Passing touchdowns are the real fantasy differentiator at quarterback. Every touchdown is worth four fantasy points in standard scoring, and some leagues boost that to six points. A 35-TD season pays roughly 140 fantasy points on touchdowns alone — enough to separate the QB1 tier from the QB2 tier even when yardage totals look similar. The gap between the top passing TD producer and the tenth-best QB in any given year is typically the single biggest fantasy gap at the position.
The passing TD leaderboard is driven almost entirely by red zone opportunity. Quarterbacks on offenses that consistently reach the opponent's 20-yard line, and that pass on those red zone trips rather than handing off to their running back, lead this category year after year. A team that scores a lot of touchdowns but runs them all in from the goal line will not produce a top passing TD season, no matter how good the quarterback is.
When you are reading the passing TD leaderboard for fantasy draft purposes, pair it with the passing yards leaderboard. A quarterback near the top of both is a legitimate elite fantasy option. A quarterback with high yardage but average TD totals is ripe for positive touchdown regression next year. A quarterback with high TDs but mediocre yardage is the opposite — almost certainly due to cool off. That regression framing is the highest-leverage reason to study these leaderboards together rather than in isolation.