The Quick Read: A fourplex is one property with one payment, so the rents from all four units are added together and divided by the single full monthly obligation on the building: principal, interest, taxes, insurance, and association dues. The result is one coverage ratio, not four. It qualifies primarily on property-level rental income covering the payment, subject to lender guidelines.
- All four unit rents are summed and tested against one PITIA figure.
- 1.00 is where select programs start. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted.
- The appraisal supplies both the value (for LTV) and the rent opinion (for coverage).
- One vacant unit removes a quarter of the rent. Test the file with a unit empty.
- Clearing the ratio does not erase leverage caps, credit floors, or reserve rules.
Investors tend to ask the wrong question about fourplexes. They ask whether each unit qualifies. The lender asks whether the building does. This article walks through how the combined-rent test works, how rent is set for each unit, what the appraisal does, and where files break.
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Why Is a Fourplex One Test, Not Four?
A fourplex is a single residential property with a single loan and a single payment. Underwriting adds the rent used for lender review from every unit and compares the total to that one payment. No unit has to cover “its share.” A strong unit can offset a weak one.
This is the 1–4 unit lane. Commercial loans work differently. They use net operating income over debt service, where NOI subtracts repairs, utilities, management, and vacancy allowances. A fourplex sits on the simpler residential side. Five or more units move to the commercial-style test, which is a different product with different math.
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 borrower’s W-2s and personal debt-to-income ratio are not the test. The property’s rent against its payment is.
For the broader picture of how these loans work, see Lendmire’s complete DSCR loans guide.
Key Terms Defined
DSCR (debt service coverage ratio): Qualifying monthly rent divided by the full monthly payment on the property.
PITIA: Principal, interest, property taxes, insurance, and association dues, added into one monthly figure.
ITIA: The same figure on an interest-only structure, where the principal piece drops out.
Rent schedule: The appraiser’s unit-by-unit opinion of market rent for the building.
Rent roll: The owner’s list of each unit, its tenant, its lease rent, and its lease dates.
LTV (loan-to-value): The loan amount divided by the appraised value. It is a separate gate from coverage.
How Does Underwriting Treat Combined Rents, Step by Step?
Underwriting follows the same sequence on most fourplex files. Each step has a place where the file can go wrong.
1. Set the rent for each unit. Each unit gets its own figure, drawn from the lease, the appraiser’s market-rent opinion, or both. Many programs across the wholesale network use the lower of the two for an occupied unit. A vacant unit is typically counted at market rent from the appraisal. Treatment varies by program, so confirm it before the file goes in.
2. Sum the unit rents. Add the rent used for lender review for all four units. This is the numerator.
3. Build the full payment. Add principal and interest, property taxes, insurance, and any association dues. Miss one piece and the ratio is wrong. The most common miss is an insurance quote that is incomplete or stale when the file reaches review.
4. Divide. Total rent used for lender review divided by PITIA gives the ratio. At 1.00, rent equals the payment. Below 1.00 is a shortfall.
5. Run the other gates. Coverage is one test. Leverage, credit, reserves, and entity documents are the others.
Notice that the appraisal feeds two of these gates at once. It sets the value that drives LTV, and it supplies the rent opinion that drives coverage. A low appraisal can pinch both.
Which Appraisal Form Covers a Fourplex?
A fourplex is normally appraised on the Small Residential Income Property Appraisal Report, Form 1025. The Fannie Mae Selling Guide section on appraisal report forms lists Form 1025 for traditional appraisals of two- to four-unit properties. The published form itself says it is designed to report an appraisal of a two- to four-unit property, and it is also Freddie Mac Form 72.
The single-family rent schedule, Form 1007, is a one-unit tool. The same Selling Guide section says it is required when the property is a one-unit investment property and the borrower is using rental income to qualify. A fourplex normally relies on the rent analysis built into the 1025. Some third-party guides loosely say “1007 or 1025.” For a fourplex, the 1025 is the form.
One reminder. Using these forms does not make a DSCR loan an agency loan. The forms are borrowed vocabulary. The program rules for DSCR files come from the lenders in the wholesale network, not from agency guides.
What Happens When Lease Rent and Market Rent Disagree?
Most programs the network places files with look at both numbers for each occupied unit and use the lower one. The mismatch cases are where files get surprised.
| Situation | Typical treatment | Effect on the ratio |
|---|---|---|
| Lease above market | Lower figure (market) usually governs | Ratio comes in below the lease-based math |
| Lease below market | Lease rent usually governs | Ratio is held down by the legacy tenant |
| Month-to-month tenant | Program-specific; lease evidence may be thin | Can push the unit to market rent or require more support |
| Vacant unit | Market rent from the appraisal, program permitting | Counts, but the building carries real vacancy risk |
The takeaway: do not underwrite your own spreadsheet on lease rents alone. Ask what the appraiser is likely to conclude, because that opinion often sets the floor on each unit.
