<prompt> Human: Income background:Married, No dependents, Filing Jointly.___My incomeW2 - 42225Fed withheld - 6147State withheld - 18371099-misc - 14680___Spouse incomeW2 - 80000Fed withheld - 13220State withheld - 4799___So using TaxCaster I inputted all my info EXCEPT my 1099. Result is I get a refund of 2373.Next I input my 1099. Result is -3112. My question is how did my refund drop 5485 37 after adding my 1099?? Putting just my 1099 in the calculator, it say I owe 1571 married and 2315 single, nowhere near that 5485.Any help?EDIT: Can someone please break down the math so I can properly estimate my taxes for 2016. This entire year Ill be 1099. Currently Ive been putting only 25 of my paychecks to the side.  <response>: Assuming you had no Ordinary and Necessary business expenses, the federal self employment tax liability on 14,860 is 2,100. This is in addition to your total income tax liability.You evidently made no Estimated Tax payments, nor did you adjust your federal withholding from your wages. 