You would have to have a refund to purchase I bonds as part of your tax return and you would purchase them using your refund. You could make a payment towards your 2021 federal income tax to create a refund by using this link:
Pay IRS
Then, enter the payment as an estimated tax in TurboTax by going to Deductions and Credits section, then Estimates and Other Taxes Paid, then Estimates. This will create a refund you can use to purchase your I bonds.
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