Boeing pays no state sales tax and received tax breaks worth between 2 and 3 billion dollars from the Washington State legislature. (See Huge tax breaks for aerospace didn’t deliver many new jobs.)
But The Seattle Times reports today: Washington worries as Boeing pours $1B into S.C. Partly the shift to South Carolina is in response to $120,000,000. Another reason is that workers in South Carolina are non-unionized.
See also Boeing ignores taxbreaks, ships jobs to South Carolina and Texas from 2011.