Where Do HSA Contributions Go on Form 1040? Line 13 and Form 8889

HSA contributions do not appear directly on Form 1040. You calculate the deduction on Form 8889, carry it to Schedule 1, Line 13 (Adjustments to Income), and the Schedule 1 total then flows to Form 1040, Line 10. That Line 10 figure is subtracted from your total income to produce the adjusted gross income on Line 11.¹²

The Path From Form 8889 to Form 1040

Three forms do the work, in this order.

Form 8889, Part I. This is where you figure the deduction itself. Part I walks through the months you were an eligible individual, your annual contribution limit, and the total contributions made for the year by you and your employer combined. The deductible figure lands on Form 8889, Line 13.³

Schedule 1, Line 13. The amount from Form 8889, Line 13 is entered on Schedule 1, Line 13, under the “Adjustments to Income” section.¹ Schedule 1 gathers every above-the-line deduction you qualify for: educator expenses, student loan interest, IRA contributions, your HSA deduction, and others. All of them are summed on Schedule 1, Line 26.

Form 1040, Line 10. The Schedule 1, Line 26 total is copied to Form 1040, Line 10. Line 10 is then subtracted from total income on Line 9 to produce adjusted gross income on Line 11.²

So if you are scanning Form 1040 for your HSA deduction, you will not find a dedicated line. It is folded into the adjustments total on Line 10.

Why It Sits as an Adjustment to Income

The HSA deduction is “above the line,” meaning it reduces adjusted gross income rather than being claimed as an itemized deduction. You get the benefit whether you take the standard deduction or itemize on Schedule A. That matters beyond the tax you owe on the deduction itself. A lower AGI can preserve eligibility for credits and deductions that phase out at higher income levels, including the premium tax credit and education credits.

What Your Employer’s Contributions Do

If your employer (or you, through a cafeteria-plan payroll deduction) contributed to your HSA, those amounts appear in Box 12 of your W-2 with Code W. They are already excluded from the wages shown in Box 1, so you do not deduct them again on Schedule 1. They are entered on Form 8889 only to count against your annual limit, which reduces the amount you can personally deduct.

Only contributions you made with after-tax dollars, outside of payroll, produce the deduction that moves through Schedule 1, Line 13 to Form 1040, Line 10.

The 2026 Contribution Limits That Govern Line 13

The number on Schedule 1, Line 13 cannot exceed your annual HSA contribution limit minus employer contributions. For 2026:⁴

Self-only HDHP coverage: $4,400
Family HDHP coverage: $8,750
Catch-up contribution if you are 55 or older: an additional $1,000⁵

To contribute at all, you need coverage under a high deductible health plan, you cannot be enrolled in any part of Medicare, and you cannot be claimed as a dependent on someone else’s return.⁶ For 2026, a qualifying HDHP must carry a minimum annual deductible of $1,700 (self-only) or $3,400 (family), with out-of-pocket costs capped at $8,500 (self-only) or $17,000 (family).⁷

You have until April 15, 2027 to make contributions for the 2026 tax year.

Full-Year Versus Partial-Year Coverage

If you had HDHP coverage all twelve months, your deductible amount is the lesser of what you contributed or your annual limit, less any employer contributions. If you were covered for only part of the year, your limit is prorated by the months you qualified.

One exception, called the last-month rule, lets you contribute the full annual limit if you had qualifying HDHP coverage on December 1. The condition: you must maintain HDHP coverage through December 31 of the following year. If you drop coverage early, the amount that would not have been allowed without the rule becomes taxable income and triggers a 10% additional tax.⁸

Where Distributions Go (Not Line 10)

Contributions and distributions use different parts of Form 8889 and land on different parts of your return, so it is worth separating them.

Distributions reported to you on Form 1099-SA are reconciled in Part II of Form 8889.⁹ Amounts spent on qualified medical expenses are tax-free and do not appear in income. Any portion not used for qualified medical expenses is taxable and flows to Schedule 1, Line 8f, not to the Line 10 adjustments section.¹

A nonqualified distribution also carries a 20% additional tax, calculated on Form 8889, Part II (Lines 17a and 17b), reported on Schedule 2, Line 17c, and ultimately included in Form 1040, Line 23.¹⁰ The 20% penalty does not apply if the distribution is made after you turn 65, after you become disabled, or after the account holder’s death.⁶

Quick Reference

Deduction calculated: Form 8889, Part I, Line 13
Deduction entered: Schedule 1, Line 13
Adjustments totaled: Schedule 1, Line 26
Total adjustments on main return: Form 1040, Line 10
Adjusted gross income: Form 1040, Line 11 (Line 9 minus Line 10)

If you contributed only through payroll with Code W amounts on your W-2, your Schedule 1, Line 13 figure may be zero even though Form 8889 still needs to be filed. The deduction has already been built into your taxable wages, and Form 8889 is what proves it to the IRS.

1
Internal Revenue Service. 2025 Instructions for Form 8889
2
Internal Revenue Service. Instructions for Form 1040 (2025)
3
Internal Revenue Service. About Form 8889, Health Savings Accounts (HSAs)
4
Internal Revenue Service. IRS Notice 2026-05, Expanded Availability of Health Savings Accounts Under the OBBBA
5
Office of the Law Revision Counsel. 26 USC 223 – Health Savings Accounts
6
Internal Revenue Service. Instructions for Form 8889 (2025)
7
Internal Revenue Service. Revenue Procedure 2025-19
8
Internal Revenue Service. Publication 969 (2025), Health Savings Accounts and Other Tax-Favored Health Plans
9
Internal Revenue Service. About Form 1099-SA, Distributions From an HSA, Archer MSA, or Medicare Advantage MSA
10
Internal Revenue Service. 2025 Schedule 2 (Form 1040)