A no-contest clause is designed to deter litigation by threatening a beneficiary who loses a will or trust challenge with forfeiture of whatever they were otherwise entitled to receive. States take meaningfully different approaches to enforcing these clauses: some enforce them strictly, some refuse to enforce them at all as against public policy, and a large number apply a 'probable cause' exception that allows a challenge to proceed without triggering forfeiture if the challenger had a reasonable, good-faith basis for bringing it, regardless of whether the challenge ultimately succeeds.

Even in states that enforce no-contest clauses, certain types of challenges are commonly excluded from triggering forfeiture — actions to construe or clarify ambiguous language, challenges to the document's validity based on forgery or subsequent revocation, and proceedings brought with court approval or the fiduciary's consent are frequently carved out. Because the clause only has teeth against a beneficiary who stands to lose something meaningful under the document, it has little deterrent effect on someone left little or nothing to begin with.

Juricratic models the practical deterrent effect of a no-contest clause as a function of both the applicable state's enforcement posture and the challenger's downside under the document, since the same clause language can carry very different real-world weight depending on that combination — the platform surfaces this as a scenario input rather than assuming uniform enforceability nationwide.

Estate litigators evaluate a no-contest clause before advising a client on whether to file a challenge by determining the governing state's enforcement approach, whether the state recognizes a probable-cause exception, and how much the client stands to lose under the current document if the challenge fails — since in a state with a probable-cause exception and a legitimate claim, the clause may pose little real risk.