Disagreeing with what a will says isn’t grounds for a will contest Arizona courts will consider. A contestant has to prove one of a specific, limited set of legal defects. The will simply distributing property in a way someone finds unfair changes nothing. Under A.R.S. § 14-3407, the person challenging a will carries the burden of proving lack of testamentary capacity, undue influence, fraud, duress, mistake, or revocation. That burden sits with the contestant from the start, not with the person defending the will.
Will contest Arizona: lack of testamentary capacity
To have testamentary capacity, a person signing a will has to generally understand what they own. They also have to recognize their close family members and understand that they’re creating a document that distributes their property at death. A contestant doesn’t have to prove the testator was incompetent in every area of life. They only have to prove the testator lacked capacity specifically at the moment the will was signed. Medical records, witness testimony from the signing, and the testator’s behavior around that date typically carry the most weight.
Will contest Arizona: undue influence
Undue influence claims are usually the hardest to prove directly, since the pressure typically happens in private. Arizona law makes this easier in specific circumstances. Under A.R.S. § 14-2712, a will is presumed to be the product of undue influence if someone in a confidential relationship with the testator was actively involved in preparing the will and is also its principal beneficiary. When that presumption applies, the burden actually shifts. The person defending the will then has to prove by a preponderance of the evidence that no undue influence occurred.
Will contest Arizona: fraud, duress, and mistake
Fraud covers situations where the testator was deceived about a material fact that shaped how they wrote the will. Being told a child had died, for example, when that wasn’t true. Duress covers a will signed under threat or coercion. Mistake covers cases where the will doesn’t reflect what the testator actually intended because of an error in drafting or execution. Each of these requires specific proof tied to the will’s creation, not just suspicious circumstances after the fact.
The deadline that ends most challenges before they start
Arizona imposes a strict filing deadline on will contests. Missing it typically ends the challenge regardless of how strong the underlying claim might have been. Interested parties who suspect a problem with a will need to act quickly once they learn probate has begun. Waiting to gather more evidence can cost the right to challenge the will at all.
The bottom line
A successful will contest Arizona courts will grant requires more than a family member’s belief that a will “doesn’t seem right.” It requires evidence tied to one of the statute’s specific grounds, gathered and filed within a limited window. The presumption-shifting rule around confidential relationships and principal beneficiaries is the one meaningful exception that can ease a contestant’s burden. Outside of that narrow circumstance, the person challenging the will carries the weight of proof from the very first filing. That same evidentiary rigor is part of why probate as a whole tends to run on a court timeline rather than a family’s timeline — a contested will simply adds another layer to a process that already moves deliberately.
Frequently asked questions
No. Arizona requires proof of a specific legal defect, such as lack of capacity, undue influence, fraud, duress, or mistake. A will simply distributing property in an unequal way isn’t grounds for a contest.
The person contesting the will generally carries the burden of proof, not the person defending it, except in the specific undue-influence presumption scenario where the burden shifts to the will’s defender.
When someone in a confidential relationship with the testator was actively involved in preparing the will and is also its principal beneficiary, the law presumes undue influence and shifts the burden to that person.
Yes. Arizona imposes a strict filing deadline, and missing it typically ends the challenge regardless of how strong the underlying claim might have been.
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Get MatchedKeep reading: Revocable living trusts, which carry a related but separate set of rules for challenging validity, and beneficiary designations, which typically bypass a will contest entirely, are covered in upcoming guides in this series. For how the underlying probate process works, see Arizona Probate Process.
This article is for general informational purposes only and does not constitute legal advice. Will contests involve strict filing deadlines and evidentiary requirements — consider speaking with a licensed Arizona probate litigation attorney promptly if you believe a will is invalid.