The Quick Read: A lender sizes Airbnb income on a duplex, triplex, or fourplex by picking an income source, adjusting it down, and dividing the result by the full monthly obligation on the building. That obligation is principal, interest, taxes, insurance, and any HOA dues (PITIA). The result is compared with the program’s coverage floor, which is 1.00 on short-term rental purchases and refinances in the select lenders Lendmire’s wholesale network uses.
- The income source is one of three: actual platform history, a third-party projection, or the appraiser’s long-term market rent.
- The lender’s adjustment applies to income only. PITIA stays whole.
- Short-term rental purchase leverage tops out at 75% LTV, and refinance and cash-out top out around 70% LTV, subject to lender guidelines.
- Expect a 640+ credit score and about 12 months of hosting experience on most files.
- Clearing 1.00 is not the same as positive cash flow.
A building with two to four units is a strange fit for a process designed around one house. Most explanations of short-term rental underwriting treat the property as a single income stream. A fourplex has four. This piece walks through how the number gets built, where the building-level view helps and hurts, and what an investor can do when the number comes up short. The complete DSCR loans guide covers the base product. This article covers the Airbnb layer on top of it.
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.
Key Terms Defined
PITIA: Principal, interest, taxes, insurance, and HOA dues. It is the full monthly obligation a DSCR loan tests against.
DSCR (debt service coverage ratio): Qualifying income divided by PITIA. It is a property test, not a personal income test.
ADR (average daily rate): The average nightly price a booked unit earns.
Haircut (income factor): The percentage a lender subtracts from gross short-term rental income before dividing by PITIA. It varies by lender.
Form 1007 and Form 1025: Appraisal forms. The 1007 is the single-family rent schedule. The 1025 is the operating income form for two-to-four-unit properties.
Rentalizer: AirDNA’s revenue estimator. It projects revenue, ADR, and occupancy from similar nearby listings.
What Does the Lender Actually Divide?
The lender divides one qualifying income number by one PITIA number. For a short-term rental, the qualifying income number comes from short-term evidence instead of a lease, and it is adjusted down before the division happens.
The formula itself never changes. Monthly qualifying income over monthly PITIA gives the coverage ratio. What changes on a short-term rental is the top of that fraction. A long-term rental uses a signed lease or the appraiser’s market rent. A short-term rental uses one of three evidence paths, and the choice of path can move the answer more than anything else on the file.
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. That is why the property’s income does most of the talking.
Why 2-4 Units Change the Sizing Question
A two-to-four-unit building is underwritten as one asset with one loan and one PITIA. The income from every unit is combined and divided by that single obligation. That is the general mechanic, and the exact treatment of mixed buildings depends on the program.
Two things make these buildings different from a single-family house.
First, there is more than one revenue stream feeding one number. A strong unit can carry a weak one. A fourplex with three busy units and one slow studio can still clear coverage. The reverse is also true: one strong unit rarely rescues three units with no history.
Second, the appraisal form changes. The 1025 is the form for two-to-four-unit rentals, while the 1007 handles single-family. The 1025 values the building on an operating income basis and treats rent on a traditional long-term footing. It does not naturally capture nightly rates. Whether a separate short-term rent opinion is available depends on the program and the lender.
Properties that fall outside these programs matter too. Manufactured homes, log homes, and barndominiums are not offered in the network’s DSCR programs, and that holds whether the building is one unit or four.
The Three Income Evidence Paths
Lenders pick from three evidence paths: actual platform history, a third-party projection, or the appraiser’s long-term market rent. Which one applies depends on whether the property is already operating, whether it is a purchase or refinance, and how the lender is built.
| Path | Best fit | What the lender needs | Weak spot on 2-4 units |
|---|---|---|---|
| Actual history | Operating building | About 12 months of platform or manager statements | New or converted units have no record |
| Third-party projection | New purchase or conversion | A revenue report from a data tool | One report may not reflect unit mix |
| Appraiser market rent | Fallback | 1007 or 1025 rent survey | Usually far below short-term potential |
Actual history. This is the strongest evidence because it is real money. A lender reads twelve months of platform payouts or property-manager statements and uses the trailing figure. It matches the roughly 12 months of hosting experience most short-term rental programs expect. A screenshot of a dashboard is not the same as a statement. Lenders want documents that show the property, the period, and the amounts.
Third-party projection. AirDNA’s Rentalizer is the usual tool. Per AirDNA’s help center, it estimates revenue, ADR, and occupancy from the historical performance of similar nearby active listings. AirDNA’s Airbnb calculator page says it matches comparable listings within a 10-mile radius on bedroom count, bathroom count, and guest capacity, then weights them by similarity and adjusts for seasonality and demand.
