It’s a good idea to send anything to the IRS by certified mail with return receipt so you have proof of delivery.
The IRS says it’s taking longer to process mailed documents due to COVID-19 mail processing
delays. Mail in being processed in the order received. Do not file a duplicate tax return.
The IRS says it will have refund information for mailed returns in 4 weeks on Where’s My Refund.
The IRS will use 2019 information if it does not have 2020 information when it comes time to send your third stimulus payment.
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