Can You Use a DSCR Loan for a Duplex You'll Airbnb?
Yes — DSCR loans generally cover 2-4 unit properties, and a duplex run as a short-term rental typically has both units' projected STR income combined and compared against the combined PITIA for the whole property to compute one ratio.
NightYield Editorial
STR-DSCR research & underwriting desk
Published 2026-07-18
How a duplex STR gets qualified
Standard DSCR programs typically extend to properties with two to four units, not just single-family homes, which puts a duplex squarely inside eligible property types. When both units are being operated as short-term rentals, the projected income for each unit — generally following the same comp-based methodology used for a single-family STR — gets combined into one total projected revenue figure for the property.
That combined revenue is then compared against the combined PITIA for the entire duplex, since the mortgage covers the whole property rather than each unit separately. The resulting single DSCR reflects the property as one economic unit, even though it physically houses two separate rentable spaces.
This combined-property approach is worth internalizing early, because it means a duplex can't be evaluated unit-by-unit the way an owner might naturally think about it — one strong unit can offset a weaker one within the same ratio, but a lender isn't underwriting two separate mini-loans against two separate mini-incomes.
The quirk worth knowing: mixed strategies across units
It's common for a duplex owner to run one unit as a short-term rental and the other as a standard long-term lease — living in neither, or living in one and renting the other. In that scenario, the STR unit's income typically follows the STR revenue methodology (comps, trailing-12-month data, any applicable night-cap adjustment), while the long-term unit's income is generally based on an actual or market-rate lease. Both feed into the same combined DSCR.
What to confirm before underwriting a duplex STR
Confirm local STR legality applies the same way to a duplex unit as it would to a single-family home — some ordinances treat multi-unit properties differently, particularly around owner-occupancy requirements for one of the units. Also confirm your specific lender's approach to blending STR and long-term income if you're running mixed strategies across the two units, since documentation requirements differ between the two income types.
Key takeaways
- Duplexes are generally eligible for standard DSCR programs, which typically extend to 2-4 unit properties.
- Both units' projected income combine into one figure, compared against one combined PITIA for a single DSCR.
- Mixed strategies — one unit STR, one unit long-term — are common and generally both feed the same combined ratio.
- Confirm local STR ordinances don't treat multi-unit properties differently, especially around owner-occupancy rules.