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If you disagree with the appraisal district's value or any action of the appraisal district about your property, you may file a protest with the appraisal review board (ARB). In most cases, you have until May 31 or 30 days from the date the appraisal district notice is delivered - whichever date is later. You will need to act fast and get this filed.
Most appraisal district offices will meet with you informally to review your protest to try to solve problems.
Contact your tax office and advise them that you wish to protest the appraisal. They will then tell you if your county follows the informal procedure or if you will need to formally file the protest.