Break-Even Occupancy Calculator with Worked Example
1. Short answer
Break-even occupancy is the share of your contracted rent you need in order to exactly cover your costs. Anything above it is profit, anything below it comes out of your own pocket.
Break-even occupancy = (fixed operating costs + debt service) ÷ collectable annual rent × 100%
On the apartment that runs through these metric pages, financed with an annuity, that is 110.35%. Above one hundred, and that is not an error: with twelve months of uninterrupted letting this property still does not cover its costs.
2. What break-even occupancy is, and what it is not
DSCR asks how much headroom you have above your debt service. Break-even occupancy asks the same question from the other side: how much vacancy can you take before that headroom is gone? The DSCR page states the link briefly; this page is about the formula itself, the two branches the tool carries, and what a result above 100% actually tells you.
It is a cost metric, not a return metric. A break-even occupancy of 70% says the property is robust against vacancy, not that it performs. A property with low rent and a small loan can show an excellent break-even and a dismal net initial yield.
Nor is it a forecast. The result says where the line sits, not where your occupancy will land. What you do with it is set the line against your own vacancy assumption: budget for 4% vacancy and you run at 96%, so you need a break-even below 96%.
What BRIX Calc does. The rental calculator runs on theoretical annual rent: twelve months full, every payment made. That is the same denominator gross yield and the gross rent multiplier use. Vacancy is therefore not an input to the formula; it is the output.
The result is not capped at 100%. That is deliberate: a property that fails to cover its costs at full occupancy should say so, rather than appear as "100% and therefore just enough".
3. The formula, component by component
Denominator: collectable annual rent. Theoretical annual rent, reduced by the bad-debt percentage you assume. Bad debt belongs in the denominator rather than the numerator because it scales with the rent you collect: at half occupancy the loss is halved too.
Numerator: fixed costs plus debt service. The operating costs that run regardless of occupancy (insurance, maintenance, service charges, property taxes) plus interest and principal together.
Management has two branches, and they shift the answer. Enter the management fee as a percentage of rent and it is not a fixed cost: it scales with what you collect. The engine then takes it out of the numerator and shrinks the denominator:
Break-even = (fixed costs + debt service) ÷ (annual rent × (1 − bad debt%) × (1 − management%)) × 100%
Enter it as a fixed amount and it is a running cost. It then sits in the numerator and the denominator is left alone:
Break-even = (fixed costs + fee + debt service) ÷ (annual rent × (1 − bad debt%)) × 100%
Same property, same amounts, two answers. The gap is small but real, and it is exactly the kind of thing on which two models diverge without anyone seeing why.
Three edge cases. With no rent there is no break-even to calculate. At 100% bad debt or a 100% management fee the denominator disappears and there is no answer either. And a result above 100% stands as it is.
4. Worked example
The same renovated 75 m² apartment, financed with a € 199,500 annuity at 5.0% over thirty years. Management is set at 3% of rent.
| Item | Amount |
|---|---|
| Base rent per month | € 1,475 |
| Theoretical annual rent | € 17,700 |
| Operating costs excluding management | € 6,095 |
| Management (3% of € 17,700) | € 531 |
| Interest in year 1 | € 9,908 |
| Principal in year 1 | € 2,943 |
| Debt service together | € 12,851 |
Break-even = (6,095 + 12,851) ÷ (17,700 × 0.97) = 18,946 ÷ 17,169 = 110.35%
| Metric | Value | What it means |
|---|---|---|
| Break-even occupancy | 110.35% | Full occupancy does not cover the costs |
| With a fixed management fee | 110.04% | Same property, different input mode |
| Without financing | 35.50% | What the operation alone requires |
| Vacancy headroom | − 10.35% | There is no headroom, there is a shortfall |
The third row explains where the other three come from. The operation itself needs only 35.50% occupancy. The full 74.85 percentage points on top of that are the loan. Anyone wanting to lower the break-even has to work on the financing, not on the service charge.
Sensitivity. With an interest-only loan instead of an annuity the principal disappears and debt service is interest alone: € 9,975 on the full balance, slightly more than the € 9,908 of interest the annuity costs in year one. Break-even falls to 93.60% as a result. Still tight, but on the right side of a hundred. Add 2% bad debt on top and it lands at 95.51%.
5. What counts as a good break-even occupancy?
The number travels reasonably well between markets, but the acceptable level depends on how volatile letting is locally. Indicative ranges, not published data:
| Range | What it usually means |
|---|---|
| under 70% | Comfortable buffer; an empty quarter does no damage |
| 70% to 85% | Normal for a market-rate financed residential unit |
| 85% to 100% | Tight; one vacant month or one arrears case costs you money |
| above 100% | Full occupancy does not cover the costs; something has to change |
Set the result against your own vacancy assumption rather than a rule of thumb. For a mainstream dwelling in a tight market, 90% occupancy is a pessimistic assumption; for a room-let property or a retail unit with frequent turnover it is an optimistic one.
And note what a result above 100% does and does not mean. The property is not worthless: this is the same apartment the return on equity page shows at 5.27%. It means the return comes entirely from principal repayment and capital growth rather than from cash flow, and that you have to be able to top it up every month.
6. Three mistakes that distort the number
Applying vacancy in the denominator as well. Run the break-even on rent already net of a void allowance and you deduct the same effect twice, so the result comes out too high. The denominator is theoretical rent; vacancy is the output, not the input.
Leaving principal out of the debt service. Repayment is not a cost, but it does leave your account every month. Omit it and you have calculated the break-even of the ICR, not of your bank balance. On this property that is the gap between 93.60% and 110.35%.
Comparing two properties without checking the management mode. Percentage versus fixed amount is worth 0.31 percentage points here, and more on a property with a higher fee. Two models filling that in differently give different answers on the same building.
7. Run your own numbers
Enter your own rent, fixed costs, debt service, management percentage and bad debt above. Both management modes appear side by side, along with what is left without financing, so it is immediately visible how much of the break-even the loan accounts for. To have the costs calculated year by year, including indexation and an expiring fixed-rate period, the BRIX Calc rental calculator models the whole term.
8. Frequently asked questions
Can break-even occupancy exceed 100%?
Yes, and in the worked example it does. It means the rent at twelve months of uninterrupted letting does not cover operating costs and debt service. The tool does not cap it, because a result of exactly 100% would read as "just enough" while in reality money has to go in every month.
How does it differ from DSCR?
Same relationship, expressed the other way round. DSCR divides your NOI by debt service and gives a ratio; break-even occupancy divides your costs by your rent and gives a percentage. A DSCR below 1.00 and a break-even above 100% therefore point at the same problem. On this property that is a DSCR of 0.86 alongside a break-even of 110.35%.
Does principal repayment belong in it?
Yes. The question is whether you get through the month, and repayment leaves your account just as surely as interest does. To see whether interest alone is covered, use ICR: a different figure with a different purpose.
Why does the answer change when I enter management differently?
Because the engine has two literal branches. As a percentage the fee scales with the rent and shrinks the denominator; as a fixed amount it is a running cost and sits in the numerator. Both are correct for their own situation: an agent billing per let month is a percentage, an annual retainer is a fixed amount.
Does more rent or lower costs help more?
They are almost level here: € 1,000 less in fixed costs lowers the break-even by 5.83 percentage points, € 1,000 more annual rent by 5.90. That they land so close is a coincidence of these numbers. Costs work undiluted in the numerator, while rent passes through bad debt and the management percentage first, but against that a larger denominator shrinks the whole fraction. Above one hundred percent rent wins narrowly; below it, the cost side does. Either way the real lever is the financing, as the table in section 4 shows.