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If only SS and Medicare was taken out, then it would be 1450-111= 1339.

A lot depends on what your filing status is (single/married) and what your pay cycle is.  And even then, it may tak a couple pay cycles for Paroll to enact a change to a W-4.
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Check the tables starting on page 46 here to see what to expect for the income tax withholding portion

<a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-pdf/p15.pdf">https://www.irs.gov/pub/irs-pdf/p15.pdf</a>
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*