For reference, Arizona, California, Florida, Massachusetts, Nevada, New Hampshire, New York, South Dakota, Tennessee, Texas, Washington State and Wyoming are participating.
For those who don't know, of those 12 states, only 4 actually have income taxes. The other 8 do not. This whole system stinks. The overly complicated tax code, the sleazy corporations making tons of money on it, the entrenched politicians and bureacrats who make a living on it, etc.
> Most of those states don’t tax income at the state level, but the four that do...will guide participants to a state-supported tool that they can use to submit their state returns.
Which means it's _more_ incomplete in states with income tax (federal return through IRS pilot, state return through a state system) than in states without income tax (just federal IRS pilot return).