please help my friend, she is from Uzbekistan, overstay in thailand more than 5 months, age about 50 years old. could you please advise how much she should pay the penalty of overstay and where she should pay for it??

500 Baht a day.

Maximum fine of 20,000 Baht. Arrest and deportation if found out before you report voluntary.

Edited October 19, 200817 yr by Lite Beer

She will have to pay 20,000 baht which is the maximum penalty. It is 500 baht per day.

Most payments are made upon departure from the country.

It can be paid at immigration but that requires paying an additional 1900 baht for a seven day extension that will give her time to depart the country.

500 Baht a day.

Maximum fine of 20,000 Baht. Arrest and deportation if found out before you report voluntary.

Where do you pay the fine at the BKK airport? Can I check in for my flight and pay when I go through immigration?

You pay when you go through immigration