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Short-term cash flow uses the same leftover-after-costs identity as a 12-month lease. The income line is nights and fees, not a monthly rent roll. Official HUD and Census housing series do not become occupancy or nightly rate just because the property could be listed on a platform.
By RentalAnalytics Editorial Team · Published September 14, 2026
The identity is not different. Cash flow is what remains after you collect income, pay to operate the property, and pay the lender. The long-term cash flow walkthrough uses scheduled monthly rent minus vacancy. An STR model replaces that scheduled rent with nights booked times the nightly rate you actually keep after platform fees.
The expense list is longer. Cleaning, linens, supplies, utilities, and furniture wear show up every turnover. A long-term model can bury some of those costs in a single maintenance line. An STR model that hides them will look stronger than the same building on a 12-month lease, for no operating reason.
Because they measure something else. HUD's 50th-percentile series is a median gross rent by FMR area, and HUD states those figures are not Fair Market Rents.[1] Fair Market Rent is the 40th-percentile voucher schedule.[2] Census ACS table B25031 is median gross rent by bedrooms at the ZCTA, an occupied-unit median with a margin of error, not asking rent and not a nightly rate.[3]
The Census Housing Vacancy Survey put the national rental vacancy rate at 7.3% in the second quarter of 2026. The Bureau wrote that "National vacancy rates in the second quarter 2026 were 7.3 percent for rental housing and 1.2 percent for homeowner housing."[4] That survey counts housing units. It does not count booked nights on a short-term platform, and it does not become an occupancy assumption if you multiply (1 minus 7.3%) by 365.
Use those series as a long-term fallback. If the STR case needs $4,000 a month in net guest income to clear the loan, ask what the same unit would rent for on a 12-month lease using HUD 50th plus ACS and comps. That comparison is the stress test. Inventing a 70% occupancy or a market ADR is not.
Freddie Mac's 30-year fixed average was 6.76% as of September 10, 2026.[5] Use a written quote for the loan you will actually close. Many STR properties do not price like a conventional owner-occupied purchase. Do not paste the survey print in as if it were an STR product rate.
The ones that scale with stays. Turnover cleaning and laundry. Consumables. Higher utilities if you pay them year-round. Furniture and appliance replacement on a shorter cycle than a long-term rental. Channel or property-manager fees. Local occupancy or lodging taxes if you, not the platform, remit them.
Ordinary landlord costs still apply. Census and HUD's Rental Housing Finance Survey found mean total operating expenses of $6,194 per year for one-unit rentals in 2020.[6] That vintage figure is a long-term one-unit sanity check, not an STR budget. An STR sheet that comes in under that total while also paying cleaners and utilities is missing lines, not proving efficiency.
Insurance and regulation are local. This article does not invent a typical STR premium or a typical occupancy tax. Read the ordinance and the policy. The vacancy panel is a long-term housing view. It is not an STR heatmap.
Reporting questions, not cash-flow questions. IRS Topic 415 states there is a special rule if you use a dwelling unit as a residence and rent it for fewer than 15 days: do not report any of the rental income and do not deduct any expenses as rental expenses.[7] Publication 527 repeats that rule and covers mixed personal and rental use, including allocation by days.[8]
Publication 527 also distinguishes residential rental property from an establishment where more than half of the units are used on a transient basis. That line is about depreciation class, not about whether your listing is a good deal. A CPA should classify the activity. Do not turn a cash-flow model into a filing position.
The cash flow analyzer will take monthly income and expense inputs you provide. For an STR, convert nights and fees to a monthly equivalent first, then run a second case with HUD 50th plus ACS long-term rent. The tool does not estimate occupancy and does not claim STR accuracy. This article is education on how to keep those layers straight.
Use the same identity as a long-term rental: effective income minus operating expenses minus debt service. Build income from booked nights after platform fees, then add cleaning, utilities, supplies, and furniture. Do not paste a HUD or Census housing figure in as occupancy.
No. The Census Housing Vacancy Survey measures vacant housing units, not nights booked on a listing platform. The Q2 2026 national rental vacancy rate was 7.3 percent. That is useful long-term context, not an STR occupancy rate.
No. FMR is a 40th-percentile voucher schedule for long-term gross rent. HUD 50th-percentile rents and Census ACS are long-term occupied-unit medians. Use them as a fallback long-term case, not as nightly rate times 365.
Not always. IRS Topic 415 and Publication 527 treat a dwelling used as a residence and rented fewer than 15 days as a special case: do not report that rent, and do not deduct those rental expenses. Mixed personal use has allocation rules. Confirm classification with a CPA.
Platform or manager fees, turnover cleaning, linens and supplies, utilities the guest does not pay, and furniture replacement. Those lines sit on top of taxes, insurance, and maintenance. Skipping them is how an STR model looks stronger than a long-term model that used the same building.
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