Can I add the money I made off the books ?

You are supposed to enter ALL of your income including any earnings you received that were "off the books."  If you had income earned as an independent contractor you need to enter it and pay self-employment income.

 

 

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/00/26653

 

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/