The Quick Read: The formula is the same as for any rental: the income the lender accepts, divided by the full monthly payment on the property. For an Airbnb, the hard part is the top number, because no signed lease exists to point to. The lender picks an income figure from booking history, a market projection, or an appraiser’s rent schedule.
- Formula: qualifying monthly income ÷ PITIA (principal, interest, taxes, insurance, and association dues).
- Income paths: about 12 months of host history, a third-party projection, or the appraiser’s long-term rent estimate.
- Short-term rental floor: a 1.00 coverage floor on both purchases and refinances, subject to lender guidelines.
- Leverage: up to 75% LTV on a short-term rental purchase, and up to 70% on a refinance or cash-out.
- Catch: clearing 1.00 does not mean the property makes money.
Key Terms Defined
DSCR (debt service coverage ratio): a number showing whether a property’s income covers its monthly housing payment.
PITIA: principal, interest, taxes, insurance, and association dues. It is the full monthly payment the property carries.
Qualifying income: the rental income figure the lender agrees to count. It can differ from what you actually earn.
TTM (trailing twelve months): the most recent 12 months of income, taken from platform payouts or bank deposits.
Market-rent appraisal (Form 1007 or 1025): an appraiser’s estimate of long-term monthly rent. Form 1007 covers single-family homes. Form 1025 covers two-to-four-unit properties.
LTV (loan-to-value): the loan balance as a percentage of the property’s value.
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 Goes Into the DSCR Formula on an Airbnb?
The formula is one division. Qualifying monthly income goes on top. PITIA goes on the bottom. Annual or monthly figures give the same ratio, as long as both sides use the same period.
The denominator is the full housing payment. That means principal and interest, property taxes, insurance, and any HOA or association dues. Flood insurance is added where it applies. Forget the dues, and your ratio looks better than the lender’s will.
This is simpler than the corporate version. In general finance, the ratio is net operating income divided by total debt service, with a result above 1.0 meaning income covers the debt and below 1.0 meaning a shortfall. Residential DSCR files use a simplified version built on the rental income the lender accepts. That is why the numerator becomes the whole conversation for a short-term rental.
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. The loan is reviewed primarily on property-level rental income covering the payment, subject to lender guidelines. Your personal debt-to-income ratio is not the test.
Which Income Number Does the Lender Use?
It depends on what evidence the property has. Across the wholesale network Lendmire works with, three paths come up again and again. The lender chooses one, and the choice can move the ratio a lot.
| Path | When it applies | Evidence | Main risk |
|---|---|---|---|
| Booking history (TTM) | Property already operating | Payout reports, bank deposits | Lean months drag the average |
| Market projection | No history, or a conversion | Third-party property report | Fewer comps, weaker estimate |
| Appraiser rent | Fallback path | Form 1007 or 1025 | Can sit far below real STR revenue |
Booking history. This is usually the first thing lenders look for. You show 12 months of platform payouts or deposits. Short-term rental programs commonly expect about 12 months of host experience, so a strong track record helps the file in more than one way.
Projection. A projection comes from a data vendor that models the property on similar nearby listings. One such tool, Rentalizer by AirDNA, draws on a large database of listings, so the estimate is only as good as the comps it picks. Fewer comparable listings means a weaker estimate. Not every lender accepts projections, so ask before you order a report or an appraisal.
Appraiser rent. A lender that won’t underwrite short-term income falls back on the long-term rent schedule. That number reflects a year-long tenant, not nightly bookings. In a strong vacation market it can come in well below actual revenue.
Which path the lender uses can matter more than the property itself. The same house can look very different under each method.
How Do You Calculate It Step by Step?
Five steps get you there. Do them in this order and the ratio is hard to botch.
1. Pick the accepted annual income. Use trailing-12-month revenue, a projection, or appraiser rent, whichever the lender will take.
2. Apply the lender’s adjustment. Many lenders count only part of gross short-term revenue, because operating costs run heavier than on a long-term rental. The adjustment is the lender’s choice. It varies, so ask for it in writing.
