I filed our 2023 taxes electronically using TurboTax. ,The return was accepted by the IRS and we received our refund. I have now discovered that I made a mistake when I entered the 1099-int we received from the Treasury Department for some Savings Bonds we redeemed. I entered the correct amount from Box 3 but I neglected to enter the tax withheld amount from Box 4. When I file the 1040x do I need to send a copy of the 1099? Or is a note saying that I did not enter the amount from Box 4 sufficient?
