What this line means
Employer contributions to your HSA, including amounts you contributed through a cafeteria plan (salary reduction). This number comes from your W-2 Box 12 Code W. It includes both what your employer put in and what you contributed through payroll deduction. These amounts are already excluded from your W-2 Box 1 wages, so you do not deduct them again on this form. 1
Does this apply to you?
- Your employer contributed money to your HSA on your behalf
- You contributed to your HSA through payroll deduction (pre-tax salary reduction)
- Your W-2 shows an amount in Box 12 with Code W
- You participated in an employer-sponsored cafeteria plan that includes HSA contributions
Easy to overlook
Payroll-deducted contributions are employer contributions for tax purposes Your own payroll-deducted HSA contributions are lumped together with your employer’s contributions in W-2 Box 12 Code W. This confuses filers who think their payroll deductions should go on line 1. They do not. If the money came out of your paycheck before taxes, it is already excluded from income and belongs on line 2. 2 IRS Form 8889 instructions — Line 2
Multiple W-2s from different employers If you changed jobs during the year and both employers offered HSA contributions, add up the Box 12 Code W amounts from all your W-2s. The combined total from all employers goes on this single line. Missing a W-2 understates your employer contributions and can cause you to exceed the contribution limit without realizing it. 3 General filing pattern — double-deducting employer HSA contributions
Watch out for this
Do not try to deduct amounts shown in W-2 Box 12 Code W anywhere on your return. These contributions are already excluded from your taxable wages in Box 1. Claiming them again on line 1 of Form 8889 or on Schedule 1 creates a double deduction. The IRS compares your W-2 data to your Form 8889 and will flag the mismatch.
Footnotes
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IRS Form 8889 Instructions, Line 2. https://www.irs.gov/pub/irs-pdf/i8889.pdf ↩
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IRS Form 8889 Instructions, Line 2 — Employer Contributions. https://www.irs.gov/pub/irs-pdf/i8889.pdf ↩
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IRS Publication 969, Health Savings Accounts and Other Tax-Favored Health Plans. https://www.irs.gov/pub/irs-pdf/p969.pdf ↩