Let me start off by saying that if you are self employed and haven't visited a CPA, you really need to go.
Now THAT'S out of the way, I found an awesome tool to help estimate quarterly employment taxes! It's extremely easy to use, and very user friendly. And it is a PERFECT habit to start out 2018!
Paying quarterly employment taxes will help you avoid a big fat tax bill come every April. No one wants to OWE taxes instead of getting a refund!
Check it out, and let me know what you think!