How to Calculate Break-Even Occupancy for an Apartment Deal
Break-even occupancy is the share of a building's gross potential income it must collect to pay all operating expenses and debt service. The formula is (operating expenses + annual debt service) / gross potential income. A lower number means more room for vacancy, concessions or bad debt before the property stops covering its bills.
It is one of the simplest risk measures in apartment investing, and one of the most useful, because it combines the expense budget and the loan in a single number investors can compare with the market. This guide shows the formula, a made-up example with a stress test, and how lenders and investors use it.
What is the break-even occupancy formula?
Break-even occupancy = (operating expenses + annual debt service) / gross potential income
- Gross potential income (GPI) is what the building would collect with every unit leased at market rent, plus other income such as parking, fees or utility reimbursements at full occupancy.
- Operating expenses are taxes, insurance, payroll, repairs, utilities, management and the rest, before debt service.
- Debt service is the year's loan payments, principal and interest.
Some sponsors also add replacement reserves to the top line, which gives a stricter number. Say which version you use. Also note the simplification: some expenses fall when units are empty, but many (taxes, insurance, debt) do not, so the formula treats all expenses as fixed.
A made-up example
A 60-unit building has an average market rent of $1,400. All numbers are made up.
| Line | Amount |
|---|---|
| Gross potential rent (60 x $1,400 x 12) | $1,008,000 |
| Other income at full occupancy | $72,000 |
| Gross potential income | $1,080,000 |
| Operating expenses | $430,000 |
| Annual debt service | $380,000 |
| Expenses plus debt service | $810,000 |
| Break-even occupancy ($810,000 / $1,080,000) | 75.0% |
| With $21,600 of reserves ($831,600 / $1,080,000) | 77.0% |
If the sponsor expects 95% economic occupancy, the cushion is 20 points: the building could lose 20 more points of collected income before it fails to cover its bills.
How do you stress test break-even occupancy?
Change one input at a time, then a combination. Same made-up building:
| Scenario | Expenses | Debt service | GPI | Break-even |
|---|---|---|---|---|
| Base case | $430,000 | $380,000 | $1,080,000 | 75.0% |
| Higher rate on a floating loan (+$60,000 debt service) | $430,000 | $440,000 | $1,080,000 | 80.6% |
| Property tax reassessed (+$54,000 expenses) | $484,000 | $380,000 | $1,080,000 | 80.0% |
| Rents 5% lower | $430,000 | $380,000 | $1,029,600 | 78.7% |
| Higher rate and higher taxes together | $484,000 | $440,000 | $1,080,000 | 85.6% |
| Supplemental loan adds $180,000 debt service | $430,000 | $560,000 | $1,080,000 | 91.7% |
How the numbers work: $870,000 / $1,080,000 = 80.6%; $864,000 / $1,080,000 = 80.0%; rents 5% lower give $957,600 of rent plus $72,000 of other income, and $810,000 / $1,029,600 = 78.7%; $924,000 / $1,080,000 = 85.6%; $990,000 / $1,080,000 = 91.7%.
Three lessons. Taxes often jump after a sale, see property tax reassessment. Floating rate loans move debt service, which is why an interest rate cap matters. And added debt, such as an agency supplemental loan, can shrink the cushion fast.
Why do lenders and investors look at it?
Lenders size loans on the debt service coverage ratio (DSCR): net operating income divided by debt service. At break-even occupancy, DSCR is exactly 1.0x. Lenders require more. Freddie Mac's fixed-rate product sheet, for example, lists a minimum amortizing DCR of 1.25x (Freddie Mac), and Fannie Mae defines DSCR as net cash flow over principal, interest and certain other required payments (Fannie Mae Multifamily Guide).
In the example, NOI at 95% occupancy is $1,080,000 x 95% - $430,000 = $596,000, so DSCR is $596,000 / $380,000 = 1.57x. To hold 1.25x, NOI must be at least $475,000, which needs $905,000 of income, or about 83.8% of GPI. That is the occupancy where the deal would start to fail a lender's coverage test, even though it still covers its bills.
Investors use break-even to judge downside. Compare it with real occupancy in the market. The Census Bureau reported a national rental vacancy rate of 7.6% for the third quarter of 2026 (Census HVS), but your submarket and your building's history matter more than a national number.
What is a good break-even occupancy?
There is no single number that is good for every deal. What matters is the cushion: how far expected economic occupancy sits above break-even, and how that cushion holds up in your stress cases. A value-add deal in the middle of renovations may run close to break-even for a while on purpose, with reserves to cover it. A stabilized deal with a thin cushion has less room for surprises. Explain your number and your plan for the lean months.
What mistakes should you avoid?
- Using physical occupancy. A unit that is leased but not paying does not help. Use economic occupancy. See economic vs. physical occupancy.
- Counting other income you have not proven. If GPI includes new RUBS or fee income, test the case without it. See RUBS utility billing.
- Ignoring concessions and bad debt. They lower collected income just like vacancy.
- Using the seller's expenses. Rebuild expenses for your ownership, especially taxes and insurance.
- Leaving out interest-only burn-off. If payments rise when interest-only ends, run break-even at the higher payment too.
How DoorRaise fits in
DoorRaise helps sponsors raise equity for apartment buildings with 5+ units from their friends and followers under Rule 506(b) or 506(c). It does not underwrite your deal: break-even and the assumptions behind it are yours. DoorRaise prepares the standard offering documents, forms the LLC, files Form D and state notices, and verifies accredited investors for 506(c). Investors fund by wire into escrow at Enterprise Bank & Trust, an FDIC-insured bank, and distributions are quarterly by default. Fees are $1,500 to set up (non-refundable), $5,000 at closing (only if the deal closes) and $3,500 a year, with no percentage of the raise.
Raise your apartment deal from the people who already follow you.
DoorRaise is built for apartment buildings with 5 or more units: one link for the deal, escrow until closing and a standard fee card.
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FAQ
What is the formula for break-even occupancy?
(Operating expenses + annual debt service) / gross potential income. Some versions add replacement reserves to the top line.
Is lower break-even always better?
Lower means more room for vacancy, which reduces risk. But it can also mean low leverage or a conservative budget, which affects returns. Look at it together with the business plan.
How is break-even different from DSCR?
DSCR measures how much NOI covers debt service at a given occupancy. Break-even is the occupancy where DSCR equals 1.0x.
Should I include capital expenses?
Recurring replacement reserves, yes, as a stricter version. One-time renovation costs funded from the raise are usually left out and covered by reserves.
Does break-even change over time?
Yes. It moves with rent growth, expense changes, tax reassessments and any change in debt service.
Next step: read multifamily underwriting basics to see how break-even fits with cap rate, DSCR and returns.
Sources
- U.S. Census Bureau: Housing Vacancies and Homeownership, current release
- Freddie Mac Multifamily: Optigo Fixed-Rate Loan product sheet (4/26)
- Fannie Mae Multifamily Guide (DSCR definition)
This article is general information, not legal, tax or investment advice. Check your assumptions with your lender and your own advisers. DoorRaise is not a law firm, broker-dealer, investment adviser or funding portal.