The Quick Read: With no booking history, the lender substitutes projected income: you take a market-data estimate, reduce it by the lender’s income factor, convert it to a monthly figure, and divide by the full monthly PITIA, meaning principal, interest, taxes, insurance, and association dues. Then you compare the result with the program’s minimum.
- The formula matches a long-term rental. The income source and the lender’s adjustment to it are what change.
- Many select short-term-rental programs start at 1.00 coverage on a purchase. A separate select-lender path takes coverage below 1.00, with leverage and terms adjusted.
- On the strongest short-term-rental purchase files, leverage reaches 75% LTV, with a 640 credit score as the typical floor.
- Clearing 1.00 does not mean the property produces positive cash flow. Repairs, vacancy, management, and utilities sit outside the ratio. These specifics are subject to lender guidelines and a full review of property, leverage, and credit.
What Is the DSCR Formula Actually Measuring?
DSCR asks one question: does the property’s income cover its debt payment? A result of 1.00 means income matches the payment exactly. Below 1.00 means a shortfall, as Wikipedia’s explanation of the debt service coverage ratio puts it. The same source notes that non-QM and investor-focused lenders may allow lower ratios.
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.
Non-QM means the loan sits outside standard owner-occupied mortgage rules. 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.
An Airbnb with no operating history has a problem. There are no past bookings, no tax-return income, and no deposits to review. The qualifying income has to come from somewhere else, usually a third-party model or an appraiser’s rent analysis. That makes the choice of income source the biggest lever on your ratio.
Which DSCR Formula Do Lenders Use?
Lenders on residential investor files divide rent used for lender review by the full PITIA. The commercial textbook version divides net operating income by principal and interest only. Mixing the two is a common reason online calculators disagree.
| Factor | Lender view | Investor view |
|---|---|---|
| Top of the fraction | Qualifying income | Net operating income |
| Bottom of the fraction | Full PITIA | Annual debt service |
| Expenses subtracted first | Only the lender’s factor | Operating costs |
| Best used for | Qualifying for the loan | Judging the deal |
Use the lender view to estimate whether you may qualify, subject to lender guidelines. Use the investor view to help judge whether you should buy. A deal can look thin on the lender view and still be sound, or look strong there and still be a poor investment.
This article runs the lender view. The calculator on this page is an illustrative estimate only, and your actual file is reviewed subject to lender guidelines.
Where Does Income Come From With No History?
A property with no history is qualified on projected income, and the lender decides which projection it accepts. Across the wholesale network Lendmire works with, programs generally fall into three paths. A fourth path, actual history, takes over once the property has a track record.
| Income source | When it is used | Main drawback |
|---|---|---|
| Market-data projection | Purchase with no history | Modeled, not verified |
| Appraiser’s STR rent analysis | Purchase, often with a projection | Depends on appraiser’s experience |
| Long-term market rent | Fallback or reality check | Can understate STR income |
| Trailing actual history | Refinance, cash-out | Needs a track record |
The appraisal forms involved are labeled 1007, a single-family rent schedule, and 1025, a small residential income property report. Which one applies depends on the property type and the program.
Some lenders accept only one of these sources. Others accept either. Programs differ here more than on almost anything else, so ask before you write an offer.
How Do You Calculate It Step by Step?
Start with the projection, apply the lender’s factor, convert to a monthly figure, build the PITIA, and divide. The example below is a modeled assumption, not a market fact. It uses ratios instead of dollar amounts so you can follow the logic with your own numbers.
Step 1: Pull the projection. Enter the address, bedrooms, bathrooms, and guest count into a projection tool. AirDNA’s Rentalizer searches for comparable listings within a 10-mile radius. It picks them by proximity and by matching bedroom, bathroom, and guest-count setup, then takes a weighted average. The output is projected annual revenue, average daily rate (ADR), and occupancy.
Step 2: Understand what the revenue includes. AirDNA’s revenue methodology counts nightly rates plus cleaning fees, minus service fees and discounts. Revenue equals booked days multiplied by ADR. Host fees and some other charges are not in the data, so the figure is not your take-home.
Step 3: Convert to monthly. Divide annual projected revenue by 12. Then apply the lender’s income factor, which is a percentage reduction. That reduction stands in for vacancy and operating friction. The size varies by program, so get it from the lender before you finalize your numbers.
Step 4: Build the PITIA. Add principal and interest, property taxes, hazard insurance, flood insurance where it applies, and association dues. Principal and interest depend on loan amount, term, and whether the loan is interest-only.
Step 5: Divide. Qualifying monthly income divided by monthly PITIA gives the DSCR. Compare it with the program minimum.
Step 6: Read the result. Here is a modeled example. Say the raw projection covers the full PITIA 1.40 times. A lender factor that trims income by 20% leaves 1.40 × 0.80 = 1.12. That ratio clears a 1.00 floor with some room.