3. Convert to monthly. Divide the annual figure by 12.
4. Total PITIA. Add principal, interest, taxes, insurance, and association dues.
5. Divide and compare. Qualifying monthly income divided by PITIA gives the ratio. Then check it against the program floor.
Here is the logic with round, hypothetical ratios rather than dollars. If the accepted income is twice the payment, coverage is 2.00. If it equals the payment, coverage is 1.00. If it falls short of the payment, coverage is below 1.00.
One Property, Three Income Paths
Say you are looking at a beach-town duplex. Hold the payment constant and change only the income method. These are modeled assumptions, not market data.
| Income path | Modeled result |
|---|---|
| Booking history, averaged over 12 months | Around 1.25x |
| Market projection with lender adjustment | Around 1.10x |
| Appraiser long-term rent | Around 0.85x |
Same property. Same payment. Three answers. Under the first two, the file clears the 1.00 floor that short-term rental programs start from. Under the third, it falls short. A coverage ratio below 1.00 is a different path: it is available through select lenders in the network, with leverage and terms adjusted. It is not the same program with a lower floor.
Before you buy, run the property both ways, as a short-term rental and as a long-term rental. If both clear, you have room. If only the short-term version clears, you are relying on one income method, and you should know that going in.
Does Seasonality Change the Calculation?
Lenders look for a sustainable average, not your best month. A beach house might earn heavily in summer and barely cover utilities in winter. The trailing-12-month method smooths that out by design. Projections do the same by modeling a full year.
Run your own lean-month check anyway. Take your slowest stretch and ask whether you can carry the property through it without help. The ratio won’t tell you.
Here is the point many first-time investors miss. DSCR compares rent to PITIA only. Cleaning, management fees, platform fees, utilities, supplies, repairs, vacancy, and capital expenses sit outside it. A property can clear 1.00 and still lose money each month. Treat the lender’s ratio as a qualification test, and build your own net cash flow analysis next to it.
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 Changes the Payment Side?
The denominator moves more than most people expect. A few things shift it.
- Taxes and insurance. Both can reset after a purchase, which raises PITIA and lowers coverage.
- Association dues. They count in full.
- Loan structure. The spine of the network is the 30-year fixed. Interest-only periods and extended terms are available through select lenders, and they lower the payment the ratio is measured against. ARM structures exist for investors who want them.
- Loan size. Standard programs run up to $3,000,000, and above $2,500,000 the network generally holds to 30-year fixed structures.
A larger down payment also lowers the payment and can lift the ratio. It never erases the other tests, though. Leverage caps, credit floors, reserve rules, and property eligibility all still apply. The strongest files clear both: enough equity and enough rental coverage.
What If Your Ratio Comes Up Short?
You have more levers than you think. Try them in this order.
1. Change the income path. If the appraiser’s rent is the problem, ask whether booking history or a projection is accepted.
2. Clean up the documentation. Organized payout reports and consistent deposits make the history easier to count.
3. Put more down. Lower leverage lowers the payment. Short-term rental purchases top out at 75% LTV, so you can go lower, never higher.
4. Adjust the structure. An interest-only period, where available through select lenders, lowers the monthly obligation.
5. Look at the sub-1.00 path. It is available through select lenders in the network, with leverage and terms adjusted. Final terms depend on lender guidelines, property type, leverage, and the borrower’s complete credit picture.
Each of these has a tradeoff. More cash down means less cash for the next deal. Interest-only means slower balance paydown. Weigh both sides.
Common Calculation Mistakes
- Using gross nightly revenue with no adjustment. Lenders usually discount it.
- Forgetting association dues. They belong in PITIA.
- Counting peak months. Lenders average the year.
- Treating the ratio as profit. It is a coverage test, not a return.
- Assuming one projection is gospel. It is a modeled estimate from comps, so inspect the comp set.
- Ignoring local rules. 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.
How This Differs From a Conventional Loan
Conventional lenders tend to discount short-term rental income and count the loan against your personal debt-to-income ratio. AvantStay’s comparison makes the same contrast: conventional underwriting haircuts the income, while DSCR programs can use fuller short-term projections. That is the main reason investors who are scaling lean toward DSCR, since the loan is judged on the property rather than on your traditional personal-income documentation. The complete DSCR loans guide walks through the full comparison.
