That is where I was trying to steer the discussion. That is something we often hear.
Unless we're on the wrong side of the Laffer curve, they would not be fully self-financing. On the contrary, it would be very partial. It would result in a loss of revenue for the federal government at a time when it wants to invest in infrastructure. I don't think you can actually say they would be fully self-financing.
Tax cuts don't pay for themselves entirely.
Only a portion would be offset by the economic growth generated by the reduction.