Does leaving Thailand reset my 90-day reporting requirement for my retirement visa?

If its the 5 year come and go vise then on a permanent stay you check in, if you leave and return that is your check in with immigration and should re start the 90 days, it's your length of stay in the country from point of entry when each 90 days starts and ends.

@Rj *****

what you call "retirement visa" probably is a "1-year Extension of Stay Permit" based on retirement, and NOT a "visa" at all. . . . . . . . . . so if you don't want to lose this one-year stay permit when exiting Thailand, you need to buy a single re-entry permit für 1000.- THB. You can buy it either at your Immigration or at the BKK airport in the section "Departure 2". The re-entry permit will keep your stay permit alive. When you return, you will be stamped in until the expiry date of the "Extension of Stay Permit". And the 90-days report clock starts over, beginning with the day you enter as day number one. Your old 90-days report slip (in case you still had that in your passport) becomes invalid

You need to get a re-entry permit from immigration or airport. If you don’t your retirement visa will be cancelled and you have to start again and apply for a new retirement visa.

yes but instead you need to do TM30

Correct 90 days starts again on the day you enter Thailand 🇹🇭

it's 90 consecutive days in the country not atotal

Yep. 90 days resets when you re-enter the Country

Leaving the country resets the date to 1. It's 90 days IN country reporting.