Quick answer: Legal due diligence is buyer counsel’s check that the seller owns what it is selling and that nothing in the paperwork blocks or burdens the sale. The checklist covers ownership records, material contracts and their change-of-control clauses, intellectual property and assignments, licenses and permits, litigation, real estate and insurance. Findings become closing conditions, specific indemnities, escrows or price deductions, and a seller who fixes the records first gives counsel fewer items to raise.
Key points
- Legal diligence tests title and transferability: whether the seller owns the company, the intellectual property and the contracts it says it does, and whether a sale triggers consent rights or terminations.
- A change-of-control or anti-assignment clause lets a customer, landlord or licensor consent, renegotiate or walk away, so buyer counsel lists every such clause before signing.
- Intellectual property built by contractors, or by the owner before the company existed, is a common gap, and the usual fix is a signed assignment obtained before launch.
- Findings reach the deal as closing conditions, specific indemnities, escrows or price deductions, and each item the seller fixes before launch is one fewer to negotiate.
What buyer counsel is trying to prove
Legal diligence tests title and transferability. Buyer counsel asks whether the seller owns the company and the assets being sold, whether those assets and contracts carry over under the proposed structure, and what claims could follow them. The answers shape the disclosure schedules, the consents required before closing and the indemnity the seller gives.
Counsel usually works from a request list sent after the letter of intent. Ownership and authority records come first, because a defect there stops everything else. Contracts and intellectual property follow, with litigation, permits, real estate and insurance in parallel. The output is an issues list sorted by what each item needs: a fix by the seller, a third-party consent, protection in the purchase agreement or a price discussion. SBA’s guide to buying an existing business lists contracts, leases, licenses and permits, zoning and, where real property is included, environmental regulations among the subjects of due diligence, and recommends working with an attorney and an accountant.[1] The guide to what buyers examine and in what order places this review beside the financial, tax and operating workstreams.
Workstreams, records and where a finding lands
Read the last column first. Findings that cost time are cured with paper. Findings that cost money are handled through price, an escrow or an indemnity, as the guide to representations, warranties, indemnification and escrows explains.
| Workstream | What counsel tests | Records requested | Where a finding usually lands |
|---|---|---|---|
| Ownership | Who owns the company and who holds a claim to equity | Formation documents, ownership ledger, owner agreements | Seller cure and releases before signing |
| Contracts | Consent, termination and exclusivity terms a sale triggers | Customer, supplier, financing and lease agreements | Consent as a closing condition; price talks if a key contract is at risk |
| Intellectual property | Who owns marks, software, formulas and domains | Registrations, assignments, licenses | Signed assignment before closing; special indemnity |
| Licenses and permits | Whether each is current and transferable | Licenses, renewals, agency letters | Agency approval as a closing condition |
| Litigation | Pending, threatened and settled matters, and who pays | Pleadings, demand letters, settlements, insurer letters | Specific indemnity or escrow; price deduction |
| Real estate | Right to occupy or own each site | Leases, deeds, title, survey, estoppel certificates | Landlord consent as a closing condition |
| Insurance | Coverage, exclusions and claims history | Policies, loss runs | Tail or replacement coverage |
Illustrative example: How four legal findings are routed
A buyer agrees to a price of $12,000,000. Its counsel finds that a major customer agreement lets the customer terminate on a change of control, that a contractor wrote the core software without signing an assignment, that a customer has a pending claim of $250,000, and that a local license has lapsed.
| Finding | Route | Cash effect at closing |
|---|---|---|
| Customer termination right | Written consent as a closing condition | None if it arrives |
| Software with no assignment | Signed assignment before closing | None, but the seller bears the cost of obtaining it |
| Pending customer claim | Specific indemnity backed by an escrow equal to the claim | $250,000 held back |
| Lapsed license | Renewal filed before signing | None |
The seller receives $11,750,000 at closing, and the $250,000 is released if the claim ends without payment. The customer and the contractor each hold leverage, because the sale cannot close without their signatures, so a seller who asks early pays less than one who asks in the last week. The numbers are invented to show the mechanics and are not benchmarks.
