The Quick Read: A detached casita can run as a nightly rental or a year-long lease on a DSCR loan, and the better path is the one whose income the lender can document and whose legal status holds up. Long-term leases are the simpler file to document; nightly income can show stronger coverage on paper but needs more evidence and a clean legal footing.
- Long-term path: qualifying income is typically a lease or the appraiser’s market rent.
- Short-term path: select programs expect about 12 months of hosting history and a 640+ credit score.
- Short-term purchase leverage tops out at 75% LTV; short-term cash-out and refinance top out around 70%.
- Legal status of the casita (zoning, permits, HOA) decides whether the nightly option exists at all.
- Clearing a coverage ratio is not the same as positive cash flow.
The honest answer on who each option is for: a long-term tenant suits the investor who wants a clean, lease-backed file and steady carry. An Airbnb suits the investor with a legal short-term unit, real hosting records, and the appetite to run it as an operating business. Neither wins on every file.
Short-Term Rental Calculator
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Rate source: Freddie Mac 30-yr average via FRED® — Federal Reserve Bank of St. Louis · effective Oct 15, 2026
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Short-term rental income is documented with a 12-month history or a market data report. Program parameters update from Lendmire’s centralized guideline source.
As of Oct 15, 2026 · General Freddie Mac market benchmark, not a Lendmire loan offer. Nightly rate, occupancy, taxes, and insurance are editable estimates. 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.
Side-by-Side
The table below compares how each strategy shows up in a DSCR file. The long-term column reflects what most programs in the wholesale network look for; the short-term column uses the network’s verified short-term parameters. Program details vary by lender and every file is underwritten individually.
| Factor | Long-Term Tenant | Airbnb (Short-Term) |
|---|---|---|
| Review basis | Property rent vs. full monthly obligation | Property rent vs. full monthly obligation |
| Income evidence | Lease or appraiser market rent | Hosting history or projection, per program |
| Hosting experience | Not usually a factor | About 12 months expected |
| Credit floor | Around 620-660 in much of the network | 640 minimum |
| Purchase leverage | Typically 75%-80% LTV | Up to 75% LTV |
| Cash-out / refinance | Cash-out around 75% LTV | Around 70% LTV |
| Coverage floor | 1.00 where select programs start | 1.00 on purchase and on refinance |
| Entity vesting | LLC common, subject to lender program eligibility | Same, plus license in entity name where required |
| Reserves | Commonly around 6 months of PITIA, varies | Varies by lender, leverage, and loan size |
Reserve and leverage figures move with loan size and transaction type. Conservative files at modest leverage can see reserves relaxed, and larger loans typically step up. For the full framework, see the complete DSCR loans guide.
First, What Counts as a Casita
A casita is a regional label, not a legal category. HUD Mortgagee Letter 2023-17 describes an ADU as a habitable unit with separate entry that is subordinate in size and can be detached from the main dwelling.
Those are agency definitions. They do not set DSCR rules. DSCR loans are business-purpose loans for non-owner-occupied investment property, and each program in the network sets its own guidelines. The definitions matter for one reason: they show what a lender will ask. Is the unit habitable, separate, and legal?
How the Lender Reads the Property
Whether a detached casita reads as one property with an accessory unit or as a two-unit property is a program question. It changes which appraisal form is ordered and how the rent is counted. A one-unit property is typically handled on the single-family rent schedule, Form 1007. Two- to four-unit properties use Form 1025. HUD’s letter names both forms in this context.
Ask the question before choosing a strategy. If the casita’s income counts toward the coverage figure, it can lift coverage. If it only counts as cushion, the main house has to clear on its own. The conservative planning approach is to clear coverage without the casita and treat its income as upside. That keeps the file clean if a program discounts or ignores the unit.
When the Long-Term Tenant Is the Better Fit
The long-term tenant is the better fit when documentation, legal certainty, or low operating effort drive the decision. The file is simple: a signed lease, or the appraiser’s market rent when the unit is vacant. Many programs use the lower of lease rent and market rent, so a lease above market does not stretch the number.
This path works best in these situations:
- The casita’s short-term legality is unclear. If zoning, a license, or HOA rules are uncertain, a lease removes the question.
