Hi ,
Kids under 16 or 16 have to pay Overstay Fine at the immigration Airport ? which is usually for 16 above 20,000 Baht.
Thanks
TLDR : Answer Summary
In Thailand, children below the age of 15 do not incur overstay fines. Those aged 15 to 17 are subject to a daily fine of 500 Baht, with a maximum penalty of 20,000 Baht; however, they are not blacklisted for overstays. Once individuals turn 18, standard penalties apply, including potential blacklisting.