Adjusted gross income-line 37 of the 1040-drives all manner of penalties, surtaxes and phaseouts of benefits. Noteworthy is an AGI-powered boost in Medicare premiums that will cost a couple up to $8,899 in 2017. Some states, like New York, kick up property taxes for people with high AGIs. The tax code is littered with assaults on your AGI. Some education or adoption credit or tax-deferred IRA will be dangled, then snatched away if line 37 is too high. This is how politicians can brag about promoting college or adoption or retirement yet trim the cost.
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