Forms 1040-ES are used to pay estimated taxes for next year and are not related to your tax refund. TurboTax calculates the amounts on these forms based on your tax situation for the current year, projected for the coming tax year. Using those forms is totally optional. If you believe you will pay enough taxes through withholding on your income, there is no reason to pay estimated taxes.
If you want to see how these amounts were calculated, look for the Estimated Taxes and Form W-4 Worksheet, a TurboTax form included in your complete return (not an IRS form). Follow the instructions here and check the box for all forms and worksheets: How do I get a PDF of my return?
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