Loss Of Rent Calculator
Loss of rent is the income a rental property fails to produce: a unit sitting empty between tenants, or a tenant who has stopped paying. This calculator measures that loss three ways, by how long the unit was vacant, by the vacancy rate you underwrite, and by loss to lease, the quieter gap between market rent and the rent an occupied unit actually collects. It is about rent cheques that never arrive, not about what an asset is worth.
Quick Answer
- Loss of rent needs a unit that produced nothing. Loss to lease needs an occupied unit priced under market. This tool keeps the two in separate modes because they have different fixes.
- The daily figure is the one to watch during a vacancy: at $1,800 rent, every week on the market costs $420.
- Rent you never received is not a tax deduction. The expenses you paid while the unit sat empty usually are.
- Loss of rent insurance (fair rental value cover) pays after a covered event such as fire damage. It does not pay for an ordinary gap between tenants.
- Quick Answer
- How to use the loss of rent calculator
- The formulas for each mode
- Worked example: a $1,800 unit empty for six weeks
- Why the daily bleed rate changes behaviour
- Loss of rent insurance: what fair rental value cover actually pays
- What competing calculators miss
- Shorten the vacancy: five steps that protect the rent
- Frequently asked questions
- Add This Calculator to Your Website
How to use the loss of rent calculator
Pick the mode that matches your situation, confirm the pre-filled example, then press Calculate. Switching modes hides the previous result.
Vacancy duration is for a vacancy that already happened, or one you can measure in months: a turnover that took six weeks, a unit held off the market for repairs. Months accept decimals, so count partial months honestly instead of rounding a six-week gap down to one month and understating the loss by a third.
Vacancy rate is for planning and underwriting, when no single vacancy is being measured. It spreads an expected empty share of the year across every month and shows the effective rent you keep, which is the figure that belongs in a purchase model next to gross potential rent.
Loss to lease is for occupied units on old leases. If your actual rent turns out to be above market, the tool says so and reports the gain rather than forcing a loss: the headline total then shows the annual figure as a negative number, and the detail lines explain why.
The formulas for each mode
Three short formulas cover all three modes, and each one is printed in the results so the arithmetic can be checked at a glance.
Vacancy duration: rent × months × units
Total loss is monthly rent per unit times months vacant times the number of units affected. The tool adds two context figures: rent lost per day, which is monthly rent divided by 30 times units, and the loss as a share of annual rent potential, which is the total divided by rent times 12 times units. A tenant who stops paying fits this mode too: count the unpaid months the same way you count empty ones, and track what is owed separately in an accrued rent record for any claim.
Vacancy rate: rent × rate × units, times 12 for the year
Monthly vacancy loss is monthly rent times the vacancy rate times units. Multiply by 12 for the annual loss. Effective rent collected per unit is rent minus rent times the rate, and it is deliberately per unit: a 5% rate on a $1,800 unit leaves $1,710 a month whether you own one unit or forty.
Loss to lease: (market rent − actual rent) × units
The monthly gap is market rent minus actual rent, times units, times 12 for the annual figure. The percentage below market is measured against market rent. Sanity-check your market figure before blaming the lease: HUD publishes fair market rents by county, and our future rent calculator projects where a current rent is heading.
Worked example: a $1,800 unit empty for six weeks
One unit in a small block rents for $1,800. The outgoing tenant leaves at the end of March, the unit needs paint and a new hob, and the new tenant moves in mid-May: six weeks, entered as 1.5 months with 1 unit affected.
| Mode | Inputs | Headline total | Detail lines |
|---|---|---|---|
| Vacancy duration | $1,800 rent, 1.5 months, 1 unit | $2,700.00 | $60.00 per day; $21,600 annual potential; 12.5% eaten |
| Vacancy rate | $1,800 rent, 5% rate, 1 unit | $1,080.00 per year | $90.00 per month; effective rent $1,710; keeps 95.0% |
| Loss to lease | $2,000 market, $1,850 actual, 1 unit | $1,800.00 per year | $150 per month; 7.5% below market |
Read the headline totals with their modes attached. In duration mode the total is the whole loss for the period you entered. In rate and loss to lease modes the total is an annual figure, because those modes describe a running condition rather than one event. An earlier version of this article quoted the six-week vacancy as 6.25% of a $43,200 annual potential, which spread one empty unit across a two-unit building. The tool measures annual potential on the affected units only, giving 12.5%, and that is the figure this article uses: it matches what the calculator prints when you run it.
