What Due Diligence Really Is
Due diligence is the process of verifying, before you close, that the business you are buying is what the seller represented. It begins after your Letter of Intent is accepted and the seller grants exclusivity, and it typically runs 30 to 60 days. During this window you and your advisors examine the financials, legal standing, operations, and everything material to the business's future cash flow.
This is where deals are confirmed or unwound. Diligence is not a formality or a trust exercise — it is a disciplined investigation. The goal is not to find reasons to back out, but to confirm the facts, quantify the risks, and make sure the price and terms reflect reality. A buyer who does diligence well buys with confidence; one who skips it buys blind.
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Financial Due Diligence
Financial diligence verifies that the earnings you are paying a multiple for are real. This is the heart of the process. You and your CPA should:
- Reconcile the P&L to tax returns and bank statements — three years where possible; the numbers must tell the same story
- Scrutinize the add-backs that build Seller's Discretionary Earnings — are they legitimate and truly non-recurring, or is the SDE inflated?
- Test revenue quality — is it recurring or one-time, collectible, and trending up or down?
- Review receivables, payables, and inventory for aging and accuracy
- Confirm cash vs. accrual treatment and any undisclosed liabilities
Cash-based businesses deserve extra scrutiny: you cannot pay for profit a buyer cannot verify, and a lender will not finance it either. If the books don't reconcile, that is a finding, not a footnote.
Legal Due Diligence
Legal diligence confirms the business stands on solid ground and that you are buying what you think you are buying. With your attorney, review:
- Entity standing and ownership — good standing, cap table, any liens (UCC filings)
- Contracts — customer and supplier agreements, and whether they are assignable to a new owner
- The lease — remaining term, options, and the landlord's assignment terms (often a make-or-break item)
- Licenses and permits — what is required, and whether it transfers or must be re-issued
- Litigation and claims — past, pending, and threatened
- Intellectual property — trademarks, domains, and who actually owns them
Operational Due Diligence
Operational diligence answers the question that determines whether the business survives the sale: how much of it walks out the door with the seller? Examine:
- Customer concentration — does any single customer represent more than 15–20% of revenue?
- Owner dependency — are the key relationships, technical knowledge, or sales tied to the owner personally?
- Employees — tenure, roles, compensation, and who is essential to retain
- Suppliers and vendors — concentration, terms, and transferability
- Systems and processes — is the business documented, or does it live in the owner's head?
A profitable business that is entirely dependent on the departing owner is a very different (and riskier) purchase than one that runs on systems and staff.
The Due Diligence Document Checklist
Request these from the seller early — a cooperative seller provides them promptly; a reluctant one is itself a finding:
- Three years of tax returns, P&Ls, and balance sheets, plus year-to-date financials
- Bank statements and merchant-processing statements
- Add-back / SDE schedule with support
- Accounts receivable and payable aging
- Customer list with revenue concentration (often anonymized until later)
- Lease and any real-estate documents
- Employee roster, roles, pay, and any agreements
- Key contracts, licenses, and permits
- Equipment list and asset schedule
- Insurance policies and any claims history
What Happens When Problems Surface
Findings are normal — almost no business is perfect. What matters is how material they are and how you respond. Common outcomes:
- Renegotiate the price to reflect a quantified issue (e.g., overstated add-backs)
- Restructure the deal — an escrow holdback, an indemnity, or specific reps and warranties
- Adjust terms — a larger seller note, a longer transition, or an earnout tied to retained customers
- Walk away — the right answer when a material problem cannot be fixed or priced
The willingness to walk is what gives a buyer leverage and protection. If a deal only works when you ignore what diligence found, it doesn't work.
Timeline and Your Diligence Team
Plan for roughly 30 to 60 days of active diligence once the LOI is signed, overlapping with financing. You do not do this alone: a CPA confirms the earnings are real, an attorney surfaces legal and contractual risk, and an experienced broker coordinates the process and flags what is off. Their fees are trivial next to the cost of buying a business that isn't what it appeared to be. Pair this process with our guides on red flags to watch for and the questions to ask the seller.
Frequently Asked Questions
What is due diligence when buying a business?
Due diligence is the process of verifying, before closing, that a business is what the seller represented, financially, legally, and operationally. It begins after the Letter of Intent is accepted and typically runs 30 to 60 days, during which the buyer and their advisors examine financials, contracts, the lease, customers, employees, and liabilities.
How long does due diligence take?
Active due diligence usually takes 30 to 60 days once the Letter of Intent is signed, often overlapping with loan underwriting. Complex businesses take longer. Rushing diligence is how buyers miss red flags, so the timeline should reflect the size and complexity of the business.
What should I check in financial due diligence?
Reconcile the profit and loss statements to tax returns and bank statements, scrutinize the add-backs that build SDE, test whether revenue is recurring and collectible, review receivables, payables, and inventory, and confirm there are no undisclosed liabilities. Cash-heavy businesses require extra verification.
What happens if due diligence finds problems?
Findings are common and don't automatically end a deal. Depending on how material they are, the outcome may be a renegotiated price, an escrow holdback or indemnity, adjusted terms such as a larger seller note or earnout, or walking away if the problem cannot be fixed or fairly priced.
Buying a Business? Get Diligence Right.
Martin Navarro helps buyers structure and run due diligence so nothing important gets missed. Let's talk about the business you're evaluating, confidentially and with no obligation.
Request a Buyer Consultation Call or text: 818-633-3254 · 365navarro.martin@gmail.com