In an Arizona divorce, a decree mistakenly listed a $200,000 loan from the wife’s father as just $100,000. Her lawyer then missed a deadline to correct the error, but the Arizona Court of Appeals, Division One, rejected her legal malpractice case because she could not prove she suffered an actual loss as a result. The unpublished decision, Mikalacki v. Mihalovich, was issued in 2026 and is available through Justia U.S. Law.The case turns on a basic but often misunderstood principle of legal malpractice law. A client must show not only that the lawyer made a mistake, but that the mistake caused a real, measurable loss. In this case, the court found that the wife had not established that the missing $100,000 would have changed the outcome of her divorce.
What happened in the divorce
The wife, Mikalacki, was involved in a divorce where a $200,000 loan from her father was incorrectly listed in the decree as $100,000. The error was not caught in time, and her lawyer missed the deadline to correct it.That kind of mistake can feel devastating, especially when it involves a large sum of money. But the court’s analysis focused on whether the error actually caused her to lose something she would otherwise have received.The appellate court found that she had not proven that the missing $100,000 would have made a difference in the final division of assets. Without that showing, the malpractice claim could not stand.
Why the malpractice claim failed
To win a legal malpractice case in Arizona, a plaintiff must show four things: the existence of an attorney-client relationship, the attorney’s failure to exercise the ordinary standard of care, that the failure was the proximate cause of actual damages, and that the damages were real and measurable.The court found that Mikalacki failed on the causation and damages prongs. She did not show that the lawyer’s missed deadline was the proximate cause of any actual loss, nor did she establish that she suffered measurable damages as a result.This is a common trap in malpractice cases. A client may feel wronged by a mistake made by a lawyer, but feeling wronged is not the same as proving a financial loss. The court requires evidence that the mistake changed the outcome in a way that cost the client money or property.
Court’s finding on causation
The appellate court emphasised that the wife had to show a link between the attorney’s mistake and her alleged loss. She argued that the missed deadline prevented her from correcting the decree, but the court found that she did not establish that correcting it would have changed the final result.In other words, even if the decree had listed the loan correctly, the court found no evidence that the overall property division would have been different. That is the key question in malpractice cases involving missed deadlines or clerical errors.The court’s reasoning reflects a broader principle in tort law. The plaintiff must prove that the defendant’s breach of duty was the actual and proximate cause of the harm. Without that link, there is no basis for recovery.
What the court said about damages
The court also found that Mikalacki did not establish measurable damages. She did not give evidence that the missing $100,000 amounted to some sort of financial loss that she could put a number on. This is where many malpractice cases fall apart. Even if a lawyer makes a clear mistake, the client must show that the mistake cost them something concrete. In this case, the court found no such showing.The decision is unpublished, which means it does not set binding precedent in Arizona. But it still offers a useful window into how the court approaches malpractice claims involving missed deadlines and clerical errors.
Why the case matters
For anyone considering a malpractice claim, the lesson is clear. A mistake by a lawyer is not enough. The client must show that the mistake caused a real, measurable loss. Here, the wife argued the missed deadline kept her from correcting a $100,000 mistake in the decree. But the court found she did not prove that correcting it would have changed the outcome.That distinction is important. A client may feel that a lawyer’s error was serious, but the court requires evidence that the error actually cost them money or property. Without that, the claim fails.
The broader lesson
The case is a reminder that legal malpractice is not just about whether a lawyer made a mistake. It is about whether that mistake caused a real, measurable loss. Bottom line to customers: Document everything, and move quickly if you find a mistake. For lawyers, it is a reminder that deadlines matter and that even small mistakes can have big consequences.In this case, the court determined the wife failed to meet her burden of proof on causation and damages. The malpractice claim was rejected, and the case serves as a useful example of how courts approach these issues.