tax statements as proof . .that answers the question, doesn't it?

I wonder how the Thai embassies or consulates treat self employed folks who like to do a sabbatical and have no proof of any employment or holiday period given from an employer . . does that mean they cannot apply for a multi entry tourist visa ?

corrected already (I deleted my comment)

alright, this clears the matter. He will have to do 90-day reports on Immigration or set the clock back to number 1 with a re-entry. All on his 1-year Extension of Stay

you normally never do a 90 day report on this visa, because you have to leave and re-enter Thailand every 90 days to keep this visa alive, and each entry sets your report-due date back to number one, again

however, the part I do not understand is, a 1-year Multi Entry Non-Imm O based on retirement needs you to do a border run before 90 days have passed, in order to receive a new 90-day admission of stay. To my knowledge you cannot get a 90-day extension on an immigration office in side Thailand. Did you do a border run or did you submit your passport an an immigration office?

so you got an "admission of stay" out of a Multi Entry Non-Imm-O visa based on retirement, which must be extended every 90 days, for another 90 days. This has nothinh to do with your 90-day report. The Report must be made 90 days after entering Thailand and each 90 days after a 90-day report on immigration. Both dates - the date of extension and the 90-day report due date, are only coincidentally close to each other

and a word about wording: One does not "renew" a visa. A visa cannot be "renewed". Only an admitted stay can be extended ("extension of permit of stay")

it seems you lost your departure card. It is needed when hotels want to register you per TM30 . . however if you have a copy of it, they can read the arrival/departure card number, so not a problem. About your 90-day report: You should have made it when you extended your Visa. The 90-days count only starts anew, if you leave and re-enter Thailand, or after the report. As long as you are inside Thailand, the 90-day clock is ticking and you must report at an Immigration minimum 10 days before and 7 days after the due date, every 90 days, after the report the clock is set back to number one, again

okay, if you already have a return ticket within the 60 days ( 30 plus 30) then you should ask your airline if they OK an onward ticket issued within the second 30 days period