I double checked online and desktop, 12c is showing for me. 12a is for itemized or standard deduction while 12b is any charity if standard is taken. 12c should be showing as the addition of those 2 lines. You are saying the calculations are correct, just not the form. Maybe you have some data stuck. Try this:
- Log out of your return
- Try one or more of the following:
- Sign in using a different browser.
- Sign in using a different device.
- Log back into your return.
Related: Instructions for Form 1040 PDF
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