The same property run on raw revenue looks stronger than it is. An investor who skips Step 3 overstates the ratio every time.
How Much Does the Lender’s Factor Move the Number?
It moves it a lot. The table below holds the payment constant and varies only the income reduction. The reduction percentages are modeled stress levels. They are not figures any specific program applies.
| Raw projection covers PITIA | 10% reduction | 20% reduction | 30% reduction |
|---|---|---|---|
| 1.10x | 0.99x | 0.88x | 0.77x |
| 1.25x | 1.13x | 1.00x | 0.88x |
| 1.40x | 1.26x | 1.12x | 0.98x |
| 1.60x | 1.44x | 1.28x | 1.12x |
Look at the 1.25x row. A 10% reduction clears 1.00 comfortably. A 20% reduction lands exactly on it. A 30% reduction falls short.
This is why two lenders can produce different ratios on the same property. The formula is identical. The haircut is not. If you are choosing between programs, compare how each one treats projected income before you compare anything else.
How Do You Vet a Projection Before You Trust It?
Treat any projection as a modeled estimate built from comparable listings. It is not verified booking data for your property. Accuracy tends to be better in large, active markets and more variable in small ones, and market-level accuracy does not guarantee property-level accuracy.
Check these before you rely on the number:
- Comp match. Compare bedroom count, guest capacity, amenities, and location against your property.
- Outliers. One exceptional listing can pull a weighted average upward.
- Blocked calendars. Owner-blocked dates can inflate occupancy figures in second-home markets.
- Seasonality. A strong peak season can hide a weak shoulder season.
- Spread of results. A tight cluster of comps is more reliable than a wide scatter.
- Fee gaps. Remember that some host-side fees are outside the data.
Then run three versions. Use a conservative case, a base case, and an aggressive case. Only the first two should drive your offer.
Underwriters may filter or adjust comps, and some lenders will not change the comp set at all. If the projection comes in far below your expectation, the lender will generally still default to it. Your belief that the property can earn more does not change the coverage figure.
Where Does the General Rule Break?
The general rule is projection for purchases, history for refinances. Several situations bend it.
Purchase versus refinance. A refinance of an existing short-term rental generally looks at actual trailing income, often tied to bank deposits. Refinance leverage on short-term-rental collateral tops out around 70% LTV, and the coverage floor is 1.00. A purchase can reach 75% LTV on the strongest files, also with a 1.00 floor on purchases. Do not blend the two. They are separate programs with separate limits.
Projection swings. Projections can drop sharply from one pull to the next as the comp set changes. A deal that works on one pull can fail on the next. Pull the report close to the time you make your offer and again when the file goes to a lender.
Permit problems. If a short-term-rental permit is pending or not yet issued, the lender may be unable to rely on short-term-rental income at all. The file may then fall back to long-term rent. 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.
Mid-term rentals. These are often handled like short-term-rental acquisitions, with a projection used to qualify. Treatment varies by program.
Experience. Short-term-rental programs usually expect about 12 months of landlord or host experience from the borrower. A first-time host with no history on either side faces a narrower menu.
Property type. Manufactured homes (single- and double-wide), log homes, and barndominiums are not offered in the network’s DSCR programs, however strong the projection.
Coverage below 1.00. Programs below 1.00 coverage are available through select lenders in the network, with leverage and terms adjusted. Most standard programs start at 1.00. Expect a lower LTV and different terms on the sub-1.00 path.
Practitioner pattern: on files like these, the lender’s projection often lands below what the buyer expected. The files that go smoothly usually started with a self-run ratio built on the conservative case, not the asking price.
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.
What If the Ratio Comes In Too Low?
A low ratio can be fixed from either side of the fraction. Each lever below has an effect you can model.
- Lower the price. A smaller loan means a smaller payment. That lifts coverage directly.
- Put more down. A larger down payment lowers the loan. Cutting leverage from 75% to 70% shrinks the loan by about one-fifteenth. If principal and interest were the whole payment, a 1.12 ratio would rise to about 1.20. Taxes and insurance do not shrink, so the real lift is smaller. A bigger down payment never erases leverage caps, credit floors, or reserve rules.
- Change the structure. Interest-only periods and 40-year terms are available through select lenders in the network. Both lower the monthly payment. Some investors also prefer ARM structures, which exist in the network.
- Change the income method. If a projection is low, an appraiser’s short-term rent analysis may tell a different story. Programs vary on whether they accept it.
- Run the long-term rent test. Compute the ratio on long-term market rent as a fallback and a reality check. If it clears 1.00 on long-term rent alone, you have a safer floor under the short-term plan.
- Pick a different property. Sometimes the best fix is another listing.
Reserves also matter. They vary by lender, leverage, loan size, and transaction type, and a figure around six months of PITIA is common. Larger loans typically step up.
