Line 9 is used to show both, employer and employee contributions made through payroll.
According to the IRS:
“Employer contributions (including employee payroll contributions through a cafeteria plan) include any amount an employer contributes to any HSA for you for 2023. Also, include contributions made by a health insurance plan on an employer's behalf. These contributions should be shown in box 12 of Form W-2 with code W. “
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