Compare all the lines from 2018 & 2019. What line do you think is too much? The tax on line 12b or your tax due?
If you owe more this year or your refund is smaller,
One reason is the IRS changed the withholding tables so you got more in your checks during the year instead of a big refund. And there are other tax changes. And any dependents you have are a year older. If you made more income that can reduce some credits you got like the EIC.
