NOTE: Your protest must be received or postmarked by your protest deadline. The typical deadline for filing a protest is May 15th (unless otherwise stated on your Notice of Appraised Value). If you are unable to file online before this deadline but you still wish to protest, you must mail or hand-deliver your written protest form or protest letter by the deadline. (Hand-delivered protests must be received by the end of the business day, or placed in our drop-box before midnight, on your deadline date; mailed protests must be postmarked by midnight on your deadline date.)