Are you referring to your Self-Employment taxes? Those taxes are already entered on your tax return after completing all your self-employment income and expenses.
The SE taxes are calculated on Schedule SE.
The amount of SE taxes is entered on Schedule 2 Line 4. This amount from Schedule 2 flows to your Form 1040 Line 15. They are included in your taxes owed on Form 1040 Line 23. Or they have reduced your tax refund on Line 20.
