The most striking example: Chicago. Cook County’s 2.3–2.6% effective property tax rate makes SFR DSCR nearly impossible — a $480,000 Chicago SFR generating $2,400/month rent produces DSCR of approximately 0.58, below any DSCR program. But a $680,000 Chicago 3-flat generating $6,100/month combined rent from three units produces DSCR of 1.11 at 70% LTV. Same city, same tax rate, same lender — the combined income from three units solved the problem that one unit couldn’t.
Multi-Unit Property? Combined Rent Qualifies the Loan.
Go Deeper
Mbanc NMLS #38232 | Equal Housing Opportunity Lender
Program Parameters by Unit Count
2-Unit (Duplex)
Maximum LTV: 75–80% at standard DSCR (1.00+, 660+ credit). 70% at no-ratio.
Down payment: 20–25% at standard. 30% at no-ratio.
Reserve requirement: 4–6 months PITIA.
Income: Combined rent from both units. For occupied units: lower of lease or market. For vacant units: appraiser market rent.
Rate: Comparable to SFR DSCR with modest premium reflecting higher operational complexity.
3-Unit (Triplex)
Maximum LTV: 70–75% at standard DSCR. 65–70% at no-ratio.
Down payment: 25–30%.
Reserve requirement: 5–6 months PITIA.
Income: Combined rent from all three units. Partial vacancy uses market rent for vacant units.
Note: Lower max LTV vs duplex reflects increased operational complexity and higher vacancy risk.
4-Unit (Fourplex)
Maximum LTV: 70–75% at standard DSCR. 65% at no-ratio.
Down payment: 25–30%.
Reserve requirement: 6 months PITIA minimum.
Income: Combined rent from all four units.
Note: 4-unit is the maximum for residential DSCR programs. 5+ units is commercial multifamily with different program parameters.
All unit counts: No W-2. No tax return. No personal income documentation of any kind.
The Combined Rent Multiplier Effect — Why It Changes Markets
The fundamental advantage of multi-unit DSCR is the income multiplier. Examine the same dollar purchase price at different unit counts in the same market:
Memphis TN (Shelby County, 1.5% effective taxes), $380,000 purchase:
SFR: Market rent $2,100/month. At 80% LTV ($304,000 loan): P&I $2,282. Shelby taxes: $475. Insurance: $128. PITIA: $2,885. DSCR: $2,100 ÷ $2,885 = 0.73 — below no-ratio floor.
Duplex (same $380,000): Two 2BR units at $1,200/month each = $2,400 combined. At 75% LTV ($285,000 loan): P&I $2,142. Shelby taxes: $475. Insurance: $148. PITIA: $2,765. DSCR: $2,400 ÷ $2,765 = 0.87 — no-ratio, viable.
Triplex (same $380,000, 3-pack of 1BR units): Three units at $900/month each = $2,700 combined. At 70% LTV ($266,000 loan): P&I $1,998. Shelby taxes: $475. Insurance: $168. PITIA: $2,641. DSCR: $2,700 ÷ $2,641 = 1.02 — standard.
The triplex at the same purchase price, same market, same tax rate went from sub-program to standard DSCR — entirely due to the combined income from three units. This is the multi-unit advantage in concentrated form.
Chicago (Cook County, 2.4% effective), $720,000 purchase:
SFR: Typical Chicago north side SFR rent $3,000/month. At 70% LTV ($504,000): P&I $3,787. Cook taxes (2.4%): $1,440. Insurance: $225. PITIA: $5,452. DSCR: $3,000 ÷ $5,452 = 0.55 — no program.
3-flat (same $720,000): Three 2BR units at $2,000/month each = $6,000 combined. At 70% LTV: PITIA $5,452. DSCR: $6,000 ÷ $5,452 = 1.10 — standard. The income tripled; the PITIA was identical. DSCR went from no program to solid standard.
Income Qualification — Every Occupancy Scenario
Scenario A: All Units Occupied
Sum the qualifying rent from each occupied unit. Qualifying rent per unit = lower of (signed lease rent) or (appraiser market rent for that unit type/floor plan).
Example: Duplex with both units occupied. Unit 1 lease: $1,400/month. Appraiser market: $1,450. Qualifying: $1,400. Unit 2 lease: $1,500/month. Appraiser market: $1,350. Qualifying: $1,350. Combined qualifying rent: $2,750.
Note: Unit 2’s above-market lease is capped at market. A tenant paying above market does not benefit the DSCR calculation beyond the appraiser’s market determination.
Scenario B: All Units Vacant (New Purchase or Recently Vacated)
Appraiser performs market rent analysis on each unit type. The analysis identifies comparable active leases in the same neighborhood for the same bedroom count and size. Each unit gets its own market rent determination. Combined market rent becomes the qualifying income.
For multi-unit properties in active rental markets, appraiser market rent analysis is generally accurate within 5–8% of actual achievable rents. Conservative market analyses on vacant multi-units are common — the appraiser uses confirmed leases, not asking rents.
Scenario C: Partially Vacant (Mix of Occupied and Vacant)
Most common scenario: a seller is selling a 4-unit building where 3 units are occupied and 1 unit is vacant (perhaps the seller occupied it).
Qualifying rent: sum of (lease rents for occupied units, lower of lease/market) + (appraiser market rent for vacant unit).
Example: 4-unit, $785,000. Unit A lease $1,650. Unit B lease $1,700. Unit C lease $1,575. Unit D vacant. Appraiser market rent for vacant unit: $1,700.
Combined qualifying rent: $1,650 + $1,700 + $1,575 + $1,700 = $6,625/month.
