The Quick Read: A DSCR lender counts rent on a duplex one unit at a time, using the lower of each unit’s lease or the appraiser’s market rent. The lender adds those unit figures into one building rent and divides it by the building’s full monthly payment, known as PITIA. A lease above market adds nothing to the ratio.
- The appraiser’s rent opinion, not your pro forma or asking rent, caps the ratio.
- Each unit is tested separately, then the totals roll into one building rent.
- Vacant units count at appraiser market rent alone.
- Clearing 1.00 does not mean positive cash flow.
- A larger down payment can lift the ratio but never erases leverage caps or credit floors.
Sacramento is only the example here. The mechanics below are national and apply to any two-unit building. Lendmire’s complete DSCR loans guide covers the wider program picture.
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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 Is the DSCR Test on a Duplex?
The test compares one rent number to one payment number. DSCR stands for debt service coverage ratio. The rent is the gross monthly rent the lender credits. The payment is PITIA: principal, interest, taxes, insurance, and any HOA dues.
A duplex is one rental asset with one loan. So the lender does not test each unit against half a payment. It adds both units’ counted rent and divides by the whole building’s payment.
Say the counted rent comes to 1.20 times the payment. That is a 1.20x ratio. A 1.00 ratio is the floor on select programs we place files with, and stronger ratios open better pricing and leverage. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted.
This is a gross-rent test. Vacancy, repairs, management, utilities, and capital costs sit outside the formula. A duplex can clear 1.00 and still lose money each month. Never treat the two as the same thing.
Key Terms Defined
DSCR: The monthly rent a lender credits, divided by the monthly PITIA.
PITIA: Principal, interest, taxes, insurance, and HOA dues, which together make up the full monthly payment.
Market rent: The rent an appraiser concludes a unit would earn on the open market, based on comparable rentals.
In-place lease: The signed lease on an occupied unit, showing the rent the tenant actually pays.
Rent schedule: The part of the appraisal that lists estimated market rent for each unit.
LTV: Loan-to-value, the loan amount as a percentage of the property’s value.
Who Writes the Rent on a Two-Unit Building?
The appraiser does, and the lease checks the appraiser. A two- to four-unit property gets a full appraisal on Form 1025, the Small Residential Income Property Appraisal Report. The Fannie Mae Selling Guide describes that form as the report for traditional appraisals of two- to four-unit properties.
DSCR is not an agency product, and no agency guide governs it. DSCR files simply borrow the appraisal forms. This is the one contrast worth making: the agency rules use a separate one-unit rent form, Form 1007, only for single-unit investment homes. A duplex does not need it.
The 1025 does two jobs. It sets value, which drives LTV. It also sets per-unit market rent, which drives the ratio. Per the form text itself, the rent schedule reconciles indicated market rents to each subject unit and gives a total estimated rent, with comments on differences between actual and estimated rents. The Fannie Mae forms index lists both forms by name if you want to see them.
How Does Underwriting Read the Rent, Step by Step?
Here is the sequence on a typical duplex file.
1. The appraisal is ordered. The appraiser pulls comparable rentals, adjusts them to your unit mix and condition, and states a market rent for each unit.
2. Documents come in. For occupied units, expect signed leases, a rent roll, and often proof of payment such as bank deposits. A useful rent roll lists the unit, bedroom count, lease rent, deposit, lease dates, and occupancy status.
3. Each unit is tested alone. On most programs across our wholesale network, an occupied unit counts at the lower of its lease rent or its market rent.
4. The unit figures are summed. That total becomes the building’s gross monthly rent.
5. The lender divides by PITIA. Flood insurance goes in the payment if the property sits in a flood zone, and so do HOA dues.
6. The ratio is checked against the program. Leverage, credit, and reserves are then reviewed alongside it.
The lower-of rule is typical practice, not a universal law. Some lenders treat it differently depending on occupancy, transaction type, and the supporting appraisal. Program guidelines control, and every file is underwritten individually.
Whose Rent Counts in Each Situation?
The table below shows how a duplex unit is usually treated. It reflects common practice across the programs we place files with, subject to lender guidelines.
| Situation | Rent usually counted | Why |
|---|---|---|
| Lease above market | Market rent | Appraisal acts as a ceiling |
| Lease at market | Either; they match | No gap to resolve |
| Lease below market | The lease | Lower-of rule |
| Vacant unit | Market rent | No lease exists |
| Month-to-month or expired lease | Usually market rent | The old lease no longer fixes the rent, so market rent is used to measure income |
| Related-party tenant | Market rent, with scrutiny | Not an arm’s-length lease |
The lease-above-market row surprises people. Picture an owner whose tenant pays well over what the appraiser supports. The extra rent is real income to the owner. To the lender, it adds nothing to the ratio, and leverage is sized off the lower figure.
What Happens When One Unit Is Leased and One Is Vacant?
Each unit follows its own rule. The occupied side compares lease to market and takes the lower. The vacant side counts at the appraiser’s market rent. Then the two are added.
Picture a duplex where the front unit is leased a bit under market and the back unit is empty. The front unit counts at its lease. The back unit counts at the appraiser’s figure. The building rent is the sum of those two numbers over one payment.
Some lenders add an underwriting condition that a lease be in place before or after closing on a vacant unit. Treat that as a program-by-program item, not a given.
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.
How Does the Appraiser Land on a Rent Figure?
The appraiser builds the number from comparable rentals, not from your spreadsheet. Three things move it most: unit mix, condition, and submarket. A renovated two-bedroom beside similar rentals will support a different figure than a dated unit with deferred upkeep.
