Notice about my unemployment benefits and my tax return, but still haven't gotten my federal turn.

It's possible that the unemployment exclusion could be the reason for your delay.  

The good news is the first round of Unemployment Calculation Exclusion (UCE) has been completed and went out to about 21,000 filers.

The bill makes the first $10,200 of federal unemployment income ($20,400 for married filing jointly) tax-free for households with income less than $150,000. The legislation excludes only 2020 federal unemployment benefits from taxes, not unemployment income received in 2021.

If you already filed your 2020 tax return, you do not need to do anything to get these additional unemployment benefits. The IRS announced that they will automatically adjust your return and send any additional refund amount directly to you. However, some people may now be newly eligible for additional deductions and credits not already included on the original tax return. In these cases, you will likely want to amend your return to claim these additional dollars. Additional information on this is below.

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Where's My Tax Refund? How to Check Your Refund Status ...