The Quick Read: Add the qualifying short-term-rental income from every unit, then divide that total by one full monthly payment on the whole building: principal, interest, taxes, insurance, and any association dues. The lender decides which income figure counts, and it is often less than the raw Airbnb projection. Qualification runs primarily on property-level rental income covering the payment, subject to lender guidelines.
- Sum all units, divide by one PITIA. Never test unit by unit.
- The income number varies by lender: booking history, a data-service projection, or an appraiser’s rent schedule.
- 1.00 is where select programs start, not a universal standard. Stronger ratios open better terms.
- Short-term-rental purchases typically top out at 75% LTV, and cash-out at 70% on short-term-rental collateral.
- Clearing the ratio does not mean the building makes money.
Picture a fourplex with four furnished units. The ratio itself is simple arithmetic. The hard part is deciding which income number goes on top. This guide walks through the formula, the income choices, a worked fourplex, and the places where the standard method breaks.
Short-Term Rental Calculator
Run the STR numbers in your market
Rate source: Freddie Mac 30-yr average via FRED® — Federal Reserve Bank of St. Louis · effective Oct 15, 2026
Prefilled with starting assumptions — enter your nightly rate, occupancy, taxes, and insurance for a more accurate picture.
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.
What Does DSCR Measure on a Short-Term Rental?
DSCR measures whether a property’s rent covers its own monthly housing payment. For residential investor loans, the formula is qualifying monthly rent divided by PITIA. A result of 1.00 means income equals the payment. Above 1.00 means a cushion; below it means a shortfall.
PITIA stands for principal, interest, taxes, insurance, and association dues. Flood insurance counts when it applies. On an interest-only structure, the denominator shifts to the interest-only payment. Interest-only periods are available through select lenders in the network.
Notice what is missing. Repairs, vacancy, management, utilities, cleaning, and supplies do not appear. That is deliberate. The ratio tests payment coverage, not profit. This is the most common mix-up for investors coming from commercial real estate, where the same acronym means net operating income divided by debt service. Residential DSCR skips the operating-expense deduction. If a calculator asks you to subtract expenses first, it is using the commercial method, and its answer will not match a residential lender’s.
Two Formulas, One Name
Two calculations circulate under the DSCR label, and they answer different questions. Know which one you are running.
| Factor | Lender qualification DSCR | Investor NOI DSCR |
|---|---|---|
| Numerator | Rent or STR income the lender counts | Income minus operating costs |
| Denominator | Full PITIA | Debt service only |
| Expenses deducted | None | Management, repairs, vacancy |
| Answers | Does the file qualify? | Does the deal really cover itself? |
| Typical result | Higher | Lower |
Run both on any Airbnb building. The first tells you whether a lender will consider the file. The second tells you whether you will sleep well. On short-term rentals the gap between them is wide, because cleaning, supplies, platform costs, and turnover are heavy.
Where Does the Income Number Come From?
The income figure comes from one of three places, and the lender picks the method. Which one applies can swing the ratio more than anything else in the file.
| Income method | What it uses | Best fit |
|---|---|---|
| Booking history | Actual platform statements from the property | Seasoned hosts, refinances |
| Data-service projection | Comparable-listing estimates | Purchases with no history |
| Appraiser rent schedule | Long-term market rent | Standard rental programs |
A standard long-term-rental program will often count market rent rather than Airbnb revenue. A short-term-rental program counts STR income instead. Ask which method applies before you pick a lender. Across the wholesale network, short-term-rental files typically expect about 12 months of hosting experience and a 640+ credit score.
Understand what a projection measures. AirDNA’s help documentation explains that its revenue figure is nightly rates plus cleaning fees, minus service fees and discounts, and that Airbnb host fees are not included. So the headline number is not what lands in your account. Treat projections as estimates. Vault STR’s analysis of Rentalizer reports independent tests landing 15-30% off actual results, with misses skewing high. That is a secondary source, so use it as a caution, not a measurement. The practical takeaway: a lender that applies a haircut to gross projections is not being stingy. It is reflecting that the raw number runs optimistic.
For two- to four-unit properties, appraisers use Form 1025, which Fannie Mae’s Selling Guide lists as the small residential income property report. DSCR loans are not agency loans. The form name matters only because it carries the market-rent schedule.
Step-by-Step on a 2-4 Unit Building
Five steps cover the whole calculation.
1. Confirm the property is eligible. 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. Also confirm the structure is a conventional one. Manufactured homes, log homes, and barndominiums are not offered in these programs.
2. Estimate income for each unit. Run each unit’s projection or history separately. A studio and a three-bedroom do not earn alike, so never apply one blended figure.
3. Apply the lender’s adjustment. Lenders commonly count less than 100% of projected gross income. The factor differs by lender, which is why two quotes on the same building can return different ratios.
