Once signed up and logged in you will need to create a Capital Gains account. Since Washington does not have an income tax, no state return is required unless your longterm capital gains exceed the annual limit.Washington Healthplanfinder verifies that the income you report is correct. We use data from Social Security and other federal agencies to do this. If you have a brokerage account (e.g. Accounting Manual for. The Charles Schwab Corporation provides a full range of brokerage, banking and financial advisory services through its operating subsidiaries. The amount of tax is based on what taxpayers report as their net longterm capital gain for federal income tax purposes, with adjustments.