RCW 82A.04.510: Estimated tax payments.

(1) Each individual with an estimated tax under this chapter in excess of $5,000 that is required by the internal revenue code to make payment of estimated taxes must pay to the department on forms prescribed by the department the estimated taxes due under this chapter.

(2) The provisions of the internal revenue code relating to the determination of reporting periods and due dates of payments of estimated tax applies to the estimated tax payments due under this section.

(3) Estimated tax payments are not required under this section if the annualized estimated tax is less than $5,000. RCW 82.32.090 applies to underpayments of estimated tax.

(4) For purposes of this section, the annualized estimated tax is the taxpayer's projected tax liability for the tax year as computed pursuant to section 6654 of the internal revenue code and the regulations thereunder.

(5) The department shall adopt rules for making estimated tax payments under this section on wages, salaries, and other compensation subject to federal income tax withholding.

(6) Estimated payments are not required under this section before July 1, 2029.