Four systems, and Tennessee chose the stricter modified version
American fault law splits into four real categories: pure comparative negligence, modified comparative negligence with a 50% bar, modified comparative negligence with a 51% bar, and pure contributory negligence. Tennessee uses the 50% bar — the stricter of the two modified thresholds.
A genuinely deliberate choice, laid out in the opinion itself
The Tennessee Supreme Court's McIntyre v. Balentine opinion explicitly described both modified variants side by side: jurisdictions where a plaintiff recovers as long as their fault "does not exceed" the defendant's (the more forgiving "50 percent" version), and jurisdictions where the plaintiff's fault must be "less than" the defendant's (the stricter "49 percent" version). Tennessee's court deliberately chose the stricter option for the state.
The precise difference, at the exact tie
A claimant found exactly 50% at fault recovers half of their damages under the more forgiving "50 percent" version used elsewhere, because that fault "does not exceed" the defendant's. Under Tennessee's "49 percent rule," that same exact 50-50 split bars recovery entirely, because the plaintiff's fault is not less than the defendant's.
The other two systems, for context
A larger group of states uses the more forgiving 51% bar, where recovery is barred only once a plaintiff's fault actually exceeds 50%. At the more generous end, pure comparative negligence states like California never bar recovery for ordinary fault at all. At the far stricter end, Tennessee's own neighbor North Carolina still follows pure contributory negligence, barring recovery entirely for any fault, even 1%. See our guide to the other states using a 50% bar for Tennessee's closest peer group nationally.