> For example, in the US once you make over $75,000 (before most deductions), you no longer qualify for student loan interest payment deductions. For someone making $74,000 before who receives a $2000 bonus, they lose out on the deduction--potentially worth significantly more in tax-adjusted terms than the gross amount of the bonus before taxes.
The student loan interest deduction (and this is true of most -- AFAIK, actually all -- deductions with an income cap) doesn't have a sharp cutoff, it has a phaseout -- you get the full deduction up to $60,000, and it is reduced continuously with income down to zero at $75,000.
At $74,000, the maximum student loan interest deduction is a $167 deduction (which, at that income, is worth $42 in reduced tax liability.) Even with a $1,000 bonus that takes you just to the cutoff, its not possible for the loss of the deduction to be "worth significantly more in tax-adjusted terms than the gross amount of the bonus before taxes". [1]
[1] http://www.irs.gov/publications/p970/ch04.html#en_US_2013_pu...