- The investor is new to hosting. Short-term programs expect about 12 months of host history. Without it, the long-term path has fewer gates.
- The main house carries the loan. When the main house clears coverage by itself, a lease on the casita adds documented, durable income.
- Credit sits near the floor. Long-term files are available at the lower credit tiers in parts of the network. Short-term files start at 640.
- Leverage matters. Long-term purchases can reach 75%-80% LTV on most files, and select high-leverage programs reach 85% with roughly a 700+ score. Short-term purchase tops out at 75%.
The weak spot is the rent schedule. The appraiser’s market rent can sit well below what nightly stays might gross. If the lease path produces coverage below 1.00, some select lenders in the network will review the file at lower coverage, with leverage and terms adjusted. That is a separate path from programs that start at 1.00, not a moving floor inside one program.
When the Airbnb Is the Better Fit
The Airbnb is the better fit when the casita is legally permitted for nightly use, the market supports it, and the investor can show hosting records. Gross nightly income can exceed long-term rent by a wide margin, and that can lift the coverage ratio. But the file asks for more.
The evidence side is heavier. Typical support is a platform or property-manager history tied to bank deposits. Purchases of a unit with no history lean on a market-data projection where a program accepts one. Programs differ on which they take, and select programs expect the 12 months of hosting experience noted above.
The appraisal rent does not solve this. Fannie Mae‘s appraiser update says the Form 1007 rent schedule was not designed for single-family properties used as short-term rentals. So nightly income has to come from somewhere other than the standard rent opinion, and lenders usually apply an expense factor to gross nightly income before running the ratio. A gross figure that looks like 2.0x can shrink noticeably after that haircut. Nightly income that clears only before the factor is a trap.
This path works best when:
- Legal status is documented. Permit, license, and HOA or CC&R language are in hand before the file goes in.
- Hosting history exists. A year of records beats a projection.
- Leverage needs are modest. Short-term purchase leverage tops out at 75% LTV, and refinance sits around 70%.
- The investor can absorb volatility. Coverage can pass while cash flow stays thin after cleaning, utilities, platform fees, and vacancy. The exact numbers vary by lender and program and follow a full review of property, leverage, and credit.
Run the Same Casita Both Ways
Take a modeled property: a main house on a lot with a detached casita, financed on a purchase at 75% LTV. On the long-term path, the file uses a lease or market rent, and coverage lands in a modest range, say just above 1.0x. On the short-term path, gross nightly income might push the unadjusted ratio to around 1.6x, but after an expense factor the program applies, the usable ratio falls toward the 1.3x range. These are modeled assumptions, not market data. Final terms depend on the lender’s guidelines, the property type, and the borrower’s complete credit picture.
Two lessons come out of that. First, the short-term number is higher but less certain, and it depends on documentation the long-term file does not need. Second, DSCR compares rent to PITIA only. Clearing 1.00 is not positive cash flow. Repairs, vacancy, management, utilities, and capex all sit outside the calculation, and nightly hosting carries more of them.
Prudent underwriting on a nightly file means testing it as if the unit were leased long-term. If the file still works, the investor has a fallback if rules or demand change.
Legal Gates Before Anything Else
Legal status is the gate for the short-term path. Lenders in the DSCR space ask whether the stays you plan are permitted where the property sits.
HOAs add a second layer. Many restrict nightly stays and can change rules after purchase. A minimum stay of 30 days or more can leave a mid-term approach open. Check the governing documents before the offer, not after.
Documentation Checklist by Strategy
| Document | Long-Term Tenant | Airbnb |
|---|---|---|
| Entity documents | Operating agreement if vested in an LLC | Same, plus license in entity name |
| Income evidence | Signed lease, or appraiser market rent | Platform or manager statements, bank deposits |
| Legal status | Certificate of occupancy where relevant | Permit, license, HOA or CC&R review |
| Rent split | Casita lease shown separately | Income split by structure |
| Insurance | Landlord policy for the detached unit | Policy that covers paying guests |
| Reserves | Asset statements | Asset statements |
Split income by structure when the main house and casita both produce rent. A clean rent roll shows which dollars belong to which unit. Insurance is the quiet failure point. A standard homeowner policy often does not fit a paying occupant in a detached structure, and a quote that arrives late can change the numbers during review.
