1. You did not timely file your original return. You have until April 15, 2021. The IRS says at Amended Returns & Form 1040X | Internal Revenue Service
Oct 14, 2020 — Generally, for a credit or refund, you must file Form 1040-X within 3 years after the date you timely filed your original return or within 2 years after the date you paid the tax.
2. Yes, you can claim a refund for all that you overpaid. Enjoy!
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