They currently keep it because it's theirs to keep. I don't seriously think we're going to have states trying to hijack federal taxes. The feds will still have enforcement teeth with a NST. They might have to bite a state employee here and there, but it would work fine.
HA, ha, ha! My sides are hurting from laughing at your naivete.
The feds will still have enforcement teeth with a NST.
You will bring back the IRS to enforce this?