Does early submission of the 90-day report in Thailand affect the due date for the next reporting?

Is that a problem ? Not really ..

Just to let you know for 90 day reporting in Jomtien you do not physically have to go into the immigration building. You just go to the desk outside on your right as you enter through the gate. Drop your passport and forms etc off and go back an hour or 2 later. No waiting around.

Its logical. You report every 90 days. If you report early the count resets.

Correct

𝗦𝗼 𝗯𝘆 𝗱𝗼𝗶𝗻𝗴 𝘁𝗵𝗲 𝗿𝗲𝗽𝗼𝗿𝘁𝗶𝗻𝗴 𝗲𝗮𝗿𝗹𝘆, 𝗜 𝗲𝗻𝗱 𝘂𝗽 𝗺𝗼𝘃𝗶𝗻𝗴 𝘂𝗽 𝘁𝗵𝗲 𝗱𝗮𝘁𝗲 𝘂𝗽 𝗳𝗼𝗿 𝗺𝘆 𝗻𝗲𝘅𝘁 𝗿𝗲𝗽𝗼𝗿𝘁𝗶𝗻𝗴

you did indeed. the next 90 day report should be 90 days from the day they approve the one you just filed

𝘁𝗵𝗲𝗿𝗲𝗯𝘆 𝗰𝗮𝘂𝘀𝗶𝗻𝗴 𝗺𝗲 𝘁𝗼 𝗱𝗼 𝗺𝗼𝗿𝗲 𝟵𝟬 𝗱𝗮𝘆 𝗿𝗲𝗽𝗼𝗿𝘁𝗶𝗻𝗴𝘀 𝗱𝘂𝗿𝗶𝗻𝗴 𝘁𝗵𝗲 𝗰𝗼𝘂𝗿𝘀𝗲 𝗼𝗳 𝗺𝘆 𝗼𝗻𝗲 𝗼𝗿 𝘁𝘄𝗼 𝘆𝗲𝗮𝗿 𝘀𝘁𝗮𝘆 OMG, you filed ONLINE, you didn't go in person, please tell me the fact you MIGHT have to do one more 90 day report over the course of a year (because you file 2 weeks early each time) isn't a concern <- honestly as far as things to worry about here in the glorious "Land 'O Thaiz" I'd say having to file an extra 90 day report is pretty down on the list 😛

I knew an old guy who would wait and go file his 90 day report in person on the 6 or 7 day AFTER it was due because he was "gaining a week" each time

He was a day counter too 😛

Yes every report is 90 days after submission of the previous one

Good question. I have wondered the same thing.