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The state-tax savings for families investing 529 college savings plans depends very much on where you live.  The chart to the left shows the state-tax savings for a couple filing a joint 2011 return with $100,000 in taxable income and contributions of $2,500 each to two children’s in-state 529 savings plans.  For example, North Carolina’s benefit is in the mid-range at $388, but note that 16 states don’t offer any tax benefits!

[source: Wall Street Journal and Morningstar]