What is the process for extending a Digital Nomad Visa (DTV) in Chiang Mai, Thailand?

Sharing my successful DTV extension experience at Chiang Mai Immigration (Workaction category). Took 2 visits, but I was approved for the full 6-month extension. Yes, it was a lot of documentation to provide, but I'm happy with taking this route for the 1,900THB fee over funding a border bounce. I hope this information is helpful to somebody out there!

What I Submitted:

* Passport

* TM7

* Copy of passport bio page

* Copy of visa page in passport

* Copy of entry stamp in passport

* Copy of TM30 (printout from landlord)

* Copy of 90-day report (and had to show the original)

* Bank account verification letter

* 3 months of bank statements (originally provided 6 but the officer gave 3 back to me)

* Printout of the current bank account balance (printed from my bank's website)

* Job offer letter

* Employment verification letter

* Resume

* Portfolio

* Employment agreement

* Copy of Rental Lease

* 3 months of rent payment slips

* STM.2, STM.9, STM.11 (basic acknowledgment and consent forms on Thai visa/immigration laws. provided at the office, quick to fill and sign)

Final Thoughts:

* You can apply up to 45 days before your current stamp expires. Highly recommend using that window.

* Foreign bank accounts *are* accepted, but the officer required a bank verification letter (in addition to printed statements). My bank (U.S.-based) simply provided a letter with my name, account info, and balance. That seemed to do the trick.

* Didn't apply to me, but I was told that while we must show the equivalent of ฿500K held in the same account for 30+ days, shared accounts may be asked to show ฿1M

* One officer at this branch seemed to specialize in the DTV requests. He was helpful and professional, and openly acknowledged the inconsistency in how extensions are handled across Thailand.