Why the daily bleed rate changes behaviour
A monthly rent figure feels abstract; a daily figure does not. At $1,800 a month the meter runs at $60.00 a day, so the six-week vacancy builds like this.
That framing settles arguments that monthly figures cannot. Paying a contractor an extra $300 to finish four days sooner is cheap at $60 a day. Dropping the asking rent by $50 a month to fill the unit two weeks sooner trades $600 a year for $840 saved once, which is worth it only if the lower rent does not reset the comparable for the next renewal. For day-level rent questions generally, such as part-month billing, the daily rent calculator prorates a month precisely instead of using this tool’s rent divided by 30 convention.
Loss of rent insurance: what fair rental value cover actually pays
Many landlord policies include loss of rent cover, often labelled fair rental value or loss of use. It pays the rent you lose when a covered event, typically fire, storm or burst-pipe damage, makes the property uninhabitable, usually for a stated period such as 12 months.
Two limits matter more than the headline. First, ordinary vacancy is not covered: a gap between tenants, a slow market or a tenant who simply stops paying are business risks, not insured events, and no claim will rescue them. Second, insurers pay on documented figures. Run the duration mode for the repair period, copy the results, and keep the tenancy agreement and the repair invoices with the claim: the summary line this tool produces, monthly rent times months times units with the daily rate, is exactly the schedule an adjuster asks for. If you are weighing the property as a purchase rather than insuring it, the buying a rental property calculator folds vacancy assumptions into the full deal numbers.
What competing calculators miss
The same-name rival tool runs one formula, monthly rent times months vacant, and stops. That is our duration mode without the daily rate and without the share of annual potential, so it cannot tell a landlord whether a vacancy is a nuisance or a tenth of the year’s income gone. Vacancy-only rivals do the rate mode instead, sometimes three near-identical pages of it, and none of them touches loss to lease, which for long-held portfolios is often the bigger number: a $150 monthly gap on every unit quietly outruns a single six-week vacancy within two years.
Guide-style pages from property managers make one fair point we agree with: the true cost of a vacancy includes turnover costs such as cleaning, repainting and advertising on top of the rent. We do not fold those into this tool, and the article says so rather than inflating the formula, because turnover costs vary too much to hard-code honestly. What we add instead is the comparison nobody else prints: the loss stated as a percentage of the affected units’ annual rent potential, plus the effective rent and effective gross income share in rate mode, so the result drops straight into an underwriting model.
Shorten the vacancy: five steps that protect the rent
The cheapest loss of rent is the week that never happens. These steps attack the gap between tenancies, which is where duration-mode losses come from.
- Price to the market before the unit empties. Check comparable listings while the outgoing tenant is still in place. A unit priced $100 over market that sits for three extra weeks loses more than the increase would have earned in a year.
- Start marketing during the notice period. Photograph the unit at the pre-move-out inspection and list it the same week, with viewings booked for the first days after handover.
- Turn the unit in days, not weeks. Book cleaners and trades before the keys come back, and pay the small premium for speed: at $60 a day on a $1,800 unit, four saved days cover a $240 rush fee.
- Renew good tenants early with a modest rise. A reliable tenant accepting a 2% rise beats a market-rate stranger after a five-week gap, every time. The loss to lease mode shows the gap you are accepting, in numbers, before you sign.
- Track days vacant per turnover. One number per unit per year exposes whether losses come from pricing, condition or slow response, and it feeds the vacancy rate you underwrite with.
Frequently asked questions
For a vacancy: monthly rent multiplied by months vacant multiplied by number of units. For a vacancy rate: monthly rent multiplied by the vacancy rate multiplied by units gives the monthly loss; multiply by 12 for the annual figure. For loss to lease: (market rent minus actual rent) multiplied by units gives the monthly gap, and multiplying by 12 gives the annual gap.
