How Lenders Calculate Short-Term Rental Income
You ran your own numbers and underwrote the property at $64,496 a year. Under the methods illustrated below, your lender may qualify it on about $27,000 or $32,000 a year, or on nothing at all. The income a lender counts is rarely the income you projected, and the method it uses decides whether the loan closes. Here's how each type of lender actually arrives at its number.
Matt NunnFounder, Builders Finance12 min readOn this page4 sections
Key takeaways
- The revenue you underwrite and the income a lender uses to qualify are two different numbers — and the gap between them is where financing surprises happen.
- Conventional (agency) loans, the ones written to Fannie Mae's or Freddie Mac's rules, count short-term-rental income only narrowly. As of October 2026, Fannie Mae's Selling Guide (B3-3.8-03, dated 09/02/2026) allows it on a one-unit investment property legally permitted to operate as an STR. It cuts the gross figure to 50% (or uses your tax-return cash flow on a refinance), and a positive result can only offset that property's own payment — it never adds to your qualifying income. Otherwise the agency path uses 75% of the appraiser's long-term market rent.
- A lender may instead treat STR income as business income under separate rules — but that's the lender's classification choice, not something you can assume.
- Non-agency DSCR lenders can use short-term income. DSCR stands for debt service coverage ratio: the rent the lender counts, divided by the property's full monthly payment. These lenders work out that income in several ways — commonly a 12-month operating history, a third-party projection like AirDNA (often discounted), or a fallback to long-term market rent — and frequently take the most conservative figure the evidence supports.
- The one move that prevents a blown pre-approval: ask each lender how they'll derive and document your STR income before you assume your projection counts.
The number you project is not the number they qualify
Every STR owner underwrites a revenue figure. Every lender derives its own. Those two numbers are rarely the same, and the loan is decided on the lender's — not yours. Understanding how each lender builds that figure is the difference between a smooth closing and a pre-approval that falls apart in underwriting (the lender's full review of your file).
Take the example deal these guides use, an illustration rather than a forecast, whose full assumption set is listed in The Assumptions Behind Every Model. Its stabilized annual revenue is about $64,496, approximately $5,375 per month in gross revenue. (The first year runs lower while the listing ramps up.) That's the revenue figure you carry into your own deal analysis: an input to the buy decision, not the decision itself.
But when you go to finance, the lender doesn't inherit your spreadsheet. It runs the property through its own method for deriving income. Depending on the loan type, that method might land at your $5,375, at a long-term-rent figure less than half of it, or at a number that can't be used to qualify at all. This guide walks through the two places where that happens: the agency (conventional) path, and the non-agency DSCR path.
The agency path: a narrow door for STR income
On a conventional, agency-backed loan, short-term-rental income gets through only a narrow door — and whatever gets through can offset the property's own payment, never add to your income. For a lot of STR buyers, that one feature of the rules still decides the whole financing approach.
Here's how it works, as of October 2026. Fannie Mae's Selling Guide now has a short-term-rental rule of its own (B3-3.8-03, added September 2, 2026, and required for applications dated on or after December 1, 2026). It applies only to a one-unit investment property that is legally permitted to operate as a short-term rental, and not to income from an accessory unit. How the income is established depends on the transaction.
On a purchase, the gross monthly figure comes from one of two places. One is the appraiser's rent schedule (Form 1007, completed on long-term rentals). The other is validated data for comparable short-term rentals: MLS or property-management records, averaging the comparables' rates and multiplying by the average days rented. The lender takes 50% of that figure as net rental income; the other half is treated as vacancy and maintenance.
On a refinance of a property already on your tax return, the lender instead runs a cash-flow analysis of your Schedule E (the tax-return schedule for rental income), averaged over 12 months.
Either way, the result is set against the property's full PITIA: principal, interest, taxes, insurance and any homeowners-association dues. A positive figure can only offset that payment, and a negative one is added to your debt-to-income ratio (DTI). You also need a current housing payment of your own to use any of it.
The ordinary long-term rule still exists alongside it (B3-3.8-02). When rental income is used to qualify and there's no lease to transfer, the figure comes from the appraiser's Form 1007 (single unit) or Form 1025 (2–4 units). Freddie Mac's equivalents are Form 1000 and Form 72. The form gives an estimate of long-term monthly market rent, and the lender takes 75% of it. Fannie's own appraiser guidance says Form 1007 "was not designed" for short-term rentals, which is why the separate short-term rule exists. The Selling Guide does not say whether a lender may use this long-term method for a property that will operate as a short-term rental; ask the lender which rule it will apply.
On the example deal, neither route sees $64,496. On the long-term route, a lender sees a four-bedroom house that might lease for ~$3,000 a month and takes 75% of it ($2,250). That's short of the ~$4,002 payment, so the lender adds the shortfall to your DTI as a liability. On the short-term route, even if comparable short-term rentals supported your full ~$5,375 a month, 50% of it is ~$2,687. That's still short of the payment, so a shortfall still lands in your DTI. The $64,496 you underwrote never enters the calculation as income.