If the appraiser’s total rent comes in below expectations, the file is not dead. Collect rent evidence on comparable four-unit and small-building rentals, ask the appraiser to review the rent schedule, and submit it through the lender’s reconsideration process. A packet with recent comparable rents recovers more than a general complaint does.
How Do You Read the Ratio? (A Worked Example With Ratios Only)
Run the numbers on a modeled fourplex where the combined rent used for program review covers the full building payment at 1.30x. These are modeled assumptions, not market data. Every unit is occupied, and the file clears 1.00 with room to spare.
Now vacate one unit. A quarter of the rent is gone, so the same building drops to roughly 0.98x. It slips under 1.00 on a single empty unit. That is simple arithmetic: one of four units is 25% of the rent. To still reach 1.00 with one unit empty, the building needs about 1.33x coverage when fully occupied.
Now keep all four units rented but switch to an interest-only structure, available through select lenders in the network. The payment used is ITIA instead of PITIA, so the same rent produces a higher ratio. The trade-off is that the principal is not being paid down, and the structure is program-specific.
| Scenario (same building) | Approximate coverage |
|---|---|
| All four units occupied, standard amortizing | 1.30x |
| One unit vacant | about 0.98x |
| All occupied, interest-only | above 1.30x |
Sub-1.00 is not automatically a dead end. 1.00 is where many select programs start. Qualification stays subject to lender guidelines, credit approval, and property review.
Why Does a Fourplex Often Cover Better Than a Single-Family Rental?
Four rents sit over one building payment. A single-family rental has one rent over one payment. When purchase price per unit is lower than a house of similar total cost, the combined rent can carry the loan with more cushion.
Two cautions. First, the risk is concentrated differently. One empty unit in a fourplex removes a quarter of the rent. One empty single-family house removes all of it, so the fourplex is steadier against a single vacancy. Second, leverage can bind before coverage does. A fourplex with strong combined rents may clear the ratio easily and still be capped by maximum LTV. In that case only more equity or a higher appraisal raises the loan amount.
Clearing 1.00 is not the same as positive cash flow. DSCR compares rent to PITIA only. Repairs, vacancy, management, utilities, and capex sit outside the calculation. A fourplex with a healthy ratio can still run thin after real operating costs.
Gross rent over PITIA is also more forgiving than commercial NOI over debt service. A property can show a materially lower ratio once operating expenses are subtracted. That is why the 1–4 unit and 5+ unit lanes should never be compared directly.
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 Do the Network’s Programs Typically Require Beyond Coverage?
The ratio is one gate. The others are where a clean-looking fourplex file stalls.
- Leverage: On a purchase of an investment property, most files land at 75%–80% LTV, which is 20%–25% down. Select high-leverage programs reach 85% LTV with roughly a 700+ score. Cash-out refinance tops out around 75% LTV on a standard rental, with about 6 months of seasoning as the common expectation.
- Credit: A 620 floor exists in parts of the network. Most programs want around 660. A 700+ score unlocks the strongest leverage tiers.
- Loan size: up to $3,000,000 on standard programs (smaller balances available through select lenders). Above $2,500,000 the network generally holds to 30-year fixed structures.
- Reserves: They vary by lender, leverage, loan size, and transaction type. About 6 months of PITIA is common. Conservative rate-and-term files at modest leverage under $1,500,000 can see reserves waived. Loans above that size typically step up to about 9 months.
- Terms: The spine is the 30-year fixed. Extended terms and interest-only periods are available through select lenders, and ARM structures exist for investors who want them.
A larger down payment lowers the monthly payment and can lift the ratio. It never erases leverage caps, credit floors, reserve rules, or property eligibility. The strongest files clear both tests: enough equity and enough rental coverage. Details differ by program and are subject to lender guidelines.
What Documents Does a Fourplex File Need?
Clean documentation gives the reviewer fewer preventable gaps. Gather these before submission:
- Current leases for every occupied unit, or a rent roll that matches them
- The Form 1025 appraisal with its unit-by-unit rent schedule
- Proof of taxes, insurance, and association dues
- A complete insurance quote covering the whole building
- A credit report
- Entity papers if the loan will be held in an LLC, subject to lender program eligibility
- Reserves documentation showing the funds and their source
The usual friction is a rent roll that does not match the leases, or an insurance quote that covers part of the building. Either one forces a re-run of the ratio.
What Are the Edge Cases?
Vacant units. Whether a vacant unit counts at market rent depends on the program. Some programs limit how many units in a 2–4 unit building can be empty. Ask before contract, not after.