Company ownership and authority to sell
Counsel starts with the formation documents and ownership ledger and reconciles them with every agreement among owners. In a stock sale each seller must deliver clean title to its shares. In an asset sale the company must be authorized to sell, and owners often must approve.
- Equity promised and never papered. A percentage mentioned to an employee, phantom equity, profit interests or options each create a claim on proceeds, so counsel asks for every agreement and a release from each holder.
- Transfer restrictions. Owner agreements often carry rights of first refusal, consent rights, drag-along and tag-along terms and buy-sell provisions that a sale triggers.
- Gaps in the record. Missing minutes, unsigned approvals and undocumented entity changes can often be cured by ratifying resolutions. That costs little before launch and a great deal if a former owner must sign.
Change-of-control and assignment clauses
For each material contract, counsel asks what happens to it when the company is sold. The answer turns on structure and wording. In an asset sale, contracts generally must be assigned to the buyer, so an anti-assignment clause can require the counterparty’s consent. In a stock sale the company remains the contracting party, so a plain assignment clause may not apply, but a clause written to cover a change of control can. The comparison of asset and stock sales explains the structure choice. Counsel flags these terms:
- Consent or notice rights that let a customer, landlord or licensor approve, refuse or use the request to reopen price.
- Termination for convenience, which makes revenue less certain than the contract term suggests.
- Exclusivity, most-favored-pricing and non-compete clauses, which can bind the buyer’s other businesses after closing.
- Take-or-pay and minimum purchase commitments, which the buyer inherits.
- Personal guarantees by the owner on leases, credit lines and supplier accounts, which the buyer will want replaced.
- Handshake terms with long-standing customers, such as pricing promises and rebates. A promise nobody can document is one a buyer cannot price.
The seller’s first job is a schedule of every agreement with a consent, notice or termination trigger, ranked by revenue at stake. The second is timing. Asking a customer for consent before the buyer is committed risks a leak, and asking late risks delay at closing. The guide to telling employees and customers about a sale covers the sequence, and the customer diligence guide shows how buyers weigh the same contracts commercially.
Intellectual property ownership and the paper behind it
Buyers pay for brands, software, formulas and designs only if the company can show it owns them, and ownership rests on documents. The gaps are usually clerical.
- Registrations in the wrong name. A trademark filed by the owner personally, a domain registered by a former web agency, a social account on a personal login.
- Contractor work. A contractor who built software, a logo or a product design may own it unless a signed assignment moved it to the company, so counsel asks who contributed to anything core and for each person’s agreement.
- Employee agreements. Counsel checks that people who create products or code signed agreements covering inventions and confidentiality.
- Work from before the company. Code, recipes or designs the owner created before forming the company may sit with the owner personally.
- Licenses in and out. Whether each license the business depends on survives a sale, and what rights the company has granted to customers or others.
The usual fix is a confirmatory assignment, a short document in which a person transfers whatever rights they hold to the company. It is easiest to obtain before launch, while no closing date waits on the signature. How a particular arrangement is treated is a question for IP counsel.
Permits, litigation, real estate and insurance
Licenses and permits. Counsel lists each license the business needs, confirms it is current and held by the entity being sold, and asks whether it survives a sale, needs notice or must be reissued. The answer depends on the permit’s terms, the structure and the issuing agency, so regulatory counsel asks the agency early. Larger deals raise a separate question of a federal premerger filing. The Hart-Scott-Rodino size-of-transaction threshold is $133.9 million for 2026,[2] and antitrust counsel confirms whether a given deal needs a filing.
Litigation and claims. Counsel asks for every pending, threatened and settled claim, with demand letters and the company’s responses, and searches court dockets, tax and judgment liens and Uniform Commercial Code filings, so a lender’s lien the seller forgot will surface. A claim the seller disclosed with a status summary is a negotiation. One that counsel finds in a docket search is a credibility problem. Employment claims are covered in HR and employment diligence.
Real estate and insurance. For leased sites, counsel reads the assignment terms and asks the landlord for an estoppel certificate confirming that the lease is in effect and no default exists. Owned property adds title, survey and environmental questions, covered in selling a business that owns its real estate and in environmental diligence and Phase I assessments. For insurance, counsel reads the policies and loss runs and asks whether a tail policy is needed for claims arising from the seller’s period of ownership.
