Can you give me an example that illustrates this?
C - D - T = Z where C is gross income, D is allowed deductions, special deductions, and NOL carrying, T is tax and Z is after tax profit.
Before a tax increase Borean favorite Schlongs R Us' tax return is as such:
C = 1,000,000
D = 375,000
T = 212,500 (I did this computation in my head, if it's wrong

.)
Z = 412,500
After a tax increase of 34% to 37% in the tax bracket Schlongs R Us resided in for the prior example (but not for any lower brackets), and assuming C and D remain constant (I know this is asinine), the company's tax return would be as such in the following year:
C = 1,000,000
D = 375,000
T = 221,200 (Again,

if my math is wrong.)
Z = 403,800
If owner(s) care about returning Z from 403,800 to something close to 412,500 again*, they have to alter the figures that comprise C and D and increase their taxable income so that Z = Z again as these are the only variables under their immediate control** in a tax year.
To increase their taxable income, either C needs to increase or D needs to decrease. (Decreasing costs increases profit.

)
D (specifically, allowed deductions) are more under the immediate control of owner(s) than C which (generally speaking) requires another party to voluntarily exchange (what will become) income for goods and / or services.
spoiler (click to show/hide)
While reviewing ways to lower D, owner(s) might decide to cut their cost of labor. Besides overworking employees by laying off some productive ones because they have to work or die, in a business there are usually a few family members with no-show jobs that can easily get the boot without affecting the production process to keep C constant. (i.e. They aren't
really variable costs.) Though I imagine in the latter scenario the next family holiday will a bit awkward when Cousin Bradley shows up.
So let's say the owner(s) of Schlongs R Us decide to go ahead and lay off Cousin Bradley on 12/31 of the prior year who makes 14,500 a year at their no-show job in response to some Obammunist corporate tax rate increase. How would their next tax return look instead of how it did in the second calculation?
C = 1,000,000
D = 360,500
T = 226,565
Z = 412,935
412,500 ≈ 412,935
*In my experience, owner(s) care more about paying T at all than they do about Z.
**Insert

rant about the dictatorship of the bourgeoisie here.
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More like

rant amirite fellas.