There is one other route, and it's a lender's choice rather than yours. Fannie Mae's June 2024 Appraiser Update says a lender may elect to treat STR income as business income instead of rental income (the September 2026 short-term-rental topic, B3-3.8-03, does not address this election) — in which case the Selling Guide's business-income rules apply and no Form 1007 is needed. That's a real alternative pathway, but it depends entirely on how a given lender decides to classify the income. It also comes with the documentation burden of business income (tax returns, a track record). You can't assume it; you have to ask for it.
One more limit catches new buyers on the long-term route. With less than 12 months of rental-management experience, the property's rent can only offset its own payment, not add to your qualifying income (B3-3.8-02). And on either route, you need a current housing payment of your own to use the property's rental income at all. So on the agency path, a first-time STR buyer often can't lean on rental income, no matter how strong the projection.
The DSCR path: a few common ways to the same box
Non-agency DSCR lenders can qualify on short-term income — but "qualifying STR income" isn't one defined number. Lenders derive it in several ways, and many take the most conservative supported figure. This is the crux of the whole guide: getting a DSCR loan approved on your STR revenue depends less on your projection than on which method the lender uses to test it.
Three common methods you'll encounter:
A 12-month operating history. If the property already runs as an STR, the lender can use its documented trailing income (what it actually earned over that recent stretch), shown in platform payout statements, property-management reports, or bank deposits. A documented operating history can give a lender stronger income evidence than a projection alone, which is why an STR with a track record is often easier to finance than a fresh one.
A third-party projection. For a property without a track record, some lenders accept a market-data estimate from a service like AirDNA or Rabbu — but they commonly apply a haircut (a discount that varies by lender) before it counts, precisely because a projection isn't a receipt.
A fallback to long-term market rent. When there's no history and the lender won't lean on a projection, it can revert to the appraiser's long-term rent — the same figure the agency path would use. On a property whose numbers only work as a nightly rental, that fallback can quietly drag the DSCR too low to qualify.
Because the method is lender-specific, the same property produces different qualifying income at different DSCR lenders. Some programs qualify on the lesser of in-place or market rent ÷ PITIA (in-place rent is what the property actually collects now) and accept 12-month STR ledgers. Others weight AirDNA differently or require more history. None of them simply adopt your underwritten pro-forma, the projection you built for your own analysis. Present your evidence, but confirm the method.
What to bring, by method
Because the method drives the number, the way to protect a deal is to walk in with the evidence each method needs — and to ask which one the lender will apply. The stronger your documentation, the less a lender has to fall back to the conservative option.
If the property has a history, gather the trailing 12 months of platform payout statements, any property-management income reports, and the bank deposits that back them up. Actual receipts beat any projection.
If it's a fresh purchase, have a clean third-party market report ready. Ask the lender directly whether they'll use it, how they'll haircut it, and whether they'd otherwise revert to long-term rent.
On the agency side, if a lender is open to treating the income as business income, be ready for the business-income documentation (returns, a track record) that path requires.
In every case, the question to ask out loud, before you're under contract, is simply: how will you derive and document the income on this property?
Your revenue is not the lender's income.
The figure you underwrite to decide whether to buy is not the figure a lender uses to decide whether to lend. Each lender derives qualifying income its own way — long-term rent, actual history, a discounted projection — so treat your pro-forma as your decision tool, and confirm the lender's method before you count on the loan.
The mistake is getting pre-approved on your own revenue number and assuming the loan is set. A pre-approval built on your pro-forma can collapse at underwriting when the lender's method produces a lower qualifying income: a haircut projection, or a long-term-rent fallback that turns a comfortable file into a decline. The number that matters was never yours. Confirm the lender's derivation method before you remove your financing contingency, the clause that lets you exit the purchase contract if your financing falls through.
Your action plan
- Separate your two numbers. Keep your realistic underwritten revenue for the buy decision, and don't assume it's the lender's qualifying income.
- Ask the method first. Before anything else, ask each lender exactly how they'll derive STR income — long-term rent from the appraiser's Form 1007, Fannie Mae's short-term-rental method, a 12-month history, or a third-party projection — and how they'll document it.
- Lead with actuals when you have them. A trailing 12-month history (payouts, reports from your property-management software, deposits) is the strongest evidence and the least likely to be discounted.
- Pin down the haircut. If a lender uses AirDNA or similar, ask what discount they apply and whether they'd fall back to long-term rent without it.
- On agency, ask about business-income treatment. Whether to classify the income that way is the lender's choice. If it's available, prepare the business-income documentation it requires.
- Underwrite the fallback. Check whether the deal still qualifies if the lender reverts to long-term market rent. If it doesn't, you're relying on a method the lender may not use.
The bottom line
The revenue you project and the income a lender qualifies on are two different numbers, and financing gets decided on theirs. The agency path counts your nightly revenue only narrowly: half of it, on a legally permitted one-unit investment property, and only to offset that property's own payment, with 75% of long-term rent as the ordinary alternative. A DSCR lender can use short-term income but derives it in one of several common ways, often the most conservative. None of them simply adopt your pro-forma. So keep your underwrite for the decision it's built for, and treat the financing as a separate question with its own arithmetic: ask how the lender derives the income, bring the evidence that keeps them off the conservative fallback, and never assume your number is theirs.
Educational information only — not individualized tax, legal, or investment advice. The worked example is an illustrative model, not a projection or a recommendation.
