- Deposits or bank statements showing rent was actually paid.
- A note on any concessions or free months.
- Proof that both units are legal, separately rentable spaces.
- A fresh estimate of taxes and insurance, since both sit inside PITIA.
- Your own estimate of each unit’s market rent, so the appraisal is not a shock.
If a tenant is on an old lease inherited with the property, Lendmire’s article How a DSCR Lender Counts Rent From Inherited Tenants on Old Leases covers that situation.
Frequently Asked Questions
Do both units’ rents really count toward one payment?
Yes. The lender totals the rent used for the lender’s review from both units and compares it to the full monthly payment on the building. Each unit’s figure comes from its lease or the appraisal, and most programs use the lower one. The units are never tested separately against half the payment.
What if my lease is higher than the appraiser’s market rent?
Market rent generally wins on that unit. An above-market lease does not push coverage higher, and the extra rent counts for nothing. The reverse also applies, because a below-market lease typically lowers the number.
Can I count a unit that is empty?
Often yes, at the appraiser’s market rent. Some programs treat vacancy more conservatively, which can lower the ratio.
Does a duplex always qualify more easily than a single-family home?
No. A duplex often covers better because the rent roughly doubles while the payment does not. But taxes, insurance, price, and the rents in that specific building drive the result, and each file is subject to lender guidelines and credit approval.
Which appraisal form applies to a duplex?
Form 1025, the small residential income report for two-to-four unit properties. Form 1007 is for single-family rentals. A leased building may also include an operating income statement (Form 216).
Next Step
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 is a broker arranging financing through select lenders in its wholesale network across 41 markets, including Washington, D.C.
About Lendmire
A non-QM mortgage broker (NMLS# 2371349), Lendmire arranges DSCR financing for real estate investors in 41 markets — 40 states plus Washington, D.C. Because deals are underwritten primarily on property cash flow rather than personal income documentation, the structure suits self-employed buyers and entity-owned portfolios. Lendmire places loans through wholesale investor lenders; it is not a direct lender. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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References
1. Fannie Mae Selling & Servicing Guide Forms
This article is part of Lendmire’s DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: DSCR Rent Coverage Rules When Rent Falls Short of the Payment · How a DSCR Lender Counts the Mortgages an LLC Can Hold · DSCR Loan Requirements for Buying a Duplex as a Rental
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Required disclosures. Lendmire (NMLS# 2371349) operates as a licensed mortgage broker, not a direct lender or depository. The discussion in this article is general in nature and should not be relied upon as financial, legal, or tax advice — every investment scenario is unique and should be reviewed by a qualified professional. Any loan inquiry is subject to lender underwriting, and this article is not a commitment to lend or a guarantee of approval. Mortgage rates, loan terms, and program guidelines vary by borrower, property, and state, and may change without notice. Equal Housing Opportunity. Verify licensure at NMLS Consumer Access.