Final answer:
Justin, Tracy's sole heir, must file Form 1310 to claim a refund on Tracy's final tax return. Harriet is not required to file Form 1310 since Elaine's final return has a balance due, not a refund.
Step-by-step explanation:
The individual who must file Form 1310, Statement of Person Claiming Refund Due a Deceased Taxpayer, is determined by whether they are a surviving spouse or other individual legally entitled to the deceased person’s refund. In the case provided, Justin, who is the sole heir named in the will of his deceased roommate Tracy, would be required to file Form 1310 with Tracy's final tax return if he is claiming a refund. Harriet, on the other hand, is not required to file Form 1310 for her deceased sister Elaine as no refund is due because the final return has a balance due of $500.
It is important to note that if an individual was appointed by the court as the personal representative, they would not need to file Form 1310 to claim a refund on behalf of the deceased taxpayer. Instead, they would attach a copy of the court certificate showing the appointment.