HSA contribution for 2024 tax year in 2025

[taxingtaxi]

My understanding is that I have until the tax filing deadline (Apr 15, 2025) to make HSA contributions for 2024. However, I'm only on a health plan with HSA/HDHP until December 31st, 2024. 

Will I have any penalties or excess contribution if I make an HSA contribution in Feb 2025 but designate it for 2024 tax year? 

[Opus 17 · Accepted solution]

What counts is your total eligible contribution limit, not when they are made.  For example, if you are covered by a single HD HP and you are under age 55, your limit is $4150 for 2024. You can contribute up to $4150 for tax year 2024, even if some of those contributions are made in 2025 (as long as they are properly designated for 2024).