What is Due Diligence When Buying a Business

Introduction

Due diligence is the investigation period after a buyer and seller agree on price and terms but before the sale closes. It's your chance to verify the seller's claims, uncover hidden problems, and confirm that the business is worth what you're paying. Skipping or rushing due diligence is the most common and most expensive mistake business buyers make.

The Due Diligence Timeline

A typical due diligence period lasts 30 to 90 days, depending on the complexity of the business. The timeline is specified in your Letter of Intent or Purchase Agreement. During this period, you have the right to:

• Access the seller's financial records, contracts, and operational documents
• Inspect equipment, inventory, and facilities
• Meet with key employees (usually with the seller present)
• Review customer and vendor relationships
• Investigate legal and regulatory compliance

If you discover material problems during due diligence, you can renegotiate the price, request remediation, or walk away from the deal entirely (usually with your earnest money deposit returned).

Financial Due Diligence

Financial verification is the foundation of due diligence. Request and analyze:

Tax returns (3 years): The most reliable financial document because they've been filed with the IRS. Compare reported revenue to the seller's representations

Profit and loss statements (monthly, 3 years): Look for seasonal patterns, declining trends, and unusual spikes or dips that need explanation

Bank statements (12-24 months): Verify that deposits match reported revenue. Look for unexplained transfers or personal expenses run through the business

Accounts receivable aging report: How much is owed to the business and how old are the receivables? Anything over 90 days is likely uncollectible

Accounts payable: What does the business owe? Are there any disputed amounts or past-due obligations?

Sales tax filings: Cross-reference with reported revenue — these are very difficult to manipulate

Payroll records: Verify employee count, compensation, and benefits obligations

Operational Due Diligence

Beyond the financials, investigate the business operations:

• Customer concentration: If any single customer represents more than 15-20% of revenue, that's a significant risk. If that customer leaves, your revenue drops dramatically
• Employee assessment: Which employees are critical? What happens if they leave? Are there employment agreements in place?
• Vendor relationships: Are there favorable pricing agreements that transfer with the sale? Are any vendor contracts expiring soon?
• Technology systems: What software, websites, and technology does the business rely on? Are licenses transferable?
• Intellectual property: Trademarks, patents, proprietary processes, customer lists — what's included in the sale?
• Insurance: Review current coverage and any pending or past claims

Legal Due Diligence

Your attorney should investigate:

1. Pending or threatened lawsuits against the business
2. Regulatory compliance: Licenses, permits, inspections, and any violations or citations
3. Environmental issues: Particularly important for manufacturing, auto, and gas station businesses
4. Lease review: Assignment provisions, remaining term, renewal options, and landlord approval
5. Liens and encumbrances: UCC filings, tax liens, or judgments against the business or its assets
6. Contract review: All material contracts with customers, vendors, and service providers

Red Flags During Due Diligence

Walk away or renegotiate if you discover:

• Revenue declining with no clear explanation or recovery plan
• Significant discrepancies between reported income and bank deposits or tax filings
• Undisclosed liabilities or lawsuits
• Key customer departures that haven't been disclosed
• Environmental contamination that would require expensive remediation
• Equipment in worse condition than represented
• Seller unwillingness to provide requested documents or answer questions directly

Not every red flag is a deal-killer, but each one should either be resolved, reflected in a price adjustment, or covered by additional protections in the purchase agreement.

Final Thoughts

Buying a business is a significant financial and personal commitment. Take your time, do thorough due diligence, and work with experienced professionals — a business broker, attorney, and accountant — to guide you through the process. The right acquisition at the right price can be a life-changing investment.

Browse businesses for sale on BuyThe.Biz to start your search, or visit our Q&A forum to ask questions and get advice from experienced business owners and brokers.