This bill introduces a new section to chapter 82.87 of the Revised Code of Washington, allowing taxpayers to prepay their capital gains taxes up to six months before the due date for filing and payment. Taxpayers must still adhere to the prescribed manner and form for these payments as determined by the department.

Additionally, the bill stipulates that if the department finds that a taxpayer has overpaid their taxes for the taxable year, no interest will be assessed for the period prior to the due date, provided the taxpayer is entitled to a remittance. This provision aims to alleviate the financial burden on taxpayers who may need to adjust their payments based on their actual tax liability.