Please be patient...I'm still learning 
It has never occurred to me that I could reduce the tax bracket I'm in by contributing more to my 401K, or otherwise reducing my taxable income. (I've understood that doing so reduces your taxable income but never realized that I should find other ways to do so for the purpose of staying in a lower tax bracket). So, I'm trying to strategically think through this to see if it's possible to get in the 15% bracket.
Dh has made the excel spreadsheet & now we just need to fill it with numbers. What "things" reduce our taxable income & thus dictate our tax bracket? 401K, mortgage interest, 529 contributions....what else? What other data should I be gathering to figure out what my taxable income is & how I can reduce it?
Is it literally dollar for dollar (If I'm contributing 10K into my 401K per year, does that reduce my taxable income by exactly 10K?) in every category?
Also, we have 1 child and we adopted him so we will be able to claim the federal adoption tax credit next year. Does that 'credit' work like a deduction to reduce our taxable income?
What other things should I consider while trying to do this?

It has never occurred to me that I could reduce the tax bracket I'm in by contributing more to my 401K, or otherwise reducing my taxable income. (I've understood that doing so reduces your taxable income but never realized that I should find other ways to do so for the purpose of staying in a lower tax bracket). So, I'm trying to strategically think through this to see if it's possible to get in the 15% bracket.
Dh has made the excel spreadsheet & now we just need to fill it with numbers. What "things" reduce our taxable income & thus dictate our tax bracket? 401K, mortgage interest, 529 contributions....what else? What other data should I be gathering to figure out what my taxable income is & how I can reduce it?
Is it literally dollar for dollar (If I'm contributing 10K into my 401K per year, does that reduce my taxable income by exactly 10K?) in every category?
Also, we have 1 child and we adopted him so we will be able to claim the federal adoption tax credit next year. Does that 'credit' work like a deduction to reduce our taxable income?
What other things should I consider while trying to do this?

all sorts of things! here's a list of a umm... few:
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