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How to calculate my estimated taxes. 1099 MISC + Self Employment
There are a couple of things that are missing from your estimate. In addition to your standard deduction, you also have a personal exemption of $4050.  So "D" in your calculation should be $6300 + $4050 = $10,350. As a self-employed individual, you need to pay both the employee and employer side of the Social Security and Medicare taxes.  Instead of 6.2% + 1.45%, you need to pay (6.2% + 1.45%) * 2 = 15.3% self-employment tax. In addition, there are some problems with your calculation. Q1i (Quarter 1 estimated income) should be your adjusted annual income divided by 4, not 3 (A/4). Likewise, you should estimate your quarterly tax by estimating your income for the whole year, then dividing by 4.  So Aft (Annual estimated federal tax) should be: Quarterly estimated federal tax would be: Qft = Aft / 4 Annual estimated self-employment tax is: Ase = 15.3% * A with the quarterly self-employment tax being one-fourth of that: Qse = Ase / 4 Self employment tax gets added on to your federal income tax.  So when you send in your quarterly payment using Form 1040-ES, you should send in Qft + Qse. The Form 1040-ES instructions (PDF) comes with the "2016 Estimated Tax Worksheet" that walks you through these calculations.