Do you mean the Tax Computation Worksheet? That is a behind-the-scenes calculation in TurboTax and is not used for everyone, depending on the specific situations in your return. If you want to look at it for manual use, it's in the Instructions to Form 1040.
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf
What is the context for your question.? Often the tax calculation in TurboTax is not taken strictly from that worksheet. Some calculations involve the Qualified Dividends and Capital Gains Tax Worksheet, the IRS Tax Tables, and other calculations depending on the specific forms in your return.
You may first wish to see what methods TurboTax is using to calculate your tax. We can tell you how to find that out. Are you using Online TurboTax or desktop TurboTax?
