Clint Flint is self-employed and his only income for 2020 is from his personal business (sole proprietorship). His business is expanding rapidly and he expects his taxable income to be substantially higher for 2020 than previous years. He plans to file his 2020 tax return on June 15, 2021. The balance-due date by which any federal income tax payable must be paid without incurring interest costs is:

a.	September 15, 2021
	b.	March 15, 2021
	c.	None of the choices shown.
	d.	April 30, 2021
	e.	December 31, 2020
	f.	June 15, 2021