What are the tax benefits to making an EITC-qualified gift? 

By utilizing the EITC program, it costs very little to donate a lot. This chart illustrates this highly leveraged way of giving.
Standard gift EITC gift
Contribution ($5,000) ($5,000)
PA state tax credit $0 $4,500
Federal deduction (assumes a 25% rate) $1,250 $125
 Out of pocket ($3,750) ($375)