Self-service car wash profitability and payback
Illustrative case · Four-bay retrofit of an existing leased wash site · United States · illustrative leased-site case
Explore this business · Profitability and payback
The base case generates $56,017 in first-year EBITDA after owner compensation and routine maintenance. First-year revenue is $259,891. These results depend on the utilization ramp and a usable existing site; they are not a reported industry margin.
The pump-system figure uses a prior dated item observation. The supplier now requires a current quotation; see the price status and installed-scope check before using this budget.
Paid bay time drives revenue
Mature demand equals bays × opening hours × available minutes ÷ occupied minutes per session × uptime × utilization. With these inputs, the site serves 90.2 sessions daily and earns $27,072 in a normalized month.
The first year ramps from 60.0% of mature demand to the full case over 12 months. The forecast assumes no wash subscription, detailing or separate vacuum income. That avoids relying on an extra revenue stream that has not been specified. Model assumptions.
Variable wash cost and fixed site commitments
| Item | Reference case |
|---|---|
| Water and sewer per session | $0.63 |
| Chemicals per session | $0.70 |
| Variable energy per session | $0.35 |
| Payment fees | 3.0% of sales |
| Total variable cost per session | $1.98 |
| All fixed monthly operating costs | $12,701 |
| Mature monthly EBITDA | $9,010 |
| Mature cash after debt | $6,367 |
Fixed costs include $4,000 rent, $1,200 routine repairs and maintenance, $1,941 employee cost and $3,360 owner compensation including burden each month. Base utility charges and common-area lighting sit in fixed expenses; session-related energy is variable. A major equipment replacement is excluded.
| Monthly commitment | Amount |
|---|---|
| Employee payroll, including burden | $1,941 |
| Working owner compensation, including burden | $3,360 |
| Rent | $4,000 |
| Fixed utilities | $400 |
| Insurance | $550 |
| Marketing | $300 |
| Software and communications | $200 |
| Routine repairs | $1,200 |
| Administration | $300 |
| Cleaning | $200 |
| Other operating allowance | $250 |
| Total monthly fixed operating base | $12,701 |
Test lower bay utilization
| Demand case | Year 1 sales | Year 1 EBITDA | Lowest cash over 60 months |
|---|---|---|---|
| Lower: 75.0% of base volume | $194,918 | $3,909 | $20,228 |
| Base demand | $259,891 | $56,017 | $44,748 |
| Higher: 115.0% of base volume | $298,875 | $87,282 | $48,976 |
The lower case holds rent, staffing, price and loan payments constant. It keeps positive cash but has much weaker first-year repayment coverage. The forecast is deliberately smooth: local rainfall, freezing weather, restrictions or downtime can create deeper monthly cash troughs.
Capital recovery follows operating cash
Under the base assumptions, total opening funding is recovered from cumulative pre-financing, pre-income-tax operating cash in month 38. The calculation includes the committed opening reserve and working-capital movements, with no terminal sale value or deposit release.
The lower-demand scenario does not recover the initial funding within five years. Capital recovery is distinct from loan amortization and from cash actually distributed to the owner. Repairs are expensed monthly, but a later full equipment replacement would extend recovery.
A self-service format still needs management
Annual owner compensation is $36,000 before personal taxes. The owner is expected to handle supplier coordination, cash controls, inspection scheduling and operational oversight alongside a paid attendant roster. The model assumes no additional distributions; it does not portray the site as passive income.
| Base reference case | Year 1 | Year 2 | Year 3 |
|---|---|---|---|
| Revenue | $259,891 | $324,864 | $324,864 |
| Operating surplus (EBITDA) | $56,017 | $108,125 | $108,125 |
| Profit before income tax | $15,828 | $69,221 | $70,641 |
| Principal + interest | $31,716 | $31,716 | $31,716 |
| Change in cash after debt | $22,669 | $76,409 | $76,409 |
| Year-end cash | $72,669 | $149,078 | $225,487 |
| Year-end loan balance | $187,732 | $174,179 | $159,206 |
Read the result before adopting the forecast
The base first-year operating result (EBITDA) is $56,017. The lowest modeled cash balance is $44,748, compared with the opening reserve of $50,000. The difference, $5,252.50, shows reserve consumed by the lowest point in the modeled horizon; it is not an additional equipment expense or a loan repayment estimate.
Compare the retained-site retrofit with purchase or major reconstruction. Property financing and civil works change both the funding uses and the repayment case.
Owner compensation is included. The same opening funding applies across the published demand scenarios. A higher installed procurement cost needs more funding or less opening cash and a rerun of the forecast. Compare the monthly cash exhibit and scenario period rather than inferring opening-year affordability from a mature-month margin.
Observed industry evidence
What the SBA records show
In the broader category’s FY2012–FY2016 cohort, 56 of 1,246 records with a paid-in-full or charged-off status were charged off (4.5%). A further 204 disbursed records have EXEMPT status and are outside that denominator.
This is a selected historical loan-outcome measure. It does not report operating margins or the chance of business failure. Use the cash scenarios below to test this specific project.
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Source: SBA 7(a) and 504 FOIA files, snapshot 30 June 2026. Recomputed from original records on 1 October 2026. FY2025 is the most recent complete fiscal year in these files. Definitions and exclusions.
See the opening cash trough
View the monthly cash figures
| Month | Lower demand | Base | Higher demand |
|---|---|---|---|
| 1 | $44,517 | $47,304 | $48,976 |
| 2 | $39,450 | $45,662 | $49,390 |
| 3 | $34,974 | $44,810 | $50,712 |
| 4 | $31,091 | $44,748 | $52,941 |
| 5 | $27,800 | $45,474 | $56,079 |
| 6 | $25,102 | $46,991 | $60,124 |
| 7 | $22,995 | $49,297 | $65,078 |
| 8 | $21,480 | $52,392 | $70,939 |
| 9 | $20,558 | $56,277 | $77,709 |
| 10 | $20,228 | $60,952 | $85,386 |
| 11 | $20,490 | $66,416 | $93,971 |
| 12 | $21,344 | $72,669 | $103,464 |
Sources and scope
- Reference-case assumptions and calculation method · Checked 2026-10-01 · Fictional US planning case authored 1 October 2026. Budget allowances, demand, rent, labor, finance and scenarios are assumptions, not market averages.
- SBA — 7(a) loans · Checked 2026-10-01 · United States; permitted uses, lender application process and ability-to-repay requirement. No approval, rate or equity percentage is promised.
- SBA — 504 loans · Checked 2026-10-01 · United States; qualifying long-term fixed assets; working capital and inventory excluded.
- Kleen-Rite — PSP400 four-bay pump system · Checked 2026-10-02 · Current page is call-to-order without a displayed price. The Oct 1 item observation retained in the model is historical, not a current offer. Pump stand only; water production, meters, bay/installation kits, site works and installed quotation are separate.
- EPA WaterSense at Work — Vehicle Washes · Checked 2026-10-01 · November 2023 US guidance: wash formats, water use and discharge considerations. The case water allowance and tariff are assumptions, not EPA price data.