Many investors underwrite 5% to 10% vacancy, roughly 2 to 5 empty weeks per year per unit. Tight urban markets can run lower, while single-family rentals in soft markets often run higher. Use your own trailing 12-month history when you have it. The Census Bureau's Housing Vacancies and Homeownership survey publishes the national rental vacancy rate each quarter if you want an outside benchmark.
You generally cannot deduct rent you never received, because it was never income. But the expenses tied to the vacancy, like advertising, repairs, and utilities you paid while the unit was empty, are usually deductible rental expenses. Confirm with a tax professional. IRS Publication 527 sets out which rental expenses are deductible and how to report them.
Loss of rent is income lost because a unit produces nothing (vacant or non-paying tenant). Loss to lease is income lost because an occupied unit rents below the current market rate. This calculator measures both, in separate modes. The fixes differ too: loss of rent responds to faster turns and better pricing at listing, while loss to lease closes at renewal, one lease at a time.
Price to the market (not above it), respond to inquiries fast, keep turnover units rent-ready, renew good tenants early with modest increases, and track your days-vacant per turnover so the trend stays visible. The daily bleed figure from the duration mode tells you how much speed is worth paying for: on a $1,800 unit, every saved week is $420 back.
No. Loss of rent cover, usually called fair rental value or loss of use, pays when a covered event such as fire or storm damage makes the property uninhabitable, for the repair period and up to the policy limit. An ordinary vacancy between tenants, a soft market, or a tenant who stops paying is not a covered event. For a covered claim, insurers expect documentation, and the duration mode of this calculator produces the rent times months calculation they ask for.
Because the headline total in that mode is the annual gap, and the gap is negative when your tenants pay above market rent. The detail lines spell it out: no loss, the units earn a stated amount per month above market, and an annual gain figure. A negative total there is good news recorded honestly, not an error. At exactly market rent the tool reports no loss to lease and a total of $0.00.
Months vacant accepts decimals, so enter six weeks as 1.5 rather than rounding. The daily rate uses a 30-day month convention (monthly rent divided by 30), which is the convention the old landlord guides use and keeps the daily figure consistent with the monthly one. Unit counts are read as whole numbers: entering 2.9 units is treated as 2, and a count under 1 is rejected with an error.
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References
- U.S. Census Bureau, Housing Vacancies and Homeownership (HVS). Housing Vacancies and Homeownership (U.S. Census Bureau). Accessed October 22, 2026.
- U.S. Department of Housing and Urban Development, HUD User, Fair Market Rents dataset. Fair Market Rents (HUD User). Accessed October 22, 2026.
- Internal Revenue Service, Publication 527, Residential Rental Property (Including Rental of Vacation Homes). Publication 527, Residential Rental Property (IRS). Accessed October 22, 2026.
- Internal Revenue Service, Tax Topic No. 414, Rental Income and Expenses. Tax Topic 414, Rental Income and Expenses (IRS). Accessed October 22, 2026.
- U.S. Bureau of Labor Statistics, Consumer Price Index, Rent of Primary Residence. CPI Rent of Primary Residence factsheet (BLS). Accessed October 22, 2026.
- Joint Center for Housing Studies of Harvard University, The State of the Nation’s Housing (rental market and vacancy analysis). The State of the Nation’s Housing (Harvard JCHS). Accessed October 22, 2026.
- U.S. Census Bureau, Housing Vacancies and Homeownership (HVS), Concepts and Definitions (rental vacancy rate definition and formula). HVS Concepts and Definitions (U.S. Census Bureau). Accessed October 22, 2026.
- Internal Revenue Service, Rental Income and Expenses (real estate tax tips: what counts as rental income, and which rental expenses are deductible). Rental Income and Expenses (IRS). Accessed October 22, 2026.
- U.S. Department of Housing and Urban Development, HUD User, FY 2026 Fair Market Rent Documentation System (how each area FMR is calculated). FY 2026 FMR Documentation System (HUD User). Accessed October 22, 2026.
- National Association of Insurance Commissioners (NAIC). A Consumer’s Guide to Home Insurance (including Loss of Use coverage). Accessed October 22, 2026.