If you are a sole proprietor, you should have included a Schedule C, business income and expenses, with your original 1040 return.
Therefore, if you have received your refund or paid your tax due, you should amend your return to include your Schedule C.
See Do I Need To Amend My Return?
If you are a sole proprietor, you should have included a Schedule C, business income and expenses, with your original 1040 return.
Therefore, if you have received your refund or paid your tax due, you should amend your return to include your Schedule C.
See Do I Need To Amend My Return?
OK then assuming you did not file a Schedule C with your original return, you will want to amend per the above before April 17, 2018..