If you withhold at a rate of single 0, you'll get more withheld. Then, depending on how high your adjusted gross income is in the tax bracket, your overall tax pecentage will go up.
If I had an income of 72,000 I owe taxes of $13,006.25 or 18%
If I had an income of 42,000 I owe taxes of $5,506.25 or 13%
(just took one standard deduction for these numbers)
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