For a duplex in Sacramento or anywhere else, the submarket matters because rents differ block to block. Describe demand with employment, rent levels, and lease length, not with a neighborhood’s reputation. The appraiser uses the data the comps give.
You can help the file without gaming it. Hand the lender a clean rent roll, signed leases, and a list of recent upgrades. Do not push the appraiser toward a number. A defensible figure survives review; an inflated one gets adjusted.
What About Extras, Room Rentals, and Accessory Units?
Base rent is what the ratio is built on. Pet fees, parking, storage, and utility reimbursements are treated differently by program, and many lenders credit little or none of them. Do not count on them to carry a thin file.
Rent-by-the-room inside one unit and an accessory dwelling on the lot are edge cases. How they are treated depends on the appraisal and the program, so raise them with your broker before you write an offer. Short-term rentals are a separate lane. The 1025 estimates rent on a long-term monthly-lease basis, while short-term programs use their own income methods and eligibility rules. 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.
Tenants on housing vouchers can draw extra scrutiny on some files. Expect the lender to lean toward the lowest credible figure.
What If the Appraiser’s Rent Comes In Low?
You have a short decision path, and none of it involves arguing with the number.
- Check the schedule. Review the per-unit figures and the comps behind them for factual errors, such as the wrong bedroom count.
- Supply support. Documented, relevant comparable rentals can be submitted for review. Support helps; pressure does not.
- Re-size the deal. A lower counted rent lowers the ratio. Leverage and terms may adjust. Coverage below 1.00 is available through select lenders in the network, with leverage and terms adjusted.
- Add equity. More down can lower the payment and lift the ratio. It never removes leverage caps, credit floors, reserve rules, or property eligibility. The strongest files clear both tests: enough equity and enough rental coverage.
- Walk or renegotiate. If the deal only worked on asking rents, the price may need to move.
Before You Write the Offer
Test the counted rent before the appraisal does. Pull recent comparable rentals for each unit type. Request leases and a rent roll from the seller. Estimate taxes and insurance, since both move the payment side of the ratio.
Then run the ratio on the lower of lease or your best market-rent estimate for each unit. Label every assumption as yours, not the underwriter’s. If the deal clears with room to spare, a modest appraisal haircut will not sink it.
On the program side, most purchase files land at 75%–80% LTV on an investment property, with a typical credit floor of 620 in parts of the network and most programs wanting around 660. Scores of 700 and up unlock the strongest leverage tiers. Reserves are commonly around 6 months of PITIA, stepping up to about 9 months above $1,500,000. Standard programs reach $3,000,000. All of this is subject to lender guidelines, and none of it is a commitment to lend.
Why Is the Counted Rent Lower Than Your Spreadsheet?
When the ratio comes back below your math, one of these is usually the cause.
| Cause | What happened |
|---|---|
| Lease above market | Surplus rent was capped at the appraiser’s figure |
| Asking rent used | Spreadsheet used a hoped-for number, not comps |
| Vacant unit | Counted at market rent only |
| Extras included | Pet, parking, or storage income was not credited |
| Payment higher than planned | Taxes, insurance, or HOA moved PITIA up |
| Mixed occupancy | One unit’s lower figure pulled the total down |
Another quiet trap: each property is tested alone. A strong duplex does not rescue a weak one in the same portfolio. The upside is that DSCR files do not run through your personal debt-to-income ratio, so tax write-offs and personal income do not enter the ratio. A DSCR loan qualifies primarily on property-level rental income covering the payment, subject to lender guidelines. Tax treatment varies; consult a qualified professional.
For the contrast with bank underwriting on a high earner’s duplex, see Lendmire’s article Does a Jumbo Lender Count Duplex Rent for a High-Earning W-2 Buyer?.
Frequently Asked Questions
Does an above-market lease raise my DSCR?
No. On most programs the appraiser’s market rent acts as a ceiling, so surplus lease rent adds nothing. Leverage is also sized off the lower figure.
What rent counts for a vacant unit?
The appraiser’s market rent, since no lease exists. Some lenders add a condition requiring a lease before or after closing, so ask your broker about the specific program.
Do I need tax returns to qualify?
Qualification runs on documented property rent under the applicable program, subject to lender guidelines. Your personal tax write-offs do not enter the ratio.
Does DSCR account for vacancy and repairs?
No. It compares gross counted rent to PITIA only. Vacancy, management, repairs, utilities, and capital costs sit outside the calculation, so a duplex can clear 1.00 and still run tight in real life.
Can I buy the duplex through an LLC?
Often yes, depending on program guidelines.
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. Reach the team at 828-256-2183 or request a quote.
About Lendmire
Lendmire — NMLS# 2371349 — is a mortgage brokerage specializing in DSCR investor loans, helping arrange financing across 41 markets, including Washington, D.C., through wholesale and investor-lending channels. The model centers on property-level rental income reviewed by the lender rather than W-2 documentation, subject to lender guidelines, suiting entity-owned and multi-property investors. Lendmire holds Scotsman Guide Top Mortgage Workplace recognition for 2025 and 2026.
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References
1. Fannie Mae Selling Guide B4-1.2-01
2. Form 1025 blank form (e-appraise copy)
3. 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: How a DSCR Lender Reads a 1.25 Coverage Ratio on a Rental · Does a DSCR Loan Need a 1007 Rent Schedule? · DSCR Loans for Buyers Choosing a Duplex as Their First Rental
Guides: DSCR Loans in Sacramento, CA · DSCR Loans in California
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
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.