You can think of the 1040 like a math worksheet: You plug in various numbers from a schedule (Form 1040 will tell you which one to use) and add the schedules' totals to your Form 1040. Form 1040 ...

Schedule 2 – Additional Taxes Covers nonrefundable and refundable credits not on Form 1040, like education credits, residential energy credits, or excess Social Security tax withheld.

Form 1040 is the main form that taxpayers use, but there are others, like Form 1040-SR, available (though not required) for taxpayers who are 65 and older. The 1040 tax form is the form taxpayers ...