How Do You Verify a Small Business’s Revenue Before Buying?

1. Request records that can be compared

Start with monthly profit-and-loss statements, annual business tax returns and complete statements for every business bank account. Request the last three completed financial years, where available, plus the current year to date. Add sales ledgers, invoice details, accounts-receivable aging reports, credit notes and payment-processor statements. For a newer business, request its full trading history and recognize that the shorter record limits what you can conclude.

Ask for native accounting exports, not just the seller’s summary spreadsheet. You need transaction dates, invoice numbers, customer identifiers, amounts and payment status. Establish which legal entities, locations and revenue streams the proposed purchase includes. A seller may show combined results even though one location or related company sits outside the deal.

Confirm the accounting basis before comparing totals. Cash-basis records generally recognize revenue when payment is received; accrual records generally recognize it when earned. Tax reporting may differ from management accounts. Have your accountant identify those differences early so you do not mistake a timing issue for fabricated sales—or accept an unexplained gap as routine.

2. Reconcile reported sales to independent evidence

Build a monthly reconciliation showing reported revenue, customer collections and the adjustments connecting them. Bank deposits are not automatically sales: they can include loans, owner contributions, transfers between accounts and customer deposits for future work. Conversely, processor fees withheld before settlement can make bank receipts lower than the sales that generated them.

For example, suppose a seller reports $100,000 in monthly sales, but the bank shows $112,000 in deposits. Your review identifies a $20,000 owner contribution. That leaves $92,000 potentially attributable to customers, not proof of $100,000 in sales. The remaining difference needs a documented explanation, such as unpaid invoices, processor settlement timing or collections relating to another month.

Compare annual sales with the relevant tax-return figures and request a written reconciliation for differences. Then tie the monthly records back to those annual totals. Tax returns provide another point of comparison, not a guarantee of accuracy. Material differences should be supported by underlying entries and documents, not an assurance that the bookkeeper handles everything.

3. Trace individual sales from order to collection

Totals can reconcile while the underlying sales remain questionable. Select transactions from several periods, including ordinary months, the latest year-end and any unusually strong month. Include large invoices, round-dollar entries, related-party transactions and sales recorded just before the business was marketed. Let your accountant determine an appropriate sample rather than relying on a handful chosen by the seller.

For each selected sale, match the customer order or contract to evidence of delivery or completed work, the invoice and the payment. In a service business, that might mean a signed proposal, job record, customer invoice and bank receipt. In an online retailer, it could mean an order, shipment record, processor settlement and any subsequent refund or chargeback.

Test in both directions: trace recorded sales to supporting evidence, and trace selected customer receipts back to the ledger. Examine post-period credit notes and refunds too. A large December invoice reversed in January deserves investigation. Unpaid invoices are not necessarily fictitious, but overdue balances, disputed work and weak collection history can undermine the earnings you are being asked to buy.

4. Check whether verified revenue will transfer

Real historical revenue can still be poor evidence of future performance. Build a customer-level sales table by month and year. Separate repeat customers from one-off projects, and identify revenue from the seller’s relatives, other businesses or personal relationships. Review both customer concentration and customer-level gross profit: the biggest account may contribute little after delivery costs.

Read the contracts behind important accounts. Check renewal dates, termination rights, pricing commitments and provisions governing assignment or a change of control. Ask your lawyer which consents the proposed transaction requires. A multiyear agreement does not guarantee multiyear revenue if the customer can terminate on short notice.

Suppose a cleaning company’s largest customer is approaching renewal and works directly with the owner. Verify payment history, understand the renewal process and assess who manages the relationship. With the seller’s permission, arrange an appropriately timed customer conversation. Do not contact customers behind the seller’s back; agree on confidentiality and outreach procedures before doing so.

5. Turn unresolved discrepancies into deal decisions

Maintain an exception log listing each discrepancy, its value, the seller’s explanation, the evidence required and its status. Distinguish explainable timing differences from unsupported revenue and uncertain retention. Set a resolution deadline before your diligence contingency expires or you otherwise become committed to closing.

Pause when the seller refuses complete records, repeatedly changes explanations or relies on claimed cash sales that cannot be substantiated. Undocumented cash revenue should not receive the same valuation treatment as verified earnings. A lower price does not make unreliable records trustworthy, and suspected falsification warrants advice from your accountant and lawyer before proceeding.

Where uncertainty is specific and measurable, possible responses include revising the earnings used for valuation, requiring customer consent before closing or negotiating contingent consideration. These terms need careful legal and lender review, including clear measurement and dispute provisions. Proceed only when you can explain the revenue trail and its remaining risks—not simply because the headline multiple looks attractive.

Keep going on WhatBiz

• Questions to Ask Before Buying a Business →
• Red Flags When Buying a Business →
• How to Calculate Owner's Cash Flow (SDE) →
• How to Value a Small Business →

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