4. Total the building. Add the adjusted income from all units into one monthly number.
5. Divide by one PITIA. Use the full payment on the whole property, including association dues if any.
Here is the logic as ratios, not dollars. Say a fourplex has four units with similar projected income. After the lender’s factor, the combined qualifying income covers the building’s payment about 1.25 times. Cut the factor further, or drop one unit’s projection, and coverage slides toward 1.10. Nothing about the building changed. Only the assumptions did.
A Fourplex Worked Through
Run the numbers on a hypothetical fourplex, with every input a modeled assumption and not a market fact. Units A and B are one-bedrooms that project at the same level. Unit C is a two-bedroom that projects about 30% higher. Unit D is a larger three-bedroom projecting about 60% higher than the one-bedrooms.
Add those four projections and you have gross projected income for the building. Now apply a lender factor in the range many programs use. Suppose the adjusted total covers one full PITIA about 1.30 times at a 75% LTV purchase. The file clears the 1.00 floor comfortably. Each figure is subject to lender guidelines and a complete review of property type, leverage, and credit.
Now stress it. Remove 20% from every projection to model a soft season. Coverage falls to roughly 1.04. Remove another 10% and the file dips below 1.00. Sensitivity like this is why seasoned investors stress-test every deal before they commit: a file that clears 1.30 on the base case can land barely above 1.00 in a soft season, and a thinner base case would not survive the same test.
| Scenario (illustrative) | Income vs. base | Coverage |
|---|---|---|
| Base case | 100% | About 1.30x |
| Soft season | 80% | About 1.04x |
| Weak year | 70% | Below 1.00x |
| Added down payment | 100% | Higher than base |
The last row matters. A larger down payment lowers the payment and lifts the ratio. It never erases leverage caps, credit floors, reserve rules, or property eligibility, though. The strongest files clear both tests: enough equity and enough rental coverage.
Duplex and Triplex Variants
The math is identical, but each unit carries more weight. In a duplex, one weak unit is half your income. In a triplex, it is a third. A fourplex spreads the risk across four listings, which is one reason multi-unit buildings often show stronger coverage than single-family homes at similar prices.
The same logic works against you when one unit is vacant at application or runs without history. Lenders may count it differently from a seasoned unit. With a duplex, that single unit can decide whether the file reaches 1.00. If you are choosing between a duplex and a fourplex, model the downside of losing your best unit, not just the base case.
Mixed Buildings and Other Edge Cases
Here is where the general rule bends. Treatment is lender-specific, so treat the following as questions to ask, not settled answers.
Some units short-term, some long-term. Lenders may count the long-term units at lease or market rent and the short-term units under the STR method. How they blend the two varies by program. Ask before you assume.
A vacant unit. Some programs count market rent from the appraisal schedule for a vacant unit. Others want it leased or operating first. Confirm it before you contract.
An owner-occupied unit. DSCR loans are designed for non-owner-occupied investment properties. If you plan to live in one unit, a different financing route usually fits better. That is a house-hacking structure, and it belongs to a different program family.
No hosting history. Short-term-rental programs typically want about 12 months of hosting experience, though a first-time host may still have options through a standard rental program that counts long-term market rent. Refinances often lean on documented platform history. Cash-out files commonly expect about 6 months of seasoning.
Below 1.00. Coverage below 1.00 is available through select lenders in the network, with leverage and terms adjusted. It is a separate path from the programs that start at 1.00, not the same program with a lower floor. Expect reduced leverage.
Five units or more. The residential DSCR framework generally covers one to four units. Larger buildings move into commercial underwriting, which uses the NOI method.
Regulatory risk deserves one honest note. A vendor blog on DSCR lending for Airbnb investors observes that DSCR lenders typically do not price in local legality or HOA restrictions. A strong ratio on paper can still be undercut by a rule that limits your rental days. That risk sits entirely with the investor.
Why Passing DSCR Is Not the Same as Making Money
Clearing 1.00 is not positive cash flow. The ratio ignores repairs, vacancy, management, utilities, cleaning, supplies, and capital expenses. Short-term rentals carry those costs in volume.
Take that fourplex at 1.30x. Cleaning every turnover, furniture replacement, utilities across four units, platform fees, and a management company could easily consume the cushion. The lender reviews the payment coverage. You still have to cover the operating business.
A practical rule: treat the lender’s ratio as an entry ticket and your NOI ratio as the real decision. If your own conservative model shows the building at or below break-even after expenses, a passing lender ratio is not a reason to buy.
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.
Common Calculation Mistakes
- Using NOI where the lender uses gross. The two methods produce different numbers.
- Double-counting a haircut. If you cut projected income and the lender cuts it again, your model understates the real result.
- Leaving out association dues or flood insurance. Both belong in PITIA.
- Using peak-season income. Annualize across the full year.
- Blending the units. Run each one on its own, then add.
- Ignoring the projection’s own limits. A data service estimates; it does not guarantee.
How to Improve a Weak Ratio
Four levers move the number.
1. Raise qualifying income. Document booking history, or provide stronger comps for the projection.
2. Lower the payment. A larger down payment reduces the loan and lifts coverage. Most purchase files sit at 75%-80% LTV on standard rentals, while short-term-rental purchases top out at 75%. Terms vary by lender guidelines, property type, leverage, credit profile, and full file review.
