Side by side
| Question | 2-4 unit DSCR | 5-10 unit DSCR / small-balance |
|---|---|---|
| Underwriting lane | Residential investor | Investor multifamily or small-balance commercial |
| How the ratio is usually measured | Gross rent ÷ full monthly payment | Gross rent ÷ payment, or NOI ÷ annual P&I; varies by program |
| Income documents | Leases and the appraiser's market rent schedule | Rent roll, leases and trailing 12-month operating statement |
| Appraisal | Sales comparison plus market rent | Income approach plus small apartment sales |
| Expense review | Taxes, insurance and dues | Full operating expenses, normalized |
| Program choice | Many wholesale programs | Fewer programs; unit-count and loan-size limits vary |
| Experience | Often flexible | Some programs want prior rental ownership |
| Where to start | dscrloanstexas.com | This site |
Why the line is at four units
Residential mortgage guidelines in the United States treat one to four units as residential property. Five units and up is commercial multifamily. DSCR programs grew up in the residential lane, so most of them stop at four units. A smaller group of wholesale lenders extended the rent-based approach to five-plus units, usually with commercial-style underwriting layered on top.
What it means for your numbers
On a fourplex, a lender typically compares gross rent with the full monthly payment. On a 5-10 unit building, many programs subtract operating expenses first: vacancy, management, repairs, owner-paid utilities and reserves. A building that shows comfortable coverage on gross rent can show thin coverage on NOI.
Illustration with user-style numbers: 6 units at $1,200 is $7,200 a month. Against a $5,900 total monthly payment, gross coverage is about 1.22. Subtract $1,900 a month of normalized operating costs (excluding taxes and insurance already in the payment), and coverage on that basis falls to about 0.90. Try your own building in the 5-10 unit DSCR calculator.
What it means for your paperwork
Expect to provide a certified rent roll, every lease, a trailing 12-month operating statement, utility bills, the tax bill and insurance quotes. On a fourplex, many of those are optional. Our guides on reading a rent roll and normalizing a T-12 show what underwriters look for.
Which should you buy?
That is an investment decision, not a financing one. Fourplexes have more programs and simpler underwriting; 5-10 unit buildings spread vacancy risk across more units and are often priced on income rather than on comparable house sales. If you are moving up, start by running both on the same rent and expense assumptions.
Comparisons are general and qualitative. Program terms vary by lender and change over time. Not a commitment to lend.