most likely if you did a Roth conversion or other IRA distribution it's needed for the calculation on Form 8606 to determine how much was taxable (ratio of your basis to the total market value determines how much was non-taxable)
5498s are not generally mailed until May so you would use year-end statements to determine the value. Form 8606 instructions:
https://www.irs.gov/pub/irs-pdf/i8606.pdf
Line 6
Enter the total value of all your traditional, traditional SEP, and traditional SIMPLE IRAs as of December 31, 2024, plus any outstanding rollovers. A statement should be sent to you by January 31, 2025, showing the value of each IRA on December 31, 2024
