I am currently in Thailand and am going to Malaysia for a few days for a boarder run and holiday for a few days. Just wanting to know if I go and come back to Thailand, will I need to pay for the second stamp for 30 more days or they will just stamp and that’s fine for another 30 days?
TLDR : Answer Summary
If you are from a visa-exempt country, you will not need to pay for a second stamp upon returning to Thailand after your trip to Malaysia; you'll receive another 30-day stamp for free. You can extend this 30-day stamp for an additional fee of 1,900 baht while you are in Thailand.