From the TTC website, at this
link:
Important information for PRESTO card customers
Starting July 29, PRESTO card customers will be able to use their PRESTO card to pay their MiWay fare on TTC buses that travel to and from Mississauga.
- You will simply tap your PRESTO card when you board the bus in Mississauga and your MiWay fare will be deducted.
- When you arrive in Toronto, tap before you exit the bus to pay your TTC fare.
Starting August 26, PRESTO card customers will be able to use their PRESTO card to pay their YRT fare on TTC buses that travel to and from York Region.
- You will simply tap your PRESTO card when you board the bus in York Region and your YRT fare will be deducted.
- When you arrive in Toronto, tap before you exit the bus to pay your TTC fare.
Until these changes are introduced you must pay your YRT and/or MiWay fare as you do today (TTC fare plus a supplement, cash or YRT and/or MiWay fare product). The same applies for the reverse. When you board a TTC bus in York Region or Mississauga you must deposit your YRT and/or MiWay fare or cash in the fare box. If you want to pay your TTC fare by PRESTO, you must tap your card when you leave the bus in Toronto.