How to Make a Purchase Agreement That’s Enforceable

To make a purchase agreement enforceable, you need four things in place: an offer and acceptance on the same terms, consideration flowing both ways, parties with the legal capacity to sign, and a lawful purpose. For real estate and for goods priced at $500 or more, the agreement also has to be in writing. The contract doesn’t transfer ownership on its own. What it does is lock both sides into obligations — the seller to sell, the buyer to buy — on the terms the document spells out.

The Four Elements Every Purchase Agreement Needs

Miss any one of these and a court may refuse to enforce the deal, no matter how polished the paperwork looks.

Mutual assent. One side makes an offer, the other accepts it, and both agree on the same essential terms: what’s being sold, the price, and when the deal closes. If the parties are describing different things or different prices, there’s no meeting of the minds and no contract.

Consideration. Each party has to give up something of value. In a typical purchase, the buyer’s payment (or promise to pay) is the consideration for the seller’s promise to deliver. A one-sided promise with nothing bargained for in return is generally unenforceable.1Legal Information Institute. Consideration

Legal capacity. Every signer must be at least 18 and mentally capable of understanding what they’re agreeing to. A contract signed by a minor is usually voidable at the minor’s option, with narrow exceptions for necessities. A contract signed by someone who was intoxicated, under duress, or cognitively impaired can also be voided.

Lawful purpose. The underlying transaction has to be legal. An agreement to sell stolen property or contraband is void from the start.

If all four boxes are checked and any applicable writing requirement is met, the agreement is binding the moment both parties sign.

When It Has to Be in Writing

A doctrine called the statute of frauds forces certain contracts into writing, signed by the party you’d want to enforce it against. Verbal purchase agreements can be valid for small personal-property sales, but these categories must be in writing to hold up:

  • Real estate — sales, leases longer than one year, options to purchase, and mortgages, regardless of dollar amount.
  • Goods priced at $500 or more, under the Uniform Commercial Code.2Legal Information Institute. UCC 2-201 Formal Requirements Statute of Frauds
  • Any contract whose terms make it impossible to complete within 12 months of signing.

Even when writing isn’t legally required, put the terms on paper anyway. Memory fades. People disagree about what was said. A written contract eliminates most of that fight before it starts.

Terms the Document Must Spell Out

Enforceability depends on the agreement being specific enough that both parties — and a judge, if it gets that far — can tell exactly what was promised. Vague or missing terms are where deals come apart. At a minimum, the document needs:

  • Full legal names and addresses of every buyer and seller. For a business entity, use the registered name.
  • A precise description of what’s being sold. For real estate, a legal description (lot and block or metes and bounds), not just a street address. For vehicles, year, make, model, and VIN. For other goods, enough detail to leave no doubt which item is covered.
  • The purchase price and payment terms: total price, method (lump sum, installments, financing), payment schedule, and acceptable forms of payment. If earnest money or a deposit is involved, state the amount and the conditions under which it’s refundable.
  • A closing or delivery date, either specific or calculable from a formula.
  • Representations and warranties — the seller’s factual statements about the property or goods, such as clear ownership, condition, and absence of hidden liens. These give the buyer legal recourse if a statement turns out to be false.
  • Default provisions covering what happens if a party fails to perform: cancellation, deposit forfeiture, damages.
  • Governing law — which state’s law applies, especially when buyer and seller are in different states.

No template fits every transaction. A $2,000 used-car sale needs far less than a commercial real estate deal. But every agreement, large or small, needs the parties, the item, the price, and a closing date clearly stated.

Contingencies and Earnest Money

Contingencies are conditions that must be met before the deal becomes final. If a contingency isn’t satisfied by its deadline, the buyer — and sometimes the seller — can walk away without penalty and usually recover the earnest money. The common ones in real estate:

  • A financing contingency makes the deal dependent on the buyer securing a mortgage commitment by a set date.
  • An inspection contingency gives the buyer a window to inspect the property and renegotiate or back out if serious problems surface.
  • An appraisal contingency requires the property to appraise at or above the purchase price.
  • A title contingency conditions the deal on a clean title search confirming the seller’s ownership and the absence of unexpected liens.

Waiving contingencies to make an offer more competitive is common in hot markets, but the risk is real. Drop the financing contingency and your lender later backs out, and you can lose your entire deposit with no recourse. Every waived contingency moves risk from seller to buyer.

Earnest Money

Earnest money is the buyer’s good-faith deposit, held in escrow until closing. In residential real estate it typically runs 1 to 3 percent of the purchase price, though there’s no legal minimum or maximum. What matters for enforceability is what happens to that money if the deal falls apart. When a buyer backs out under a valid contingency, the deposit usually comes back. When a buyer defaults without a contingency excuse, the seller usually keeps it as liquidated damages, meaning agreed-upon compensation that the seller doesn’t need to prove in court. Spell out these scenarios in the contract itself. Earnest money disputes are among the most common sources of post-contract litigation.