Mixed Use and Switching Strategies
Plenty of owners run one structure long-term and the other nightly. Whether a program counts the casita’s nightly income, and at what percentage, is the program’s call. Plan the file so the main house clears coverage alone.
Switching later raises its own questions. A mid-term setup with stays of 30 days or longer can be a middle path when local rules block nightly use. Raise the plan with the broker before the loan, not after. Lendmire’s piece Airbnb vs Long-Term Tenant in an ADU for a First DSCR Loan covers the first-time version of this choice, and its piece Projected STR Income vs Rental History for a Long-Term-to-Airbnb Conversion covers the evidence question for a switch.
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.
Key Terms Defined
Casita: a regional word for a small detached or attached living unit, usually a type of accessory dwelling unit.
ADU (accessory dwelling unit): a habitable unit on the same parcel as a main home, with its own living, sleeping, cooking, and bathroom facilities.
DSCR: the property’s monthly rent divided by its monthly principal, interest, taxes, insurance, and any HOA dues.
PITIA: principal, interest, taxes, insurance, and association dues, the full monthly cost of owning the property.
Form 1007 / Form 1025: appraisal forms reporting market rent for single-family properties and for two- to four-unit properties.
Expense factor: a reduction some programs apply to gross nightly income before the coverage ratio is calculated.
A Balanced Verdict
Pick the long-term tenant when legality is uncertain, hosting history is missing, credit is near the floor, or the investor wants the simplest file. Pick the Airbnb when the casita is clearly permitted, hosting records exist, and the coverage number still holds after the expense factor. If both clear, run the long-term version as the downside case.
Neither choice removes the limits that sit outside the rent: leverage caps, credit floors, reserve rules, and property eligibility. A larger down payment can lift the ratio, but it does not erase those. Investor guidelines change and every file is reviewed individually, not a commitment to lend.
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. Tax treatment varies; consult a qualified professional.
Frequently Asked Questions
Does a detached casita count toward the DSCR number?
It depends on the program. Some treat the casita as part of a one-unit property with an accessory unit, others as a second unit, and the treatment changes how rent is counted. The safer plan is to clear coverage on the main house alone and treat the casita as upside.
Can the appraiser use nightly rates for the rent figure?
Not on the standard rent schedule. Nightly income is documented separately, through history or a projection, depending on the program.
What does a short-term casita file need that a lease file does not?
Typically about 12 months of hosting history, a 640+ credit score, proof of legal short-term use, and insurance that fits paying guests. Purchase leverage tops out at 75% LTV and refinance around 70%.
Is a casita automatically a legal rental unit?
No. Permits and certificates of occupancy decide it, and rules vary by city and county.
Does clearing 1.00 mean the casita makes money?
No. The ratio compares rent to PITIA only. Vacancy, repairs, management, utilities, and cleaning sit outside it, and nightly hosting carries more of them.
About Lendmire
Lendmire — NMLS# 2371349 — is a DSCR and non-QM mortgage brokerage with investor loan programs in 41 markets, including Washington, D.C. DSCR eligibility is commonly reviewed by the lender around property-level rent rather than personal income documentation, subject to lender guidelines, and the brokerage helps arrange financing for LLC-owned portfolios beyond conventional financed-property limits. Recognized by Scotsman Guide as a Top Mortgage Workplace in 2025 and 2026.
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References
1. HUD Mortgagee Letter 2023-17
2. Fannie Mae
This article is part of Lendmire’s short-term rental loan program — full qualification details, guidelines, and scenarios live on the program page.
Related reading: Should a Landlord Move a Long-Term Rental Mortgage to a DSCR Loan? · Is the Down Payment Higher on a Short-Term Rental DSCR Loan? · Can an Owner Refinance on DSCR Soon After Converting From Airbnb?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Important disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage brokerage. Lendmire is not a direct lender, depository institution, or financial advisor. All loan inquiries are subject to lender underwriting; this article does not constitute a commitment to lend. Rates, terms, and program guidelines are subject to change without notice and vary by borrower profile, property type, and state. Information in this article is general in nature and is not financial, legal, or tax advice. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.