When state tax is entered into Asset Flow, the calculator assesses a tax on Social Security. This tax is based on the benefit amount that is subjected to tax on the Federal Side. If you don’t want this to occur, leave out the state tax rate.
Currently, the calculator adds the state tax to anything that is also taxed federally (after those federal deductions). Then there is an offset for the tax paid. This offset is taken off of the Federal Income Tax Basis, up to the SALT limits ($10,000).