The Cowboys' most-capped player went to the sin bin in Sunday's 38-20 loss to the Warriors for up-ending Charnze Nicoll-Klokstad during the second half.
Cowboys coach Todd Payten said he "can't disagree" with the decision to sin-bin Taumalolo, who faced a nervous wait for Monday's judiciary charge sheet.
A grade-two charge would have meant a two-game ban, leaving Taumalolo to celebrate his coveted milestone away from home against the Dolphins in round 20.
But the 33-year-old has received a grade-one dangerous throw charge so can accept a $750 fine with an early guilty plea.
It means he's set to play his 300th NRL game in front of home fans against the ladder-leading Panthers on Saturday night.
Taumalolo's clean recent record played into his hand, and earned him a $250 discount on his fine.
A grade-one dangerous throw charge can carry a two-match ban as a third offence, but Taumalolo had not been charged at all since the 2022 finals series.
Warriors forward Erin Clark can accept a $1000 fine for a shot on Heilum Luki in the same game.
Canberra's Morgan Smithies was also fined $1000 for dangerous contact on Melbourne captain Harry Grant in the Raiders' 42-20 loss on Sunday.
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