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