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Contract Law

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Contract law governs agreements between people or businesses and determines when a promise is legally enforceable. Contracts are at the center of everyday life and commerce — from employment and leases to sales, services, and complex business deals — making this one of the most widely applicable areas of law.

A contract generally arises when one party makes an offer, another accepts it, and the parties exchange something of value. Many contracts can be oral, though some types must be in writing to be enforceable, and written agreements are usually clearer and easier to prove. Contract law also addresses what the terms of an agreement mean, what each party is required to do, and what happens when something goes wrong.

When one side does not live up to its obligations — known as a breach — the law provides remedies, most often compensation intended to put the harmed party in the position it would have been in had the contract been performed. In some situations, other remedies may apply. Contract law also recognizes defenses, such as situations where an agreement was based on fraud, was entered into improperly, or is otherwise unenforceable.

For a non-lawyer, the key takeaways are that the written words of an agreement matter a great deal, and that clarity helps prevent disputes. People commonly consult a lawyer before signing significant contracts, when negotiating important terms, or when a dispute arises over whether an agreement was broken.

Share of classified federal decisions

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share of classified federal decisions

Of the federal decisions we've classified by topic, the share each year that fall under this practice area — so a persistently high line means this is a large, enduring share of federal litigation. This is not a share of all litigation: only part of the corpus is topic-classified (unevenly across eras), and an opinion can belong to several areas, so areas need not sum to 100%. State cases are largely unclassified, so this is federal only. The dip in the last several years is a data-coverage gap — our corpus holds fewer opinions from the most recent years — not a real decline.

Circuit splits in contract

Legal questions the federal courts of appeals are divided on — each links to the cases creating the split.

From the OpenJurist Bookshop

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Related practice areas

Agriculture LawBanking and Finance LawBusiness OrganizationsCannabis LawCommunications and Media LawData Privacy and Cybersecurity LawEmployee Benefits and ERISA LawEnergy and Natural Resources Law

Key definitions

Defined terms that recur in contract law — each links to its dictionary entry.

ContractConsiderationBreach of ContractBreachOfferAcceptanceDamagesPerformanceRescissionWarrantyIndemnityEstoppel

Frequently asked questions

Contract Law by state

Courts, law libraries and state-specific resources. State law governs much of this area, so deadlines and rules vary by state.

Further reading

  • LOMBARD STREET - Revised and Updated New Edition, Includes The 1844 Bank Charter Act - Paperback
    LOMBARD STREET - Revised and Updated New Edition, Includes The 1844 Bank Charter Act - Paperback
    Walter Bagehot
  • The Law Relating To Covenants Running With Land (1907) - Paperback
    The Law Relating To Covenants Running With Land (1907) - Paperback
    Richard Cuthbert Brown
  • A Selection of Cases on the law of Contracts: With a Summary of the Topics Covered by the Cases - Hardcover
    A Selection of Cases on the law of Contracts: With a Summary of the Topics Covered by the Cases - Hardcover
    Samuel Williston
  • The Sanctity of Law Wherein Does It Consist? - Paperback
    The Sanctity of Law Wherein Does It Consist? - Paperback
    John W. Burgess
  • The Maine Law In The Balance: Or An Inquiry Into The Theory And Working Capacities Of That Measure (1855) - Paperback
    The Maine Law In The Balance: Or An Inquiry Into The Theory And Working Capacities Of That Measure (1855) - Paperback
    A Citizen of Maine
  • Form and Substance in the Law of Obligations - Paperback
    Form and Substance in the Law of Obligations - Paperback
  • Principles Of The Law Of Damages (1910) - Paperback
    Principles Of The Law Of Damages (1910) - Paperback
    Hugh Evander Willis
  • The Local Taxes Of The United Kingdom: Containing A Digest Of The Law (1846) - Paperback
    The Local Taxes Of The United Kingdom: Containing A Digest Of The Law (1846) - Paperback
    Great Britain Poor Law Commissioners
  • Integrity Risks and Red Flags in Energy Projects - Paperback
    Integrity Risks and Red Flags in Energy Projects - Paperback
    Asian Development Bank
  • Quit Getting Screwed: Understanding and Negotiating the Subcontract - Paperback
    Quit Getting Screwed: Understanding and Negotiating the Subcontract - Paperback
    Karalynn Cromeens
  • Athletes Making Moves: Secure the Future by Protecting Your Name, Image, and Likeness - Hardcover
    Athletes Making Moves: Secure the Future by Protecting Your Name, Image, and Likeness - Hardcover
    Sivonnia Debarros
  • A View Of The Present State Of The Salmon And Channel-Fisheries: And Of The Statute Laws By Which They Are Regulated (1824) - Paperback
    A View Of The Present State Of The Salmon And Channel-Fisheries: And Of The Statute Laws By Which They Are Regulated (1824) - Paperback
    James Cornish
  • Code v. Code: The Street Code Versus the Legal Code: Rethinking Your Business Transactions - Paperback
    Code v. Code: The Street Code Versus the Legal Code: Rethinking Your Business Transactions - Paperback
    Ellakisha Mba Jd O'Kelley
  • The Whole Law Relating To Innkeepers, Licensed Victuallers, And Other License Holders: Being A Complete Practical Treatise On The Innkeeper's Liabilit - Paperback
    The Whole Law Relating To Innkeepers, Licensed Victuallers, And Other License Holders: Being A Complete Practical Treatise On The Innkeeper's Liabilit - Paperback
    Charles Henry Marriott Wharton
  • Contracts Explained - Paperback
    Contracts Explained - Paperback
    Stuart Hill
  • The Merchants' Law Book: Being A Treatise On The Law (1831) - Paperback
    The Merchants' Law Book: Being A Treatise On The Law (1831) - Paperback
    William Grimshaw
  • Hearings Before A Subcommittee Of The Committee On Finance Of The United States Senate In Relation To The Customs Administrative Laws (1898) - Paperback
    Hearings Before A Subcommittee Of The Committee On Finance Of The United States Senate In Relation To The Customs Administrative Laws (1898) - Paperback
    Subcommittee of Committee on Finance
  • Revise SQE Contract Law 2025-26 - Paperback
    Revise SQE Contract Law 2025-26 - Paperback
    Michael Pugh
  • An Abridgment Of Cases Upon Poor Law V4 (1864) - Paperback
    An Abridgment Of Cases Upon Poor Law V4 (1864) - Paperback
  • Law School Study Guides: Contracts I Outline - Paperback
    Law School Study Guides: Contracts I Outline - Paperback
    Legal Success
  • Twelve Years In The Saddle: For Law And Order On The Frontiers Of Texas (1909) - Hardcover
    Twelve Years In The Saddle: For Law And Order On The Frontiers Of Texas (1909) - Hardcover
    W. John L. Sullivan
  • Contracts - Paperback
    Contracts - Paperback
    Randy E. Barnett
  • The Principles Of Mercantile Law (1884) - Paperback
    The Principles Of Mercantile Law (1884) - Paperback
    Joshua Slater
  • Defences in Unjust Enrichment - Paperback
    Defences in Unjust Enrichment - Paperback

This overview is general legal information, not legal advice, and does not create an attorney–client relationship. Laws vary by state and change over time — consult a licensed attorney about your situation.