One detail matters for how you read the output. AirDNA’s own site describes its revenue figure as host revenue: nightly rates plus cleaning fees, minus discounts and platform fees. It is not the guest’s checkout total. Occupancy excludes nights the host blocked. So the projection already reflects some leakage before the lender touches it.
Appraiser market rent. This is the fallback. The appraiser estimates what the unit would rent for on a traditional 12-month lease. On most markets that number sits well below what a busy short-term unit earns, so a file that leans only on the appraiser’s rent has a harder time reaching the coverage floor.
Per-Unit or Whole-Building: How the Number Gets Built
Whole-building sizing is the norm, but the evidence behind it is built unit by unit. Comps match on bedrooms, bathrooms, and guest count, so a studio and a three-bedroom in the same building draw different comparables and different revenue estimates.
Here is how that plays out in practice.
Unequal units. A fourplex with two studios, a one-bedroom, and a two-bedroom does not get one comp set. Each unit type pulls its own comparable listings, and the unit-level estimates roll up into the building’s total. Reports that treat the whole building as “four units” without separating the mix tend to overstate or understate.
Mixed strategies. Some owners run two units as short-term rentals and leave two on annual leases. The leased units use the lease or the appraiser’s rent. The short-term units use history or a projection. Each stream gets the evidence that fits it, and the combined figure goes over the single PITIA. Whether a given program accepts a mixed building depends on the lender, and this is a place where the wholesale network’s range of programs matters. Some lenders are conservative and want short-term units to show history. Others use projections freely.
Partial history. Say one unit has twelve months of platform income and the other three were just converted. Lenders can credit the proven unit on history and the new units on projection or market rent, depending on the program. Conversions without a record are where files most often get stuck.
Owned versus purchased. A projection is weaker evidence on a building you already own, because the lender can see what the units really earn. A new purchase has no history to see, so a projection carries more weight there.
The Appraisal Gap
The 1025 does not capture nightly income, so the file needs something to fill the gap. On a duplex, triplex, or fourplex, the appraisal form values the building and opines on long-term rent. It was not built to model Airbnb revenue.
What fills the gap depends on the program. Some lenders accept a separate short-term rental analysis. Some rely on the platform history or projection and use the appraisal only for value and collateral. Others fall back to the appraiser’s market rent, which is where the building’s coverage often drops.
Ask the question early: if the appraisal rent comes back lower than expected, can the file still use history or a projection? The answer differs by lender, and it decides whether the file lands.
Adjustments Between Gross and Qualifying Income
The lender takes the gross figure and reduces it before dividing. That reduction, often called a haircut, is a lender-set factor. It hits only the numerator. PITIA is never discounted.
The reasons behind it are practical. Vacancy and seasonality swing short-term income far more than a lease does. Platform fees, cleaning, and management sit between the guest’s payment and the owner’s pocket. A lender that applies a factor is building in margin for those gaps.
Here is why this matters. Lenders do not all use the same factor, so two lenders can quote different coverage on the same building. In a worked-ratio sense: a building showing 2.0x on gross income falls to 1.60x after a 20% factor. Market reports commonly describe factors in the range of roughly 20% to 25%, but the factor on any given file depends on the lender and the evidence path. Across the wholesale network, the spread between lenders is wide enough that shopping the same file can change the coverage result.
The coverage floor on short-term rental purchases and on refinances is 1.00 in the programs Lendmire places files with. Stronger ratios open better pricing and leverage. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted. Both are different paths, not one program with a moving floor.
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.
Worked Example: Fourplex, Modeled Ratios
The example below uses modeled ratios, not market data. It shows how the pieces combine.
Picture a fourplex purchase at 75% LTV, the top of the short-term rental purchase range. Two units are one-bedrooms, one is a studio, and one is a two-bedroom. Each unit gets its own comp set. The projection rolls up to a building total. These specifics are subject to lender guidelines and a full review of property, leverage, and credit.
| Step | What happens | Modeled result |
|---|---|---|
| 1 | Unit-level projections combine | Building gross income |
| 2 | Lender applies its factor to gross | Qualifying income drops |
| 3 | Divide by single PITIA | Coverage ratio |
| 4 | Compare with 1.00 floor | Pass or fail |
Run the numbers this way: assume the gross projection covers PITIA at 1.35x. A 20% factor takes that to 1.08x. The file clears 1.00 with thin margin. If the lender’s factor is 25% instead, the same file lands near 1.01x. Same building, same projection, nearly no room.
Now run the failing version. Assume the projection covers PITIA at 1.20x. A 20% factor brings it to 0.96x. That is below 1.00 on short-term income alone.
The levers for that file are real, though each is subject to lender guidelines and credit approval:
- Change the evidence path. If the building has twelve months of actual history that beats the projection, the lender may use it.
- Change the lender. A lender with a smaller factor produces a higher ratio on the same income.
- Lower the leverage. A larger down payment lowers the monthly payment and can lift the ratio. It does not erase leverage caps, credit floors, or reserve rules.
