How to Write a Purchase Agreement
Written by Law on Call Staff |Reviewed by Nathan Askins, Esq.|Last Updated March 13, 2026
A purchase agreement is a legally binding contract between a buyer and seller that outlines what’s being sold, the price, payment terms, and each party’s responsibilities. Poor drafting can lead to disputes or failed deals.
Whether buying real estate, a business, or valuable goods, a clear agreement protects both sides. Here’s how to make it legally enforceable.
Main Takeaways
- A purchase agreement defines the price, terms, and responsibilities of both buyer and seller before a sale is finalized.
- A strong purchase agreement explains what is being sold, when payment and delivery occur, and what happens if either party breaks the deal.
- Clear drafting, proper disclosures, and early legal guidance help prevent disputes and protect both parties in major transactions.
What are Purchase Agreements Used For?
A purchase agreement is usually used to buy high-value or legally significant items where clear terms are needed around the price and responsibilities. Common examples include:
- Real estate: houses, land, commercial property
- Businesses: entire companies or shares
- Valuable goods: equipment, vehicles, art, electronics
- Intellectual property: patents, trademarks, copyrights, or trade secrets
Why Use a Purchase Agreement?
A purchase agreement provides clarity, legal protection, and peace of mind for everyone involved in a big-ticket transaction. By putting important terms in writing, it protects both buyer and seller, reduces the risk of misunderstandings, and helps prevent disputes after the transaction is completed.
When Is a Purchase Agreement Legally Binding?
A purchase agreement becomes a legally binding contract when both the buyer and seller agree to the terms and sign it. There must be a clear offer, an acceptance of that offer, and something of value exchanged, like money for property or assets. The agreement also has to follow state and federal laws to be enforceable.
In many cases, certain conditions must be met before the contract is final. These can include things like loan approval, inspections, or appraisals. Once these requirements are completed and the agreement is signed, both parties are legally required to follow the terms of the contract.
Key Elements of a Purchase Agreement
Getting the key parts of a purchase agreement right is essential. It ensures the contract holds up legally and helps prevent loopholes that could end up costing the buyer or seller down the road.
What goes into a purchase agreement?
Here are common elements of purchase agreements:
- Promises and Protections: Assurances that the information provided is accurate and steps to protect both parties if problems come up later.
- Names and Signatures: The full legal names of the buyer and seller, plus their signatures to make the agreement official.
- Price and Payment Details: The total price, payment method, closing date, and if earnest money is required (Earnest money is a deposit that shows a buyer is serious about a purchase. If a deal falls through, the agreement’s terms will determine whether it can be recouped.)
- Transfer of Ownership: A statement that the property or assets are being transferred free of debts or legal claims.
- Non-Compete Terms: Rules that prevent the seller from starting a competing business or taking customers or employees after the sale.
- Financing Information: Details about loans or seller financing used to complete the purchase.
- Promises and Protections: Assurances that the information provided is accurate and steps to protect both parties if problems come up later.
Know what you’re agreeing to before you sign.
How to Write a Purchase Agreement
Writing a clear purchase agreement helps prevent problems and protects both the buyer and the seller. Here’s how to do it.
Step-by-Step Instructions
These steps will help you write a simple purchase agreement that covers the key details of the sale.
1. List the Buyer and Seller
Start by writing the full legal names of the buyer and the seller. Include their addresses and contact information. Make sure the names are correct and match official records.
2. Identify What Is Being Sold
Clearly describe what the buyer is purchasing. This could include equipment, inventory, property, customer lists, or ownership in a company. Be specific so there is no confusion about what is included in the sale.
3. Include the Purchase Price
Write the total price the buyer will pay. Then explain how it will be paid. Will it be one full payment, monthly payments, or financing? Include payment dates and any interest that may apply.
4. Add Promises From Both Sides
Include basic promises from the buyer and seller. For example, the seller may promise that they legally own the business and that the financial records are accurate. These promises help protect both sides.
5. Allow Time for Review
Give the buyer time to review important documents, like financial records and contracts. This is called due diligence. If the buyer finds serious problems, the agreement should explain what happens next.
6. Include Non-Compete and Confidentiality Terms
The agreement may say the seller cannot start a competing business for a certain time. It can also require both sides to keep private information confidential.
7. Explain What Must Happen Before Closing
List any steps that must be completed before the sale is final. This could include getting approval from a landlord, a bank, or a government agency.
8. Describe What Happens After Closing
State what support the seller will provide after the sale, such as training or help transferring accounts. Also explain who is responsible for unpaid bills or taxes.
9. Explain How Disputes Will Be Handled
Include a section that explains how disagreements will be resolved. This might involve mediation, arbitration, or going to court.
10. Sign and Date the Agreement
Both parties should review the agreement carefully before signing. It’s a good idea to have a lawyer look it over to make sure everything is clear and fair.
Common Issues with Purchase Agreements
Purchase agreements can be complex, and even small mistakes or unclear terms can lead to costly disputes between buyers and sellers.
Not Performing Due Diligence
Failing to fully review financial records, contracts, and legal risks can lead to costly surprises after closing.
Overly Vague Language
Whether for real estate, a business, or another asset, if a purchase agreement doesn’t clearly spell out key terms, you might find it difficult to recoup damages if things turn sour.
In Schnackenberg v. Toll Brothers Mortgage Company, the court found that unclear contract terms made it difficult for the plaintiff to prove a specific obligation was violated. Vague language can make enforcing your rights or recovering damages much harder.
No Non-Compete or Restrictive Clauses
When you buy a business, you’re buying its name, and also its customers and reputation. If the purchase agreement doesn’t clearly restrict the seller from competing, they could open a similar business, contact former customers, or poach your employees, which could make it harder for you to succeed in your new business.
Unclear Payment or Financial Terms
Ambiguous payment schedules or financing details can create misunderstandings and cash flow issues.
Frequently Asked Questions
A Purchase Agreement explains what someone plans to buy or sell, how much it will cost, and the rules everyone agrees to follow before the sale is finished. A Contract of Sale means the deal is done and ownership has officially changed from the seller to the buyer.
Yes, but changes typically must be agreed to in writing by all parties, as well as signed and dated, in order to be valid.
In general, purchase agreements can be long, and hard to understand, and because they deal often times with quite large chunk of money, scary to write on your own. Depending on your needs, it can be a good idea to hire a lawyer to both craft the purchase agreement and walk the buyer and seller through the process.