Here is my visa-story: Arrived in Thailand january 1 with 60 day tourist-visa , changed to 90 day non-immigrant visa january 21 valid until april 20 ,did one year retirement extension march 26 valid until april 20 2010.When does my 90 day count start march 26 or april 20? Any help welcome. By the way my impressions about my trip to Thali-Immigration.Since I live near Chaiyaphum its a long and painful (at least for my ass) 9 hour bustrip , but the staff at Thali is very friendly and helpful . As I told them about the duration of my trip and asked them if i could do my 90 day-reports by mail they agreed . Big thumbs up for Thali.

Your 90 day count started on March 26th. The day you went to immigration for an extension is considered the first 90 day report and you have to report every 90 days from that day.

Note that you have a 7 day grace period beofre and after the exact date in which you can make your report.

I agree with wot Mario said.