3. Change the structure. Interest-only periods and extended terms are available through select lenders in the network and change the monthly payment the ratio is tested against.
4. Adjust the building. A different unit mix, or a property with lower association dues, changes both sides of the equation. Leverage, reserves, and pricing vary by lender and program; the final terms follow the full file review.
For an investor weighing leverage on the next building, Lendmire’s piece Standard vs Top-Tier DSCR Cash-Out LTV on a 2-4 Unit Property shows how the tiers differ.
Pre-Offer Self-Test
Before calling a lender, run through this list.
- Is short-term renting allowed on this property?
- Do you have a projection for each unit, plus a version cut by 20%?
- Do you know the full PITIA, including dues and flood coverage?
- Does the building clear 1.00 with the haircut applied, and 1.10 under stress?
- Does your own NOI model still work after cleaning, utilities, and management?
- Does the credit profile fit? Short-term-rental files typically want a 640+ score, with 700+ unlocking the strongest leverage tiers.
- Do you have the reserves? They vary by lender, leverage, and loan size, commonly around 6 months of PITIA.
Loan amounts on standard programs run up to $3,000,000, with smaller balances routed through select lenders in the network. The complete DSCR loans guide covers the full set of program mechanics.
Key Terms Defined
DSCR: the ratio of qualifying rental income to the monthly housing payment on the property.
PITIA: principal, interest, taxes, insurance, and association dues, the full monthly obligation.
ADR: average daily rate, the average nightly price a short-term rental actually earns.
Haircut: the reduction a lender applies to projected gross income before testing coverage.
NOI: net operating income, which is income minus operating expenses, used in commercial DSCR.
Frequently Asked Questions
Do I calculate DSCR per unit or for the whole building?
For the whole building. Add the qualifying income from all units and divide by a single PITIA. Testing each unit against a share of the payment is not how the residential calculation works, although you should still estimate each unit’s income separately to build the total accurately.
Can I qualify with no Airbnb history?
Often, yes, though the path depends on the program. Short-term-rental programs typically expect about 12 months of hosting experience. Without it, a standard rental program that counts long-term market rent may still apply. Qualification remains subject to lender guidelines and property review.
What happens if my DSCR is below 1.00?
Select lenders in the network offer coverage below 1.00, with leverage and terms adjusted. Expect lower leverage than a file that clears 1.00. It is a different path from the programs that start at 1.00, so compare the tradeoff before choosing it.
Does an owner-occupied unit change the calculation?
It changes the product, not just the math. DSCR loans are built for non-owner-occupied investment properties. If you intend to live in one unit, a different financing route usually fits better. After the occupancy condition is satisfied, converting the building to a pure rental often points back to a DSCR file.
Is AirDNA’s projection what a lender will count?
Not necessarily. Many lenders apply a haircut to the projection, and some use booking history or an appraiser’s rent schedule instead. Projections are estimates, and independent testing has found them running optimistic, so build your own number on a conservative footing.
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.
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. Lendmire arranges these loans as a broker through select lenders in its wholesale network across 41 markets, including Washington, D.C. Reach the team at 828-256-2183 to talk through your scenario. Investors focused on short-term rentals can also review DSCR loans for Airbnb and short-term rentals. For a multi-unit Airbnb, the right model is the one that still works after your own expenses are counted.
For current guidelines and terms, see Lendmire’s DSCR loan programs page.
About Lendmire
As a non-QM mortgage broker (NMLS# 2371349), Lendmire facilitates DSCR investor loans across 41 markets, including Washington, D.C. DSCR eligibility is generally reviewed around property-level rental income instead of personal income documentation, subject to lender guidelines, serving LLC-structured portfolios and self-employed borrowers who don’t fit conventional boxes. A two-time Scotsman Guide Top Mortgage Workplace (2025, 2026).
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References
1. AirDNA Help: How does AirDNA calculate revenue?
2. Vault STR: Rentalizer accuracy
3. Fannie Mae Selling Guide B4-1.2-01
4. Chalet: Building an Airbnb empire with DSCR loans
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 to Finance an Airbnb Through an LLC With a DSCR Loan · How to Finance a Rural Resort Unit as an Airbnb With a DSCR Loan · How to Get a DSCR Loan on One Unit in a Condotel Building
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
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- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Compliance and disclosures. Lendmire (NMLS# 2371349) is a licensed mortgage broker and is not a direct lender, depository institution, financial advisor, or tax professional. Content in this article is general market analysis and educational information — not financial, legal, or tax advice for any specific situation. Lendmire does not guarantee loan approval; every transaction is subject to underwriting by the funding lender. Mortgage pricing and loan program guidelines are subject to change at any time without notice and vary by borrower characteristics, property type, and state regulations. Lendmire complies with Equal Housing Opportunity. Licensure verification: NMLS Consumer Access.