I explained that. The tax is calculated a different way. There are over 7 ways to calculate the tax. It does use Schedule D even if it is not required for filing.
You can probably tell because the tax on 1040 will be less than the Tax Table
https://ttlc.intuit.com/community/forms/help/form-1040-line-11-amount-is-less-than-standard-irs-tax-...
