Revenue verification is the core of financial due diligence — confirming that the revenue the seller reported is real, attributable to the business as an ongoing concern, and likely to continue under new ownership. Multiple independent verification methods provide the most reliable picture.
Bank Statement Reconciliation
Request 36 months of bank statements for all business accounts. Total the monthly deposits and compare to the P&L revenue for each month and year. Significant unexplained differences — either above or below reported revenue — require explanation. For cash-heavy businesses, deposits will typically be less than reported revenue (cash kept for operating expenses), but the trend should be consistent and explainable.
Third-Party Data Sources
Many businesses have third-party revenue documentation that provides independent verification. POS systems produce transaction reports that can be compared to reported revenue. Sales tax returns submitted to the Illinois Department of Revenue provide another independent revenue check — the taxable sales reported to IDOR should be reasonably consistent with taxable revenue reported on the P&L. Insurance revenue for medical, dental, and therapy practices can be cross-verified against ERA (Explanation of Remittance) reports from payers.
Customer reference calls are the most qualitative revenue verification method. Speaking with 3–5 of the business's key customers about their spending history, satisfaction, and plans to continue using the business after an ownership change provides revenue sustainability insight that no financial document can replicate.
Recast Seller’s Discretionary Earnings, then apply a planning multiple for this Illinois business. Replacement labor is subtracted. This is a planning tool, not an appraisal.
Before debt, working-capital peg, holdback, and tax. Educational only.
What this Illinois guide is for
Verifying Business Revenue Claims in Due Diligence is a working answer for owners and buyers. We will not invent a statewide average sale price. We will show the earnings math, the Illinois clocks that delay a close, and the questions a serious counterparty will ask.
Marketplace context from BizBuySell’s Q2 2026 Insight Report (median reported sale $349,250, 2.7× cash-flow multiple, 14% of owners with a professional valuation) is context — not your quote.
Documents to gather this week
- Three years of signed business tax returns and matching P&Ls
- Year-to-date P&L, balance sheet, and three months of bank statements
- Current lease, amendments, and a plain-English remaining term
- License and permit list, including who holds each card
- Top-customer concentration (names redacted until an NDA)
A simple Illinois close calendar
Plan six to twelve months from cleanup to close on a prepared Main Street deal. Start CBS-1 and any Chicago or Cook notices at letter-of-intent, not the week of funding. Landlord consent often takes longer than the lender.
Related pages on this site
Educational only — not legal, tax, or a formal appraisal. Confirm bulk-sale notices, licenses, and tax allocation with counsel and a CPA.
Questions
No. This is education and planning math. A professional opinion of value is a confidential conversation. We work on a success fee if you engage a sale process. There is no file-upload portal.
Start with adjusted seller’s discretionary earnings, then a vertical planning band. A marketplace average is context, not your quote.
Personal professional licenses do not transfer. Municipal registrations and state notices have their own calendars. Confirm the path before you grant exclusivity.
Most prepared Main Street sales take about six to twelve months from cleanup to close. License transfers, landlord consent, and SBA underwriting add weeks.
CBS-1 is the Illinois bulk-sale notice. File it at least ten business days before an asset transfer that meets the statute. Late filing can put Illinois tax risk on the buyer.