@B_2025
Should we assume that you are US person ( citizen/GreenCard/Resident for tax purposes )?
How about your filing status -- Single / MFS/MFJ/HoH ?
The property that you sold -- was that you main residence while you were in the UK ? When did you sell ? When did you become a US person ? How did you recognize the sale of the property in the tax year ( US tax year )? Did UK tax you on gain of the property ? Did you claim Foreign Tax credit ?
Did you report FBAR / FATCA on the monies from the sale and held in the UK account that you own/operate ?
Generally, while exchange based losses are not recognized, gains may be taxable , depending on exact facts and circumstances.
I will circle back once I hear from you with the answers ( so I have an understanding of the situation/ antecedents etc. ).