If you are weighing a specific property type, Lendmire’s piece How Short-Term Rental Loans Work for Vacation Home Owners Going Full Airbnb covers that situation in more detail.
Program eligibility matters too. Short-term rental purchases generally need a 640+ score, and refinances sit at up to 70% LTV. Manufactured homes, log homes, and barndominiums are not offered in these programs. All of this is subject to lender guidelines and individual underwriting, and none of it is a commitment to lend.
Frequently Asked Questions
Can I use Airbnb income with no operating history?
Sometimes. A first-time short-term rental or a long-term-rental conversion falls back on a market projection or the appraiser’s rent schedule. Only some lenders accept projections, so ask before you spend money on reports. Short-term programs commonly expect about 12 months of host experience, which can affect which options are open.
Does the lender use gross or net income?
Residential DSCR uses the income the lender accepts, not your net profit after expenses. Many lenders count only part of gross short-term revenue, because operating costs are heavier than on a long-term rental. Your actual expenses sit outside the ratio, which is why you should run your own cash flow numbers.
Is a ratio under 1.00 an automatic no?
No. A 1.00 floor is where short-term rental programs start. A separate path below 1.00 is available through select lenders in the network, with leverage and terms adjusted. Expect lower leverage or different terms, and approval stays subject to credit review and property eligibility.
Do LLC-held or self-employed hosts calculate DSCR differently?
The math is the same. The loan is reviewed on the property’s income rather than your traditional personal-income documentation, so write-offs on a personal return don’t shrink the number. LLC borrowers are accepted subject to lender program eligibility.
Is the DSCR the same as my debt-to-income ratio?
No. DSCR looks at the property’s income against its payment. Debt-to-income looks at your personal income against all your personal debts. That difference is why a DSCR file can move forward even when a conventional one stalls.
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. Tax treatment varies; consult a qualified professional.
Investors focused on short-term rentals can review DSCR loans for Airbnb and short-term rentals.
About Lendmire
Lendmire — NMLS# 2371349 — is a mortgage brokerage specializing in DSCR investor loans, helping arrange financing across 41 markets, including Washington, D.C., through wholesale and investor-lending channels. The model centers on property-level rental income reviewed by the lender rather than W-2 documentation, subject to lender guidelines, suiting entity-owned and multi-property investors. Lendmire holds Scotsman Guide Top Mortgage Workplace recognition for 2025 and 2026.
Get Started
Ready to find the right loan for you?
In about 30 seconds you can review financing options available for your investment property. No commitment required.
Informational only. Not a Loan Estimate, approval, or commitment to lend. Program availability and eligibility are subject to lender guidelines, credit approval, property review, and underwriting.
References
1. Wikipedia – Debt service coverage ratio
2. AvantStay – Finance Airbnb with Projected Income
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 Lake Tahoe Luxury Rental DSCR Loan Works · How to Get a Cash-Out Refinance on a Former Airbnb With DSCR · Does a DSCR Lender Use IO or Amortizing Payments on a 2-4 Unit Rental?
Brandon Miller
Founder & CEO, Mortgage Loan Originator, Lendmire LLC
- Mortgage Loan Originator · NMLS# 1129696 · Verify on NMLS Consumer Access
- North Carolina Real Estate Broker · License# 343312 · Verify on NCREC
- North Carolina Insurance Producer · License# 19053198 · Property, Casualty, Life, Health · Verify on NAIC SBS
- Lendmire LLC · Firm NMLS# 2371349 · Verify firm licensure
Legal disclosures. Lendmire (NMLS# 2371349) is a state-licensed mortgage brokerage that arranges financing through wholesale lender relationships. Lendmire is not a direct lender, depository institution, or registered financial advisor. The discussion above is general informational content about real estate financing — it is not financial, legal, or tax advice, and readers should consult licensed professionals for guidance on their individual circumstances. Loan inquiries are subject to lender underwriting; this article does not represent a commitment to lend. Loan terms, rates, and qualification standards vary by borrower, property, and state, and are subject to change at any time. Equal Housing Opportunity. NMLS Consumer Access: nmlsconsumeraccess.org.