Keep both tests in mind. The strongest files have enough equity and enough rental coverage. Loan sizes on standard programs run up to $3,000,000, and smaller balances route through select lenders in the network.
What Changes After the First Year?
After roughly a year of hosting, actual income replaces the projection. A refinance then looks at trailing results rather than modeled ones. If the property outperformed the model, your ratio can improve. If it underperformed, the same math will show it.
Cash-out follows the same logic. Cash-out on short-term-rental collateral tops out around 70% LTV. Seasoning, the waiting period between purchase and refinance, is typically about six months in the wider network. The short-term-rental history expectation can be longer. Lendmire’s article Airbnb DSCR Operating History Requirements for Purchase vs Cash-Out lays out the differences.
For the full picture of how these loans work end to end, see Lendmire’s complete DSCR loans guide.
Common Calculation Mistakes
- Counting raw projected revenue as qualifying income.
- Forgetting HOA dues or flood insurance in PITIA.
- Mixing the lender formula with the investor formula in one calculation.
- Dividing an annual figure by a monthly payment.
- Treating a strong ADR as a strong ratio when occupancy is thin.
- Reading a 1.00 result as proof of positive cash flow.
- Assuming one lender’s income factor applies to all lenders.
Key Terms Defined
DSCR. The ratio of a property’s qualifying income to its monthly debt payment. A result of 1.00 means income equals the payment.
PITIA. Principal, interest, taxes, insurance, and association dues. It is the full monthly housing obligation on the property.
ADR. Average daily rate, the typical nightly price a rental earns when booked.
Income factor. The percentage reduction a lender applies to projected income before dividing by PITIA.
Seasoning. The waiting period a lender wants between buying a property and refinancing it.
Non-QM. A loan that sits outside standard owner-occupied mortgage rules, such as a DSCR loan on an investment property.
Frequently Asked Questions
Can I qualify for a DSCR loan on an Airbnb with no operating history?
Often yes, through programs that accept a market projection or an appraiser’s rent analysis for a purchase. The property qualifies primarily on property-level rental income covering the payment, subject to lender guidelines. Short-term-rental programs also typically look for a 640 credit score and about 12 months of landlord or host experience from the borrower. Each file is underwritten individually.
Is DSCR calculated on gross income or net operating income?
Lenders typically review a loan on qualifying income divided by PITIA, and many apply a reduction to the projection, subject to lender guidelines. Investors judging a deal often use net operating income divided by debt service. The lender version can help you gauge whether you may qualify, and the investor version can help you judge returns. They answer different questions.
What if the projection is lower than what I expect to earn?
The lender will generally use the projection it accepts, not your forecast. You can adjust by lowering the price, adding down payment within the program’s leverage cap, or choosing a different structure through select lenders. You can also test the property on long-term rent as a fallback.
Does DSCR count against my personal debt ratios?
DSCR lender review centers on the property’s income and the payment it carries. Credit and reserves still apply, so the file is not income-free. Programs differ on how personal debts are treated, which is worth raising with your broker up front.
Does clearing 1.00 mean the Airbnb will make money?
No. The ratio compares income to PITIA only. Repairs, vacancy, management, utilities, and capital expenses sit outside it. A property can clear the ratio and still lose money after those costs.
What Should You Do Next?
Run your own ratio before you make an offer. Use the conservative case first. Then ask a lender how it treats projected income, since that single answer shapes everything else.
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. You can reach the team at 828-256-2183 or request a quote through the Lendmire quote page.
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.
About Lendmire
Lendmire (NMLS# 2371349) is a mortgage broker arranging DSCR investor loans through select lenders in its wholesale network, across 41 markets including Washington, D.C. It does not lend or approve loans itself. All programs are subject to lender guidelines, credit approval, and property review, and nothing here is a commitment to lend. Scotsman Guide named Lendmire a Top Mortgage Workplace in both 2025 and 2026.
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References
1. Wikipedia – Debt service coverage ratio
2. AirDNA Help – Rentalizer Revenue Calculator
3. AirDNA Help – How does AirDNA calculate revenue
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: Buying an Airbnb With Cash vs. a DSCR Loan · How to Qualify for a DSCR Loan in Tennessee · How to Qualify for a DSCR Loan in California
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
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- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Disclosures. The information presented in this article is general market commentary, not financial, legal, or tax advice. Lendmire is a mortgage brokerage (NMLS# 2371349) — not a direct lender or depository institution — and loan placement is subject to lender underwriting. Nothing in this content represents a commitment to lend. Loan terms, pricing, and program availability vary based on borrower qualifications, property characteristics, and state of subject property, and are subject to change at any time. Lendmire complies with Equal Housing Opportunity requirements. Consumer access: nmlsconsumeraccess.org.