Due diligence is the period after a Letter of Intent is signed where the buyer (and their advisors) verify everything the seller represented about the business. It typically lasts 30–60 days for smaller businesses and 60–90 days for mid-market transactions. How well a seller is prepared for due diligence directly affects how quickly — and whether — the deal closes.
Financial Due Diligence
The buyer's accountant or financial advisor will review: tax returns cross-referenced against the SDE recast, bank statements reconciled to P&L, payroll records, accounts receivable aging, and customer revenue analysis. Any material discrepancy between what the seller represented and what the records show is a deal-threatening event. Sellers who have clean, organized financial records move through this phase in days rather than weeks.
Legal and Operational Due Diligence
The buyer's attorney reviews: the lease and all amendments, all significant customer and supplier contracts, employment agreements, insurance policies, any pending litigation or regulatory issues, licenses and permits, and corporate formation and ownership documentation. Operational due diligence may include site visits, customer reference calls, employee interviews, and technology/equipment assessments.
Sellers should approach due diligence as a collaborative process, not an adversarial one. Buyers who feel sellers are forthcoming, organized, and transparent develop confidence that accelerates closing. Sellers who appear evasive, disorganized, or defensive create doubt that slows or kills deals. Preparation before marketing eliminates most due diligence surprises.
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
What Happens During Business 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.
Illinois diligence that is not optional
Three years of tax returns, bank statements that match the P&L, the lease, licenses, customer concentration, and any environmental file belong in the first data room. See the buy-side checklist.
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.