The decision this calculator supports
The Break-Even Rent and Occupancy Calculator answers two inverse questions from one monthly rental scenario:
- What scheduled monthly rent is required at the entered collected-occupancy rate?
- What collected-occupancy rate is required at the entered scheduled rent?
Methodology review: July 19, 2026 · Calculator formula version rental-break-even@1.0.0
Both answers cover the same modeled monthly operating expenses, direct debt service, fixed other income, and optional user-entered cash-flow target. Switching modes changes which answer and sensitivity test receive emphasis; it does not change the underlying math.
These are requirement estimates, not market predictions. The calculator does not decide what rent is achievable, what occupancy is likely, whether a rent change is lawful, or whether a property or borrower qualifies for financing.
Keep every input in one monthly period
Use monthly USD for:
- Scheduled rent before vacancy or collection loss
- Fixed other income
- Recurring operating expenses and intended reserves
- Direct debt service
- Target cash flow
Collected occupancy is entered as a percentage. In this model it combines the share of scheduled rent expected to be collected after vacancy, turnover, concessions, and collection loss:
Modeled rental collection = scheduled monthly rent × collected occupancy
This is a scenario assumption, not a physical-occupancy forecast. Two properties with the same occupied-unit percentage can collect different shares of scheduled rent.
The Office of the Comptroller of the Currency’s Commercial Real Estate Lending handbook explains why income analysis may start with fully leased income and then apply vacancy assumptions, while expense and reserve conventions can vary. DealYield keeps the entered assumption visible instead of supplying a market benchmark.
Calculate the monthly requirement first
The calculator first combines operating expenses and debt service:
Monthly costs = operating expenses + debt service
It then accounts for the cash-flow target and fixed other income:
Required rental collection = max($0, monthly costs + target cash flow − other income)
The floor at zero matters. If fixed other income already covers monthly costs and the target, the property does not need a negative rent or negative occupancy rate. Both rental requirements become zero and the result includes an explanatory state.
Other income is treated as a fixed collected monthly amount. If parking, laundry, reimbursements, or another source varies with occupancy, normalize that amount before entering it. Version 1 does not apply the occupancy rate to other income automatically.
Solve for required scheduled rent
Rent mode uses:
Required scheduled rent = required rental collection ÷ collected occupancy
The representative scenario has:
- Monthly operating expenses: $986.00
- Monthly debt service: $1,422.15
- Fixed other income: $100.00
- Target monthly cash flow: $250.00
- Collected occupancy: 95%
Monthly costs are $2,408.15 and required rental collection is:
$2,408.15 + $250.00 − $100.00 = $2,558.15
Required scheduled rent is:
$2,558.15 ÷ 95% = $2,692.79
At the entered $2,700 scheduled rent, the rent margin is $7.21.
That margin is only the difference between entered and required scheduled rent. It is not evidence that the rent is attainable, permitted, competitive, or adequately conservative.
Solve for required occupancy
Occupancy mode reverses the same requirement:
Required occupancy = required rental collection ÷ scheduled monthly rent
Using the same example:
$2,558.15 ÷ $2,700 = 94.7463%
The entered 95% assumption is about 0.2537 percentage points above the required rate.
If required occupancy exceeds 100%, DealYield preserves the result and flags it. The result is mathematically useful because it shows how far the current scheduled rent falls short, but it is operationally impossible at that rent.
Compare modeled cash flow with the target
The forward cash-flow calculation is:
Modeled cash flow = (scheduled rent × occupancy) + other income − monthly costs
For the representative scenario:
($2,700 × 95%) + $100 − $2,408.15 = $256.85
The target margin is:
$256.85 − $250 = $6.85
DealYield labels the scenario above, at, or below the target. A difference that rounds to $0.00 at displayed cent precision is treated deterministically as meeting the target so the status does not contradict the displayed amount.
The target is selected by the user. DealYield does not recommend a minimum monthly surplus or turn the target into an approval rule.
Cash-flow break-even versus NOI break-even
Version 1 is a cash-flow break-even calculator because monthly debt service is included in costs.
Property-level NOI normally excludes principal and interest:
NOI = effective property income − operating expenses
Cash flow after financing then subtracts debt service:
Pre-tax cash flow = NOI − debt service
The OCC handbook describes NOI as property income less operating expenses and excludes principal and interest from operating expenses. That separation is why DealYield asks for debt service as its own input.
Set debt service to $0 to inspect an operating-only requirement, subject to the entered other income and target. Use the NOI Calculator when you need to audit scheduled income, vacancy and credit loss, itemized expenses, replacement reserves, and NOI directly.
Debt service is deliberately entered directly
This calculator does not request loan principal, interest rate, amortization, loan term, interest-only period, or balloon date. Those assumptions can produce different payment phases and maturity balances even when the property assumptions stay the same.
Enter the monthly debt-service amount appropriate to the decision you are testing. Use the Mortgage Payment Calculator to estimate principal and interest, interest-only transitions, recurring property costs, fees, and balances. Do not add operating expenses twice if a payment estimate includes taxes, insurance, or association charges.
Lenders may define debt service, reserves, stressed payments, and underwriting periods differently. This calculator does not qualify a borrower, approve a loan, or determine a lender’s required payment.
Zero and impossible states
The calculator handles boundary cases explicitly:
- A negative money amount or occupancy outside 0–100% is invalid.
- If other income covers monthly costs and the target, required rent and occupancy are $0 and 0%.
- If positive rental collection is required at 0% occupancy, required rent is unavailable. No finite scheduled rent can create collected rent when the multiplier is zero.
- If positive rental collection is required at $0 scheduled rent, required occupancy is unavailable.
- Required occupancy above 100% is shown and flagged as impossible at the entered rent.
- A 100% occupancy assumption is valid but receives a warning because it has no vacancy or collection allowance.
- $0 operating expenses are valid but receive a warning to check for omitted costs or reserves.
- Extremely large finite inputs that cannot produce finite displayed results pause the calculation rather than showing infinity or
NaN.
The focused calculator intentionally treats a zero rental requirement as zero even when rent or occupancy is also zero. The broader Rental ROI calculator retains its released rental-roi@1.1.0 zero-denominator behavior for historical results.
Use sensitivity as an assumption test
Rent mode shifts collected occupancy by 5 and 10 percentage points and reruns the same engine. This shows how lower collection raises required scheduled rent.
Occupancy mode shifts scheduled rent by 5% and 10%. This shows how lower scheduled rent raises required occupancy.
Scenarios are clamped to valid boundaries and identical boundary rows are removed. The sensitivity table is not a probability distribution, market forecast, or recommendation. It makes the arithmetic response to changed assumptions visible.
What this calculator excludes
Version 1 does not model:
- Market rent, comparable leases, tenant demand, or future rent growth
- Local rent controls, notice rules, lease terms, or tenant protections
- Unit-by-unit rent rolls or different lease expirations
- Variable operating expenses that automatically change with occupancy
- Delinquency timing, concessions, bad-debt recovery, or security deposits
- Income taxes, depreciation, appreciation, sale proceeds, or refinancing
- Loan approval, borrower credit, reserves, guarantees, or lender product rules
- A recommended rent, occupancy, cash-flow target, or safety margin
Use the Rental Property ROI Calculator for the broader acquisition, financing, NOI, cap-rate, cash-on-cash, and rent-sensitivity view. The focused break-even calculator is most useful when the decision is specifically about the revenue needed to support entered monthly costs and a user-selected target.
DealYield provides an educational scenario estimate. Verify leases, property statements, expense evidence, financing terms, market conditions, and local legal requirements with reliable sources and appropriately qualified professionals.