Query: How to calculate my estimated taxes. 1099 MISC + Self Employment

Relevant passages:
 <=SEP=> There is a shortcut you can use when calculating federal estimated taxes.  Some states may allow the same type of estimation, but I know at least one (my own--Illinois) that does not. The shortcut: you can completely base your estimated taxes for this year on last year's tax return and avoid any underpayment penalty.  A quick summary can be found here (emphasis mine): If your prior year Adjusted Gross Income was $150,000 or less, then   you can avoid a penalty if you pay either 90 percent of this year's   income tax liability or 100 percent of your income tax liability from   last year (dividing what you paid last year into four quarterly   payments). This rule helps if you have a big spike in income one year,   say, because you sell an investment for a huge gain or win the   lottery. If wage withholding for the year equals the amount of tax you   owed in the previous year, then you wouldn't need to pay estimated   taxes, no matter how much extra tax you owe on your windfall. Note that this does not mean you will not owe money when you file your return next April; this shortcut ensures that you pay at least the minimum allowed to avoid penalty. You can see this for yourself by filling out the worksheet on form 1040ES.  Line 14a is what your expected tax this year will be, based on your estimated income.  Line 14b is your total tax from last year, possibly with some other modifications.  Line 14c then asks you to take the lesser of the two numbers.  So even if your expected tax this year is one million dollars, you can still base your estimated payments on last year's tax.

 <=SEP=> This is wrong.  It should be  or  Now, to get back to self-employment tax.  Self-employment tax is weird.  It's a business tax.  From the IRS perspective, any self-employed person is a business.  So, take your income X and divide by 1.0765 (6.2% Social Security and 1.45% Medicare).  This gives your personal income.  Now, to calculate the tax that you have to pay, multiply that by .153 (since you have to pay both the worker and employer shares of the tax).   So new calculation  or they actually let you do  which is better for you (smaller).   And your other calculations change apace.   And like I said, you can simplify Q1se to  and your payment would be  Now, to get to the second quarter.  Like I said, I'd calculate the income through the second quarter.  So recalculate A based on your new numbers and use that to calculate Q2i.   or  Note that this includes income from both the first and second quarters.  We'll reduce to just the second quarter later.  This also has you paying for all of June even though you may not have been paid when you make the withholding payment.  That's what they want you to do.   But we aren't done yet.  Your actual payment should be  or  Because Q2ft and Q2se are what you owe for the year so far.  Q1ft + Q1se is what you've already paid.  So you subtract those from what you need to pay in the second quarter.  In future quarters, this would be  All that said, don't stress about it.  As a practical matter, so long as you don't owe $1000 or more when you file your actual tax return, they aren't going to care.  So just make sure that your total payments match by the payment you make January 15th.   I'm not going to try to calculate for the state.  For one thing, I don't know if your state uses Q1i or Q1pi as its base.  Different states may have different rules on that.  If you can't figure it out, just use Q1i, as that's the bigger one.  Fix it when you file your annual return.  The difference in withholding is going to be relatively small anyway, less than 1% of your income.

 <=SEP=> "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."

 <=SEP=> "One way to do these sorts of calculations is to use the spreadsheet version of IRS form 1040 available here.  This is provided by a private individual and is not an official IRS tool, but in practice it is usually accurate enough for these purposes.  You may have to spend some time figuring out where to enter the info.  However, if you enter your self-employment income on Schedule C, this spreadsheet will calculate the self-employment tax as well as the income tax.  An advantage is that it is the full 1040, so you can also select the standard deduction and the number of exemptions you are entitled to, enter ordinary W-2 income, even capital gains, etc. Of course you can also make use of other tax software to do this, but in my experience the ""Excel 1040"" is more convenient, as most websites and tax-prep software tend to be structured in a linear fashion and are more cumbersome to update in an ad-hoc way for purposes like tax estimation.  You can do whatever works for you, but I would recommend taking a look at the Excel 1040.  It is a surprisingly useful tool."