AZ SB1099

Increases the annual total tax liability threshold for required estimated tax payments in June, with thresholds rising incrementally from $1,000,000 in 2018 to $5,000,000 or more in 2023 and each year thereafter.

Modifies Section 42-5014 of Arizona Revised Statutes relating to transaction privilege tax (TPT) and affiliated excise tax return and payment requirements.

Allows taxpayers with liability below the applicable threshold to voluntarily elect to pay estimated tax payments under the same terms.

Estimated tax payment must equal either one-half of actual May tax liability or actual tax liability for the first fifteen days of June, credited against June tax liability.

Maintains existing delinquency rules distinguishing between electronic filers (due by last business day of June) and paper filers (due by business day preceding last business day of June).