A clean-up list for the seller
The seller’s attorney does this work, ordered by what would block closing.
- Ownership. Reconcile the ledger, agreements and approvals, and obtain releases from anyone with a claim to equity or proceeds.
- Contract schedule. List every agreement with a consent, notice or termination trigger, ranked by revenue, with who approaches each counterparty and when.
- Assignments. Collect signed assignments from contractors and employees who built something core, and move marks and domains into the company’s name.
- Permits. List each license with its holder, expiry date and transfer mechanics, and renew any that has lapsed.
- Handshake terms. Put oral arrangements with customers and suppliers in writing.
- Claims log. Summarize each open matter on one page from counsel, with insurer letters attached.
- Sites and guarantees. Gather leases with amendments, list personal guarantees and ask landlords and lenders what a release requires.
The results go into a data room that follows the buyer’s likely request list, as the guide to data room organization describes, and into the disclosure schedules. A gap the buyer finds is a price negotiation. A gap the seller disclosed with its fix is a schedule entry. The key terms of the purchase agreement show where the schedules sit, and the guide to red flags buyers find in diligence shows how legal gaps look beside financial and operating ones. This guide is general education and not legal advice.
Frequently asked questions
What does legal due diligence cover in a business sale?
Buyer counsel reviews ownership and authority to sell, material contracts and their consent and termination terms, intellectual property ownership, licenses and permits, litigation, real estate and insurance. The aim is to confirm that the seller owns what it is selling and to find missing consents, claims or restrictions that need a fix, a closing condition or contractual protection.
What is a change-of-control clause?
It is a contract term that gives the other party a right, such as consent, termination or renegotiation, when ownership of the company changes. Buyer counsel lists every such clause, and the important ones usually become consents required before closing. Whether a clause is triggered depends on its wording and on whether the deal is an asset or a stock sale.
Why do buyers ask contractors and employees for intellectual property assignments?
Software, designs and formulas created by a contractor may belong to the contractor unless a signed document moved ownership to the company. Buyers pay for intellectual property only if the company can show it owns it, so counsel asks for assignments from everyone who built something core. IP counsel confirms how each arrangement is treated.
Does a pending lawsuit stop a business sale?
Not by itself. Buyer counsel sorts claims by whether insurance responds, the realistic exposure and whether the cause is fixed. Open claims are usually handled with a specific indemnity, an escrow or a price deduction, so the sale proceeds. A claim the seller never mentioned, found later in a court records search, damages trust more than the claim does.
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Related guides
- The Purchase Agreement: Key Terms Sellers Should Understand Before Signing: The purchase agreement is the binding contract in a business sale. See its key terms, from price adjustments to indemnification, and the questions to ask counsel.
- Reps and Warranties, Indemnification and Escrows in a Business Sale: A Seller’s Glossary: How reps and warranties, indemnification, baskets, caps, survival periods and escrows work in a business sale, and how a claim moves from notice to payment.
- Customer Due Diligence: Contract Review, Retention Analysis and Customer Calls: How buyers run customer due diligence: contract terms, retention by cohort, pricing history, credits and disputes, and the customer calls that test revenue.
- Due Diligence Checklist for Sellers: What Buyers Ask For and Why: A checklist of the documents and answers buyers request in diligence on a company sale, grouped by area, with the reason each request is made.
- Sell-Side Quality of Earnings Report: Scope, Timing and How to Use It: What a sell-side quality of earnings report covers, when an owner should commission it, who should perform it and how to use it in the CIM and with buyers.
- Quality of Earnings Findings That Reduce Price and How to Pre-Empt Them: The quality of earnings findings that most often lower a sale price, such as rejected add-backs and cut-off errors, with how each appears and how to pre-empt it.
Sources
- Buy an existing business or franchise. U.S. Small Business Administration. Accessed October 13, 2026.
- New HSR thresholds and filing fees for 2026. Federal Trade Commission. Accessed October 13, 2026.
This guide is general education. It is not a valuation opinion, appraisal, investment advice, or legal or tax advice. How these guides are made.