@Jonson702ER ,
(a) Was this your first entry in to the USA in 2024 ? How about prior two years ? Generally your residency start date is dictated by the passing of Substantial Presence Test and/or Green Card test.
(b) What type of pension --- public sourced or private sourced. Most treaties limit whom ( which country ) can tax the pension.
I will circle back when I hear from you -- yes ?