What are the rules and costs for overstaying a Thai visa if I'm crossing to Laos?

If your visa expires while you are at the Thailand-Laos border, you will incur a fine for overstaying your visa. The fine is 500 baht for each day of overstay, which can be paid on the Thai side of the border. There is typically little issue if you are only one day over; you are likely to just pay the fine and receive a stamp in your passport. However, it is advised to proceed directly to the border to avoid complications.