This article is about medical malpractice, but it applies to legal malpractice. Examples?  When is a tax legal malpratice case complete?  is it on the day of the mistake, on the day of the filing, on the last date which a return may be filed, or when the IRS determines there was a mistake?

"Duty, breach, causation and injury: These are the traditional elements of a tort claim. Thus, under customary theories, a tort is inchoate unless and until the plaintiff suffers actual injury. For example, a plaintiff who has an increased risk of disease because she has been exposed to a defective product, but no manifest illness, would have no cause of action. Faced with this quandary, plaintiffs have resorted to novel claims and theories. They have argued, for instance, that recovery should be allowed for increased risk of future disease or for emotional distress"