When I input Form 1099-INT in turbotax, there is no place to input box 4 tax withholding. Where do I do this.

[mhorsley]

I voluntarily withhold taxes on interest income but I saw no way to input when I report the interest in turbotax.

[MinhT1]

In TurboTax, after you have entered the interest received in box 1, check the box My form has info in other boxes (this is uncommon) before hitting Continue.

TurboTax will display more boxes and you can enter the Federal tax withheld in box 4.

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[Critter-3]

Yes ... always make sure to read the entire screen ...