A useful financial metric states its scope, period, accounting basis and remaining exclusions. Before comparing a wash with another business or an asking price, identify the numerator and denominator and reconcile them to the records. Similar labels can conceal different calculations.
Separate sales, collections and obligations
POS sales, member billings, earned revenue, processor settlements and bank deposits measure different events. Tax, refunds, discounts, fees, prepayments and settlement timing need their own explanations. A deposit may include financing or an internal transfer rather than wash revenue. Use the revenue case to trace the bridge.
Collected sales tax is separate from net service revenue. A prepaid membership or gift balance may create a continuing service obligation even when cash has arrived. Accounting recognition, tax treatment and the buyer/seller’s negotiated closing liability need not use identical figures. Do not combine them without a supported definition.
Use a consistent cost and earnings basis
Direct costs and operating expenses may be classified differently between businesses. Reconcile the presentation of payroll, utilities, chemicals, repairs and occupancy before comparing margins. Cash paid to a payroll provider can differ from wage expense because of deductions, employer costs, accruals and settlement balances.
SDE, EBITDA, a managed-earnings planning proxy and property NOI are distinct. An owner-benefit adjustment does not eliminate continuing management work. Property NOI requires a property-level income and expense definition, with consistent occupancy assumptions; relabeling business cash flow is not enough.
| Metric | Definition to establish | Useful next review |
|---|---|---|
| Payroll cash versus expense | Matched funding and pay periods; selected accounting basis; employer cost population | Payroll reconciliation |
| Recorded tax versus sales | Tax-exclusive base, entered treatment/rate, filed field and remittance period | Tax-record review |
| Receivable aging | Open invoice balance at an as-of date and contractual due date | Fleet collections |
| Customer concentration | Customer net revenue divided by matched segment or whole-site net revenue | Keep each denominator visible |
| Cohort contribution payback | Cumulative earned contribution of a fixed acquired group versus allocated acquisition spend | Promotion review |
| Operating debt coverage | Defined operating cash-flow numerator and scheduled debt-service denominator | Written financing terms |
| Cash-on-cash planning return | Defined annual cash after stated obligations divided by total invested cash | Acquisition cash-flow model |
Complete a fictional acquisition return
Assume a $1,000,000 purchase price and an $800,000 fixed-rate loan at a fictional 9.5% nominal annual rate, paid monthly over 120 months with no balloon. Scheduled annual debt service is $124,221.66. Price equity is $200,000. Add $25,000 cash fees, $20,000 initial improvements and $35,000 opening working capital: total invested cash is $280,000.
Now specify the operating numerator. Enter annual adjusted owner benefit of $220,000, replacement management of $60,000, a $20,000 annual maintenance-capital reserve and zero incremental annual working capital. Operating cash before debt and that reserve is $160,000. After scheduled debt and the reserve, annual planning cash is $15,778.34.
Invested cash = $200,000 + $25,000 + $20,000 + $35,000 = $280,000 Annual planning cash = $220,000 − $60,000 − $20,000 − $124,221.66 = $15,778.34 Cash-on-cash planning return = $15,778.34 ÷ $280,000 = 5.64%
Operating coverage before the reserve is about 1.29×; after the reserve it is about 1.13×. These are defined planning ratios, not lender approval thresholds. The example excludes income taxes, exit proceeds, appreciation, additional financing and any cost not explicitly entered. Opening working capital is invested cash, while an incremental annual need would be a separate cash-flow deduction; do not count the same funding twice.
Read edge cases before comparing ratios
A zero or negative denominator can make a percentage undefined rather than zero. A very small denominator can produce an extreme figure without a meaningful business comparison. Check the underlying dollar difference and the source population. Negative contribution and incomplete costs should remain visible instead of being hidden in a favorable average.
A fleet customer can represent 50% of fleet revenue and 6% of whole-site revenue in the same fictional case. An invoice’s overdue status does not establish customer concentration. Similarly, original-cohort retention, net membership growth and contribution payback answer different questions. A first recovery month can be followed by a later loss or refund that reverses recovery.
Connect the ratios to a supported decision
Reconcile accepted adjustments, model continuing work and test funding at the monthly low point. Use matched historical observations and a separately labeled downside. Revenue changes do not translate one-for-one into earnings changes when costs behave differently. The cash-runway model and monthly earnings comparison preserve those timing and period distinctions.
A completed calculation describes entered assumptions. It does not authenticate documents, establish market value or approve financing. Review the definition beside each result before using it in a purchase, sale or lender discussion.
Sources and scope
Official and original sources checked October 31, 2026. These sources support the identified rules and methods; they do not verify a particular business or property.
- Stripe — Stripe — CAC payback periodThe arithmetic section relates acquisition spending to new customers and recovery through revenue less service cost. General provider education. Do not import SaaS benchmarks or constant-margin assumptions into a wash cohort with changing retention and usage.
- IRS — IRS — General Instructions for Forms W-2 and W-3The IRS calls for reconciling corresponding annual wage and withholding fields and investigating valid reasons for differences. Gross payroll and taxable wage fields need not be identical. Current-year and prior-year adjustments need separate treatment.
- New York Tax — New York Tax — Recordkeeping Requirements, TB-ST-770Detailed records should connect source transactions with books and returns and support tax status. POS summaries alone do not replace transaction evidence. A balanced worksheet does not prove the underlying records are complete or that tax treatment is correct.
Continue your review
Verify the revenue · Normalize earnings · Model the cash flow