Final answer:
The correct answer is October 15. Fiscal year taxpayers must file their tax returns by the 15th day of the fourth month after their fiscal year ends.
Step-by-step explanation:
Harry, being a fiscal year taxpayer with a fiscal year ending on June 30, must normally file his federal income tax return by October 15.
The general rule for fiscal year taxpayers is that they must file their tax returns by the 15th day of the fourth month following the end of their fiscal year. Since Harry's fiscal year ends on June 30, we count July as month one, August as month two, September as month three, and October as month four. Therefore, his federal income tax return would typically be due on October 15. This process is similar to the deadline for calendar year taxpayers, who are normally obligated to file by April 15, barring any extensions or unusual circumstances. If the taxpayer has paid more than what is owed, a tax refund may be issued by the government.