I work a full time job as well as a contract job. My full time job is my main source of income and my contract job is just to supplement. What form do I use to file?

[HelenC12]

You'll need to file Form 1040 which includes Schedule C, Profit or Loss From Business. TurboTax Premium covers self-employment and investments including stocks, bonds, ESPP's, crypto, and rental property income. 

[VolvoGirl]

To report your self employment income you will fill out schedule C in your personal 1040 tax return and pay SE self employment Tax. You can fill out Schedule C and enter Self Employment Income into Online Deluxe or Premier but if you have any expenses you will have to upgrade to the Self Employed version. Or buy any of the Desktop programs. All the Desktop programs have all the same forms, but you will get the most help in the Home & Business version.

How to enter income from Self Employment
https://ttlc.intuit.com/community/self-employed/help/how-do-i-report-income-from-self-employment/00/...