The fact that you are employed by an "non-profit" employer does not mean that YOUR income is not taxable. If you owe tax due it is likely because you did not have enough tax withheld from your paychecks. You might want to change the W-4's that you provide to both employers so that they withhold enough tax.
https://turbotax.intuit.com/tax-tools/calculators/w4/ https://www.irs.gov/individuals/tax-withholding-estimator
https://www.irs.gov/pub/irs-pdf/fw4.pdf
https://turbotax.intuit.com/tax-tips/tax-payments/video-why-would-i-owe-federal-taxes/L3VXudPiN
**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.**
