What do you mean by a "refund due?" If you are getting money back you get a refund. If you owe tax due, you have to pay by April 18, 2023. Better look at your Form 1040 and make sure....Refund is on line 35a; tax due is on line 37. It cannot be both.
https://www.irs.gov/filing/where-to-file-paper-tax-returns-with-or-without-a-payment
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