To determine how much income tax you have to pay, you will need to calculate your taxable income. Taxable income is your total income from all sources, minus any deductions and exemptions that you are eligible for. The first step in calculating your taxable income is to gather all of the relevant documents, such as your W-2 forms from your employer, 1099 forms for any other income you received, and records of any expenses you incurred that you plan to deduct.

Next, you will need to use the information from these documents to fill out the appropriate tax forms. For most individuals, this will be the Form 1040. The Form 1040 is used to report your income, deductions, and exemptions.
Once you have filled out the Form 1040, you will use the information on the form to calculate your taxable income. Taxable income is the amount of income that is subject to income tax. To calculate your taxable income, you will start with your total income, and then subtract any deductions and exemptions that you are eligible for.
After you have calculated your taxable income, you will use the information on the Form 1040 to determine the amount of income tax you owe. You can use the tax tables provided by the IRS to determine the amount of tax you owe, or you can use tax software or a tax professional to help you calculate your tax liability.
In summary, to determine how much income tax you have to pay, you will need to calculate your taxable income. This is done by gathering all relevant documents, filling out the appropriate tax forms, subtracting any deductions and exemptions that you are eligible for, and then using the tax tables or software to determine the amount of tax you owe. It’s also advisable to consult a tax professional for accurate calculation and guidance.