The lawmakers in Wisconsin voted [arstechnica.com]in favor [reuters.com] of an incentives package worth up to $3B for Foxconn. The total value of the package depends on the number of jobs that Foxconn creates in the state, so, effectively, the state is paying about $500,000 for each new job.
Most of the incentive is in the form of cash payments from the state to Foxconn, not just tax waivers. The cost to the residents of the state is about $1,200 per household.