Mary-Margaret McMahon has cast 110 recorded division votes in the current parliament, voting yea on 40 (36%) and nay on 59 (54%). McMahon was absent for 11 votes (10% of all divisions). McMahon voted with the winning majority 19% 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 110 votes, 67 were on bills and 32 were procedural motions. Opposition members typically show lower majority-alignment rates, as they vote against government bills.