On April 3, 2021, Luis filed his 2020 income tax return, which showed a tax due of $75,000. On June 1, 2023, he filed an amended return for 2020 that showed an additional tax of $10,000. Luis paid the additional amount. On May 18, 2024, Luis filed a claim for a 2020 refund of $25,000.

a. If Luis’s claim for a refund is correct in amount, how much tax will he recover?

b. What is the period that government-paid interest runs with respect to Luis’s claim for a refund?

c. How would you have advised him differently?