When you go to the HSA section in the "Deductions and Credits" section of your federal tax return you will need to enter how much was contributed. The amount from your W2 will be carried over and the additional contribution is entered just below that.
The next screen has three choices - select the third choice that you had "different coverage at different times of the year" and then when you get to the next screen you will enter your monthly coverage throughout 2025 and spread your contributions across that monthly limit.
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