You should receive a 1099-R form from the investment firm to show this withdrawal, even though it was a reversal of your original contribution. The investment firm is still required to send the 1099 and then it is up to you to report this as a reversal on your return.
You will enter the amount you withdrew on line 15a of Form 1040, but then on line 15b you will show only the taxable portion of that withdrawl, which may be zero. You need to complete Form 8606 to figure the amount, if any, which is subject to tax.
Please refer to page 24 of the following Form 1040 instructions for lines 15a and 15b on your tax return and you will see where it addresses the issues of IRA contributions which were returned to you and how to report them.
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