They are taxable and were included in your total income. That is right. But if you had tax withholding taken out of your other income you might not owe any more for the retirement withdrawals. And you get a Standard Deduction of 12,400 for Single or 24,800 Joint (1040 line 12) off your total income before you pay taxes.
So what is the Taxable Income on line 15? Then the tax on all your income is on line 16. Then check the rest of your return for withholding on line 25 and any credits you qualify for like the EIC on line 27.