The vacant unit uses market rent, not zero. This is a critical distinction: partial vacancy at acquisition does not zero out a unit’s income contribution to DSCR.
Scenario D: Below-Market Leases
A multi-unit building where one or more tenants have been in place for years at below-market rents. Classic value-add scenario.
Example: Triplex, $495,000. Unit A lease: $950/month (8-year tenant, below market). Unit B lease: $1,050/month. Unit C lease: $1,100/month. Appraiser market rents: $1,350, $1,350, $1,400.
Qualifying rent: $950 (lease, lower than market) + $1,050 (lease, lower than market) + $1,100 (lease, lower than market) = $3,100/month.
Post-lease-renewal qualifying rent (if investor renews at market): $1,350 + $1,350 + $1,400 = $4,100/month.
The difference between current ($3,100) and stabilized ($4,100) qualifying rent is $1,000/month — enough to move DSCR by 30–40 basis points on a typical deal. Below-market lease scenarios are common value-add acquisitions for DSCR investors who accept no-ratio at acquisition and plan to refinance at standard DSCR once leases turn.
The Multi-Unit DSCR LTV Trade-Off
As unit count increases, maximum LTV decreases. Understanding the capital implications:
| Units | Standard Max LTV | Down Payment on $500K | Reserves (6 mo PITIA est.) |
|---|---|---|---|
| 1 (SFR) | 80% | $100,000 | $12,000 |
| 2 (duplex) | 75–80% | $100,000–$125,000 | $14,000 |
| 3 (triplex) | 70–75% | $125,000–$150,000 | $16,000 |
| 4 (fourplex) | 70–75% | $125,000–$150,000 | $18,000 |
The lower LTV on 3-4 unit properties means higher down payment. The investor acquiring a $550,000 triplex at 70% LTV needs $165,000 down plus reserves — more capital than a comparable SFR. The offset: significantly higher combined rental income, better DSCR ratios, and income diversification across multiple tenants (one vacancy doesn’t eliminate all income).
Multi-Unit DSCR by Market
Chicago (Cook County) — Multi-Unit is the Only Path:
As shown above, 2-4 flat buildings in Chicago neighborhoods produce DSCR ratios that SFRs cannot approach at comparable price points. Inner neighborhood 3-flats ($600,000–$950,000) with combined rents of $5,400–$8,000/month at 70% LTV produce DSCR of 1.00–1.20. This is the primary DSCR vehicle for Chicago investment.
Memphis TN — Multi-Unit Amplifies Cash Flow:
Memphis has the best SFR DSCR in the Southeast. Multi-unit amplifies it further. Duplex and triplex inventory in Bartlett and Cordova ($280,000–$450,000) generates combined rents of $2,800–$4,800/month with DSCR of 1.10–1.35 at 70–75% LTV.
Charlotte NC (older housing stock near center city):
Charlotte’s older residential neighborhoods (NoDa, Plaza Midwood, FreeMoreWest) have 2-4 unit residential structures. Cabarrus County’s 0.92% tax rate applies. DSCR 1.05–1.25 at 70–75% LTV on well-priced acquisitions.
San Antonio TX (Bexar County):
San Antonio has multi-unit inventory in the $180,000–$350,000 range. Military corridor duplex/triplex buildings with military tenant base produce DSCR 1.10–1.35 at 70–75% LTV.
Jacksonville FL — Duplex DSCR:
Duval County’s relatively favorable Florida tax rate (1.2–1.4%) and accessible multi-unit pricing ($235,000–$380,000) produces duplex DSCR of 1.00–1.18 at 75–80% LTV — better than any other Florida metro.
Operating a Multi-Unit vs SFR: The Investor Perspective
Multi-unit investing introduces operational complexity that single-family does not:
Multiple tenants, multiple relationships. Lease expirations, turnover, and maintenance for 3–4 units require more management attention than a single-family. This is why quality property management is particularly important for multi-unit investments.
Shared systems: HVAC, plumbing, and roof issues affect all units simultaneously. Capital expenditure on a multi-unit building affects the entire investment when a system needs replacement.
Income resilience: 75% occupancy on a 4-unit building still generates 75% of gross rent — whereas a vacant SFR generates 0%. Multi-unit provides income resilience through diversification across tenants.
Exit flexibility: 2-4 unit buildings can be sold to owner-occupants (FHA allows owner-occupancy in 2-4 unit buildings), other investors, or eventually converted to different uses. The exit market is narrower than SFR but real.
Frequently Asked Questions
Can I owner-occupy one unit in a DSCR 2-4 unit loan?
No. DSCR is investment property financing — all units must be investment (rental) use. Owner-occupancy of any unit requires a different loan program.
What if one unit is vacant at the time of close?
Vacant units use appraiser market rent analysis as qualifying income. Partial vacancy at acquisition is standard and does not disqualify the deal.
Is a 5-unit building eligible for DSCR?
No. Residential DSCR programs cover 1-4 units. Five or more units is commercial multifamily with entirely different program parameters.
Does each unit need a separate lease for DSCR?
No. Some multi-unit buildings have leases for occupied units and vacant units that use market rent analysis. Mixed situations (some occupied, some vacant) are fully accommodated.
What is the reserve requirement for a 4-unit DSCR?
Typically 6 months PITIA post-close for standard DSCR. 12 months for no-ratio. On a 4-unit with $3,800/month PITIA at 6 months: $22,800 in liquid reserves required post-close.
About the Author: Mayer Dallal — Managing Director, Mbanc NMLS #38232. Multi-unit DSCR financing. [mbanc.com/blog/author/mayer-dallal/]
Not a commitment to lend. Mbanc NMLS #38232 | Equal Housing Opportunity Lender
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