Four systems, not two
Most explanations of fault law boil it down to "comparative vs. contributory," but there are really four distinct systems in use across the United States, and Alabama's rule sits at the strictest end of that spectrum.
Pure comparative negligence
In a pure comparative negligence state, an injured person can recover damages even if they were found to be mostly at fault — up to 99%. Their recovery is simply reduced by their own percentage of fault. A plaintiff with $100,000 in damages who's found 40% at fault would still recover $60,000. Nothing about the plaintiff's own degree of fault, however large, eliminates the claim outright.
Modified comparative negligence (50% bar)
A middle-ground system: an injured person can recover, reduced by their percentage of fault, as long as they're found to be less than 50% at fault. Once their fault reaches 50% or more, recovery is barred entirely. A plaintiff found exactly 50% at fault recovers nothing under this version.
Modified comparative negligence (51% bar)
A close variant of the above, using a slightly more forgiving threshold: recovery is barred only once the plaintiff's fault reaches 51% or more. A plaintiff found exactly 50% at fault can still recover under this version, just reduced by that 50%.
Pure contributory negligence — Alabama's rule
This is where Alabama sits, along with only four other American jurisdictions. There's no threshold, no percentage cutoff, and no partial reduction that still leaves something on the table. Under pure contributory negligence, any degree of fault on the injured person's part — even 1% — can completely bar recovery, no matter how much more at fault the other party was. A plaintiff with $100,000 in damages found just 5% at fault recovers nothing, the exact same outcome as a plaintiff found 95% at fault. See our guide to the 5 states that still use this rule for the fuller picture of why Alabama and only four others have kept it.
Why this genuinely matters in practice
The practical stakes of a disputed fault question are dramatically different depending on which of these four systems applies. In a pure comparative negligence state, arguing over whether a plaintiff was 20% or 30% at fault changes the final number, but the claim survives either way. In Alabama, that same argument can be the entire case — the difference between full recovery and nothing at all. This is exactly why fault disputes get contested so aggressively in contributory negligence states specifically.