First time resident alien via substantial presence test (SPT)

Hi, I've been trying to file my taxes and help my mom. Background:

  • Entry to US: Aug 1 2023
  • F-1 status termination: Dec 16 2024, no longer exempt individual for SPT
  • Mom entry to US: Dec 15 2023, never been an exempt individual for SPT
  • We both didn't leave US, we both don't have permanent residency.

Questions:

  1. Can my mom file as resident alien for full duration of 2024? Only file 1040?
  2. Can I file as NRA for full duration of 2024? Only file 1040-NR?
  3. Can I file as resident alien for full duration of 2025? Only file 1040?
  4. If 3, and my mom’s doesn’t have income, can I become Head of Household for 2025?

Essentially I am trying to avoid being dual-status individual if I can, because no tax filing software supports that and tax advisors costs a lot. I would also appreciate if anybody could point out a free/low cost place I could ask these questions.


Reference: https://www.irs.gov/publications/p519

> Residency starting date under substantial presence test. If you meet the substantial presence test for a calendar year, your residency starting date is generally the first day you are present in the United States during that calendar year.