The wording difference between "material portions" and "material provisions" is small on the page and is the sort of difference litigation is made of. Neither statute defines the phrase further, and neither should be read as though the other's word were interchangeable with it. What both are doing is the same job: separating the parts of the document that carry the testator's dispositive intent from the parts that do not, so that a heading, a date stamp or a printed line does not defeat the whole page. Utah adds a provision that makes the direction of travel clear. Its section 75-2-502(3) allows intent to be established by extrinsic evidence "including, for holographic wills, portions of the document that are not in the testator's handwriting," so the non-handwritten parts are evidence rather than contamination.
California takes that further, and its subsection (c) is the provision most likely to describe a reader's actual situation: "Any statement of testamentary intent contained in a holographic will may be set forth either in the testator's own handwriting or as part of a commercially printed form will." That is the store-bought form, filled in by hand, with the printed boilerplate left as printed. It is exactly the document people produce when they decide to handle this themselves, and California's rule means the printed words do not by themselves sink it.
Dating is where a handwritten will differs most sharply from a witnessed one, and the difference is easy to miss because a date feels like a formality. California's section 6111(b) supplies two rules for a holograph that carries no date. First, if the omission "results in doubt as to whether its provisions or the inconsistent provisions of another will are controlling, the holographic will is invalid to the extent of the inconsistency unless the time of its execution is established to be after the date of execution of the other will." Second, "if it is established that the testator lacked testamentary capacity at any time during which the will might have been executed, the will is invalid unless it is established that it was executed at a time when the testator had testamentary capacity."
Read that second rule against how capacity is normally litigated. Capacity is measured at the moment of signing, which is ordinarily a narrow and answerable question. On an undated holograph it becomes a question about an entire period, and the burden of rescuing the will falls on the person proposing it. A testator with a fluctuating condition who writes an undated page has created the one document where a capacity challenge is easiest to bring and hardest to answer.
Harmless error is a separate route and should not be confused with the holographic rule. California's section 6110(c)(2) treats a will that was not witnessed as required as though it had been, "if the proponent of the will establishes by clear and convincing evidence that, at the time the testator signed the will, the testator intended the will to constitute the testator's will." Utah's section 75-2-503 goes wider, reaching a document intended as a will, as a partial or complete revocation, as an addition to or alteration of a will, or as a revival of a revoked one. And Minnesota, which has no holographic provision at all, enacted that same wide form at section 524.2-503 for documents executed on or after 13 March 2020, so an unwitnessed handwritten page is not simply void there. Harmless error is not the holographic rule under another name, though: it turns on proving intent by clear and convincing evidence, in a proceeding somebody has to pay for, rather than on a document being good on its face. It is a safety net, not a plan.
What a handwritten will costs, set against what it saves. It saves the cost and the delay of having a document prepared and witnessed, which is a real consideration in an urgent situation and is why the form has survived. What it gives up is everything that makes a will easy to prove. There are no witnesses to testify and no self-proving affidavit, so the will has to be proved another way and the burden is on whoever offers it. There is no drafter to say what the testator understood. The language is usually imprecise about the residue, about what happens if a beneficiary dies first, and about who administers the estate, so the document may dispose of the named items and leave a court to allocate everything else.
What it does not give up, contrary to the usual warning, is portability. Each of the three states read here carries a separate choice-of-law section on execution, and all three are worded alike. Minnesota's 524.2-506, California's 6113 and Utah's 75-2-506 each treat a will as validly executed if its execution complied with the law of the place where it was executed, or with the law of the place where the testator was domiciled, had a place of abode or was a national, either at execution or at death. So a holograph properly made in Utah does not stop being a will because the writer later moved to Minnesota and died there. The exposure runs the other way: the page has to have been good under some state's law at the outset, and a page written and signed by a lifelong resident of a state with no holographic provision leaves the choice-of-law section nothing to work with, whatever the harmless-error route may separately offer. Nor does every state necessarily word its choice-of-law section the way these three do, so it is one more provision to read rather than to assume.