Mary-Margaret McMahon has cast 76 recorded division votes in the current parliament, voting yea on 27 (36%) and nay on 43 (57%). McMahon was absent for 6 votes (8% of all divisions). McMahon voted with the winning majority 18% of the time.

In the February 2025 election, McMahon won Beaches—East York with 51.17% of the vote, a safe margin of +28.2% over Kate Dupuis (NDP, 22.94%). Turnout in the riding was 49.97%.

Of the 76 votes, 45 were on bills and 25 were procedural motions. Opposition members typically show lower majority-alignment rates, as they vote against government bills.