Whoa, those links made me feel way in over my head.
To answer your question about which calculations I am looking for when I do a simple google search, teh calculators I have found have been too simple. They don't factor in children (for credits) or allow you to enter business expense deductions (just profit and loss.) The main place our taxes seem to change when I am doing them is when I plug in our children (3) and our business expenses. We usually owe several thousand until I enter that information and then we get a refund. Since we are spending less (and saving more, but still not a ton), i just want to run the numbers to see if we need to set some aside. The one some have posted above seems so complicated I just immediately glazed over.
I'm just trying to get a rough estimate of where we are heading tax wise and that seems surprisingly hard to do.
In terms of the tax brackets, we are at the top end of 15% with a possibility for 25% in 2016 (freelance so hard to say until the fall.) For 2017, it is very likely we will be in the 25% bracket with some bigger clients already lined up. This year my goal is to max out our Roth Ira, but now I'm still confused about what is best based on the very interesting links above. We are self-employed and have never had a 401k for either of us. Matching sounds heavenly, but free schedules are a nice trade off.