Practical guide
Buying a Business Due Diligence Checklist
Due diligence is not a search for reasons to like a business. It is a structured attempt to verify the seller’s claims, identify what will change after closing, and price the risks you would inherit.
Ask for source evidence, reconcile inconsistencies, and record unresolved issues. If a material claim cannot be verified, treat it as uncertain rather than true.
Financial due diligence
- Compare tax returns, bank deposits, point-of-sale exports, invoices, and financial statements.
- Normalize earnings for owner labor, personal expenses, unusual items, and deferred costs.
- Review gross margin, inventory adjustments, payroll, debt, working capital, and seasonality.
- Model break-even and cash needs under conservative revenue.
Lease due diligence
- Read the full lease and amendments; do not rely on a rent summary.
- Confirm assignment, landlord consent, guarantees, options, increases, common charges, and repair duties.
- Check whether licenses and permitted use fit your planned operation.
- Compare the remaining term with the time needed to recover the acquisition cost.
Operational due diligence
- Document workflows, opening hours, staffing, systems, suppliers, equipment, and maintenance.
- Identify tasks and relationships dependent on the seller.
- Check inventory quality, technology access, records, passwords, and transition support.
- Estimate the cost of operating the business without unpaid seller labor.
Customer and demand due diligence
- Measure customer concentration, repeat rate, churn, seasonality, refunds, and channel dependence.
- Verify contracts, memberships, reviews, marketing accounts, and lead sources.
- Determine whether customers follow the brand, location, employees, or owner.
- Test local demand and competition independently of seller claims.
Legal and liability due diligence
- Review entity ownership, licenses, permits, contracts, liens, taxes, litigation, and insurance claims.
- Confirm employee status, accrued obligations, deposits, gift cards, warranties, and prepaid orders.
- Define exactly which assets and liabilities transfer.
- Use appropriate legal and accounting professionals before signing.
Red flags
- Records are incomplete, inconsistent, recently reconstructed, or available only as summaries.
- The seller pressures you to move before lease, tax, or operational questions are answered.
- Reported profit disappears after adding owner replacement labor and necessary expenses.
- The transaction depends on verbal promises from the landlord, staff, customers, or suppliers.
- The price assumes growth that has not yet occurred.
Related tools and reading
Frequently asked questions
How long does small business due diligence take?
The time varies with complexity and record quality. Do not let an arbitrary deadline replace review of material financial, lease, legal, and operational facts.
What documents should a seller provide?
Typical evidence includes tax returns, bank and POS records, financial statements, lease documents, payroll, contracts, licenses, inventory, and liability records.
Who should help with due diligence?
Depending on the deal, use a qualified attorney, accountant, tax adviser, lender, insurance adviser, and industry specialist.
What if the seller cannot prove revenue?
Do not pay for unverified revenue. Value the business using evidence you can substantiate and treat missing records as increased risk.