- Use a sub-1.00 path. Coverage below 1.00 is available through select lenders in the network, with leverage and terms adjusted.
- Change the structure. Extended terms such as 40-year and interest-only periods are available through select lenders, which changes the payment side of the fraction.
DSCR files that run thin on short-term coverage often clear when the investor documents actual history instead of leaning on a projection, or when the file is routed to a lender with a lighter factor. The first step is knowing which lever applies. Lendmire’s wholesale network exists to run that comparison.
Documentation Checklist for a 2-4 Unit Short-Term Rental File
Clean documents leave fewer preventable gaps. Clean does not mean approved, but it removes the avoidable delays.
1. Platform or manager statements showing the property, the period, and the payouts. Twelve months where history is the path.
2. A projection report broken out by unit type where the building has mixed units.
3. The appraisal, on the 1025 for two-to-four-unit properties, with any short-term rent analysis the program allows.
4. Proof of hosting experience, since most short-term programs expect about 12 months.
5. Entity documents if the building is held in an LLC, subject to lender program eligibility.
6. Reserves documentation. Reserves vary by lender, leverage, loan size, and transaction type. Around six months of PITIA is common. Conservative rate-term files at modest leverage under $1,500,000 can see reserves waived. Larger loans typically step up to about nine months.
7. Permit and licensing evidence for each unit. Short-term rental rules can vary by city, county, HOA, and property type, so investors should confirm local rules before relying on projected rental income. A unit that cannot legally operate as a short-term rental may not be able to count that income at all.
Where Multi-Unit Files Stall
Most delays come from a handful of repeat issues.
- A single unit holds the permit. The other units cannot be counted as short-term income.
- Conversion without history. The lender wants a record the building does not have yet.
- A one-line projection on a mixed building. The report does not break out unit types, so the income looks inflated.
- Appraisal rent far below the projection. A program that leans only on the appraisal can cut the ratio sharply.
- Credit or reserves short of the tier. Short-term rental files expect a 640+ score, and the strongest leverage needs more.
Lender View vs. Your Own Pro Forma
The lender’s number is a sizing tool. It is not a profit forecast. DSCR compares qualifying income to PITIA only. Cleaning, shared utilities, management fees, repairs, vacancy, and capital expenses all sit outside the calculation.
So a building that clears 1.00 can still lose money. And a building that fails a lender’s factor may still be profitable on the investor’s own pro forma. The two views answer different questions. The lender asks whether the income covers the debt. The investor asks what is left over.
There is also a definitional trap. Many education sites define DSCR as net operating income over debt service. Residential DSCR loans typically divide qualifying income by PITIA. The ratios are not comparable, so a coverage number from one context should not be read against the other.
Tax treatment can depend on how the funds are used and how the property is held; investors should keep clear records and speak with a qualified tax professional before relying on any deduction.
For national context, AirDNA’s U.S. Market review reports 57.2% occupancy and a $258.91 average daily rate across 1.73 million listings. That is a national average and varies widely by market, so it says little about any one building.
Frequently Asked Questions
Does the lender size each unit separately or take one building number?
The loan is one asset with one PITIA, so the lender uses one combined income figure. The evidence behind it is often built unit by unit, since comps match on bedrooms, bathrooms, and guest count. Treatment of mixed buildings depends on the program.
Can I mix short-term and long-term units in the same building?
Often yes, depending on the lender. Leased units use the lease or appraiser rent, and short-term units use history or a projection. The two income types combine over the single PITIA. Some conservative programs want the short-term units to show history.
What if the appraiser’s rent comes in low?
Ask early whether the file can still use platform history or a projection. Some programs can. Others fall back to the appraisal rent, which usually sits well below short-term potential and makes the floor harder to reach. Related reading is Lendmire’s piece What Counts As Short Term Rental Income For A Lender?.
Is a projection enough, or do I need history?
It depends on the lender. A projection can carry a new purchase, since there is nothing to show yet. Programs also commonly expect about 12 months of hosting experience from the borrower. A projection is weaker evidence on a building you already own, because actual earnings are visible.
Does a ratio of 1.00 mean the building is profitable?
No. The ratio compares income to PITIA only. Repairs, vacancy, management, utilities, and capital costs are outside it, so a building can clear 1.00 and still run negative.
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. Reach the team at 828-256-2183 or request a quote. Program terms are typical ranges from select lenders in the network, vary by borrower and property, and are not a commitment to lend.
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. AirDNA Help Center – Rentalizer Revenue Calculator
3. AirDNA – U.S. market review via Rentalizer Agent
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: How a Short-Term Rental Loan Works on a 2-4 Unit Property · Airbnb vs Long-Term Rental: Which Is Easier to Finance? · How a Short-Term Rental Loan Works on a Ski-Town Property
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
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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.