Probably not. If you did in fact enter your W-2 contributions twice, then you probably did not over contribute so there would be no excess to withdrawal. In this case, there would be no change on your 2020 tax return. But, to be sure, prepare an amendment that removes the erroneous contributions you reported. As long as there is no net change, you can cancel the amendment and return next year. The 2020 amendment won't be ready until 03/25, so come back after that and start an amendment to confirm nothing was changed by updating your contributions. @Lilcrayons
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