When does my one year stay on a NON-O retirement visa start and when should I renew it?

Make sure you write the visa number on the the TM6 arrival card. And point it out to the IO.

Congratulations (y)

When you enter thailand and stamp in make SURE they stamped you in for a year from the date you enter. Many times people get stamped in wrong..

The 1 year validity of the visa starts the day it was issued, your 1 year stay in Thailand starts the day you enter the country

Depending on where you stay you have to report yourself within 24 hours if you stay at a private address. If you stay longer than 90 days inside the country, counted as day of arrival as day 1, you need to report yourself at Immigration Office.

The validity of the visa started when they put it in your passport. When you enter Thailand you will get 1 year Admitted to Stay stamped in your passport, please check if this is correct, sometimes Immigration Officers do make mistakes and direct change is easy. You can leave and come back when ever your want till 1 July 2019, on each entry 1 year Admitted to Stay. If you enter Thailand just before or on 1 July 2019 you have nearly 2 years of stay out of this visa. Be aware that after 1 July 2019 you need a Re-Entry Permit to leave and come back.