Cheng filed an amended return this year, claiming a refund relative to her tax computation on a prior-years return.
When the IRS approves the amended return and issues the refund, it also pays Cheng interest with respect to the overpayment.

Question

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When the IRS approves an amended return that results in a refund, they also pay interest on the overpayment from the original due date of the return or the date the tax was paid, whichever is later, until the date the refund is issued.

Cheng Filed an Amended Return This Year, Claiming a Refund