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The statute of limitations
for legal malpractice is one year from the time the cause of action accrues. See: Tenn. Code Ann. § 28-3-104(a)(2). When your of action accrues is determined by applying the discovery rule. Under the discovery rule, a cause of action accrues when the plaintiff knows or in the exercise of reasonable care and diligence should know that an injury has been sustained as a result of wrongful or tortious conduct by the defendant. See: Shadrick v. Coker, 963 S.W.2d 726, 733 (Tenn. 1998).
In legal malpractice cases, the discovery rule is composed of two distinct elements: (1) the plaintiff must suffer legally cognizable damage - an actual injury - as a result of the defendant's wrongful or negligent conduct, and (2) the plaintiff must have known or in the exercise of reasonable diligence should have known that this injury was caused by the defendant's wrongful or negligent conduct. See: Carvell v. Bottoms, 900 S.W.2d 23, 28-30 (Tenn. 1995).
The statute of limitations begins to run when the plaintiff has actual knowledge of the injury as where, for example, the defendant admits to having committed malpractice or the plaintiff is informed by another attorney of the malpractice. Under the theory of constructive knowledge, however, the statute may begin to run at an earlier date - whenever the plaintiff becomes aware or reasonably should have become aware of facts sufficient to put a reasonable person on notice that an injury has been sustained as a result of the defendant's negligent or wrongful conduct. See: Carvell v. Bottoms, 900 S.W.2d 23, 28-30 (Tenn. 1995).
So, if you only just now reasonably discovered the malpractice, then the statute runs from that date.