No, it is too late to contribute to your Health Savings Account (HSA) account for 2024. You have to be enrolled in High Deductible Health Plan in order to make contributions (HDHP) to an HSA account. You can still own an HSA account; you just can't contribute without the HDHP.
There’s an annual limit to how much money you and your employer can add to your HSA. Read this article to learn more about excess contributions. HSA contributions made by you and your employer are in box 12 of your W-2 with the code W. Don't enter the contributions on your W-2, again, when you go through the HSA interview.
If you have an HSA, you may use these tax forms:
What is a health savings account (HSA)?