There is no fee or charges of any kind for 90 day address reporting other then if you are late.
Put completed TM47 and photocopies, with a stamped self-addressed envelope, in a second envelope and post – [FONT=helvetica, arial, sans-serif]preferably registered post.[/FONT]
Send these documents to the following address:
Notify 90 Days Chiangmai Immigration 71 Sanambin Road T. Suthep A. Muang Chiang Mai 50200