The What-If 2021 tax rates are the rates for tax year 2021as defined by the current Tax Code.
There are many proposals being floated by the Congress, one being to increase the long term capital gains tax rate to 25% from the current 20% for asset sales after September 13, 2021. As with all proposals in Congress, changes to the tax code has to be approved by both houses and then signed into law by the President. Whether any of the proposed tax code changes ever become law is anyone's guess.
For TurboTax, any calculations are wholly dependent on the IRS interpretation of the tax code changes and will not be incorporated into the TurboTax software until written and approved by the IRS.
