Self-storage starts covering day-to-day expenses when rental income is sufficient to pay operating costs. That does not yet mean recovering the money spent on construction. Separate these two goals: covering the facility’s monthly costs and recouping the initial investment.
Three figures you should not confuse
- Revenue: sales after discounts, not the full site’s maximum published prices.
- Operating result: revenue minus the operating costs included in the calculation.
- Cash: money actually received and paid, including equipment purchases and financing repayments.
An occupied unit does not always mean a paid invoice. Monitor receivables and payments as well as occupancy. If your units vary in size, also track the rented floor area and revenue. Ten occupied small units do not produce the same result as ten large ones.
How to calculate your break-even point
For identical units, the simplified formula is: divide monthly fixed costs by the income from one rented unit after subtracting costs that depend on renting it out. Round the result up. This is the number of paid units needed to cover the costs included in your calculation. [SBA — break-even point]
Fixed costs are the charges you actually incur regardless of customer numbers. Variable costs may include payment processing fees or other charges that rise with sales. Do not put the same expense in both groups. If your offer includes different unit sizes, calculate rental scenarios for each size instead of using an unexplained single average.
The formula makes sense when the price minus variable cost is positive. If each additional rental loses money even before fixed costs, increasing occupancy will not solve the problem. You need to change the price, service cost or structure of the offer.
A worked example — not a market forecast
The figures below are purely illustrative inputs for learning the calculation. They are not market prices or the budget of a real facility. Assume 20 identical units, monthly revenue of PLN 300 per paid unit and PLN 15 in variable costs. All figures are compared on the same basis, excluding VAT.
| Item | Illustrative amount |
|---|---|
| Site rent | PLN 1,000 |
| Software and connectivity | PLN 200 |
| Energy | PLN 100 |
| Accounting and insurance | PLN 250 |
| Marketing | PLN 300 |
| Maintenance and call-outs — reserve | PLN 250 |
| Total | PLN 2,100 |
Each unit contributes 300 − 15 = PLN 285 towards fixed costs. Dividing 2,100 by 285 gives 7.37, so at least 8 paid units are needed: 40% of the 20 available.
| Paid units | Revenue | Variable costs | Surplus after fixed costs |
|---|---|---|---|
| 6 of 20 | PLN 1,800 | PLN 90 | −PLN 390 |
| 8 of 20 | PLN 2,400 | PLN 120 | PLN 180 |
| 12 of 20 | PLN 3,600 | PLN 180 | PLN 1,320 |
| 16 of 20 | PLN 4,800 | PLN 240 | PLN 2,460 |
This simplified calculation excludes income tax, depreciation, financing instalments, additional compulsory charges and the owner’s remuneration. Your spreadsheet must account for these in the appropriate places. The example’s 40% is therefore not a universal self-storage break-even threshold.
When will you recover your investment?
Calculate payback from the surplus remaining after the obligations you have included, not from revenue alone. Allow for the start-up months, equipment replacements and subsequent phases. Dividing the purchase cost of containers by revenue from a full site gives an oversimplified picture.
Also prepare a scenario with a lower post-promotion price and a slower take-up of units. Examine how the number of customers needed and the cash buffer change. A forecast is more useful when it shows a range of outcomes and explains the differences, rather than promising payback on one particular date.
What should you update each month?
Compare the plan against the number of paid units, average prices after discounts, arrears and actual expenses. Test slower sales and an increase in land rent. This will show whether you have the funds to keep attracting customers before deciding to expand.
Sources
Sources checked: .