If you made contributions in 2025 that were intended to be contributions for 2025 but the IRA custodian treated them as contributions for 2024, evidenced by information on the 2024 Form 5498, they are 2024 contributions, not 2025 contributions. If by April 15, 2025 you filed your 2024 tax return or requested a filing extension, you have until October 15, 2025 to obtain a return of that mistaken 2024 contribution.
