Get your taxes done using TurboTax

That can happen.   I once added $6 in interest and the tax went up $12! It pushed me into the next tax bracket. I was right at the line.  Look up your taxable income in the tables and see how the tax jumps.

https://www.irs.gov/pub/irs-pdf/i1040tt.pdf 

 

And adding more income can reduce some credits you may qualify for.  Many things can change.