With a graduated tax system, this very common concern doesn't really apply.
Your first 46k in income will be taxed exactly as it was taxed last year. Same %. Some of the income above that may be taxed at a higher rate, but you will still come out far better off than you were last year.
These are totally made up numbers, but the system works like this
First $10k of income, no taxes. Total tax bill is zero. You keep all 10,000 if that is all you made.
Second 10k of income, 10%. So the first 10k cost you nothing, and the second cost you $1k. So is you make $20,000 your tax bill is $1k and you keep $19,000
Third 10k of income, 12%. So the first cost nothing, the second cost 1k, and the third cost $1200, so your total bill is $2200 and you keep $27,800.
As you can see, making more is always better and the first $x of your income is always taxed at the same rate, no matter how many more Xes above that you make. This varies with deductions and other complications, but the basic system works that way for everyone.
If you want to make a donation, by all means, do so, but it isn't going to make you richer.