It sounds like you need to prepare a new W-4 for your employer so that more federal tax is withheld from your paychecks.
https://www.irs.gov/individuals/tax-withholding-estimator
https://www.irs.gov/pub/irs-pdf/fw4.pdf
Also....you are posting your question from Home and Business----if you have self-employment income you are required to pay self-employment tax for Social Security and Medicare. Have you been making estimated quarterly payments?
**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.**
