And, as a final nit-picky point..
IF your "Taxable" income (line 43 of the form 1040) is between $3000 and $99,999 for ordinary income, and if the special situations commented above don't apply....then you have to remember that tax tables are used. And those tax tables only change your taxes owed for every $50 change in your taxable income ( for any line 43 amounts $3000-to-$99,999). So once you find the exact $1 point at which your taxes due (or refund) changes, then another $49 of deductions don't change anything...while $51 will. Once you get above $100k of taxable income, then exact % values are used.
(Below $3,000 of taxable income, the jumps occur at $15 or $25 income points...at least during 2015 they were).
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
