[emodendroket]

I'd guess by taking your salary and determining if it was around $66k or less.

[ebikelaw]

AGI is net of deductions though, hence the "adjusted". AGI is literally the bottom line on form 1040. You can't just figure it in your head.

[emodendroket]

The US median income is well under $66k, making this is a moot point for more than half of filers. If you're on the cusp and trying to guess take the standard deduction.