It depends on your status, and how you track your expenses and income.  If you have an accounting system, create a year end statement for your business and get all the forms from 2017 together(W-2's, W-9's, 1099 forms, anything that was sent to you during the prior year that is tax related.) If you don't have an accounting program, gather all your bank statements from Jan. 1st through Dec. 31st for 2017 along with your tax forms. Make an appointment with a tax professional and they will produce your taxes.  There will be penalties for filing this late, but payment can be negotiated with the IRS and state agencies.