Deductions & credits

Just two follow-up questions:

  1. I can only fill in past carryovers back to 2016, I have no access to the 2015 carryover figures. Is this a problem? My tax returns have always been accepted by the IRS with no regard to reporting inconsistencies in the foreign tax paid carryover in section 1116.
  2. It looks like I am going to have to amend only my returns of 2023 and 2024 to remedy (a) these historical foreign tax carryovers, but also (b) due to corrections to my foreign tax payments, for foreign income (passive income). Should I go ahead and file my 2025 return now and wait until it is accepted, then file the amended 2023, 2024 returns together? I will owe the IRS very small amounts (under $50) on each of those. (These will eventually affect my 2025 filing.) Or do I file first the amended 2023, wait for acceptance, then file the 2024 amended return? An amended 2023 is going to affect 2024 because of the revision to foreign income, then that will affect my 2025 return. Should I wait to file my 2025 return until these 2023 and 2024 revisions are done? Thanks so much!