The link that Bsch4477 provided shows the IRMAA brackets for 2024. It has also not been updated to show the 2025 IRMAA brackets that are now fully determined, so it is an outdated reference.
Your 2024 MAGI for the purpose affects your 2026 IRMAA and the IRMAA brackets for 2026 will not be known for certain until September 2025. The following link provides guesses for the 2026 IRMAA brackets and gets updated every month when the CPI for the previous month is announced:
https://thefinancebuff.com/medicare-irmaa-income-brackets.html#htoc-2026-irmaa-brackets
