Yes, as long as you have not exceeded your Health Savings Account (HSA) contribution limit for the year, an additional after-tax contribution can impact your refund. It provides an additional deduction which reduces your taxable income.
You would enter this additional contribution in the Deductions and Credits > Medical > 1099-SA, HSA, MSA section of your return. Look for a question about making HSA contributions. Any amounts reported on your W-2 and made through payroll contributions will be shown on the screen along with a place to enter any additional contributions that you made outside of payroll contributions.
You can enter the amount you intend to contribute just to see if it impacts your return. Then decide whether you do want to make the contribution. You have until the due date of the tax return to actually make the HSA contribution and designate it for the 2025 tax year instead of 2026.
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