Owner-occupied or house-hack. DSCR is for non-owner-occupied investment property. A buyer who plans to live in one unit is looking at a different product, often owner-occupied financing. Once the occupancy period ends and the building is purely a rental, DSCR is the usual next step.
Five or more units. The test switches to NOI over debt service. That is commercial-style financing, not a larger version of this test.
Short-term rental fourplex. The single-family rent schedule was built around monthly rents. The Fannie Mae June 2024 Appraiser Update notes that nightly short-term rental rates should not be multiplied by 30 to get monthly rent. A fourplex used for short-term rental may be stress-tested on long-term rent. On STR files in the network, purchase leverage tops out at 75% LTV, refinance runs around 70%, and cash-out is 70% on short-term-rental collateral. Expect a 640+ score and about 12 months of hosting history.
Ineligible property types. Manufactured homes (single- and double-wide), log homes, and barndominiums are not offered in the network’s DSCR programs.
Appraisal type. A fourplex normally needs a full appraisal. An automated value estimate gives value only, with no unit rents.
What If the Ratio Comes in Short?
A ratio below target has levers. Each has a cost.
| Lever | Effect | Trade-off |
|---|---|---|
| Larger down payment | Smaller loan, lower payment, higher ratio | More cash in; leverage caps still apply |
| Interest-only structure (select lenders) | Lowers the payment used in the test | No principal paydown |
| Lease up a vacant unit before submission | Adds documented rent | Needs a signed lease and time on the property |
| Correct a low rent opinion | Raises rent used for eligibility review | Needs real comparable rents and a reconsideration request |
| Sub-1.00 path (select lenders) | Allows lower coverage | Leverage and terms adjust |
Pick the lever that matches the cause. If the denominator is inflated by a high insurance quote, shop the quote. If the numerator is light because one unit is under market, the fix is rent evidence, not equity.
Common Mistakes
1. Assuming each unit must qualify on its own. The building is tested as one.
2. Using the commercial formula. For 1–4 units it is gross rent over PITIA.
3. Leaving association dues or flood coverage out of the payment.
4. Counting the lease rent when the appraisal will likely come in lower.
5. Treating 1.25 as a requirement. That number comes from commercial material using NOI. The residential rent-over-PITIA test uses a minimum set by the program.
6. Confusing coverage with cash flow. A passing ratio is a lending test, not a profit forecast.
Tax treatment varies; consult a qualified tax professional before relying on any deduction.
Frequently Asked Questions
Does every unit in a fourplex have to qualify on its own?
No. The building is one property with one payment, so all unit rents are added together and tested against that single payment. A strong unit can offset a weaker one. What matters is the total.
Which rent counts for each unit, the lease or the appraisal?
It depends on the program. Many programs in the network use the lower of the lease rent or the appraiser’s market rent on an occupied unit. A vacant unit is typically counted at market rent from the appraisal, where the program permits it.
What appraisal form is used on a fourplex?
Form 1025, the Small Residential Income Property Appraisal Report, is used for two- to four-unit properties. Form 1007 is a one-unit rent schedule. The 1025 carries the rent analysis for a fourplex.
Can a fourplex qualify if one unit is empty?
Sometimes. Some programs count a vacant unit at market rent, and some limit how many units can be vacant. Since one empty unit removes about 25% of the rent, a fully occupied building needs roughly 1.33x coverage to stay at 1.00 with one unit empty. Eligibility stays subject to lender guidelines.
Can I buy a fourplex with DSCR if I plan to live in one unit?
Generally not. DSCR loans are built for non-owner-occupied investment property. An owner-occupied purchase is a different product. Once the building is a pure rental, DSCR is the usual path.
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 Guide B4-1.2-01: Appraisal Report Forms and Exhibits
2. Fannie Mae (document 12376)
This article is part of Lendmire’s DSCR loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: DSCR Cash-Out Refinance vs Bridge Loan on a Fourplex · Should You Choose a DSCR Loan by Your Hold Period? · Buying a First Rental on a DSCR Loan vs Buying a Home First
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
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- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
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Disclosure information. Lendmire is a state-licensed mortgage brokerage under NMLS# 2371349. Lendmire is not a depository institution, direct lender, or financial advisor — all loans referenced are placed through wholesale lender partners and are subject to each lender's underwriting standards. This article is provided for general informational purposes and is not a commitment to lend, nor does it constitute financial, legal, or tax advice. Loan programs, terms, rates, and qualification standards change without notice and depend on borrower profile, property type, and the state in which the subject property is located. Equal Housing Opportunity provider. NMLS Consumer Access: nmlsconsumeraccess.org.