If someone already used your dependent's SSN on a tax return then you will not be able to e-file this year. You will have to file by mail. Print, sign and date your return in ink, and mail it. The IRS will sort out the duplicate use of the dependent's SSN.
If you have a business---are you a sole proprietor?-- then you will need to use online Self-Employed or any version of the CD/download so that you can enter your business expenses on a Schedule C. You will be paying self-employment tax for Social Security and Medicare, as well as ordinary income tax. If you also have income from a W-2 job, that is fine, and you can also enter that income --- it all goes on the same Form 1040.
https://ttlc.intuit.com/questions/2926899-how-does-my-side-job-affect-my-taxes
https://ttlc.intuit.com/community/self-employed/help/how-do-i-report-income-from-self-employment/00/...
https://ttlc.intuit.com/community/self-employed/help/what-is-the-self-employment-tax/00/25922
https://ttlc.intuit.com/questions/2902389-why-am-i-paying-self-employment-tax
https://ttlc.intuit.com/questions/1901340-where-do-i-enter-schedule-c
https://ttlc.intuit.com/questions/3398950-what-self-employed-expenses-can-i-deduct
https://ttlc.intuit.com/questions/1901110-do-i-need-to-make-estimated-tax-payments-to-the-irs
https://turbotax.intuit.com/tax-tools/calculators/self-employed/
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
