Also known as: same transaction or occurrence test · transaction or occurrence · same transaction
Written by attorneys · grounded in primary & secondary sources — see below
A factual or legal connection between claims, writings, or security interests that arise from a common set of events or circumstances. The connection determines whether multiple matters must or may be resolved together in one proceeding or document.
Select any source to read its text and confirm it supports the definition.
Sebastian Santos sues Sterling Dynamics for breach of a supply contract after the company failed to deliver parts on time. Sterling Dynamics possesses a claim that Santos overcharged on an earlier invoice tied to the identical supply arrangement. Because the overcharge claim arises from the same events as the delivery dispute, the company must assert it as a counterclaim or lose it.
Simone Sanders and Skyline Construction sign a base agreement for building renovations followed by a change-order letter that modifies the scope and price. When a dispute arises over the final payment amount, the court reads both documents together because they form part of one coordinated project.
Samantha Stone buys vacant land from a seller and simultaneously borrows from a bank to pay most of the purchase price while using part of the loan for later site work. The bank records its mortgage on the closing date. The mortgage qualifies as a purchase money interest because the funds were advanced as part of the acquisition transaction.
Scott Summers files a federal antitrust claim against Starlight Media arising from a single licensing deal. He also asserts state-law tort claims based on the same negotiations and contract performance. The federal court may hear the state claims because they share the operative facts of the licensing arrangement.
Sierra Santos and Seth Shapiro are codefendants in a negligence action stemming from a joint construction project. Sierra asserts a claim against Seth for contribution based on the identical project facts. The crossclaim is proper because it arises from the same occurrence that gave rise to the original suit.
Sierra Solutions and a buyer exchange an unsigned purchase order and a signed confirmation letter that together describe the identical equipment sale. When the buyer later denies the deal, the two documents are read together as a sufficient memorandum because the circumstances show they concern the same transaction.
A claim arises from the same transaction or occurrence when it shares the operative facts that form the basis of the opposing party's claim. Courts examine logical relationship, overlap in evidence, and whether the claims would ordinarily be tried together. If the test is met, the claim must be asserted or it is barred.
Supporting sources
…as it would be if tried in a State court. The nub of the policy that underlies Erie R. Co. v. Tompkins is that for the same transaction the accident of a suit by a non-resident litigant in a federal court instead of in a State court a block away, should not lead to a substantially different result. And so, putting to one…
…as it would be if tried in a State court. The nub of the policy that underlies Erie R. Co. v. Tompkins is that for the same transaction
…of related claims in a single lawsuit. Rule 13 makes compulsory (upon pain of a bar) all counterclaims arising out of the same transaction or occurrence
…a creditor files a claim, the referee is empowered to hear and decide a counterclaim against that creditor arising out of the
…basic fairness and mutuality if it requires one contracting party, but not the other, to arbitrate all claims arising out of the
Supplemental jurisdiction exists when the federal and state claims derive from a common nucleus of operative fact such that a plaintiff would ordinarily expect to try them in one proceeding. The test is satisfied when the claims arise from the same transaction or occurrence. The court retains discretion to decline jurisdiction even when the standard is met.
Supporting sources
Multiple writings may be read together when one is signed and the circumstances clearly indicate that they relate to the same transaction. Physical connection is unnecessary if the documents address the same deal and the party to be charged has acquiesced in the unsigned writing.
Supporting sources
A mortgage qualifies as a purchase money mortgage when its proceeds are used to acquire title or construct improvements and the mortgage is given as part of the same transaction in which title is acquired. The mortgage receives priority protection to the extent the funds served an acquisition purpose.
Supporting sources
A crossclaim is permitted when it arises out of the transaction or occurrence that is the subject matter of the original action or of a counterclaim. The test focuses on factual overlap and efficiency in resolving related disputes in a single proceeding.
Supporting sources