1 of this year (Tax. Code Section 22.01).Transaction date of Harris County Tax Office online payment portal; transaction date of telephone payment. Q. Where can I pay my property taxes? Which forms will I need to file? For Harris County Appraisal District, most businesses will need to file the general rendition form, 22.15. Ordinary income from depreciation. Disposition of depreciable property not used in trade or business. The due date for filing a property tax return with your county tax officials is January 1 and April 1 unless otherwise indicated. Get answers to frequently asked questions about capital gains, losses and the sale of your home.