What are the rules regarding extension and re-entry for the DTV visa in Thailand?

1) No, the visa itself comes with the right to enter multiple times. You don't pay extra for that.

2) Extensions work once. A new entry will be 180 days again, and can be extended once again.

3) Current visas always grant you the entire period you're normally stamped in for, which is then also extendable, even if you enter on the last day of the visa validity. There's no reason to assume it works differently with this one. So you could get up to six years of stay from one DTV. However, bear in mind that in order to keep your last entry active, you need to work with re-entry permits in case you travel abroad.

Q1: No. Q2: No. Q3: 180 days.

#1 No

#2 No, you get 180 days with each entry, each extendable for 180 days if you want to. So you can either 180 days x10, or 180 + 180 x5, or a combination.

#3 You get to stay until 5 years and 5 months.

Which DTV-option are you going for?

The post right below yours answers all

If you are unable to fly somewhere for a week, you pay 10k baht to extent it

1) you don't pay for re-entry with a multiple entry visa

2) you can apply for and pay for one extension on each entry according to the infographic provided by the MFA

3) You will get 180 days every time you enter Thailand until the end date on your visa.