Disclosures the Law Requires

Beyond what you negotiate, federal and state law may require specific disclosures to appear in or alongside the purchase agreement. Skipping them can make the contract voidable or expose the seller to penalties.

Lead-Based Paint

For any home built before 1978, federal law requires the seller, before the buyer signs, to disclose known lead-based paint hazards, share available testing records and reports, provide a pamphlet on lead hazards, and include a Lead Warning Statement in the contract.3Office of the Law Revision Counsel. 42 USC 4852d – Disclosure of Information Concerning Lead Upon Transfer of Residential Property The buyer gets a 10-day window to have the property inspected for lead, though the parties can agree to a different timeframe or the buyer can waive the inspection. Sellers and agents must keep signed copies for three years after the sale.4US EPA. Real Estate Disclosures About Potential Lead Hazards

State Disclosures

Most states layer their own disclosure requirements on top of the federal rule. These commonly cover known structural, roof, plumbing, or electrical defects, environmental hazards like radon, mold, or flood-zone proximity, and other material facts that could affect value. Requirements vary widely, so check your state’s disclosure law or ask a local attorney before finalizing the agreement.

Signing: Capacity, Electronic Signatures, and What Comes After

Before anyone signs, every party should read the whole agreement and understand what they’re committing to. Having an attorney review the draft is worth the cost on any significant transaction. Lawyers catch ambiguous language that reads clearly to non-lawyers, flag missing protections, and identify terms that may not be enforceable in your jurisdiction. Any changes that come out of negotiation have to be documented, either by revising the agreement or through a written amendment signed by all parties.

Capacity deserves a second look at this stage. If you’re buying from or selling to someone whose capacity might be questioned later — an elderly relative in cognitive decline, for example — bring in an attorney. A later challenge that the signer didn’t understand the deal can unwind everything.

Electronic Signatures

You don’t need ink. The federal ESIGN Act provides that a contract or signature cannot be denied legal effect solely because it’s in electronic form.5Office of the Law Revision Counsel. 15 USC 7001 – General Rule of Validity Forty-nine states and the District of Columbia have also adopted the Uniform Electronic Transactions Act, which recognizes electronic signatures attached to a record and executed with intent to sign.

For consumer transactions handled electronically, ESIGN adds requirements. The consumer must affirmatively consent to electronic delivery, and before consenting must receive a clear statement about the right to request paper copies, how to withdraw consent, and the hardware and software needed to access the records.5Office of the Law Revision Counsel. 15 USC 7001 – General Rule of Validity Platforms like DocuSign and HelloSign handle these steps automatically. If you’re managing the process yourself, make sure the consent piece is covered.

After Signing

Distribute copies of the fully executed agreement to every party, including agents, attorneys, and lenders. For real estate, the purchase agreement itself usually isn’t recorded with the county. The deed, executed at closing, is what gets recorded to establish the new owner’s public claim. Keep the signed agreement at least as long as you own the property or goods, and longer if it contains warranties or ongoing obligations.

If Someone Breaches

Enforceability only matters because of the remedies it unlocks. When one party fails to perform, the other has several options depending on the deal and what the contract says.

  • Monetary damages. The non-breaching party sues for the financial loss caused by the breach. In many residential real estate deals, the earnest money serves as pre-agreed liquidated damages, so the seller keeps the deposit rather than going to court to prove actual losses.
  • Specific performance. A court order forcing the breaching party to complete the deal. This is most common in real estate, because every property is unique and money alone can’t substitute for the specific house or lot the buyer contracted for. A buyer seeking it typically must show the contract is valid, they were ready and able to close, the seller refused without justification, and money damages would be inadequate.
  • Rescission. The contract is unwound, both sides return what they received, and the parties go back to square one. This is the usual outcome when a contingency fails or when one side made a material misrepresentation.

Liquidated damages clauses are enforceable only if the amount is a reasonable estimate of actual harm. Courts throw out clauses that function as penalties. If your agreement sets a liquidated damages figure, it needs to bear some relationship to likely losses, not just a number meant to punish.

Tax Reporting Triggered by the Sale

Signing the agreement can trigger federal reporting obligations that catch people off guard.

Any business that receives more than $10,000 in cash in a single transaction, or a series of related transactions, must file IRS Form 8300 within 15 days of receiving the payment.6Internal Revenue Service. Form 8300 and Reporting Cash Payments of Over $10,000 The business must also send a written notice to the payer by January 31 of the following year and keep copies for five years. This hits car dealerships, jewelers, boat sellers, and anyone else handling large cash sales.

Most real estate closings require the settlement agent, closing attorney, or other person responsible for closing to file Form 1099-S with the IRS reporting gross proceeds.7Internal Revenue Service. Instructions for Form 1099-S No form is required when total consideration is under $600, or when the seller qualifies for the principal-residence capital gains exclusion and provides a signed certification. If you’re selling property, your closing agent will usually handle this, but confirm it. The obligation falls on whoever is responsible for closing the transaction.